CLINICAL STUDIES ON THE FOLLOWING INGREDIENTS:
Rapid enumeration of physiologically active bacteria in purified water used in the pharmaceutical manufacturing process
Physiologically active bacteria in purified water used in the manufacturing process of pharmaceutical products were enumerated in situ. Bacteria with growth potential were enumerated using the micro-colony technique and direct viable counting (DVC), followed by 24 h of incubation in 100-fold diluted SCDB (Soybean Casein Digest Broth) at 30 °C. Respiring and esterase-active bacteria were detected by fluorescent staining with 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) and 6-carboxyfluorescein diacetate (6CFDA), respectively. A large number of bacteria in purified water retained physiological activity, while most could not form colonies on conventional media. The techniques applied in this study enabled bacteria to be counted within 24 h so results could be available within one working day. These rapid and convenient techniques should be useful for the systematic monitoring of bacteria in water used for pharmaceutical manufacturing.
Metabolism of polyunsaturated fatty acids by skin epidermal enzymes: generation of antiinflammatory and antiproliferative metabolites
In the skin epidermis, the metabolism of polyunsaturated fatty acids (PUFAs) is highly active. Dietary deficiency of linoleic acid (LA), the major 18-carbon n−6 PUFA in normal epidermis, results in a characteristic scaly skin disorder and excessive epidermal water loss. Because of the inability of normal skin epidermis to desaturate LA to γ-linolenic acid, it is transformed by epidermal 15-lipoxygenase to mainly 13-hydroxyoctadecadienoic acid, which functionally exerts antiproliferative properties in the tissue. In contrast, compared with LA, arachidonic acid (AA) is a relatively minor 20-carbon n−6 PUFA in the skin and is metabolized via the cyclooxygenase pathway, predominantly to the prostaglandins E2, F2α, and D2. AA is also metabolized via the 15-lipoxygenase pathway, predominantly to 15-hydroxyeicosatetraenoic acid. At low concentrations, the prostaglandins function to modulate normal skin physiologic processes, whereas at high concentrations they induce inflammatory processes. PUFAs derived from other dietary oils are also transformed mainly into monohydroxy fatty acids. For instance, epidermal 15-lipoxygenase transforms dihomo-γ-linolenic acid (20:3n−6) to 15-hydroxyeicosatrienoic acid, eicosapentaenoic acid (20:5n−3) to 15-hydroxyeicosapentaenoic acid, and docosahexaenoic acid (22:6n−3) to 17-hydroxydocosahexaenoic acid, respectively. These monohydroxy acids exhibit antiinflammatory properties in vitro. Thus, supplementation of diets with appropriate purified vegetable oils, fish oil, or both may generate local cutaneous antiinflammatory and antiproliferative metabolites which could serve as less toxic in vivo monotherapies or as adjuncts to standard therapeutic regimens for the management of inflammatory skin disorders.
Ziboh, Vincent A., Craig C. Miller, and Yunhi Cho. “Metabolism of polyunsaturated fatty acids by skin epidermal enzymes: generation of antiinflammatory and antiproliferative metabolites.” The American journal of clinical nutrition 71.1 (2000): 361s-366s.
Skin and hair aerosol foam preparations containing an alkyl polyglycoside and vegetable oil
A water-based composition for the treatment of hair or skin containing an active-substance combination of cosmetic components consisting of
an alkyl polyglycoside corresponding to general formula (I):
in which R is an alkyl radical containing 6 to 22 carbon atoms, Z is a mono- or oligosaccharide and x is a number of 1.1 to 5, or adducts thereof with 1 to 10 moles of ethylene oxide or propylene oxide,
(b) a polymer, and
(c) a vegetable oil selected from kukui nut oil, almond oil, walnut oil, peach kernel oil, avocado oil, tea tree oil, soya oil, sesame oil, sunflower seed oil, tsubaki oil, evening primrose oil, rice bran oil, palm kernel oil, mango kernel oil, meadow foam oil, thistle oil, macadamia nut oil, grape seed oil, apricot kernel oil, babassu oil, olive oil, wheat germ oil, pumpkin seed oil, mallow oil, hazel nut oil, safflower oil, jojoba oil, canola oil, sasanqua oil and shea butter.
Mueller, Reinhard, et al. “Skin and hair aerosol foam preparations containing an alkyl polyglycoside and vegetable oil.” U.S. Patent No. 6,045,779. 4 Apr. 2000.
Dietary supplement for preventing or reducing shedding by animals
A dietary supplement for animals, comprising safflower oil, sunflower oil, olive oil, soya oil, cod liver oil, lecithin, natural flavors, herbs, garlic, and zinc. When fed to a dog or cat daily in a proper dosage, the supplement reduces or eliminates non-seasonal shedding and promotes healthy skin and a glossy, silky coat, without affecting the dog’s or cat’s natural shedding cycle and without causing any harmful effects. The composition also may be administered topically.
Allen, Barbara A. “Supplement containing safflower oil, sunflower oil, olive oil, soya oil, cod liver oil, lecithin, natural flavors, herbs, garlic and zinc.” U.S. Patent No. 5,965,153. 12 Oct. 1999.
On the demonstration of ω-3 essential-fatty-acid deficiency in humans
In the few reported cases of human ω-3 fatty acid deficiency, the clinical conditions described probably resulted from either combined ω-3 and ω-6 fatty acid deficiencies (leading to skin lesions) or from complications arising from special medical situations, such as long-term total parental nutrition with an ω-3-deficient fat preparation, such as safflower oil. These reports plus the experimental animal studies do call attention to the fact that those who devise enteral formula diets or parenteral fluids should always consider that both series of fatty acids (ω-6 and ω-3) must be included in the total diet as essential nutrients. This consideration is especially important if the feeding period is months or even years or if in the short-term continuous glucose infusion blocks the release of these essential fatty acids from adipose tissue stores. The deficient state, biochemically identifiable, can arise in a few days under the latter circumstance.
Anderson, Gregory, and William E. Connor. “On the demonstration of ω-3 essential-fatty-acid deficiency in humans.” American Journal of Clinical Nutrition 49.4 (1989): 585-587.
Hyrdrolyzed Collagen is a processed form of Collagen that is obtained by breaking down Collagen fibers utilizing heat or caustic solutions. It contains 20 different amino acids, including 8 of the 9 essential amino acids. Essential amino acids cannot be created the human body, which means that the only way our bodies can acquire them is through ingestion.(http://www.essen-nutrition.com/blog/entry/hydrolyzed-collagen-health-benefits)
Effects of a hydrolyzed collagen dressing on the healing of open wounds in dogs
Steven F. Swaim, DVM, MS Robert L. Gillette, DVM, MSE Eva A. Sartin, DVM, PhD Sherri H. Hinkle, BS Shindok L. Coolman, MS. American Journal of Veterinary Research. December 2000, Vol. 61, No. 12, Pages 1574-1578. doi: 10.2460/ajvr.2000.61.1574
Hydrolyzed collagen-based hydrogel with salt and pH-responsiveness properties
Pourjavadi, H. Salimi and M. Kurdtabar. Journal of Applied Polymer Science.Volume 106, Issue 4, pages 2371–2379, 15 November 2007. DOI: 10.1002/app.26682
The Effects of Acetic Acid on Collagen Cross-Links
Optimization of antioxidant activity by response surface methodology in hydrolysates of jellyfish (Rhopilema esculentum ) umbrella collagen
The influence of water, glycerin, paraffin oil and ethanol on skin mechanics.
Moisturizers and emollients do not only smooth the skin but also make it more supple. To clarify this effect, the short-term influence of tap water, paraffin oil, ethanol and glycerin on skin mechanics was studied. These substances are all common ingredients in moisturizers and emollients. Significant changes were seen already after 10 min of application. The distensibility and hysteresis (creep phenomenon) showed the most pronounced changes. Water and paraffin oil application caused significant (p < 0.03) increases after 10 min of application. The changes persisted for at least 10 min following paraffin oil application, while they disappeared sooner following water application. Application of ethanol had a negative effect on distensibility (p < 0.03). Glycerin appears to have a slow onset of action, but with the changes continuing even after application was stopped. The changes induced by glycerin appear to be similar to those induced by water and paraffin oil. The study shows that some of the most common ingredients in moisturizers and emollients are capable of inducing significant changes in the mechanical properties of human skin in vivo even after a 10-min application, suggesting that the outermost layers of the epidermis play an important role in skin mechanics.
Overgaard, Olsen L., and G. B. Jemec. “The influence of water, glycerin, paraffin oil and ethanol on skin mechanics.” Acta dermato-venereologica 73.6 (1993): 404-406.
Gravimetric analysis and differential scanning calorimetric studies on glycerin-induced skin hydration
A thermal gravimetric analysis (TGA) and a differential scanning calorimetry (DSC) were carried out to characterize the water property and an alteration of lipid phase transition of stratum corneum (SC) by glycerin. In addition, the relationship between steady state skin permeation rate and skin hydration in various concentrations of glycerin was investigated. Water vapor absorption-desorption was studied in the hairless mouse stratum corneum. Dry SC samples were exposed to different conc. of glycerin (0–50%) followed by exposure to dry air and the change in weight property was monitored over time by use of TGA. In DSC study, significant decrease in AH of the lipid transition in 10% glycerin and water treated sample: the heat of lipid transition of normal, water, 10% glycerin treated SC were 6.058, 4.412 and 4.316 mJ/mg, respectively. In 10% glycerin treated SCs, the Tc of water shifts around 129°C, corresponding to the weakly bound secondary water. In 40% glycerin treated SC, the Tc of water shifts to 144°C corresponding to strongly bound primary water. There was a good correlation between the hydration property of the skin and the steady state skin flux with the correlation coefficient (r2=0.94). As the hydration increased, the steady state flux increased. As glycerin concentration increased, hydration property decreased. High diffusivity induced by the hydration effect of glycerin and water could be the major contributing factor for the enhanced skin permeation of nicotinic acid (NA).
Lee, Ae-Ri Cho, and Hee Kyung Moon. “Gravimetric analysis and differential scanning calorimetric studies on glycerin-induced skin hydration.” Archives of pharmacal research 30.11 (2007): 1489-1495. DOI 10.1007/BF02977376
Plasticising effect of water and glycerin on human skin in vivo
Application of water and glycerin is known to influence skin mechanics. The kinetics of these processes are of great interest. A study was performed to show the immediate changes in skin-mechanics. A Dermaflex machine (R) was used to study 23 healthy volunteers. Water or glycerin was applied to the flexorside of the forearm, and readings were made after 3, 6, 9, 12 and 15 min. Regional untreated skin served as baseline. In agreement with earlier studies both substances influenced hysteresis. Water caused a significant increase in hysteresis after 12 and 15 min of hydration (P<0.01). Glycerin caused significantly increased hysteresis after 3 min (P<0.05) and the effect continued to the end of the observation period. No significant differences were seen in the distensibility. The onset of action is rapid for both substances, and the effects are therefore supposed to take place in the outermost layers of epidermis. The effect of glycerin on the hysteresis is more rapid in onset than that of water. Comparing the permeability coefficients, the effect on the mechanical properties of the skin does not appear to be determined by the permeability coefficients as water has a higher permeability coefficient but induces smaller changes than glycerin. Water alone does not appear to be the optimal plasticiser of human skin and other substances soluble in both water and lipids may have an even greater influence on skin mechanics in vivo.
Pedersen, L. K., and G. B. E. Jemec. “Plasticising effect of water and glycerin on human skin in vivo.” Journal of dermatological science 19.1 (1999): 48-52. DOI: http://dx.doi.org/10.1016/S0923-1811(98)00050-4
Method for reducing skin irritation associated with drug/penetration enhancer compositions
A composition and method for reducing the skin irritation properties of a transdermal drug/enhancer composition which comprises incorporating into said composition, either prior to or at the time of application the skin, an effective amount of glycerin. When incorporated into the drug/enhancer composition prior to application to the skin the glycerin content will be between about 0.1 and 70 wt. %, preferably between about 1.0 and 50 wt. % and most preferably between about 5.0 and 20 wt. % of the composition.
Patel, Dinesh C., and Charles D. Ebert. “Containing glycerin.” U.S. Patent No. 4,855,294. 8 Aug. 1989.
Effects of postmilking teat treatment on the colonization of Staphylococcus aureus on chapped teat skin.
Sixteen Holstein cows were used to test the effect of postmilking teat treatment on colonization and intramammary infection by Staphylococcus aureus on chapped teats. Treatments were (1) chapping the teat and using 1% I2/10% glycerin postdip solution, (2) 1% I2/10% glycerin postdip solution on nonchapped teats, (3) chapping the teat and using 10% glycerin postdip solution, (4) chapping the teat and not using a postdip solution. All mammary glands were free of S aureus teat skin colonization and intramammary infection at the start of the study. Teats selected for chapping were dipped in 1N NaOH prior to 3 applications of S aureus broth culture; cultures were applied at 12-hour intervals on all teats. Treatments were applied after each milking for 30 days and were initiated after the second broth dip. Teat skin swab specimens and milk samples were collected before treatment application. Teat skin condition was scored daily. Nonchapped teats (treatment 2) did not support skin or orifice colonization by S aureus. Treatment-1 teats healed most rapidly and supported less colonization in skin and orifice than did treatment-3 and -4 teats. Teat skin scores and skin colonization were lower for treatment-3 than treatment-4 teats. A correlation between teat skin colonization and teat skin conditions was found. Two intramammary infections were found in treatment-4 quarters and 1 in a treatment-3 quarter.
Fox, L. K., et al. “Effects of postmilking teat treatment on the colonization of Staphylococcus aureus on chapped teat skin.” American journal of veterinary research 52.6 (1991): 799-802.
Lipid vesicles containing avocado oil unsaponifiables
Disclosed are oil-filled paucilamellar lipid vesicles containing at least one non-phospholipid amphiphile as the primary lipid of the vesicle bilayers and avocado oil unsaponifiables. The vesicles are particularly useful for delivering dermatological, cosmetic and pharmaceutical formulations. A method of manufacture for these vesicles is also disclosed.
Mathur, Rajiv. “Lipid vesicles containing avocado oil unsaponifiables.” U.S. Patent No. 5,643,600. 1 Jul. 1997.
Microencapsulation of avocado oil by spray drying using whey protein and maltodextrin
Cold pressed avocado oil was microencapsulated by spray drying in four different wall systems consisting of whey protein isolate (WPI) alone or in combination with maltodextrin (MD) DE 5 at various ratios (90 : 10, 50 : 50 and 10 : 90). The WPI only or WPI/MD (90 : 10) powders were spherical and smooth, whereas the WPI/MD (50 : 50 and 10 : 90) powders exhibited pronounced surface collapse. Increasing the MD ratio resulted in higher bulk density and wettability, probably due to more compact physical structure and hydrophilic wall matrix. Surface free oil contents and microencapsulation efficiencies of powders were 11–16% and 45–66%, respectively, and no significant differences were observed between the samples. The crude avocado oil used in this study appeared to be stable against oxidation at cold and ambient temperatures, irrespective of microencapsulation. However, at high temperature of 60°C, the oxidative stability decreased significantly in all cases but it was improved to some extent by microencapsulation.
Bae, E. K., and S. J. Lee. “Microencapsulation of avocado oil by spray drying using whey protein and maltodextrin.” Journal of Microencapsulation 25.8 (2008): 549-560. DOI:10.1080/02652040802075682
Cosmetic oil and composition containing the same
A cosmetic oil comprises a mixture of at least jojoba oil, turnsole oil and a non-saponifiable fraction.
Koulbanis, Constantin, et al. “Jojoba oil, turnsole oil, and non-saponifiable fraction of a vegetable oil for skin.” U.S. Patent No. 4,324,802. 13 Apr. 1982.
Retinol skin care composition
A skin care composition to prevent premature photoaging of the skin of the user includes in addition to basic ingredients, in combination, retinol, a UV absorber and a moisturizer.
Katzev, Phillip K. “Retinol skin care composition.” U.S. Patent No. 5,002,760. 26 Mar. 1991.
Skin treatment preparation
A preparation for treatment of the skin to provide moisture thereto, to promote healing, to maintain a healthy condition; as well as to concurrently produce a pleasing cosmetic effect. The preparation comprises refined mineral oil, apricot kernel oil, avocado oil, aloe vera juice, together with vitamins provided by cod liver oil and preservatives.
Millard, Mary A. “Mineral oils, vegetable oils cod liver oil, propylparaben, butylat.” U.S. Patent No. 4,505,902. 19 Mar. 1985.
Potential reversal of chronological and photo-aging of the skin by topical application of natural substances
Aging changes in the skin, in which degenerative changes exceed regenerative changes, are characterized by thinning and wrinkling of the epidermis together with the appearance of lines, creases, crevices and furrows, especially accentuated in lines of facial expression. These changes are brought about both by chronological (genetically determined) and photo (solar radiation-determined) factors. The reason for the readily apparent surface morphological alterations is found in changes in the underlying dermis characterized by the loss of fascicular and soluble collagen and elastin fibres, with lessened support of epidermal layers, and lessened circulatory perfusion. Many so-called ‘antiaging’; actions of topically-applied materials are nothing more than transient hydrational/moisturizing effects, which, while lessening the prominence of undesirable surface defects and blemishes, do nothing to change the dermal losses. True ‘antiaging’ actions would require evidence for the return toward normal of the regenerative/degenerative balance exemplified by increased collagen and elastin synthesis. Evidence is accruing that four groups of topically applied substances, namely, (a) nonsaponifiable fractions of avocado and soybean oils, (b) vitamin A derivatives, (c) alpha-hydroxy acids (AHAs), and (d) extracts of Aloe vera, possess activities which reverse the degenerative skin changes seen with aging by stimulating the synthesis of collagen and elastin fibres, thereby restoring toward normal the regenerative/degenerative equilibrium.
Danhof, Ivan E. “Potential reversal of chronological and photo‐aging of the skin by topical application of natural substances.” Phytotherapy Research 7.7 (1993): S53-S56. DOI: 10.1002/ptr.2650070716
Instrumental and dermatologist evaluation of the effect of glycerine and urea on dry skin in atopic dermatitis
Background/aims: Moisturising creams are useful treatment adjuncts in inflammatory dermatoses and have beneficial effects in the treatment of dry, scaly skin. The effects on dryness and skin permeability of a new moisturising cream with 20% glycerine was compared with its placebo and with a medicinally authorised cream with 4% urea (combined with 4% sodium chloride) in the treatment of dry skin.
Conclusions: Moisturising creams are different, not only with respect to composition but also with respect to their influence on skin as a barrier to water in patients with atopic dermatitis.
Lodén,A.-C. Andersson,C. Andersson,T. Frödin, H. Öman and M. Lindberg. Skin Research and Technology. Volume 7, Issue 4, pages 209–213, November 2001. DOI: 10.1034/j.1600-0846.2001.70401.x
High incidence of contact dermatitis in leg-ulcer patients–implications for management
A retrospective review of patch test results from all new patients with venous leg ulcers was performed for the preceding 11 months. Eighty one patients referred from general practitioners and district nurses with venous stasis ulcers were included. Positive patch tests were found in 54 patients (67%), including a continued high incidence of allergy to lanolin and topical antibiotics. Multiple allergies were found in 48 patients (58%). In addition, a new problem of allergy to cetearyl alcohol, a constituent of commonly used creams and paste bandages, was identified in 13 patients. There is a continuing high incidence of contact sensitivity in patients with venous stasis ulcers which has important implications for the management of these patients.
Wilson, C. L., et al. “High incidence of contact dermatitis in leg‐ulcer patients–implications for management.” Clinical and experimental dermatology 16.4 (1991): 250-253. DOI: 10.1111/j.1365-2230.1991.tb00368.x
Liquid skin treatment
A composition for the maintenance of smooth, radiant, hydrated skin, including sufficient amounts of acids of hydroxyacid, to facilitate exfoliation of skin in a novel manner, without substantial irritation, as well as the prevention, treatment and management of skin conditions, such as acne, wrinkled, irregularly pigmented, photoaged, and thickened layers of the epidermis, and the like, which has as its constituents, safflower oil, flaxseed oil, sweet almond oil, apricot kernel oil, jojoba oil, organic beeswax, stearic acid, cetearyl alcohol, cocoa butter, vitamin A and tocopheral linoleate, borax, oil of lavender, and tincture of benzoin as an antimicrobial agent.
Harbeck, Marie. “Nonirritating exfoliation for radiant, hydrated skin including safflower oil, flaxseed oil, beeswax, glycol stearate, cetearyl alcohol, cocoa butter, vitamin a, tocopheral linoleate, essential oils, and tincture of benzoin.” U.S. Patent Application No. 09/753,901.
Agents acting against hyperreactive and hypoactive, deficient skin conditions and manifest dermatitides
The invention relates to the use of
a compound or several compounds from the group consisting of flavonoids
of the antioxidants or
of the endogenous energy metabolism metabolites or
of the endogenous enzymatic antioxidant systems and synthetic derivatives thereof (mimics) or
of the antimicrobial action systems or
of the antiviral action systems or
active compounds of the known, conventional treatment forms
in each case for the treatment or prophylactic treatment of hyperreactive skin predisposed to dermatitis or deficient, hypoactive skin or dermatoses.
Lanzendorfer, Ghita, Franz Stab, and Sven Untiedt. “Applying to the skin an effective amount of one or more flavonoids.” U.S. Patent No. 5,952,373. 14 Sep. 1999.
Distribution of sunscreens on skin
The effectiveness of sunscreens was originally achieved by incorporation of soluble organic UV absorbers such as cinnamates and others into cosmetic formulations. Determinations of the sun protection factor (SPF) of emulsions containing different organic UV absorbers clearly indicate that the efficacy depends on the absorption characteristics of each single UV filter substance. Nowadays, micronised pigments such as titanium dioxide or zinc oxide have also been found to be protective against harmful UV rays. Our investigations using optical and electron microscopy proved that neither surface characteristics, particle size nor shape of the micronised pigments result in any dermal absorption of this substance. Micronised titanium dioxide is solely deposited on the outermost surface of the stratum corneum and cannot be detected in deeper stratum corneum layers, the human epidermis and dermis.
Schulz, Jens, et al. “Distribution of sunscreens on skin.” Advanced drug delivery reviews 54 (2002): S157-S163. doi:10.1016/S0169-409X(02)00120-5
Skin-care agent for ageing skin
Topical formulations containing one or more compounds chosen from the group (A) consisting of sterols and biochemical precursors thereof in combination with a content of one or more compounds chosen from the group (B) consisting of ubiquinones and derivatives thereof and plastoquinones and derivatives thereof.
Hoppe, Udo, et al. “Skin-care agent for ageing skin.” U.S. Patent No. 6,261,575. 17 Jul. 2001.
Composition for skin care and protection
A composition for topical application to the skin of a human being is disclosed which provides a barrier against irritation and painful damage due to contact with many otherwise harmful materials. The composition comprises in combination water, dimethicone, stearic acid, coconut fatty acid, isopropyl myristate, glycerin, triethanolamine, cetyl alcohol, polyvinyl pyrrolidone, cetearyl alcohol, ceteareth-20, tetrasodium EDTA, hydroxyethyl cellulose, aloe vera gel, vitamin E and lanolin.
Klein, Kenneth. “Composition for skin care and protection.” U.S. Patent No. 5,208,013. 4 May 1993.
PEG-100 Stearate is made by combining natural oils (oftentimes palm or coconut) with Stearic Acid to form a water-soluble ester. It can also be a synthetic polymer made by combining Oxirane (Ethylene Oxide) and fatty acids (source). PEG-100 Stearate is primarily used by the cosmetics and beauty care industry as an emollient, an emulsifier and a moisturizer, although PEG Stearates in general are also known to clean the skin and hair by helping water to mix with oil and dirt so that they can be rinsed away, according to CosmeticsInfo.org.
Unexpected skin barrier influence from nonionic emulsifiers
Skin disorders are often treated with creams containing various active substances. The creams also contain emulsifiers, which are surface-active ingredients used to stabilize the emulsion. Emulsifiers are potential irritants and in the present study the influence of stearic acid, glyceryl stearate, PEG-2, -9, -40, and -100 stearate, steareth-2, -10 and -21 on normal as well as on irritated skin have been evaluated with non-invasive measurements. Test emulsions were created by incorporating 5% emulsifiers in a water/mineral oil mixture (50:50). The emulsions and their vehicle were then applied to normal skin for 48 h and to sodium lauryl sulfate (SLS) damaged skin for 17 h in aluminum chambers. Twenty-four hours after removal of the chambers the test sites were evaluated for degree of irritation. In normal skin, the emulsifiers induced significant differences in TEWL but not in skin blood flow. Five of the emulsifiers increased TEWL. In SLS-damaged skin an aggravation of the irritation was expected. However, no differences regarding skin blood flow was noted from the emulsifiers. Furthermore, three emulsifiers unexpectedly decreased TEWL. These results highlight the possibility of absorption of these emulsifiers into the lipid bilayer, which increase TEWL in normal skin and decrease TEWL in damaged skin.
Influence of hydrophilic surfactants on the properties of multiple W/O/W emulsions
Multiple W/O/W emulsions for topical application using Span 80 as a lipophilic emulsifier were prepared. Several hydrophilic emulsifiers were tested in respect of their suitability for the preparation of multiple emulsions. In addition, the effect of different oil-phase compositions on emulsion stability was investigated. The physicochemical parameters of the formulations were characterized and their long-term stability was evaluated by means of rheological measurements, droplet size observations and conductivity analysis.
As discovered, the modification of an oil-phase composition results in a decrease in the diffusion coefficient of water and water-soluble substances and, consequently, in enhanced stability. The influence of the release of electrolytes from the inner to the outer water phase on the emulsion stability behaviour was investigated. It was found, that the effect of the hydrophilic emulsifiers on the formulation properties is related not only to its HLB value, but rather to its chemical composition.
As a result, polyethoxylated ethers of fatty alcohols (C = 16–18) with HLBs between 15.3 and 16.2 appear to be the most suitable ones for creating stable formulations.
Instrumental and dermatologist evaluation of the effect of glycerine and urea on dry skin in atopic dermatitis
- Lodén, A.-C. Andersson, C. Andersson, T. Frödin, H. Öman and M. Lindberg. Skin Research and Technology.Volume 7, Issue 4,pages 209–213, November 2001. DOI: 10.1034/j.1600-0846.2001.70401.x
Exposure data for cosmetic products: lipstick, body lotion, and face cream
Accurate exposure information for cosmetic products and ingredients is needed in order to conduct safety assessments. Essential information includes both the amount of cosmetic product applied, and the frequency of use. To obtain current data, a study to assess consumer use practices was undertaken. The study included three widely used cosmetic product types: lipstick, body lotion, and face cream. Three hundred and sixty women, ages 19–65 years, who regularly use the products of interest, were recruited at ten different geographical locations within the US. The number of recruits was chosen to ensure a minimum of 300 completes per product type. Subjects were provided with prototype test products, and kept diaries and recorded detailed daily usage information over a two week period. Products were weighed at the start and completion of the study in order to determine the total amount of product used. Statistical analysis of the data was conducted to derive summary distribution of use patterns. The mean and median usage per application, respectively, for the three products was: face cream, 1.22 g and 0.84 g; lipstick, 10 mg and 5 mg; and body lotion, 4.42 g and 3.45 g. The mean and median usage per day for the three products was: face cream, 2.05 g and 1.53 g; lipstick, 24 mg and 13 mg; and body lotion, 8.70 g and 7.63 g. The mean number of applications per day for face cream and lipstick was 1.77 and 2.35, respectively. For body lotion, the mean number of applications per day was dependent on body area, and was 2.12, 1.52, 1.11, 0.95, 0.43, 0.26, and 0.40 for hands, arms, legs, feet, neck and throat, back, and other body areas, respectively. The effect of product preference on use practices was also investigated. This study provides current cosmetic exposure information for commonly used products which will be useful for risk assessment purposes.
L.J. Loretz, A.M. Api, L.M. Barraj, J. Burdick, W.E. Dressler, S.D. Gettings, H. Han Hsu, Y.H.L. Pan, T.A. Re, K.J. Renskers, A. Rothenstein, C.G. Scrafford, C. Sewall. Food and Chemical Toxicology. Volume 43, Issue 2, February 2005, Pages 279–291. doi:10.1016/j.fct.2004.09.016
Changes in skin barrier function following long-term treatment with moisturizers, a randomized controlled trial
Buraczewska, B. Berne, M. Lindberg, H. Törmä and M. Lodén. British Journal of Dermatology
Volume 156, Issue 3, pages 492–498, March 2007. DOI: 10.1111/j.1365-2133.2006.07685.x
In vitro skin permeation and retention of parabens from cosmetic formulations
- Pedersen, F. Marra, S. Nicoli and P. Santi. International Journal of Cosmetic Science.Volume 29, Issue 5,pages 361–367, October 2007. DOI: 10.1111/j.1468-2494.2007.00388.x
Percutaneous absorption of parabens from cosmetic formulations
DAL POZZO and N. PASTORI. International Journal of Cosmetic Science
Volume 18, Issue 2, pages 57–66, April 1996. DOI: 10.1111/j.1467-2494.1996.tb00135.x
Structure/Effect Studies of Fatty Acid Isomers as Skin Penetration Enhancers and Skin Irritants
Comparisons were made of branched vs unbranched saturated fatty acids and cis vs trans unsaturated fatty acids as skin penetration enhancers and primary skin irritants. Skin penetration studies used naloxone base as the diffusant, propylene glycol as the vehicle, and human skin. Maximum naloxone flux was with C9–12-branched and unbranched fatty acids. For C5–14 fatty acids, branched and unbranched isomers had similar effects. One branched C18 fatty acid isomer (C16-branched isostearic acid) was more effective in enhancing skin penetration than a differently branched (C2-branched isostearic acid) or unbranched C18 isomer (stearic acid). There was no significant difference between cis and trans unsaturated C16–18 fatty acid isomers in their effects on naloxone flux, and all unsaturated fatty acids were more effective enhancers than the corresponding saturated isomers. Several of these fatty acid/propylene glycol vehicles were evaluated in a rabbit primary skin irritation test. Irritation indices were poorly correlated with the effectiveness of the vehicles in enhancing naloxone flux. It was possible to enhance naloxone skin penetration greatly with a vehicle with only minimal skin irritation potential.
Aungst, Bruce J. “Structure/effect studies of fatty acid isomers as skin penetration enhancers and skin irritants.” Pharmaceutical research 6.3 (1989): 244-247. DOI 10.1023/A:1015921702258
A comparative study of stearic and lignoceric acid oxidation by human skin fibroblasts
Sensitive assays were developed for long chain and very long chain fatty acid oxidation in human skin fibroblast homogenates. Stearic and lignoceric acids were degraded by the fibroblasts by the β-oxidation pathway. The cofactor requirements for stearic and lignoceric acid β-oxidation were very similar but not identical. For example, appreciable lignoceric acid oxidation could be demonstrated only in the presence of α-cyclodextrin and was inhibited by Triton X-100. In Zellweger’s syndrome, stearic acid β-oxidation was partially reduced whereas lignoceric acid β-oxidation was reduced dramatically (< 12% activity compared to the controls). The results presented suggest that stearic acid β-oxidation occurs in mitochondria as well as in peroxisomes, but lignoceric acid oxidation occurs entirely in the peroxisomes. We suggest that the β-oxidation systems for stearic acid and lignoceric acid may be different.
Singh, Harmeet, and Alf Poulos. “A comparative study of stearic and lignoceric acid oxidation by human skin fibroblasts.” Archives of biochemistry and biophysics 250.1 (1986): 171-179. doi:10.1016/0003-9861(86)90714-9
The contact angle of water on viable human skin
The contact angle of water was measured on clean dry skin and on skin coated with the following materials: paraffin, stearic acid, a lanolin derivative, a quaternary ammonium salt, and hydrophilic and hydrophobic silicones. The area of skin tested was the upper surface of the index finger, which was positioned on the stage of a contact angle telescope goniometer. Clean and degreased skin gave a high contact angle with water (> 100°). All agents studied reduced the water droplet contact angle when applied to the skin. Reductions of contact angles were observed at very low levels of application. Unexpected results were obtained with stearic acid. The water droplet contact angle reduced to a minimum of 70° at 100 μgm stearic acid/cm2 on skin, but further application of stearic acid yielded increasing contact angles to levels from 105° to 120°, depending upon the subject tested.
Ginn, M. E., C. M. Noyes, and Eric Jungermann. “The contact angle of water on viable human skin.” Journal of colloid and interface science 26.2 (1968): 146-151. doi:10.1016/0021-9797(68)90306-8
An electron spin resonance study of skin penetration enhancers
The structured intercellular lipids of the stratum corneum are thought to play an important role in controlling the transport of drugs across the skin. In this study, multilamellar dipalmitoylphosphatidylcholine liposomes were used as a model of structured lipids. The effect of temperature and skin penetration enhancers on the lipid bilayer, was assessed using a spin labelling technique, in which 5-doxyl stearic acid was incorporated into the bilayer. The order parameter (S) of the spin label was calculated from the observed spectra. An increase in temperature decreased the order parameter. This decrease is due to increased rotational movement of the acyl chain of the spin label about its long molecular axis. It indicates a decrease in order within the bilayer structure, as a result of increased flexibility of the lipid molecules. Known skin penetration enhancers, Brij 36T, n-decylmethyl sulphoxide and oleic acid, also decreased the order parameter of the spin label. The penetration enhancer N-methyl-2-pyrrolidone had no significant effect. The results obtained were confirmed using a light scattering technique, in which the phase transition temperature of the liposomes was monitored in the presence and absence of the enhancers. 5-Doxyl stearic acid was incorporated into stratum corneum, separated from human cadaver skin. The spectra obtained were similar to those of the liposomal samples and the application of n-decylmethyl sulphoxide had a similar effect on the order parameter.
A cosmetic preparation is disclosed which is effective in moisturizing and softening skin, improving texture and feel of skin, and diminishing superficial and deep wrinkles in skin. The preparation comprises gibberellic acid and lysine as active ingredients. The preparation can contain as additional active ingredients gliadin, ascorbic acid and urea.
Parkinson, Richard W. “Gibberellic acid, lysine, skin softener.” U.S. Patent No. 4,518,614. 21 May 1985.
Cleansing without compromise: the impact of cleansers on the skin barrier and the technology of mild cleansing
Cleanser technology has come a long way from merely cleansing to providing mildness and moisturizing benefits as well. It is known that harsh surfactants in cleansers can cause damage to skin proteins and lipids, leading to after-wash tightness, dryness, barrier damage, irritation, and even itch. In order for cleansers to provide skin-care benefits, they first must minimize surfactant damage to skin proteins and lipids. Secondly, they must deposit and deliver beneficial agents such as occlusives, skin lipids, and humectants under wash conditions to improve skin hydration, as well as mechanical and visual properties. While all surfactants tend to interact to some degree with lipids, their interaction with proteins can vary significantly, depending upon the nature of their functional head group. In vitro, ex vivo, and in vivo studies have shown that surfactants that cause significant skin irritation interact strongly with skin proteins. Based on this understanding, several surfactants and surfactant mixtures have been identified as “less irritating” mild surfactants because of their diminished interactions with skin proteins. Surfactants that interact minimally with both skin lipids and proteins are especially mild. Another factor that can aggravate surfactant-induced dryness and irritation is the pH of the cleanser. The present authors’ recent studies demonstrate that high pH (pH 10) solutions, even in the absence of surfactants, can increase stratum corneum (SC) swelling and alter lipid rigidity, thereby suggesting that cleansers with neutral or acidic pH, close to SC-normal pH 5.5, may be potentially less damaging to the skin. Mildness enhancers and moisturizing agents such as lipids, occlusives, and humectants minimize damaging interactions between surfactants, and skin proteins and lipids, and thereby, reduce skin damage. In addition, these agents play an ameliorative role, replenishing the skin lipids lost during the wash period. The present review discusses the benefits of such agents and their respective roles in improving the overall health of the skin barrier.
Dietary trans fatty acids increase conjugated linoleic acid levels in human serum
Conjugated linoleic acid (CLA), fatty acids with 18 carbon atoms and two conjugated cis/trans double bonds, have shown anticarcinogenic effects in experimental studies. We determined the proportion of CLA (the sum of cis-9, trans-11 and trans-9, cis-11 CLA) of total fatty acids in the diets and serum samples of healthy subjects who consumed for 5 weeks a diet high in saturated fatty acids mainly from dairy fat, followed by 5 weeks on a diet high (8.7% of energy, en%) in trans fatty acids from partially hydrogenated vegetable oil (40 subjects) or a similar diet high in stearic acid (9.3 en%, 40 subjects). All diets contained equal amounts of fat and cis-monounsaturated and cis-polyunsaturated fatty acids. The fatty acid compositions of the pooled diets and fasting serum samples drawn at the end of the diet periods were analyzed by gas chromatography, and CLA was identified by comparison with a standard of C18:2 conjugated dienes. The proportions of CLA in the dairy fat, trans fatty acid, and stearic acid diets were 0.37, 0.04, and 0.10% of total methylated fatty acids, respectively. The corresponding mean (SD) proportions in serum were 0.33 (0.07)% after the dairy fat diet, higher, 0.43 (0.12)%, P < 0.001, after the trans fatty acid diet, and lower, 0.17 (0.06)%, P < 0.001, after the stearic acid diet. The difference between dairy fat and stearic acid diets was explained by different dietary intakes but increased amounts of CLA not present in the diet were incorporated into serum lipids during the trans fatty acid diet. CLA in human tissues is partly derived from the diet but part of it may be formed by conversion from dietary trans fatty acids.
Salminen, Irma, et al. “Dietary trans fatty acids increase conjugated linoleic acid levels in human serum.” The Journal of Nutritional Biochemistry 9.2 (1998): 93-98. doi:10.1016/S0955-2863(97)00173-3
A comparative study of straight chain and branched chain fatty acid oxidation in skin fibroblasts from patients with peroxisomal disorders.
The beta-oxidation of stearic acid and of alpha- and gamma-methyl isoprenoid-derived fatty acids (pristanic and tetramethylheptadecanoic acids, respectively) was investigated in normal skin fibroblasts and in fibroblasts from patients with inherited defects in peroxisomal biogenesis. Stearic acid beta-oxidation by normal fibroblast homogenates was several-fold greater compared to the oxidation of the two branched chain fatty acids. The effect of phosphatidylcholine, alpha-cyclodextrin, and bovine serum albumin on the three activities suggests that different enzymes are involved in the beta-oxidation of straight chain and branched chain fatty acids. Homogenates of fibroblasts from patients with a deficiency in peroxisomes (Zellweger syndrome and infantile Refsum’s disease) showed a normal ability to beta-oxidize stearic acid, but the oxidation of pristanic and tetramethylheptadecanoic acid was decreased. Concomitantly, 14CO2 production from the branched chain fatty acids by Zellweger fibroblasts in culture (but not from stearic acid) was greatly diminished. The Zellweger fibroblasts also showed a marked reduction in the amount of water-soluble metabolites from the radiolabeled branched chain fatty acids that are released into the culture medium. The data presented indicate that the oxidation of alpha- and gamma-methyl isoprenoid-derived fatty acids takes place largely in peroxisomes in human skin fibroblasts.
Singh, Harmeet, et al. “A comparative study of straight chain and branched chain fatty acid oxidation in skin fibroblasts from patients with peroxisomal disorders.” Journal of lipid research 31.2 (1990): 217-225.
Xanthan gum: production, recovery, and properties
Xanthan gum is a microbial polysaccharide of great commercial significance. This review focuses on various aspects of xanthan production, including the producing organismXanthomonas campestris, the kinetics of growth and production, the downstream recovery of the polysaccharide, and the solution properties of xanthan.
Antioxidative properties of xanthan on the autoxidation of soybean oil in cyclodextrin emulsion.
Antioxidative properties of xanthan on the autoxidation of soybean oil in cyclodextrin emulsion.Kazuko. Shimada , Kuniko. Fujikawa , Keiko. Yahara , Takashi. Nakamura. J. Agric. Food Chem., 1992, 40 (6), pp 945–948. DOI: 10.1021/jf00018a005
Xanthan gum biosynthesis and application: a biochemical /genetic perspective
Xanthan gum is a complex exopolysaccharide produced by the plant-pathogenic bacteriumXanthomonas campestris pv. campestris. It consists of D-glucosyl, D-mannosyl, and D-glucuronyl acid residues in a molar ratio of 2:2:1 and variable proportions of O-acetyl and pyruvyl residues. Because of its physical properties, it is widely used as a thickener or viscosifier in both food and non-food industries. Xanthan gum is also used as a stabilizer for a wide variety of suspensions, emulsions, and foams. This article outlines aspects of the biochemical assembly and genetic loci involved in its biosynthesis, including the synthesis of the sugar nucleotide substrates, the building and decoration of the pentasaccharide subunit, and the polymerization and secretion of the polymer. An overview of the applications and industrial production of xanthan is also covered.
Xanthan gum biosynthesis and application: a biochemical /genetic perspective. A. Becker,F. Katzen, A. Pühler, L. Ielpi. Applied Microbiology and Biotechnology. August 1998, Volume 50, Issue 2, pp 145-152.
Intermolecular binding of xanthan gum and carob gum
Gels are a representative state for polysaccharides in both natural and artificial systems. The nature of the inter-chain associations within the junction zones is important and models for such interactions between like polysaccharides are based on X-ray diffraction studies of oriented gels. Here we describe the extension of such studies to a binary gel (xanthan-carob) in order to characterize for the first time intermolecular binding between different polysaccharides. Xanthan-carob binding has been proposed to explain gelation of the mixtures and as a model for host-pathogen recognition and adhesion of Xanthomonas bacteria within plant vascular systems. Our data suggest that the established model1–7 is incorrect and point to an alternative association mechanism.
Intermolecular binding of xanthan gum and carob gum. P. CAIRNS, M. J. MILES & V. J. MORRIS. Nature 322, 89 – 90 (03 July 1986); doi:10.1038/322089a0
Aspartic acid racemization: evidence for marked longevity of elastin in human skin
Background In extracellular proteins, aspartic acid racemization (AAR) has the potential to identify long-lived or permanent proteins.
Objectives We present data to show an age-dependent increase in AAR in chronologically aged skin elastin.
Methods Elastin was purified in a multistep procedure designed to remove contaminating proteins and to avoid induced racemization. As a control experiment, elastin was also purified from the richest elastin bearing tissue, the yellow ligaments of the spine.
Results In total skin, specimens displayed a slight age-dependent increase in d-aspartyl residues, but in purified elastin the rate of increase was rapid and highly correlated with age (r = 0·98). Similar rates were observed in the control data from the yellow ligaments. The AAR rates were found to be higher in elastin from skin (and yellow ligaments) than previous studies of lung parenchyma and from aorta had shown. These differences appear to be related to the purity of the extracted elastin product, and to a significant in vivo degradation of elastin in skin.
Conclusions The age-dependent accumulation of modified aspartic acid residues appears to be a common feature in ageing elastin, independent of the tissue source. This indicates a lack of turnover and an accumulation of elastin damage in diverse ageing tissues, possibly as part of programmed ageing.
Aspartic acid racemization: evidence for marked longevity of elastin in human skin.
Ritz‐Timme, Stefanie, I. Laumeier, and Matthew J. Collins. “Aspartic acid racemization: evidence for marked longevity of elastin in human skin.” British Journal of Dermatology 149.5 (2003): 951-959. DOI: 10.1111/j.1365-2133.2003.05618.x
Determination of desmosines in elastin-related skin disorders by isocratic high-performance liquid chromatography
Abnormalities in the amount of skin elastin occur in several cutaneous disorders. The number of elastic fibers is increased in elastotic disorders such as pseudoxanthoma elasticum (PXE) and cutis rhomboidalis nuchae (actinic elastosis, AE) and is decreased in elastolytic disorders such as cutis laxa (CL). We describe a procedure to quantify desmosines and elastin in small amounts of skin using high-performance liquid chromatography (HPLC). Biopsies were obtained from normal, nonsolar exposed skin and from the lesional skin of patients with PXE, cutis rhomboidalis nuchae, and CL. Specimens were subjected to hot alkali treatment and the desmosines were released by acid hydrolysis and quantified by HPLC. The mean value for normal skin was 252 ± 28 ng desmosines per milligram wet weight (SD, n = 5). The disorders of elastosis (PXE and AE) demonstrated a two-to fivefold increased content of desmosines. In contrast, the elastolytic disorder (CL) had only 20% of the normal content of esmosines. Furthermore, PXE and normal skin elastins had the same amount of desmosines per milligram purified elastin. This method could be used to evaluate the extent of elastosis or elastolysis in a particular lesion.
Schwartz, Elaine, Frederick A. Cruickshank, and Mark Lebwohl. “Determination of desmosines in elastin-related skin disorders by isocratic high-performance liquid chromatography.” Experimental and molecular pathology 52.1 (1990): 63-68. doi:10.1016/0014-4800(90)90059-M
Molecular basis of sun-induced premature skin ageing and retinoid antagonism
DAMAGE to skin collagen and elastin (extracellular matrix) is the hallmark of long-term exposure to solar ultraviolet irradiation(1-3), and is believed to be responsible for the wrinkled appearance of sun-exposed skin(4,5). We report here that matrix-degrading metalloproteinase messenger RNAs, proteins and activities are induced in human skin in vivo within hours of exposure to ultraviolet-B irradiation (UVB). Induction of metalloproteinase proteins and activities occurred at UVB doses well below those that cause skin reddening. Within minutes, low-dose UVB upregulated the transcription factors AP-1 and NF-kappa B, which are known to be stimulators of metalloproteinase genes(6,7). All-trans retinoic acid, which transrepresses AP-1 (ref. 8), applied before irradiation with UVB, substantially reduced AP-1 and metalloproteinase induction, We propose that elevated metalloproteinases, resulting from activation of AP-1 and NF-kappa B by low dose solar irradiation, degrade collagen and elastin in skin, Such damage, if imperfectly repaired would result in solar scars, which through accumulation from a lifetime of repeated low-dose sunlight exposure could cause premature skin ageing (photoageing).
Fisher, Gary J., et al. “Molecular basis of sun-induced premature skin ageing and retinoid antagonism.” (1996). http://dx.doi.org/10.1038/379335a0
A monoclonal antibody (Mab 67) marks type B synoviocytes
The functionally important lining cells of the synovium (types A and B synoviocytes) are the subjects of much study but have presented problems with their characterization and microscopical identification, particularly at the light level. Type A (macrophage-like) synoviocytes, however are more easily localized than the type B (fibroblast-like) variety because of the greater availability of antimacrophage antisera. We describe, using light and electron microscopy, a monoclonal antibody which in the synovial intimal layer is specific for type B synoviocytes.
Stevens, C. R., P. I. Mapp, and P. A. Revell. “A monoclonal antibody (Mab 67) marks type B synoviocytes.” Rheumatology international 10.3 (1990): 103-106. DOI
Transforming growth factor-beta up-regulates elastin gene expression in human skin fibroblasts. Evidence for post-transcriptional modulation.
Transforming growth factor-beta s (TGF-beta) are potent enhancers of the expression of several connective tissue genes. In this study we examined the effects of TGF-beta 1 and TGF-beta 2 on human elastin mRNA abundance, promoter activity, and mRNA stability in cultured human skin fibroblasts. Treatment of cell cultures with varying concentrations of TGF-beta 1 or TGF-beta 2 for 24 hours resulted in a dose-dependent increase in the elastin mRNA steady-state levels, with a maximum enhancement of approximately 30-fold being noted with 1 ng/ml. Addition of cycloheximide (10 micrograms/ml) failed to block up-regulation of elastin gene expression by TGF-beta, indicating that this effect can occur in the absence of active protein synthesis. Furthermore, TGF-beta elicited enhancement of elastin mRNA levels could be abrogated by tumor necrosis factor-alpha and partially counteracted by interferon-gamma. Transient transfections of human skin fibroblasts with elastin promoter/chloramphenicol acetyl-transferase reporter gene constructs, which contained up to approximately 5 kb of the 5′ flanking DNA, revealed no change in the promoter activity in the presence of TGF-beta. However, TGF-beta appeared to stabilize the elastin mRNA transcripts as determined by Northern hybridizations after inhibition of initiation of the transcription. As a result of this stabilization, the elastin mRNA levels were clearly detectable in TGF-beta 1-treated cultures even up to 48 hours after inhibition of transcription while they were undetectable in the control cells after 24 hours of incubation. These results demonstrate that TGF-beta 1 and TGF-beta 2 are potent enhancers of elastin gene expression and that this effect is mediated, at least in part, post-transcriptionally. These results suggest that TGF-beta s are involved in regulation of elastin deposition during fetal development and tissue repair, as well as in pathological conditions.
Connective tissue nevi of the skin: Clinical, genetic, and histopathologic classification of hamartomas of the collagen, elastin, and proteoglycan type
Connective tissue nevi of the skin are hamartomatous lesions consisting predominantly of one of the components of the extracellular matrix, namely, collagen, elastin, or glycosaminoglycans. On the basis of clinical, histopathologic, and genetic considerations, the connective tissue nevi can be classified into defined categories. Association with extracutaneous features allows further delineation of these disease entities and aids in establishing an accurate diagnosis.
Uitto, Jouni, Daniel J. Santa Cruz, and Arthur Z. Eisen. “Connective tissue nevi of the skin: clinical, genetic, and histopathologic classification of hamartomas of the collagen, elastin, and proteoglycan type.” Journal of the American Academy of Dermatology 3.5 (1980): 441-461. doi:10.1016/S0190-9622(80)80106-X
Extracellular matrix characterization during healing of full-thickness wounds treated with a collagen/elastin dermal substitute shows improved skin regeneration in pigs.
We investigated the architecture of the extracellular matrix (ECM) during healing of full-thickness wounds in the pig. Two different treatments, one based on epidermal transplantation (split skin mesh grafts, SP wounds) and one consisting of a combination of epidermal transplantation and a dermal matrix substitute (MA wounds) were compared. The dermal matrix consisted of native bovine collagen coated with elastin hydrolysate. The latter treatment reduced wound contraction and improved tissue regeneration. The expression patterns of fibronectin, von Willebrand factor, laminin, chondroitin sulfate, and elastin, detected by immunohistochemistry, were examined in time and indicated different stages of healing. During the early phase of healing the dermal matrix induced more granulation tissue, a different fibronectin expression pattern, and rapid vascular cell ingrowth (von Willebrand factor). Furthermore, in the MA wounds chondroitin sulfate was detected earlier in the basement membrane and fibronectin staining disappeared more rapidly. During later stages of healing, chondroitin sulfate expression was selective for areas in which ECM remodeling was active; in these specific areas elastin staining reappeared. ECM remodeling and elastin regeneration occurred both in the upper and lower dermis for the MA wounds but only in the upper dermis for the SP wounds. Electron microscopic evaluation of the wounds after 2 weeks showed many myofibroblasts in the SP wounds, whereas in the MA wounds cells associated with the dermal matrix had characteristics of normal fibroblasts. The results suggest that the biodegradable dermal matrix served as a template for dermal tissue regeneration, allowed faster regeneration, and improved the quality of healing in large full-thickness skin defects.
Lamme, Evert N., et al. “Extracellular matrix characterization during healing of full-thickness wounds treated with a collagen/elastin dermal substitute shows improved skin regeneration in pigs.” Journal of Histochemistry & Cytochemistry 44.11 (1996): 1311-1322. doi: 10.1177/44.11.8918906
Effect of potassium sorbate washing on the growth of Listeria monocytogenes on fresh poultry
This work evaluated the effect of potassium sorbate washing on the growth of Listeria monocytogenes on poultry legs stored at 4 °C for 7 days. Fresh inoculated chicken legs were dipped into either a 2.5% (w/v) or 5% potassium sorbate solution or distilled water (control). Changes in mesophiles, pychrotrophic counts and sensorial characteristics (odor, color, texture and overall appearance) were also evaluated.
The shelf life of the samples washed with potassium sorbate was extended by at least 2 days over the control samples washed with distilled water. Legs washed with 5% potassium sorbate showed a significant (p < 0.05) inhibitory effect on L. monocytogenes compared to control legs, with a decrease of about 1.3 log units after 7 days of storage. Sensory quality was not adversely affected by potassium sorbate.
González-Fandos, E., and J. L. Dominguez. “Effect of potassium sorbate washing on the growth of Listeria monocytogenes on fresh poultry.” Food Control 18.7 (2007): 842-846. doi:10.1016/j.foodcont.2006.04.008
Potassium Sorbate Diffusivity in American Processed and Mozzarella Cheeses
The diffusivity of potassium sorbate in cheeses was determined by using diffusion models and computer programming for examining the residual surface concentration and the penetration of surface-applied potassium sorbate into cheese. To determine diffusivity, the concentration of potassium sorbate in sliced cheese was measured by penetration time and distance from surface. The diffusivity was calculated by nonlinear regression with experimental data based on Fick’s law. The diffusivity of potassium sorbate through American processed cheese was 1.31∞10-6 cm2/sec and for Mozzarella cheese 6.74∞10-7 cm2/sec. This indicated that Mozzarella cheese would maintain surface concentration of potassium sorbate above the critical fungistatic level two times longer than American processed cheese.
Han, Jung Hoon, and John D. Floros. “Potassium sorbate diffusivity in American processed and Mozzarella cheeses.” Journal of food science 63.3 (1998): 435-437. DOI: 10.1111/j.1365-2621.1998.tb15758.x
Food applications of sorbic acid and its salts
Because of their physiological inertness, their effectiveness even in the weakly acid pH range and their neutral taste, sorbic acid and its salts have become the leading preservatives in the food sector throughout the world over the past 30 years. The most commonly used products are sorbic acid itself (E200) and potassium sorbate (E202). In many countries sodium sorbate (E201) and calcium sorbate (E203) are also permitted. Sorbic acid is sparingly soluble in water, sodium sorbate has better solubility, and potassium sorbate is very freely soluble and can be used to produce 50% stock solutions. The soluble sorbates are preferred when it is desired to use the preservative in liquid form, or when aqueous systems are to be preserved. Sodium sorbate in solid form is unstable and very rapidly undergoes oxidation on exposure to atmospheric oxygen. It is therefore not produced on the industrial scale. Aqueous solutions of sodium sorbate remain stable for some time. Calcium sorbate is used in the manufacture of fungistatic wrappers because it is highly stable to oxidation, but this use is very limited. Sorbic acid and sorbates can be directly added into the product. The products can be dipped or sprayed with aqueous solutions of sorbates. Dusting of food with dry sorbic acid is also possible but less recommended because sorbic acid irritates the skin and mucous membranes. Sorbic acid and particularly calcium sorbate can be used as active substances in fungistatic wrappers. A general survey of the numerous uses of sorbic acid in the food sector will be given. Some fields of application will be discussed that are either unimportant or not permitted in the U.K.
Lück, E. “Food applications of sorbic acid and its salts.” Food Additives & Contaminants 7.5 (1990): 711-715. DOI:10.1080/02652039009373936
Extending Shelf-Life of Fresh Wet Red Hake and Salmon Using CO2-O2 Modified Atmosphere and Potassium Sorbate Ice at 1°C
The ability to safely extend the shelf-life of fish would open up the possibility of shipping fresh wet fish by boat. Red hake and salmon can be successfully held for almost 1 month and still be sensorally acceptable. A 60% carbon dioxide:20% oxygen:20% nitrogen-modified atmosphere with a 1% potassium sorbate ice was most satisfactory. CO2 did not lower the pH of the fish. Low temperature (1°C) and presence of both oxygen and potassium sorbate served as protection against botulism development. The presence of oxygen, even with salmon, did not lead to rancidity (TBA) problems. The Torrymeter can be used to monitor red hake quality. Work incorporating potassium sorbate dips before modified atmosphere storage with or without potassium sorbate ice is needed.
Fey, M. S., and J. M. Regenstein. “Extending Shelf‐Life of Fresh Wet Red Hake and Salmon Using CO2‐O2 Modified Atmosphere and Potassium Sorbate Ice at 1° C.” Journal of Food Science 47.4 (1982): 1048-1054. DOI: 10.1111/j.1365-2621.1982.tb07619.x
INDIVIDUAL AND COMBINED LISTERICIDAL EFFECTS OF SODIUM LACTATE, POTASSIUM SORBATE, NISIN AND CURING SALTS AT REFRIGERATION TEMPERATURE
The individual and combined antilisterial activity of the preservatives sodium lactate (4%), potassium sorbate (0.3%) and nisin (400 IU/ml), in either the presence or absence of the curing salts nitrite (125 ppm) and polyphosphate (0.5%), was assessed in buffered BHI broth (pH 5.5) during incubation at 4C. A cocktail of the strain Listeria monocytogenes NCTC 7973 and two food derived strains was used as the inoculum in challenge studies. In the absence of the preservatives, L. monocytogenes grew in the presence of polyphosphate but not in the presence of nitrite or a combination of nitrite and polyphosphate. The antilisterial action of nitrite was predominantly bacteriostatic in nature. Lactate acting alone, or in the presence of curing salts, produced a bacteriostatic effect. Sorbate acting alone had a bacteriostatic effect. Sorbate acting in the presence of nitrite or nitrite and polyphosphate produced a marked listericidal effect, reducing the population by 6.7 logs and 5.4 logs, respectively. Nisin acting alone produced an almost immediate 90% listericidal response (1 log population decrease), but initial numbers were restored within 14 days by regrowth. Regrowth was eliminated when nisin was used in combination with lactate, nitrite or nitrite and polyphosphate. The combination of lactate and sorbate offered no advantage over the use of sorbate alone. Sorbate and nisin acting in combination produced an enhanced listericidal effect, which was also seen in the presence of curing salts, but was delayed. No listericidal advantage over sorbate-nisin combination was achieved through the use of the lactate-sorbate-nisin combination. The combined use of sorbate and nisin offers promise as a means of eliminating L. monocytogenes from low pH cured meat products. The efficacy of this preservative combination remains to be evaluated in a meat system before its practical application can be considered.
Buncic, S., et al. “Individual and combined listericidal effects of sodium lactate, potassium sorbate, nisin and curing salts at refrigeration temperature.” Journal of Food Safety 15.3 (1995): 247-264. DOI: 10.1111/j.1745-4565.1995.tb00137.x
SHELF-LIFE AND QUALITY CHARACTERISTICS OF POULTRY PARTS DIPPED IN POTASSIUM SORBATE
Fresh, broiler parts were dipped 30 or 60 set in solutions of potassium sorbate. Drumsticks were stored at refrigerator temperature and evaluated daily for off-odor development and total counts. Thighs and breasts were baked to internal breast temperature of 85°C cooled, then evaluated for shear press values, moisture retention, and sensory properties. Drumsticks dipped in potassium sorbate developed off-odors later than the controls. Those parts dipped in 10% potassium sorbate had a 20-day shelf-life at 4°C, based on off-odor development and time for total counts to reach 10′. Parts dipped i
n potassium sorbate for 30 set, drained, then baked had similar Shear Press (tenderness) and Carver Press (moisture retention) values regardless of the sorbate concentration used. Taste panel members could not distinguish between those parts dipped in 5 or 10% potassium sorbate and those parts dipped in distilled water. Sensory evaluations were significantly lower for those parts dipped in 15% potassium sorbate solutions for 1 mm. Parts dipped in 5 or 10% solutions for 1 mm were indistinguishable from the controls.
Cunningham, F. E. “Shelf‐life and quality characteristics of poultry parts dipped in potassium sorbate.” Journal of Food Science 44.3 (1979): 863-864. DOI: 10.1111/j.1365-2621.1979.tb08522.x
Effects of Cetylpyridinium Chloride, Acidified Sodium Chlorite, and Potassium Sorbate on Populations of Escherichia coli O157:H7, Listeria monocytogenes, and Staphylococcus aureus on Fresh Beef
The effects of selected food-grade antimicrobial agents at decreasing the number of pathogenic bacteria on fresh beef were determined. Beef cubes inoculated with Escherichia coli O157:H7, Listeria monocytogenes, or Staphylococcus aureus were sprayed with 0.5% cetylpyridinium chloride (CPC), 0.12% acidified sodium chlorite (ASC), 0.1% potassium sorbate (PS), or an equal mix of any two solutions. The beef samples were placed on absorbent tray pads sprayed with each single or mixed solution, wrapped with polyvinyl chloride film, heat sealed, and stored at 4°C for 2 weeks. Surface sanitization using CPC, ASC, or an equal mix of these two agents effectively reduced microbial numbers on the beef during storage. At day 0, ASC and the CPC-ASC mix reduced the number of E. coli O157:H7 by 2.50 and 1.58 log CFU/cm2, respectively. CPC demonstrated a 3.25-log reduction of L. monocytogenes and a 4.70-log reduction of S. aureus at 14 days. The CPC-PS mix reduced E. coli O157:H7 numbers by 1.46, L. monocytogenes by 2.95, and S. aureus by 4.41 log CFU/cm2 at 14 days. PS alone and the mixed solutions, CPC-ASC, CPC-PS, or ASC-PS, were not as effective as ASC or CPC alone. To effectively reduce E. coli O157:H7, L. monocytogenes, or S. aureus numbers, higher (>0.1%) concentrations of PS were necessary. Loss of redness and light color of beef surfaces consistently coincided with decreases in pH for ASC-treated beef samples.
Lim, Kyungwha, and Azlin Mustapha. “Effects of cetylpyridinium chloride, acidified sodium chlorite, and potassium sorbate on populations of Escherichia coli O157: H7, Listeria monocytogenes, and Staphylococcus aureus on fresh beef.” Journal of Food Protection® 67.2 (2004): 310-315.
Sorbic Acid and Potassium Sorbate Permeability of an Edible Methylcellulose-Palmitic Acid Film: Water Activity and pH Effects
The apparent permeability constants for potassium sorbate and sorbic acid through an edible film composed of methylcellulose and palmitic acid (weight ratio 3:1) were evaluated as a function of water activity (aw) and pH. For films with thickness 55–66 μm, potassium sorbate permeability increased from 2.3 × 10−10 to 2.0 × 10−8 (mg/sec cm2)(cm)/(mg/mL) as aw increased from 0.65 to 0.80. Films were not stable at aw levels above 0.80. Permeability of the film to sorbic acid at aw 0.8 decreased from 3.3 × 10−8 to 9.1 × 10−10 (mg/sec cm2)(cm)/ (mg/mL) as pH increased from 3 to 7. At pH 3 the undissociated acid was 97.5% and at pH 7 it was 0.4%.
RICO‐PEÑA, DELMY C., and J. ANTONIO TORRES. “Sorbic Acid and Potassium Sorbate Permeability of an Edible Methylcellulose‐Palmitic Acid Film: Water Activity and pH Effects.” Journal of Food Science 56.2 (1991): 497-499. DOI: 10.1111/j.1365-2621.1991.tb05312.x
Effect of lipid-containing, positively charged nanoemulsions on skin hydration, elasticity and erythema—An in vivo study
Dry skin and other skin disorders such as atopic dermatitis are characterized by impaired stratum corneum (SC) barrier function and by an increase in transepidermal water loss (TEWL) leading to a decrease in skin hydration. The possibility that dermatological and cosmetic products containing SC lipids could play a part in the restoration of disturbed skin barrier function is of great interest in the field of dermatology and cosmetics. The aim of the present study was to evaluate the effect of positively charged oil/water nanoemulsions (PN) containing ceramide 3B and naturally found SC lipids (PNSC) such as ceramide 3, cholesterol, and palmitic acid on skin hydration, elasticity, and erythema. Creams of PNSC were compared to PN creams, to creams with negatively charged o/w nanoemulsion and SC lipids (NNSC) and to Physiogel® cream, a SC lipid containing formulation, which is already on the market. The formulations (PN, PNSC, and NNSC) were prepared by high-pressure homogenization. After adding Carbopol 940 as thickener, particle size and stability of the creams were not significantly changed compared to the nanoemulsions. The studies were carried out on three groups, each with 14 healthy female test subjects between 25 and 50 years of age, using Corneometer® 825, Cutometer® SEM 575 and Mexameter® 18 for measurements of skin hydration, elasticity, and erythema of the skin, respectively. The creams were applied regularly and well tolerated throughout the study. All formulations increased skin hydration and elasticity. There was no significant difference between PNSC and Physiogel®. However, PNSC was significantly more effective in increasing skin hydration and elasticity than PN and NNSC indicating that phytosphingosine inducing the positive charge, SC lipids and ceramide 3B are crucial for the enhanced effect on skin hydration and viscoelasticity.
Yilmaz, Erol, and Hans-Hubert Borchert. “Effect of lipid-containing, positively charged nanoemulsions on skin hydration, elasticity and erythema—an in vivo study.” International journal of pharmaceutics 307.2 (2006): 232-238. doi:10.1016/j.ijpharm.2005.10.002
Control of Two Major Pathogens on Fresh Poultry Using a Combination Potassum Sorbate/Karbon Dioxide Packaging Treatment
Salmonella enteriditis and Staphylococcus aureus were separately inoculated onto fresh chicken thighs prior to dipping in 0, 1.0, 2.5, or 5.0% potassium sorbate solutions adjusted to pH 6.0. Treated samples were packaged in Nylon/Plexar/Surlyn bags under air, vacuum, 20%, 60%, or 100% CO2 atmospheres and stored at 10°C ± 1.0°C for 10 days. Changes in gaseous headspace composition, sorbate concentrations, surface pH, and microbial numbers were monitored during the storage period. S. enteriditis was more sensitive to potassium sorbate than S. aureus; growth on poultry of the latter organism was more effectively inhibited by exposure to high levels of CO2. Increased concentrations of sorbate dip solutions in combination with higher concentrations of CO2 in the package environment provided a more effective inhibitory system against growth of both pathogens on fresh poultry.
Gray, R. J. H., P. H. Elliott, and R. I. Tomlins. “Control of Two Major Pathogens on Fresh Poultry Using a Combination Potassum Sorbate/Karbon Dioxide Packaging Treatment.” Journal of Food science 49.1 (1984): 142-145. DOI: 10.1111/j.1365-2621.1984.tb13691.x
Effects of High-Molecular-Weight Sodium Hyaluronate on Experimental Osteoarthrosis Induced by the Resection of Rabbit Anterior Cruciate Ligament.
Sodium hyaluronate (HA) with a molecular weight of 202 x 104 (HA-202) was administered into the right knees of mature rabbits for the treatment of experimental osteoarthrosis induced by resection of the anterior cruciate ligament. At six and 12 weeks after the initiation of administration, the test group was compared with a group administered physiological saline solution to determine the effects on articular cartilage and synovial tissue. In both the six- and the 12-week period, cartilage degeneration proceeded with the lapse of time in both groups; however at 12 weeks, the efficacy of HA-202 in inhibiting degeneration was clearly observed at the lateral condyle of the femur and tibia where relatively marked degeneration was observed in the saline group. A comparison was also made among three groups administered HA-95 (sodium hyaluronate with a molecular weight of 95 x 104), HA-202, and saline, respectively, for 12 weeks. The saline group showed the greatest cartilage degeneration accompanied by complete disorganization of the cartilage layer and the disappearance of chondrocytes. The degeneration was less in the HA groups, and it was more significantly inhibited in the HA-202 group than in the HA-95 group.
Yoshimi, Tomohisa, et al. “Effects of high-molecular-weight sodium hyaluronate on experimental osteoarthrosis induced by the resection of rabbit anterior cruciate ligament.” Clinical orthopaedics and related research 298 (1994): 296-304.
Clinical trial of intra-articular injection of sodium hyaluronate in patients with osteoarthritis of the knee
A multi-centre randomized, double-blind, parallel-group clinical trial was carried out in 63 patients with osteoarthritis of the knee to compare the efficacy and tolerability of a course of intra-articular injections of 20 mg sodium hyaluronate with a similar course of injections of placebo. Treatment consisted of up to 11 injections over a 23-week period. Evaluation was by means of subjective symptom and activity assessments, serially during the course of treatment and also 25 weeks thereafter. Ten patients (5 of 30 on active treatment; 5 of 33 on placebo) were withdrawn prematurely. Pain on movement, assessed by visual analogue scale (VAS) showed statistically significant (p<0.05 to p<0.0001) reductions in mean scores throughout the first 11 weeks of treatment with sodium hyaluronate but smaller, non-significant, reductions with placebo treatment. The difference between treatments was significant (p<0.05) at 5 weeks. Pain at rest, also assessed by VAS, showed little change in mean scores with placebo but with sodium hyaluronate there was a progressive reduction which was significant (p<0.01) throughout the period from 5 to 23 weeks. The difference between sodium hyaluronate and placebo was significant (p<0.05 to p<0.002) at Weeks 5, 11, 15, 19 and 23. ‘Activities of daily living’ were assessed using a standard scale. There were small improvements with both treatments, significant at some assessments and somewhat greater with sodium hyaluronate than placebo, but there were no statistically significant differences between the groups. One patient developed a haemarthrosis after sodium hyaluronate injection, which may have been treatment related. Increase in knee effusion volume and the development of phlebitis in 2 other patients were of uncertain relationship to sodium hyaluronate therapy. There were no other reports of local or systemic adverse reactions to sodium hyaluronate therapy and laboratory screening investigations revealed no evidence of toxicity. These results indicate that a course of intra-articular injections of sodium hyaluronate (20 mg) is generally well tolerated in patients with osteoarthritis of the knee and that it results in significant reductions in knee pain in such patients. Further studies should be undertaken to clarify the part that sodium hyaluronate has to play in the management of patients with osteoarthritis of major joints.
Dixon, A. St J., et al. “Clinical trial of intra-articular injection of sodium hyaluronate in patients with osteoarthritis of the knee.” Current medical research and opinion 11.4 (1988): 205-213. DOI:10.1185/03007998809114237
There is provided a clear antiperspirant/deodorant gel composition. The composition is a water-in-oil emulsion having a viscosity about 7,000 cps to about 25,000 cps and a clarity from about 30 NTU or less. The composition further has an antiperspirant active, water, silicone gelling agent, and one or more silicone oils.
Carmody, Walter J. “Clear antiperspirant or deodorant; water in oil emulsion including silicone gelling agent and silicone oils; soft, nonirratating feel to skin; using such as diazolidinyl or imidazolidinyl urea as formaldehyde donor.” U.S. Patent No. 6,468,512. 22 Oct. 2002.
Methylchloroisothiazolinone/Methylisothiazolinone (Kathon CG) Biocide: Second United States Multicenter Study of Human Skin Sensitization.
Background: This is the second United States multicenter study of human skin sensitization to methylchloroisothiazolinone/methylisothiazolinone (MCI/MI). From January 1991 through March 1992 patients treated in 11 patch test clinics were patch tested to 100 ppm MCI/MI, formaldehyde 1% aqueous, quaternium-15 2% petrolatum, imidazolidinyl urea 2% petrolatum, and paraben mix 12% petrolatum.
Results: Twenty-three of the 1,259 patch test patients (1.8%) had positive patch test reactions to MCI/MI. Thirteen of the 23 (56.5%) were thought to be relevant to the presenting dermatitis. The frequency of positive patch test reactions to the other allergens was quaternium-15, 7.2%; formaldehyde, 7.1%; imidazolidinyl urea, 2.2%; and paraben mix, 1.4%.
Conclusion: Skin sensitization to MCI/MI has not changed significantly since the first United States multicenter study in 1988 to 1989. The rate of positive patch test responses to MCI/MI was comparable with that for parabens and imidazolidinyl urea and significantly less than for formaldehyde and quaternium-15.
Marks Jr, James G., et al. “Methylchloroisothiazolinone/Methylisothiazolinone (Kathon CG) Biocide: Second United States Multicenter Study of Human Skin Sensitization.” Dermatitis 4.2 (1993): 87-89.
Dermatological compositions described herein using from about 21 to about 40 wt-% urea with skin protectants of an oleaginous nature for treating a variety of dermatological conditions manifested by dry skin. The composition does not require use of traditional preservatives.
Valdez, Vitalia, and Albert Fleischner. “21 to about 40 wt-% urea with skin protectants of an oleaginous nature for treating a variety of dermatological conditions manifested by dry skin. the composition does not require use of traditional preservatives.” U.S. Patent No. 5,919,470. 6 Jul. 1999.
Contact sensitivity to preservatives in the UK, 2004–2005: results of multicentre study
Preservative sensitivity in the UK was last assessed in 2000. Given the changes in preservative usage, we have re-evaluated our patch test data in order to detect any changes in the trend of sensitization. The results of patch testing using the extended British Contact Dermatitis Society Standard series were collected from 9 dermatology centres in the UK. Positive reactions to each of 10 preservative allergens were captured together with the MOAHFLA indices for each centre. In total, 6958 patients were tested during the period 2004–2005. The current data were compared with previously published data. Formaldehyde and methylchloroisothiazolinone/methyl-isothiazolinone have the highest positivity rates at 2.0% and chloroxylenol the lowest at 0.2%. Parabens mix has the highest irritancy rate. Compared with the UK data in 2000, the positivity rate of imidazolidinyl urea (0.02 < P < 0.05) has significantly increased and that of methyldibromo glutaronitrile has significantly reduced (P < 0.001).
Jong, Cherng T., et al. “Contact sensitivity to preservatives in the UK, 2004–2005: results of multicentre study.” Contact Dermatitis 57.3 (2007): 165-168. DOI: 10.1111/j.1600-0536.2007.01181.x
Skin cell renewal regime
A novel cell renewal cosmetic regime is disclosed, which increases epidermal cell turnover without skin irritation. The regime consists of the use of four components: a cleanser, a cream, a lotion, and a tonic.
Cella, John A., et al. “Skin cell renewal regime.” U.S. Patent No. 4,272,544. 9 Jun. 1981.
Patch testing with preservatives at St John’s from 1982 to 1993
We have reviewed our patch test results for preservative allergy from 1982 to W3. 8 preservatives were included: formaldehyde. 2-bromo-2-nitropropane-1,3-diol (Bronopol™), quatenium-15 (Dowicil 200™). Imidazolidinyl urea (Germall 115™). diazolidinyl urea (Germall 11™) and 1,2-dibromo-2,4-dicyanpbutane (one of the constituents of Euxyl K 400™). Whereas the allergy rate to formaldehyde is quite stable, there is a slight increase in the imidazolidinyl urea allergy rate to formaldehyde is quite stable, there is a slight increase in the imidazolidinyl urea allergy rate. Quaternium-15’s rate a rapid rise seems to have stabilized. Although very important constituents of cosmetics, preservatives not only induce allergies on the face but also on the hands, and, as expected, the allergy rate in men and women generally differs. Among the 5 formaldehyde-releasers, there are some favoured simultaneous reactions quaternium -15 and formaldehyde, and diazolidinyl urea or imidazolidinyl urea. Coccomitant reactions between 1-brome-2-nitropropane-1,3-diol and formaldehyde are not common, and those between 2-brome-2-nitropropane-1,3-diol and disazolidynl urea or imidazolidinyl urea very uncommon. Concomitant reactions between imidazolidinyl urea, diazolidinyl urea, and formaldehyde are not very common. This supports the hypothesis that allergic reactions to the Germalls are directed toward the initial molecule rather than to formaldehyde.
Jacobs, M‐C., et al. “Patch testing with preservatives at St John’s from 1982 to 1993.” Contact dermatitis 33.4 (1995): 247-254. DOI: 10.1111/j.1600-0536.1995.tb00476.x
Formaldehyde-releasers in cosmetics in the USA and in Europe
Background: Frequencies of sensitization to formaldehyde among US patients patch tested for suspected contact dermatitis are higher than in Europe. Cosmetics are an important source of contact with formaldehyde.
Objectives: To acquire data on the frequency of use of formaldehyde-releasers in cosmetics sold in the USA and Europe and their use concentrations. To assess whether any observed differences may contribute to the discrepancies in sensitization rates.
Methods: Enquiries with Food and Drug Administration (FDA), the European Cosmetics Association, and the Dutch Cosmetics Association. Reading the labels of skin care cosmetics in a local drugstore.
Results: The FDA provided data on the presence of formaldehyde and releasers. Nearly one fifth of all cosmetics contain a releaser. In 25% of 496 examined skin care products, releasers were present. In comparable FDA data categories, the percentage was 24. No data were found on use concentrations of the releasers in cosmetics in either the USA or Europe.
Conclusions: The percentages of stay-on skin care products containing a formaldehyde-releaser are virtually identical in the USA (FDA data) and our local drugstore sample. However, this does not necessarily imply that cosmetics play no part in the differences in formaldehyde sensitization rates.
De Groot, Anton C., and Margo Veenstra. “Formaldehyde‐releasers in cosmetics in the USA and in Europe.” Contact Dermatitis 62.4 (2010): 221-224. DOI: 10.1111/j.1600-0536.2009.01623.x
A method for quantification of formaldehyde in the presence of formaldehyde donors in skin-care products
Reliable and uncomplicated methods for detection of free formaldehyde in products preserved with formaldehyde donors are desirable to decrease the risk of allergic contact dermatitis. The aim of this study was to develop a method that could be used in clinics and workplaces for quantification of free formaldehyde in products preserved with formaldehyde donors. The method developed is named the closed container diffusion (CCD) method. Formaldehyde in a sample is allowed to evaporate in a closed container and react with 2,4-dinitrophenylhydrazine coated on a glass fibre filter. The hydrazone formed is analyzed with HPLC. The method was tested on 3 different formaldehyde donors, imidazolidinyl urea, diazolidinyl urea and 2-bromo-2-nitropropane-1,3-diol, using 4 different cream bases. The results obtained with this method accord with those obtained with the official method within the European Union (EU). The method is sensitive enough for analysis of patients’ products and for control of labelled amounts of formaldehyde in technical products without solvent extraction. As a result of our studies, we observed a risk of exceeding the labelling limit for free formaldehyde in cosmetic products when using the highest amount of diazolidinyl urea allowed within the EU.
Karlberg, Ann‐Therese, et al. “A method for quantification of formaldehyde in the presence of formaldehyde donors in skin‐care products.” Contact dermatitis 38.1 (1998): 20-28. DOI: 10.1111/j.1600-0536.1998.tb05632.x
Antiinflammatory skin moisturizing composition and method of preparing same
A long lasting, esthetically pleasing medicated skin care moisturizing composition comprising
an oil phase comprising oil from about 30% to about 80% and a non-ionic surface active agent having an HLB number of about 7 to about 12, wherein the non-ionic surface active agent is present in an amount of about 5% to about 9%;
an aqueous phase comprising an aqueous thickening agent from about 0.05% to about 5% and water from about 15% to about 65%;
an effective amount of a topical medicament; wherein the medicament is a corticosteroid and the oil phase is added to the aqueous phase to form an emulsion and a topical medicament admixed into the emulsion has been developed.
The method of preparation of the composition and a method of treating skin with the composition are also disclosed.
Geria, Navin M. “Antiinflammatory skin moisturizing composition and method of preparing same.” U.S. Patent No. 4,992,478. 12 Feb. 1991.
Sensitive-skin care regime
A method of decreasing the sensitivity of the skin without causing irritation is described, using a four component cosmetic regime. The four components comprising the regime are: a cleanser, a toner, a moisturizer, and a cream.
Flom, Merlyn G., et al. “Sensitive-skin care regime.” U.S. Patent No. 4,368,187. 11 Jan. 1983.
Algae Extract-Mediated Stimulation and Protection of Proteasome Activity Within Human Keratinocytes Exposed to UVA and UVB Irradiation
Sun exposure is the major environmental influence for epidermal cells; the harmful effect of UV radiation on skin is related to the generation of reactive oxygen species that alter cellular components including proteins. It is now well established that the proteasome is responsible for the degradation of most of oxidized proteins and that impairment of proteasome function is a hallmark of cellular aging. In a previous study, we investigated the effects of UV irradiation on proteasomes in human keratinocyte cultures and showed that all three peptidase activities were decreased 24 h after irradiation of the cells. Increased levels of oxidatively modified proteins were observed in irradiated cells and were found to act as endogenous inhibitors of the proteasome. We report here on the stimulating and protective effects of an algae extract, prepared from Phaeodactylum tricornutum, on proteasome peptidase activities of human keratinocytes exposed to UVA and UVB irradiation. In addition, preserving proteasome function resulted in lowering the extent of the irradiation-induced protein oxidative damage, opening up new strategies for protection of epidermal cells against the detrimental effects of UV irradiation.
Bulteau, Anne-Laure, et al. “Algae extract-mediated stimulation and protection of proteasome activity within human keratinocytes exposed to UVA and UVB irradiation.” Antioxidants & redox signaling 8.1-2 (2006): 136-143. doi:10.1089/ars.2006.8.136.
Algae Extract Protection Effect on Oxidized Protein Level in Human Stratum Corneum
Modification of proteins by reactive oxygen species is implicated in different disorders. The proteasome is a multicatalytic proteinase in charge of intracellular protein turnover and of oxidized proteins degradation. Consequently, proteasome function is very important in controlling the level of altered proteins in eukaryotic cells. Evidence for a decline in proteasome activity during skin photo-aging has been provided in Bulteau et al. in 2002. The ability of a lipid algae extract (Phaeodactylum tricornutum) to stimulate 20S proteasome peptidase activities was described by Nizard et al. in 2001. Furthermore, keratinocytes treated with Phaeodactylum tricornutum extract and then UVA and UVB irradiated, exhibited a sustained level of proteasome activitiy comparable to the one of nonirradiated cells. The level of modified proteins can be quantified by measurement of protein carbonyl content (Oxyblot technique), which has been shown to increase with aging and other disorders. In this paper, it is described that, in the presence of this lipid algae extract, the level of oxidized proteins is reduced, as assessed by the Oxyblot technique. These results are obtained both with culture of human keratinocytes and stratum corneum skin cells (obtained by stripping) from human volunteers. Altogether, these results argue for the presence of compounds in this algae extract that have a stimulating and/or protective effect on proteasome activity, resulting in a decreased level of protein oxidation.
NIZARD, CARINE, et al. “Algae extract protection effect on oxidized protein level in human stratum corneum.” Annals of the New York Academy of Sciences 1019.1 (2004): 219-222. DOI: 10.1196/annals.1297.036
Symptoms of hay fever caused by algae
A potent antigen was prepared from algae growing in a lake in Waukesha County, Wis.
This antigen elicited positive skin tests in an individual whose symptoms of hay fever were aggravated by swimming in that lake and in an individual who did not have pollinosis, but who likewise developed symptoms of hay fever.
Positive passive transfer tests to algae extract were obtained from one of the two patients.
The antigen was effective in the treatment of this allergic condition.
A specimen of algae preserved in formaldehyde retained a high titer of antigenicity for two and one-half years.
Heise, Herman A. “Symptoms of hay fever caused by algae.” Journal of Allergy 20.5 (1949): 383-385. doi:10.1016/0021-8707(49)90029-5
Respiratory allergy to algae: clinical aspects.
A comprehensive investigation was done to evaluate the allergenic algae in the Delhi area. Results of 4,000 skin tests performed on 400 patients suffering from naso-bronchial allergy and 300 skin tests on 30 healthy persons with 10 common algae isolated from the Dehli atmosphere are presented and compared. Positive skin reactions (1+ to 3+) to algae extracts ranged from 25.7% with Lyngbya major extract to 1.7% with Oscillatoria simplicissima extract; in healthy non-allergic volunteers there were no positive skin reactions. The Prausnitz-Küstner (PK), bronchial provocation and conjunctival tests were negative in patients with negative skin reactions; in patients with positive skin reactions PK was positive in 70.9%, bronchial provocation in 50% and conjunctival in 48.5%. Levels of total IgE in patients with naso-bronchial allergy were higher, ranging from 1,225 international units per ml to 1,550 international units per ml, while in healthy volunteers the values were less than 885 international units per ml.
Mittal, A., M. K. Agarwal, and D. N. Shivpuri. “Respiratory allergy to algae: clinical aspects.” Annals of allergy 42.4 (1979): 253-256.
Utilization of algae extract for the preparation of pharmaceutical, cosmetic, food or agricultural compositions
The present invention relates to the utilization of algae extracts obtained by extraction in liquid phase, or of at least one active substance isolated from such an extract or obtained by chemical synthesis, selected in particular among the fucols, polyfucols, diphloretols, polyphloretols, bifuhalols, polyfuhalols, phloretols, for the preparation of pharmaceutical, cosmetic, food or agricultural compositions with an anti-radical activity, particularly towards the superoxide radical. The algae used are brown, green or red macroscopic algae and in particular Fucus vesiculosus.
Briand, Xavier. “Antiradical activity towards superoxide radical.” U.S. Patent No. 5,508,033. 16 Apr. 1996.
Sensitivity of skin and bronchial mucosa to green algae
Six green algal strains were examined for their possible allergenicity to humans. Of 79 atopic patients tested with algal extracts, 47 gave positive skin tests. Non-atopic individuals showed no skin reactivity. Skin-sensitizing antibodies were passively transferred from 6 of 8 patients tested with Chlorella vulgaris. In the same group of patients, precipitating antibodies were not observed. Bronchial mucosal tests, evaluated by changes in the peak expiratory flow rate and by the appearance of clinical wheezing, were performed on 8 patients in whom cutaneous reactivity had been pronounced. Positive responses to acrosolized extracts of Chlorella vulgaris were obtained in 5 of these patients. These results suggest that positive skin tests to green algae are immunologically significant and that these organisms may be etiological agents in human respiratory allergies.
Bernstein, I. Leonard, and Robert S. Safferman. “Sensitivity of skin and bronchial mucosa to green algae.” Journal of Allergy 38.3 (1966): 166-173. doi:10.1016/0021-8707(66)90039-6
A high-SPF composition is provided which is quick drying, waterproof and anti-perspiration penetrating which after application rapidly is very dry and soft to the touch comprising a sunscreen with both UVA and UVB components, an algae extract and aloe vera, and tapioca powder. In a further example, an enhancing agent consisting of styrene acrylates copolymer is added.
Randall, William B., and Cary L. Prida. “Consists of ultraviolet radiation protecting agent benzophenone-3 and or butyl methoxydibenzoylmethane, copolymer of styrene-acrylate as enhancer, tapioca powder, and marine algae extract.” U.S. Patent No. 5,945,090. 31 Aug. 1999.
Pullulan content of the ethanol precipitate from fermented agro-industrial wastes
Ethanol-precipitated substances after fermentation of various
agro-industrial wastes by Aureobasidium pullulans were examined for their pullulan content. Grape skin pulp extract, starch waste, olive oil waste effluents and molasses served as substrates for the fermentation. A glucose-based defined medium was used for comparison purposes. Samples were analysed by an enzyme-coupled assay method and by high-performance anion-exchange chromatography with pulsed amperometric detection after enzymic hydrolysis with pullulanase. Fermentation of grape skin pulp extract gave 22.3 g l−1 ethanol precipitate, which was relatively pure pullulan (97.4% w/w) as assessed by the coupled-enzyme assay. Hydrolysed starch gave only 12.9 g l−1 ethanol precipitate, which increased to 30.8 g l−1 when the medium was supplemented with NH4NO3 and K2HPO4; this again was relatively pure pullulan (88.6% w/w). Molasses and olive oil wastes produced heterogeneous ethanol-precipitated substances containing small amounts of pullulan, even when supplemented with nitrogen and phosphate. Overall, grape skin pulp should be considered as the best substrate for pullulan production. Starch waste requires several hydrolyis steps to provide a usable carbon source, which reduces its economic attraction as an industrial process.
Israilides, C. J., et al. “Pullulan content of the ethanol precipitate from fermented agro-industrial wastes.” Applied Microbiology and Biotechnology 49.5 (1998): 613-617. DOI 10.1007/s002530051222http://onlinelibrary.wiley.com/doi/10.1002/mabi.201100180/abstract?userIsAuthenticated=false&deniedAccessCustomisedMessage=
Potential uses and applications of treated wine waste: a review
Recently, there has been an upsurge in the exploitation of the waste materials generated by the wine industry. Wine waste is characterised by the presence of natural antioxidants much safer than synthetic antioxidants. Wine waste-derived antioxidants have been recently used in the food industry. Moreover, wine waste can be potentially used as soil conditioner, as adsorbent for heavy metals, for fertiliser and for pullulan production. This review aims at presenting the most important and economically viable applications of treated wine waste.
Arvanitoyannis, Ioannis S., Demetrios Ladas, and Athanasios Mavromatis. “Potential uses and applications of treated wine waste: a review.” International journal of food science & technology 41.5 (2006): 475-487. DOI: 10.1111/j.1365-2621.2005.01111.x
Pullulan Hydrogels Improve Mesenchymal Stem Cell Delivery into High-Oxidative-Stress Wounds
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Cell-based therapies for wound repair are limited by inefficient delivery systems that fail to protect cells from the acute inflammatory environment. Here, a biomimetic hydrogel system is described that is based on the polymer pullulan, a carbohydrate glucan known to exhibit potent antioxidant capabilities. It is shown that pullulan hydrogels are an effective cell delivery system and improve mesenchymal stem cell survival and engraftment in high-oxidative-stress environments. The results suggest that glucan hydrogel systems may prove beneficial for progenitor-cell-based approaches to skin regeneration.
Wong, Victor W., et al. “Pullulan Hydrogels Improve Mesenchymal Stem Cell Delivery into High‐Oxidative‐Stress Wounds.” Macromolecular bioscience 11.11 (2011): 1458-1466. DOI: 10.1002/mabi.201100180
Engineered Pullulan–Collagen Composite Dermal Hydrogels Improve Early Cutaneous Wound Healing
New strategies for skin regeneration are needed to address the significant medical burden caused by cutaneous wounds and disease. In this study, pullulan–collagen composite hydrogel matrices were fabricated using a salt-induced phase inversion technique, resulting in a structured yet soft scaffold for skin engineering. Salt crystallization induced interconnected pore formation, and modification of collagen concentration permitted regulation of scaffold pore size. Hydrogel architecture recapitulated the reticular distribution of human dermal matrix while maintaining flexible properties essential for skin applications. In vitro, collagen hydrogel scaffolds retained their open porous architecture and viably sustained human fibroblasts and murine mesenchymal stem cells and endothelial cells. In vivo, hydrogel-treated murine excisional wounds demonstrated improved wound closure, which was associated with increased recruitment of stromal cells and formation of vascularized granulation tissue. In conclusion, salt-induced phase inversion techniques can be used to create modifiable pullulan–collagen composite dermal scaffolds that augment early wound healing. These novel biomatrices can potentially serve as a structured delivery template for cells and biomolecules in regenerative skin applications.
Wong, Victor W., et al. “Engineered pullulan–collagen composite dermal hydrogels improve early cutaneous wound healing.” Tissue Engineering Part A 17.5-6 (2010): 631-644.
Pullulan and polyvinyl alcohol based film forming compositions
Compositions for forming a peelable, cosmetic film on the skin of a subject are provided. The compositions provided contain 3 to 30 wt % pullulan and 3 to 30 wt % polyvinyl alcohol; wherein the combination of pullulan and polyvinyl alcohol constitute 6 to 33 wt % of the composition. The invention also relates to a method of forming a peelable, cosmetic film on the skin of a subject including applying a composition to the skin of the subject, wherein the composition contains 3 to 30 wt % pullulan and 3 to 30 wt % polyvinyl alcohol; wherein the combination of pullulan and polyvinyl alcohol constitute 6 to 33 wt % of the composition.
O’Halloran, David, and Yelena Zolotarsky. “Pullulan and polyvinyl alcohol based film forming compositions.” U.S. Patent Application No. 10/256,264.
Fluorophore-assisted carbohydrate electrophoresis (FACE) of oligosaccharides: efficiency of labelling and high-resolution separation
Reductive amination is a common technique for the derivatisation of reducing carbohydrates, thereby providing appropriate chromophores or fluorophores to overcome native detection deficiencies. Rarely, however, is the issue of labelling efficiency addressed for substrates larger than monosaccharides. Utilising a variety of radiolabelled synthetic maltooligosaccharides, we now present data on the APTS labelling efficiency for substrates up to an average degree of polymerization (dp) of 135. The labelling reaction was found to be highly reproducible and independent of average chain length between dp 3 and dp 135, with an average efficiency of 80%. Glucose (95%) and maltose (88%) were labelled more efficiently. In addition to this work, electrophoretic methodologies have been developed to aid the characterization of APTS-labelled oligosaccharide distributions across a wide range of chain lengths. Fluorescent imaging of polyacrylamide slab gels provides flexibility of gel format, and conditions that can be adapted to the resolution and quantification of short oligosaccharide populations (less than dp 30) or to enable the observation of polysaccharides. A capillary gel electrophoretic method was developed using laser–induced fluorescence (LIF) detection to fully resolve and quantify maltooligosaccharides up to approximately dp 100, a technique that finds particular use in the analysis of oligosaccharide distributions obtained from isoamylase debranching of the amylopectin component of starch. A comparison of data reproducibility across a range of chain lengths established the superiority of results obtained by the capillary gel electrophoretic method over a previously reported method involving DNA sequencer-mediated electrophoretic separation.
Yamaki, Kazuhiro, et al. “External skin care composition.” U.S. Patent No. 6,878,378. 12 Apr. 2005. doi:10.1016/S0008-6215(97)10085-4
Pullulan based film forming cosmetic compositions
Compositions for forming a visible and distinctive cosmetic film on the skin of a subject are provided. The compositions provided contain 3 to 15 wt % pullulan. The invention also relates to a method of forming a visible and distinctive cosmetic film on the skin of a subject including applying a composition to the skin of the subject, wherein the composition contains 3 to 15 wt % pullulan.
O’Halloran, David, and Yelena Zolotarsky. “Pullulan based film forming cosmetic compositions.” U.S. Patent Application No. 10/256,234.
The antimicrobial activity of pullulan film incorporated with meadowsweet flower extracts (Filipendulae ulmariae flos) on postharvest quality of apples
This study examined the antimicrobial activity of pullulan films with incorporated meadowsweet flower extracts (EMFs) and the effectiveness of these coatings in the prolonging of apple stability in various storage conditions. Pullulan was obtained from a batch culture of white mutant Aureobasidium pullulans B-1. The content of phenolic components in two extracts-water–ethanol (weEMF) and ethanol one (eEMF)-was compared using the HPLC method. Compared to eEMF, a significantly higher content was noted of phenolic acids and flavonoids in weEMF and its increased activity in inhibiting microorganism growth. Pullulan films with incorporated EMFs were obtained from the solutions to which they were added in concentrations of 3, 6, 9, 12 and 15%. These films were stable and homogenous, and to a higher degree inhibited the growth of tested bacteria than fungi. Apples of the Jonagored variety were coated with a pullulan coating containing 12% EMF. The pullulan coating with EMFs evened and unified the surface of apple skins. Pullulan coating with weEMF more effectively inhibited the growth of natural mesophilic microflora, the amount of which decreased by two logarithmic cycles at the end of storage. EMF addition to the coating significantly limited the growth of the Rhizopus arrhizus mold inoculated to the apples. EMF addition to pullulan coating did not affect color changes nor did apples loss weight during their storage. Pullulan coatings with incorporated EMFs may protect apple quality during their storage and turnover in various temperatures and time conditions.
Gniewosz, Małgorzata, et al. “The antimicrobial activity of pullulan film incorporated with meadowsweet flower extracts (Filipendulae ulmariae flos) on postharvest quality of apples.” Food Control 37 (2014): 351-361. doi:10.1016/j.foodcont.2013.09.049
Isolation and Properties of a Sialoglycoprotein from the Skin Mucus of the Stingray Dasyatis akajei
A sialoglycoprotein (SGP) has been purified from the skin mucus of the stingray Dasyatis akajei. SGP contained 22.1% (w/w) NeuAc, 24.4% GalNAc, 9.9% GlcNAc, 6.1% Gal, and 27% amino acids, and its average molecular weight (Mr) was estimated to be 500, 000. SGP was very rich in Thr (32 mol%) and Ser (12 mol%). Treatment of SGP with alkali (β-elimination of carbohydrate chains) result-ed in the destruction of 70% of Thr and Ser, indicating that the carbohydrate chains were attached through these amino acids. Exhaustive digestion of SGP by actinase yielded a highly glycosylated glycopeptide with Mr of 50, 000. Based on these results, it is assumed that a SGPmolecule bears more than 400 oligosaccharide chains which are attached to the Thr and Ser residues of the polypeptide backbone and spaced at an average of 3 amino acids apart.
Sumi, Toshihisa, et al. “Isolation and Properties of a Sialoglycoprotein from the Skin Mucus of the Stingray Dasyatis akajei.” Fisheries science 63.3 (1997): 453-458.
Citric Acid Increases Viable Epidermal Thickness and Glycosaminoglycan Content of Sundamaged Skin
background Recently, there has been an exponential increase in the use of alpha-hydroxy acids in dermatologic practice. Their inclusion in a myriad of cosmetic preparations underscores their popularity. Among the clinical effects of alpha-hydroxy acids are their ability to prevent the atropy resulting from potent topical corticosteroids, improve the appearance of photoaged skin, and correct disorders of keratinization. Despite this range of desirable effects, very little is known about the specific changes produced by various alpha-hydroxy acid preparations in the epidermis and dermal extracellular matrix. Previous work by others has demonstrated the ability of another alpha-hydroxy acid to increase viable epidermal thickness, and derma! glycosaminoglycans.
objective In this study, we examined the effect of 20% citric acid lotion, as compared with vehicle alone, on skin thickness. viable epidermal thickness, and dermal glycosaminoglycan constent. Biopsy samples were harvested after 3 months of treatment.
results Image analysis of biopsy sections revealed increases in viable epidermal thickness and dermal glycosaminoglycans in treated skin.
conclustions Topical citric acid produces changes similar to those observed in response to glycolic acid, ammonium lactate, and retinoic acid including increases in epidermal and dermal glycosaminoglycans and viable epidermal thickness. Further studies of citric acid and other alpha-hydroxy acids are warranted to clarify their clinical effects and mechanisms of action.
Bernstein, Eric F., et al. “Citric acid increases viable epidermal thickness and glycosaminoglycan content of sundamaged skin.” Dermatologic surgery 23.8 (1997): 689-694. DOI: 10.1111/j.1524-4725.1997.tb00391.x
Effects of α-hydroxy acids on photoaged skin: Apilot clinical, histologic, and ultrastructural study
Objective: Our purpose was to determine the effects of AHAs on photoaged human skin by clinical and microanalytic means.
Methods: Patients applied a lotion containing 25% glycolic, lactic, or citric acid to one forearmand a placebo lotion to the opposite forearm for an average of 6 months. Thickness of forearm skin was measured throughout the study. Biopsy specimens from both forearms were processed for analysis at the end of the study.
Results: Treatment with AHAs caused an approximate 25% increase in skin thickness. The epidermis was thicker and papillary dermal changes included increased thickness, increased acid mucopolysaccharides, improved quality of elastic fibers, and increased density of collagen. No inflammation was evident.
Conclusion: Treatment with AHAs produced significant reversal of epidermal and dermalmarkers of photoaging.
Ditre, Chérie M., et al. “Effects of α-hydroxy acids on photoaged skin: Apilot clinical, histologic, and ultrastructural study.” Journal of the American Academy of Dermatology 34.2 (1996): 187-195. doi:10.1016/S0190-9622(96)80110-1
Glycolic Acid Treatment Increases Type I Collagen mRNA and Hyaluronic Acid Content of Human Skin
Background. Chronic solar irradiation results in both morphologic and functional changes in affected skin. α-hydroxy acids, such as glycolic acid, have been shown to improve photodamaged skin.
Objective. To investigate alterations in collagen gene induction and epidermal and dermal hyaluronic acid production as a result of administered glycolic acid.
Methods. In this study we compared collagen gene expression from skin biopsy specimens, and epidermal and dermal hyaluronic acid immunohistochemical staining between glycolic acid-treated and vehicle-treated skin. Forearm skin was treated with 20% glycolic acid lotion or a lotion vehicle control twice a day for 3 months.
Results. Epidermal and dermal hyaluronic acid and collagen gene expression were all increased in glycolic acid-treated skin as compared to vehicle-treated controls.
Conclusion. Our data suggest that epidermal and dermal remodeling of the extracellular matrix results from glycolic acid treatment. Longer treatment intervals may result in collagen deposition as suggested by the measured increase in mRNA.
Bernstein, Eric F., et al. “Glycolic acid treatment increases type I collagen mRNA and hyaluronic acid content of human skin.” Dermatologic surgery 27.5 (2001): 429-433. DOI: 10.1046/j.1524-4725.2001.00234.x
Effects of alpha-hydroxy acids on the human skin of Japanese subjects: The rationale for chemical peeling
Alpha-hydroxy acid (AHA) agents, such as glycolic acid and lactic acid, have been used as therapeutic agents for more than a quarter of a century. Recently, they have been used as agents to rejuvenate photo-aged skin. It is believed that these AHA agents induce the epidermis to remodel and accelerate desquamation, thus exerting their therapeutic effects. In this study, we investigated the histological differences in skin treated with glycolic, lactic, citric and acetic acids once daily for 6 weeks. The melanin pigments in the basal layer were less prominent in the glycolic and lactic acid-treated skin than in the citric and acetic acid-treated skin. The melanin deposits in the horny layers were equal for all AHA. However, the melanin deposits in the squamous layers were less prominent in the glycolic and lactic acid-treated skins than in the citric and acetic acid-treated skins; this was analogous to observations of the basal layers. Collagen I and procollagen I were increased after treatment with glycolic, lactic and citric acid in the upper dermis, but were not increased with acetic acid treatment. However, the staining of the epidermis and dermis for matrix metalloproteinase-1 (MMP-1) after treatment was not significantly different among the agents. Our data suggest that longer treatment intervals with glycolic and lactic acid can cause improvements in both the epidermal and dermal components and support the usefulness of AHA for rejuvenating photo-damaged skin.
Yamamoto, Yuki, et al. “Effects of alpha‐hydroxy acids on the human skin of Japanese subjects: The rationale for chemical peeling.” The Journal of dermatology 33.1 (2006): 16-22. DOI: 10.1111/j.1346-8138.2006.00003.x
Treatment of skin keratoses with α-hydroxy acids and related compounds
Preventive as well as therapeutic treatment to alleviate the symptoms of skin keratoses consisting of topical application of a solution, gel, lotion, cream or ointment containing one or more of the α- or β-hydroxy acids or α-keto acids, esters thereof, and their amine salts is disclosed. The compounds include free acid or amine salt forms of α-hydroxy-butyric acid, α-hydroxyisobutyric acid, α-hydroxyisocaproic acid, α-hydroxyisovaleric, atrolactic acid, β-hydroxybutyric acid, β-phenyl lactic acid, β-phenylpyruvic acid, citric acid, ethyl pyruvate, galacturonic acid, glucoheptonic acid, glucoheptono 1,4-lactone, gluconic acid, gluconolactone, glucuronic acid, glucuronolactone, glycolic acid, isopropyl pyruvate, lactic acid, malic acid, mandelic acid, methyl pyruvate, mucic acid, pyruvic acid, saccharic acid, saccharic acid 1,4-lactone, tartaric acid, and tartronic acid. The therapeutic composition may include one or more of the compounds present in the total amount of from three to thirty percent. Topical application to affected areas has been found to achieve from substantial to complete remissions of the keratoses in humans.
Van Scott, Eugene J., and J. Yu Ruey. “Treatment of skin keratoses with α-hydroxy acids and related compounds.” U.S. Patent No. 4,234,599. 18 Nov. 1980.
The influence of different acids and pepsin on the extractability of collagen from the skin of Baltic cod (Gadus morhua)
Solutions of (0.5 M) citric, lactic and acetic acids and 0.15 M HCl were used for the extraction of collagen from the whole skins of Baltic cod (Gadus morhua). The extractions were performed at a temperature of 4 °C for 24, 48 and 72 h using a solid/solution ratio of 1:6 (w/v). Of the acids used, HCl was the least effective solvent for collagen. The maximal yield of collagen extracted with citric acid was 60%. Collagen extraction with acetic or lactic acid give a maximal yield of about 90% with HCl yielding of only 18%. After enzymatic treatment of cod skin the yield of protein extracted with HCl and citric acids increased to 40% and 20%, respectively. Collagen was completely solubilized under the same conditions in acetic and lactic acids. Electrophoretic analysis of collagens extracted in HCl and citric acids with enzymatic treatment proved that the isolated protein was denaturated. The solutions of acetic and lactic acids are solvents for native collagen.
Skierka, Elżbieta, and Maria Sadowska. “The influence of different acids and pepsin on the extractability of collagen from the skin of Baltic cod (Gadus morhua).” Food chemistry 105.3 (2007): 1302-1306. doi:10.1016/j.foodchem.2007.04.030
A biomarker that identifies senescent human cells in culture and in aging skin in vivo
Normal somatic cells invariably enter a state of irreversibly arrested growth and altered function after a finite number of divisions. This process, termed replicative senescence, is thought to be a tumor-suppressive mechanism and an underlying cause of aging. There is ample evidence that escape from senescence, or immortality, is important for malignant transformation. By contrast, the role of replicative senescence in organismic aging is controversial. Studies on cells cultured from donors of different ages, genetic backgrounds, or species suggest that senescence occurs in vivo and that organismic lifespan and cell replicative lifespan are under common genetic control. However, senescent cells cannot be distinguished from quiescent or terminally differentiated cells in tissues. Thus, evidence that senescent cells exist and accumulate with age in vivo is lacking. We show that several human cells express a beta-galactosidase, histochemically detectable at pH 6, upon senescence in culture. This marker was expressed by senescent, but not presenescent, fibroblasts and keratinocytes but was absent from quiescent fibroblasts and terminally differentiated keratinocytes. It was also absent from immortal cells but was induced by genetic manipulations that reversed immortality. In skin samples from human donors of different age, there was an age-dependent increase in this marker in dermal fibroblasts and epidermal keratinocytes. This marker provides in situ evidence that senescent cells may exist and accumulate with age in vivo.
Dimri, Goberdhan P., et al. “A biomarker that identifies senescent human cells in culture and in aging skin in vivo.” Proceedings of the National Academy of Sciences 92.20 (1995): 9363-9367.
Extracting Conditions for Megrim (Lepidorhombus boscii) Skin Collagen Affect Functional Properties of the Resulting Gelatin
Various procedures for extracting collagen and/or gelatin from megrim skins were compared on the basis of gelatin functional properties. It was possible to prepare a dry powder of soluble collagen with good viscoelastic and gelling properties, which can be converted into gelatin by dissolving at temperatures above 45 °C. Physical properties of gelatins are influenced more by extracting conditions than by imino acid composition. A high-quality, readily-dissolved gelatin was obtained from megrim skins using a pretreatment of the skins with NaCl and dilute NaOH, then swelling with 0.05 M acetic acid followed by an extraction step in water at 45 °C.
Montero, P., and M. C. Gómez‐Guillén. “Extracting conditions for megrim (Lepidorhombus boscii) skin collagen affect functional properties of the resulting gelatin.” Journal of Food Science 65.3 (2000): 434-438. DOI: 10.1111/j.1365-2621.2000.tb16022.x
A Metabonomic Strategy for the Detection of the Metabolic Effects of Chamomile (Matricaria recutita L.) Ingestion
A metabonomic strategy, utilizing high-resolution 1H NMR spectroscopy in conjunction with chemometric methods (discriminant analysis with orthogonal signal correction), has been applied to the study of human biological responses to chamomile tea ingestion. Daily urine samples were collected from volunteers during a 6-week period incorporating a 2-week baseline period, 2 weeks of daily chamomile tea ingestion, and a 2-week post-treatment phase. Although strong intersubject variation in metabolite profiles was observed, clear differentiation between the samples obtained before and after chamomile ingestion was achieved on the basis of increased urinary excretion of hippurate and glycine with depleted creatinine concentration. Samples obtained up to 2 weeks after daily chamomile intake formed an isolated cluster in the discriminant analysis map, from which it was inferred that the metabolic effects of chamomile ingestion were prolonged during the 2-week postdosing period. This study highlights the potential for metabonomic technology in the assessment of nutritional interventions, despite the high degree of variation from genetic and environmental sources.
Wang, Yulan, et al. “A metabonomic strategy for the detection of the metabolic effects of chamomile (Matricaria recutita L.) ingestion.” Journal of agricultural and food chemistry 53.2 (2005): 191-196. DOI: 10.1021/jf0403282
Chamomile: A herbal medicine of the past with a bright future
Chamomile is one of the most ancient medicinal herbs known to mankind. It is a member of the Asteraceae/Compositae family and is represented by two common varieties, German Chamomile (Chamomilla recutita) and Roman Chamomile (Chamaemelum nobile). The dried flowers of chamomile contain many terpenoids and flavonoids, which contribute to its medicinal properties. Chamomile preparations are commonly used for many human ailments, including hay fever, inflammation, muscle spasms, menstrual disorders, insomnia, ulcers, wounds, gastrointestinal disorders, rheumatic pain and hemorrhoids. Essential oils of chamomile are used extensively in cosmetics and aromatherapy. Numerous preparations of chamomile have been developed, the most popular being in the form of herbal tea, of which more than one million cups are consumed every day. In this review, we describe the use of chamomile in traditional medicine with regard to evaluating its curative and preventive properties, and highlight recent findings that may contribute to its development as a therapeutic agent promoting human health.
Srivastava, Janmejai K., Eswar Shankar, and Sanjay Gupta. “Chamomile: A herbal medicine of the past with a bright future (Review).” Molecular medicine reports 3.6 (2010): 895-901.
In vitro and in vivo studies of natural products: A challenge for their valuation. The case study of chamomile (Matricaria recutita L.)
Medicinal plant research is universally on the rise. Researchers, as well as the general public, recognize that natural products, predominantly those derived from plants, may exhibit health benefits. The tendency is to consider natural products as non-toxic and presenting fewer side effects than those used by conventional medicine. However, information concerning the real human health benefits of natural products is yet seldom available, which is a drawback for their possible valuation. Chamomile is one of the most widely used medicinal plants and its sesquiterpenic-related products are an example of this informative weakness. Several health benefits have been claimed for chamomile extracts and for a large number of sesquiterpenic compounds known to occur in chamomile. However, a deep knowledge concerning the compounds responsible for each specific effect, as well as the mechanisms behind them has not been stated, or, if it exists, is dispersed in literature. Thus, this review comprises a deep survey on the reported potential health benefits of chamomile-related sesquiterpenic compounds, and takes into account the models used for their evaluation: in vitro or in vivo. In spite of the relevance of the in vitro and animal studies reported in literature, where the data obtained are very promising concerning the potential health benefits of chamomile-related sesquiterpenic compounds, their extension to human trials is essential. Several aspects related to this actual challenge are discussed.
Petronilho, Sílvia, et al. “In vitro and in vivo studies of natural products: A challenge for their valuation. The case study of chamomile (Matricaria recutita L.).” Industrial Crops and Products 40 (2012): 1-12. doi:10.1016/j.indcrop.2012.02.041
Cosmeceuticals Containing Herbs: Fact, Fiction, and Future
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Background. Modern medicine is rooted in ethnobotanical traditions using indigenous flora to treat symptoms of human diseases or to improve specific aspects of the body condition. Herbal medicine is now used by over half of the American population. Yet the American medical community generally lacks knowledge of the function, metabolism, interaction, adverse reactions, and preparation of herbal products.
Objective. Because over 60 botanicals are marketed in cosmeceutical formulations, dermatologists need to obtain working knowledge of the major botanicals. The preparation, traditional uses, mechanisms of action, human clinical data, adverse reactions, and interactions all impact herbal efficacy and are discussed below.
Method. English-language medical journal and symposium searches.
Results. The most important botanicals pertaining to dermatologic uses, such as cosmeceuticals, include teas, soy, pomegranate, date, grape seed, Pycnogenol, horse chestnut, German chamomile, curcumin, comfrey, allantoin, and aloe. All are documented to treat dermatologic conditions. Only green and black tea, soy, pomegranate, and date have published clinical trials for the treatment of parameters of extrinsic aging.
Conclusions. Preparation of botanical-based cosmeceuticals is complex. Very few of these products are supported by evidence-based science.
Thornfeldt, Carl. “Cosmeceuticals containing herbs: fact, fiction, and future.” Dermatologic Surgery 31.s1 (2005): 873-881. DOI: 10.1111/j.1524-4725.2005.31734
Clinical cross-reactivity between Artemisia vulgaris and Matricaria chamomilla (chamomile).
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Artemisia vulgaris is a common weed and an important source of allergens on the subtropical island of Tenerife, Canary Islands, Spain. It pollinates mainly from July to September, although, due to some local climatic conditions, it may flower throughout the year. Cross-reactivity with hazelnut, kiwi, birch, several Compositae (Ambrosia, Chrysanthemum, Matricaria, Solidago) and grass allergens has been suggested. Few studies have addressed the issue of in vivo cross-reactivity between A. vulgaris and Matricaria chamomilla. The objective of this study was to perform conjunctival and bronchial challenges with A. vulgaris and M. chamomilla and oral challenge with chamomile in 24 patients with asthma and/or rhinitis sensitized primarily to A. vulgaris. Skin prick tests with M. chamomilla were positive in 21 patients. Eighteen patients had a positive conjunctival provocation test with a A. vulgaris pollen extract and 13 patients had a positive conjunctival provocation test with a M. chamomilla pollen extract. Bronchial provocation tests with A. vulgaris were positive in 15 patients and with M. chamomilla pollen in another 16 individuals. Oral provocation tests, conducted with a commercial chamomile infusion were positive in 13 patients. Nine of these individuals were skin test positive to food allergens and 17 to others pollens of the Compositae family. This study confirms a high degree of in vivo cross-reactivity between A. vulgaris and M. chamomilla. Sensitization to A. vulgaris seems to be a primary risk factor for experiencing symptoms after the ingestion of chamomile infusions. Based on the results of bronchial provocation tests, M. chamomilla pollen could be a relevant inhalant allergen.
de la Torre, Morín F., et al. “Clinical cross-reactivity between Artemisia vulgaris and Matricaria chamomilla (chamomile).” Journal of investigational allergology & clinical immunology 11.2 (2000): 118-122.
Antiproliferative and Apoptotic Effects of Chamomile Extract in Various Human Cancer Cells
Chamomile (Matricaria chamomilla), a popular herb valued for centuries as a traditional medicine, has been used to treat various human ailments; however, its anticancer activity is unknown. We evaluated the anticancer properties of aqueous and methanolic extracts of chamomile against various human cancer cell lines. Exposure of chamomile extracts caused minimal growth inhibitory responses in normal cells, whereas a significant decrease in cell viability was observed in various human cancer cell lines. Chamomile exposure resulted in differential apoptosis in cancer cells but not in normal cells at similar doses. HPLC analysis of chamomile extract confirmed apigenin 7-O-glucoside as the major constituent of chamomile; some minor glycoside components were also observed. Apigenin glucosides inhibited cancer cell growth but to a lesser extent than the parent aglycone, apigenin. Ex vivo experiments suggest that deconjugation of glycosides occurs in vivo to produce aglycone, especially in the small intestine. This study represents the first reported demonstration of the anticancer effects of chamomile. Further investigations of the mechanism of action of chamomile are warranted in evaluating the potential usefulness of this herbal remedy in the management of cancer patients.
Srivastava, Janmejai K., and Sanjay Gupta. “Antiproliferative and apoptotic effects of chamomile extract in various human cancer cells.” Journal of agricultural and food chemistry 55.23 (2007): 9470-9478. DOI: 10.1021/jf071953k
Passion Flower (Passiflora Incarnata) Extract
Preoperative Oral Passiflora Incarnata Reduces Anxiety in Ambulatory Surgery Patients: A Double-Blind, Placebo-Controlled Study
BACKGROUND: Many patients have preoperative anxiety; therefore, the development of a strong anxiolytic with minimal psychomotor impairment for premedication may be desirable.
METHODS: In this study, 60 patients were randomized into two groups to receive either oral Passiflora incarnata (500 mg, Passipy™ IranDarouk) (n = 30) or placebo (n = 30) as premedication, 90 min before surgery. A numerical rating scale (NRS) was used for each patient to assess anxiety and sedation before, and 10, 30, 60, and 90 min after premedication. Psychomotor function was assessed with the Trieger Dot Test and the Digit-Symbol Substitution Test at arrival in the operating room, 30 and 90 min after tracheal extubation. The time interval between arrival in the postanesthesia care unit and discharge to home (discharge time) was recorded for each patient.
RESULTS: The demographic characteristics of patients, ASA physical status, duration of surgery, basal NRS score, sedation at the preset time intervals, and discharge time were similar in the two groups. The NRS anxiety scores were significantly lower in the passiflora group than in the control group (P < 0.001). There were no significant differences in psychological variables in the postanesthesia care unit and recovery of psychomotor function was comparable in both groups.
CONCLUSIONS: In outpatient surgery, administration of oral Passiflora incarnata as a premedication reduces anxiety without inducing sedation.
Movafegh, Ali, et al. “Preoperative oral Passiflora incarnata reduces anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study.” Anesthesia & Analgesia 106.6 (2008): 1728-1732.
Antibacterial properties of Passiflora foetida L. – a common exotic medicinal plant
Passiflora foetida L. (stinking passion flower) is an exotic medicinal vine. The antibacterial properties of leaf and fruit (ethanol and acetone) extracts were screened against four human pathogenic bacteria i.e. Pseudomonas putida, Vibrio cholerae, Shigella flexneri and Streptococcus pyogenes by well-in agar method. The results showed the leaf extract having remarkable activity against all bacterial pathogens compared to fruits. This study supports, the traditional medicines (herbal extracts) to cure many
diseases like diarrhea, intestinal tract, throat, ear infections, fever and skin diseases.
Bewicke, Calverly M. “Dietary supplements containing kava root extract, passion flower, chamomile flowers, hops, and schizandra fruit.” U.S. Patent No. 5,770,207. 23 Jun. 1998.
Passionflower Fruit—A “New” Source of Lycopene?
Many population studies have established a link between dietary intake of the carotenoid antioxidant lycopene and a reduced risk of chronic diseases. Unlike most carotenoids, lycopene occurs in a few places in the diet. Besides tomatoes and tomato products, major sources of lycopene, other lycopene-rich foods include watermelon, pink grapefruit, pink guava, and papaya. Dried apricots and pureed rosehips contain relatively large amounts, too. In our study we found that passionflower fruit (skin and pericarp) contains a great amount of lycopene, whereas the content of other carotenoids is very low, and almost inexistent. This edible fruit could be an alternative source of a potential important nutrient for those people who do not eat tomatoes and tomato products.
Mourvaki, Evangelia, et al. “Passionflower fruit-a” new” source of lycopene?.” Journal of medicinal food 8.1 (2005): 104-106. doi:10.1089/jmf.2005.8.104.
High-Speed Extraction and HPLC Fingerprinting of Medicinal Plants – I. Application to Passiflora Flavonoids
An approach comprising accelerated solvent extraction followed by quantitative HPLC analysis has been adopted in fingerprinting 115 samples of different species of the genus Passiflora. The C-flavonoid glycosides schaftoside (1), isoschaftoside (2), isoorientin (3), orientin (4), isovitexin (5) and vitexin (6) were chosen as analytical standards and their overall prevalence in all samples was determined. The developed HPLC method utilizes gradient elution on an analytical Phenomenex Hypersil ODS column and UV detection at 280 nm. The availability of unique fingerprints, as well as quantitative data, for each species can provide a number of benefits including, but not limited to (a) authentication of samples, (b) determination of chemotaxonomic markers, (c) identification of constituent patterns related to specific geographical locations, (d) supportive data in genetic studies, (e) identifying possible substitutes for Passiflora incarnata, (f) differentiating between closely related species, and (g) relating biological activities to phytochemical profiles.
Rodriguez-Fragoso, Lourdes, et al. “Risks and benefits of commonly used herbal medicines in Mexico.” Toxicology and applied pharmacology 227.1 (2008): 125-135. DOI:10.1076/phbi.18.104.22.16844
Risks and benefits of commonly used herbal medicines in Mexico
In Mexico, local empirical knowledge about medicinal properties of plants is the basis for their use as home remedies. It is generally accepted by many people in Mexico and elsewhere in the world that beneficial medicinal effects can be obtained by ingesting plant products. In this review, we focus on the potential pharmacologic bases for herbal plant efficacy, but we also raise concerns about the safety of these agents, which have not been fully assessed. Although numerous randomized clinical trials of herbal medicines have been published and systematic reviews and meta-analyses of these studies are available, generalizations about the efficacy and safety of herbal medicines are clearly not possible. Recent publications have also highlighted the unintended consequences of herbal product use, including morbidity and mortality. It has been found that many phytochemicals have pharmacokinetic or pharmacodynamic interactions with drugs. The present review is limited to some herbal medicines that are native or cultivated in Mexico and that have significant use. We discuss the cultural uses, phytochemistry, pharmacological, and toxicological properties of the following plant species: nopal (Opuntia ficus), peppermint (Mentha piperita), chaparral (Larrea divaricata), dandlion (Taraxacum officinale), mullein (Verbascum densiflorum), chamomile (Matricaria recutita), nettle or stinging nettle (Urtica dioica), passionflower (Passiflora incarnata), linden flower (Tilia europea), and aloe (Aloe vera). We conclude that our knowledge of the therapeutic benefits and risks of some herbal medicines used in Mexico is still limited and efforts to elucidate them should be intensified.
Rodriguez-Fragoso, Lourdes, et al. “Risks and benefits of commonly used herbal medicines in Mexico.” Toxicology and applied pharmacology 227.1 (2008): 125-135. doi:10.1016/j.taap.2007.10.005
Passiflora incarnata L.: Ethnopharmacology, clinical application, safety and evaluation of clinical trials
The genus Passiflora incarnata Linnaeus comprises approximately 520 species belonging to the Passifloraceae family. The majority of these species are vines found in Central or South America, with rare occurrence in North America, Southeast Asia and Australia. The genus Passiflora incarnata has long been used in traditional herbal medicine for the treatment of insomnia and anxiety in Europe, and it has been used as a sedative tea in North America. Furthermore, this plant has been used for analgesic, anti-spasmodic, anti-asthmatic, wormicidal and sedative purposes in Brazil; as a sedative and narcotic in Iraq; and for the treatment of disorders such as dysmenorrhoea, epilepsy, insomnia, neurosis and neuralgia in Turkey. In Poland, this plant has been used to treat hysteria and neurasthenia; in America, it has been used to treat diarrhoea, dysmenorrhoea, neuralgia, burns, haemorrhoids and insomnia. Passiflora incarnata L. has also been used to cure subjects affected by opiate dependence in India. This review aims to provide up-to-date information about the pharmacology, clinical efficacy and clinical safety of Passiflora incarnata L. based on the scientific literature. In particular, the methodological accuracy of clinical trials is analysed in accordance with current consolidated guidelines on reporting the clinical efficacy of herbal medicine, offering new insight into opportunities for future research and development.
A bibliographic investigation was performed by examining the available data on Passiflora incarnata L. from globally accepted scientific databases and search engines (Pubmed, Scopus and Web of Science, SciFinder and Google Scholar). We selected studies, case reports, and reviews addressing the pharmacology and safety of Passiflora incarnata.
Although numerous Passiflora incarnata L. derivative products have been commercialised as alternative anxiolytic and sedative remedies based on their long tradition of use, their supposed efficacy does not appear to be adequately corroborated by the literature, with clinical studies often featuring inadequate methodologies and descriptions of the products under investigation. This medicinal plant has shown a wide spectrum of pharmacological activities in preclinical experiments, including anxiolytic, sedative, antitussive, antiasthmatic, and antidiabetic activities. The plant has a good safety profile. The clinical trials that we included in this review were designed to evaluate and in some cases confirm promising observations of preclinical pharmacological activity, and the methodological limits of these studies are characterised here.
In conclusion, clinical studies on the effects of products containing herbal preparations based on Passiflora incarnata reveal crucial weaknesses such as poor details regarding the drug extract ratio, limited patient samples, no description of blinding and randomisation procedures, incorrect definition of placebo, and lack of intention to treat analysis. In conclusion, the results of this review suggest that new clinical trials should be conducted using a more rigorous methodology to assess the traditional putative efficacy of Passiflora incarnata L.
Miroddi, M., et al. “Passiflora incarnata L.: ethnopharmacology, clinical application, safety and evaluation of clinical trials.” Journal of ethnopharmacology 150.3 (2013): 791-804. doi:10.1016/j.jep.2013.09.047
Passiflora incarnata Linneaus as an anxiolytic before spinal anesthesia
Patients who undergo regional anesthesia experience anxiety in the preoperative period. Passiflora incarnata Linneaus is a plant that has traditionally been used as an anxiolytic and sedative. We aimed to investigate the effect of preoperative oral administration of Passiflora incarnata Linneaus on anxiety, psychomotor functions, sedation, and hemodynamics in patients undergoing spinal anesthesia.
Under local ethics committee approval, 60 patients who were aged 25–55 years and ASAI–II and who were scheduled for spinal anesthesia were enrolled in this prospective, randomized, double-blind and placebo-controlled study. Thirty minutes before spinal anesthesia, baseline hemodynamic parameters, State-Trait Anxiety Inventory (STAI) score, sedation score, and psychomotor function test results were measured, then patients were randomly assigned to two groups: oral Passiflora incarnata Linneaus extract or placebo was given to the patients. Tests were repeated just before spinal anesthesia. Hemodynamics, sedation score, sensory-motor block and side effects were assessed during the operation. Psychomotor function tests were repeated at the end of the operation and 60 min after the operation.
There was a statistically significant difference between the two groups for the increase in State Anxiety Inventory (STAI-S) score obtained just before spinal anesthesia when compared to the baseline. There was no statistically significant difference in psychomotor function from the baseline for either group. A significant difference was not found between the two groups in demographics, psychomotor function, sedation score, hemodynamics, and side effects.
Oral preoperative administration of Passiflora incarnata Linneaus suppresses the increase in anxiety before spinal anesthesia without changing psychomotor function test results, sedation level, or hemodynamics.
Aslanargun, Pınar, et al. “Passiflora incarnata Linneaus as an anxiolytic before spinal anesthesia.” Journal of anesthesia 26.1 (2012): 39-44. DOI
Herbals in the control of ageing
The significance of herbals and herbal products is gaining worldwide recognition. The concept of complementary or alternative medicine is becoming much more widely accepted, and there is an increasing belief in the efficacy of herbal remedies. Recently, the role of herbal drugs, herbal products and certain phytochemicals in the control of ageing has been documented using modern scientific approaches. This review pulls together such studies and critiques the efficacy and value of herbal medicines in the control of the ageing process.
Kapoor, Vijay K., Janhvi Dureja, and Renu Chadha. “Herbals in the control of ageing.” Drug discovery today 14.19 (2009): 992-998. doi:10.1016/j.drudis.2009.06.014
Nervine Herbs for Treating Anxiety
Anxiety is a common ailment in our society. However, the drugs available to treat mild-to-moderate anxiety, particularly benzodiazepines, are problematic because they can cause injury, produce side-effects, and create dependence. Nervine herbs have been widely used historically to treat mildto- moderate cases of anxiety, and these herbs appear to be very safe, nonaddictive but their properties as anxiolytics have been poorly researched.
This article discusses the clinical uses of a number of nervines: oat seed (Avena spp.), hawthorn (Crataegus spp.), California poppy (Eschscholzia californica), lavender (Lavandula spp.), chamomile (Matricaria recutita), lemonbalm (Melissa officinalis), passionflower (Passiflora spp.), skullcap (Scutellaria lateriflora), and verbena (also called vervain; Verbena spp.).
Abascal, Kathy, and Eric Yarnell. “Nervine herbs for treating anxiety.” Alternative & Complementary Therapies 10.6 (2004): 309-315. doi:10.1089/act.2004.10.309.
Hydrolyzed Silk Protein
Applications of natural silk protein sericin in biomaterials
Silk sericin is a natural macromolecular protein derived from silkworm Bombyx mori. During the various stages of producing raw silk and textile, sericin can be recovered for other uses. Also, sericin recovery reduces the environmental impact of silk manufacture. Sericin protein is useful because of its properties. The protein resists oxidation, is antibacterial, UV resistant, and absorbs and releases moisture easily. Sericin protein can be cross-linked, copolymerized, and blended with other macromolecular materials, especially artificial polymers, to produce materials with improved properties. The protein is also used as an improving reagent or a coating material for natural and artificial fibers, fabrics, and articles. The materials modified with sericin and sericin composites are useful as degradable biomaterials, biomedical materials, polymers for forming articles, functional membranes,
fibers, and fabrics.
Zhang, Yu-Qing. “Applications of natural silk protein sericin in biomaterials.” Biotechnology advances 20.2 (2002): 91-100. doi:10.1016/S0734-9750(02)00003-4
Silk protein treatment composition and treated substrate for transfer to skin
The present invention relates to a topical delivery system effective in depositing a thin, tenacious and substantially continuous coating of a silk protein on skin by an aqueous emulsion mediated dissolution of protein from a substrate with subsequent transfer and deposition onto the skin. Coatings of silk protein on skin resist removal, thereby providing a protective barrier against chemically- and biochemically-induced skin damage. The treatment composition also provides a vehicle for administering an effective dose of an active agent to the skin surface.
Everhart, Dennis Stein, et al. “Silk protein treatment composition and treated substrate for transfer to skin.” U.S. Patent No. 6,497,893. 24 Dec. 2002.
Attachment and growth of cultured fibroblast cells on silk protein matrices
The attachment and growth of L-929 cells on films made of Bombyx mori silk proteins—fibroin and sericin and their mixtures—was studied by a cell culture method. Both cell attachment and growth were dependent on a minimum of around 90% sericin in the mixture. The results from electron micrography as well as from the DSC measurements supported the notion that the mixture of the two proteins fibroin and sericin has a phase-separated structure in the solid state. The observed minimum of sericin in the cell attachment and growth is thought to be a result of this phase-separated structure. Films of pure component proteins (i.e., 100% fibroin or sericin) exhibited as high a cell attachment and growth as collagen, a widely used mammalian cell culture substrate. However, a morphological study of the attached cells revealed that the cells attached to silk fibroin were extended and had a spindle shape, just like the cells attached to collagen, while the cells attached to the silk sericin had a different shape. It is concluded, therefore, that the attachment condition on silk fibroin is ideal for the viability, growth and function of the cells. © 1995 John Wiley & Sons, Inc.
Minoura, Norihiko, et al. “Attachment and growth of cultured fibroblast cells on silk protein matrices.” Journal of biomedical materials research 29.10 (1995): 1215-1221. DOI: 10.1002/jbm.820291008
Silk as a biomaterial
Silks are fibrous proteins with remarkable mechanical properties produced in fiber form by silkworms and spiders. Silk fibers in the form of sutures have been used for centuries. Recently regenerated silk solutions have been used to form a variety of biomaterials, such as gels, sponges and films, for medical applications. Silks can be chemically modified through amino acid side chains to alter surface properties or to immobilize cellular growth factors. Molecular engineering of silk sequences has been used to modify silks with specific features, such as cell recognition or mineralization. The degradability of silk biomaterials can be related to the mode of processing and the corresponding content of β-sheet crystallinity. Several primary cells and cell lines have been successfully grown on different silk biomaterials to demonstrate a range of biological outcomes. Silk biomaterials are biocompatible when studied in vitro and in vivo. Silk scaffolds have been successfully used in wound healing and in tissue engineering of bone, cartilage, tendon and ligament tissues.
Vepari, Charu, and David L. Kaplan. “Silk as a biomaterial.” Progress in polymer science 32.8 (2007): 991-1007. doi:10.1016/j.progpolymsci.2007.05.013
Preparation of silk protein sericin as mitogenic factor for better mammalian cell culture
We previously reported that sericin small (sericin-S), with a molecular weight that ranges from 5 to 100 kDa, is a cell culture supplement used to accelerate cell proliferation. In this study, a novel preparation method for sericin and several applications of sericin were examined. Sericin large, prepared under nonhydrolyzing conditions and ranging from 50 to 200 kDa, also accelerated cell proliferation, but its effects were inferior to those of sericin-S. Additional sericin preparations with various molecular weights that were differentially hydrolyzed were also tested but none of them was significantly superior to sericin-S, and neither were several recombinant sericin peptides. Sericin-S successfully accelerated the proliferation of hybridoma cells in various serum-free media, implying the mitogenic effect of sericin is independent from media. We also demonstrated that sericin-S successfully induced the proliferation of CTLL-2, an established T lymphocyte cell line, under IL-2 starvation conditions. These results indicate that sericin, particularly sericin-S, improves serum-free mammalian cell culture.
Terada, Satoshi, et al. “Preparation of silk protein sericin as mitogenic factor for better mammalian cell culture.” Journal of bioscience and bioengineering 100.6 (2005): 667-671. doi:10.1263/jbb.100.667
Skin care preparation
This invention provides skin care compositions which include an emollient complex containing a primary moisturizing agent selected from certain carboxylic acid amides and a mucopolysaccharide secondary moisturizing agent. The compositions also include one or more skin-structuring proteins and an astringent agent which confers skin-firming characteristics. Long lasting protection is afforded by the optional incorporation of a cellulosic film-former. Preferred embodiments take the form of two discrete gel phases.
Schneider, Emil, and James J. Ferone. “Carboxylic acid amide and mucopolysaccharide moisturizers.” U.S. Patent No. 4,973,473. 27 Nov. 1990.
Covalent bonding of active agents to skin, hair or nails
Transglutaminase crosslinks proteins by catalyzing the formation of isopeptide bonds between lysine and glutamine residues. Transglutaminase may be used to crosslink beneficial actives containing an amine moiety to glutamine residues in skin, hair or nails. A variety of beneficial actives, e.g., sunscreens, antimicrobial compounds, skin conditioning agents, hair conditioning agents, anti-inflammatory compounds, antioxidants, coloring agents, perfumes, insect repellants, can thus be delivered to human skin, hair, or nails.
Richardson, Norman K., et al. “Transglutaminase crosslinks proteins by catalyzing the active ingrediants to glutamine residues.” U.S. Patent No. 5,490,980. 13 Feb. 1996.
Retinol Palmitate (Vitamin A Palmitate)
Topical skin cream composition
In a preferred embodiment, a formulation for the treatment of aging skin in which the major active ingredient is glycolic acid in a concentration of from an effective amount up to about 3.5 weight percent. Other active ingredients may be vitamin A palmitate and/or vitamin E acetate. The active ingredients are provided in a moisturizing cream base which has beneficial effects in itself. Preservatives are also provided in the formulation to increase the shelf life thereof.
Jaffery, Manzoor H. “Mixture of carboxy acids, Vitamin A palmitate, Vitamin E acetate, lubricants, humectants for aging skin.” U.S. Patent No. 5,153,230. 6 Oct. 1992.
Characterization of Esterase and Alcohol Dehydrogenase Activity in Skin. Metabolism of Retinyl Palmitate to Retinol (Vitamin A) During Percutaneous Absorption
Retinyl palmitate, a widely used ingredient in cosmetic products, is promoted for its beneficial effects on the appearance of skin. Previous studies suggest that enzymes are available in skin to metabolize this ingredient during skin absorption. Esterase activity hydrolyzes retinyl palmitate to retinol (vitamin A), which is oxidized in many tissues to retinoic acid primarily by alcohol dehydrogenase. The activities of esterase and alcohol dehydrogenase were characterized in hairless guinea pig skin by using flow-through diffusion cells and radiolabeled model compounds (methyl salicylate and benzyl alcohol) previously shown to be metabolized by these enzymes. Methyl salicylate was hydrolyzed by esterase to a greater extent in viable skin than in nonviable skin. Glycine conjugation of salicylic acid and benzoic acid occurred only in viable skin. The metabolism of methyl salicylate and benzyl alcohol occurred to a greater extent in male guinea pig skin than in female guinea pig skin. The percutaneous absorption of both radiolabeled compounds was similar in viable and nonviable skin. About 30 and 18% of topically applied retinyl palmitate were absorbed from an acetone vehicle by hairless guinea pig skin and human skin, respectively. Less than 1% of the applied dose of this lipophilic compound diffused from skin into the receptor fluid. Retinol was the only detectable metabolite of retinyl palmitate in both hairless guinea pig and human skin. In human skin, 44% of the absorbed retinyl palmitate was hydrolyzed to retinol. The use of retinyl palmitate in cosmetic formulations may result in significant delivery of retinol into the skin.
percutaneous absorption metabolism retinyl palmitate hairless guinea pig
Boehnlein, James, et al. “Characterization of esterase and alcohol dehydrogenase activity in skin. Metabolism of retinyl palmitate to retinol (vitamin A) during percutaneous absorption.” Pharmaceutical research 11.8 (1994): 1155-1159. DOI 10.1023/A:1018941016563
Vitamin A loaded solid lipid nanoparticles for topical use: occlusive properties and drug targeting to the upper skin
To evaluate the potential use of solid lipid nanoparticles (SLN) in dermatology and cosm
etics, glyceryl behenate SLN loaded with vitamin A (retinol and retinyl palmitate) and incorporated in a hydrogel and o/w-cream were tested with respect to their influence on drug penetration into porcine skin. Conventional formulations served for comparison. Excised full thickness skin was mounted in Franz diffusion cells and the formulations were applied for 6 and 24 h, respectively. Vitamin A concentrations in the skin tissue suggested a certain drug localizing effect. High retinol concentrations were found in the upper skin layers following SLN preparations, whereas the deeper regions showed only very low vitamin A levels. Because of a polymorphic transition of the lipid carrier with subsequent drug expulsion following the application to the skin, the drug localizing action appears to be limited for 6–24 h. Best results were obtained with retinol SLN incorporated in the oil-in-water (o/w) cream retarding drug expulsion. The penetration of the occlusion sensitive drug retinyl palmitate was even more influenced by SLN incorporation. Transepidermal water loss (TEWL) and the influence of drug free SLN on retinyl palmitate uptake exclude pronounced occlusive effects. Therefore enhanced retinyl palmitate uptake should derive from specific SLN effects and is not due to non-specific occlusive properties.
Jenning, Volkhard, et al. “Vitamin A loaded solid lipid nanoparticles for topical use: occlusive properties and drug targeting to the upper skin.” European Journal of Pharmaceutics and Biopharmaceutics 49.3 (2000): 211-218. doi:10.1016/S0939-6411(99)00075-2
Unoccluded Retinol Penetrates Human Skin In Vivo More Effectively Than Unoccluded Retinyl Palmitate or Retinoic Acid
The formation of all-trans retinoic acid is an oxidative process whereby retinol is converted to retinaldehyde and then to retinoic acid. Because retinol causes qualitative molecular changes similar to those produced by retinoic acid, we compared potency of retinol, retinaldehyde, and retinyl palmitate to retinoic acid and assessed the effects of occlusion. Retinoids were prepared in an experimental vehicle of 95% ethanol:propylene glycol (7:3) with anti-oxidant. Induction of retinoic acid 4-hydroxylase activity was the end point for comparison. Retinoic acid concentrations from 0.001% to 0.05% under occlusion produced a linear dose-response induction of 4-hydroxylase activity. The concentrations of the other retinoids under occlusion required to achieve significant induction of enzyme activity were 0.6% retinyl palmitate, 0.025% retinol, and 0.01% retinaldehyde. The linear dose-response was lost with retinoid concentrations in excess of 0.25% retinol or 0.5% retinaldehyde. Statistical analyses showed no difference in 4-hydroxylase activity between unocciuded and occluded retinol treated sites. By contrast, however, unoccluded sites treated with retinoic acid or retinyl palmitate had less induction of 4-hydroxylase activity than occluded sites. Retinol, retinaldehyde, and retinyl palmitate did not produce erythema but did increase epidermal thickness. Although retinol is a weaker retinoid than retinoic acid, the increased penetration of unoccluded retinol in comparison to unoccluded retinoic acid with this prototypic vehicle confers on retinol a more effective delivery of a retinoidal effect than unocciuded retinoic acid. Retinol at 0.25% may be a useful retinoid for application without occlusion because it does not irritate but does induce cellular and molecular changes similar to those observed with application of 0.025% retinoic acid.
Duell, Elizabeth A., Sewon Kang, and John J. Voant epithelial tumors by vitamin A acid (retinoic acid)
Vitamin A and vitamin A palmitate stability over time and under UVA and UVB radiation
Vitamin A and vitamin A palmitate photostability were tested in different media. Ethanol and octyl octanoate solutions of these two vitamins, as such and with the addition of sunscreens (3,4 methylbenzilidencanfora, butyl methoxy dibenzoylmethane and octyl methoxycinnamate) or β-carotene and butylated hydroxy toluene, were analysed spectrophotometrically after UVB or UVA irradiation. An O/W fluid emulsion with 0.5% w/w of retinyl palmitate, with and without butylated hydroxy toluene, was prepared. The oil containing the vitamin was extracted with HCl and aluminium sulfate and analysed spectrophotometrically after UVB or UVA irradiation. The fluid emulsion containing retinyl palmitate with and without butylated hydroxy toluene was stored at different temperatures and analysed every week spectrophotometrically for a month. Of the sunscreens tested butyl methoxy dibenzoylmethane showed the strongest protective action towards vitamin A and vitamin A palmitate, whereas β-carotene did not protect either vitamin. Butylated hydroxy toluene inhibited the photodegradation of both vitamins dissolved in octyl octanoate, suggesting that oxygen may be involved in their degradation. O/W emulsion promoted slightly the degradation of vitamin A ester. Butylated hydroxy toluene protected retinyl palmitate from degradation induced by light and heat.
Carlotti, M. E., V. Rossatto, and M. Gallarate. “Vitamin A and vitamin A palmitate stability over time and under UVA and UVB radiation.” International journal of pharmaceutics 240.1 (2002): 85-94. doi:10.1016/S0378-5173(02)00128-X
A Prospective, Randomized, Double-Blind, Placebo-Controlled Trial of Retinol Palmitate (Vitamin A) for Symptomatic Chronic Radiation Proctopathy
This study was designed to determine whether oral retinol palmitate (vitamin A) can reduce the symptoms of radiation proctopathy.
A randomized, double-blind trial comparing retinol palmitate (10,000 IU by mouth for 90 days) to placebo was conducted. Eligible patients were more than six months postpelvic radiotherapy and had significant symptoms as measured with the Radiation Proctopathy System Assessments Scale. Nineteen patients were randomized in total: ten to retinol palmitate and nine to placebo. The Radiation Proctopathy System Assessments Scale scores before and every 30 days for 90 days were measured. Five placebo nonresponders were crossed over to the retinol palmitate for another 90 days. Response was defined as a reduction in two or more symptoms by at least two Radiation Proctopathy System Assessments Scale points.
Seven of ten retinol palmitate patients responded, whereas two of nine responded to placebo (P = 0.057). Mean pre-post-treatment change in Radiation Proctopathy System Assessments Scale (Δ Radiation Proctopathy System Assessments Scale) in the retinol palmitate group was 11 ± 5, whereas Δ Radiation Proctopathy System Assessments Scale in the placebo group was 2.5 ± 3.6 (P = 0.013, Mann-Whitney U test). Additionally, all five placebo nonresponders who were crossed over to treatment with retinal palmitate responded to treatment.
In our trial, retinol palmitate significantly reduced rectal symptoms of radiation proctopathy, perhaps because of wound-healing effects. The current results can serve as the foundation for future trials examining retinol palmitate in the multi-institutional setting.
Ehrenpreis, Eli D., et al. “A prospective, randomized, double-blind, placebo-controlled trial of retinol palmitate (vitamin A) for symptomatic chronic radiation proctopathy.” Diseases of the colon & rectum 48.1 (2005): 1-8. DOI 10.1007/s10350-004-0821-7
Aloe Vera Gel
The Effect of Aloe Vera Gel/Mild Soap Versus Mild Soap Alone in Preventing Skin Reactions in Patients Undergoing Radiation Therapy.
Purpose/Objectives: To determine whether the use of mild soap and aloe vera gel versus mild soap alone would decrease the incidence of skin reactions in patients undergoing radiation therapy. Data Sources: Prospective, randomized, blinded clinical trial. Setting: Radiation therapy outpatient clinic in a cancer center affiliated with a major teaching medical facility. Sample: The mean age of the participants was 56 years. The group consisted of Caucasians (74%) and African Americans (26%). The ethnic mix was non-Hispanic (65%) and Hispanic (35%). Methods: Prophylactic skin care began on the first day of radiation therapy. Patients cleansed the area with mild, unscented soap. Patients randomized into the experimental arm of the trial were instructed to liberally apply aloe vera gel to the area at various intervals throughout the day. Findings: At low cumulative dose levels =2,700 cGy, no difference existed in the effect of adding aloe. When the cumulative dose was high (> 2,700 cGy), the median time was five weeks prior to any skin changes in the aloe/soap arm versus three weeks in the soap only arm. When the cumulative dose increases over time, there seems to be a protective effect of adding aloe to the soap regimen. Implications for Nursing Practice: Skin products used to treat radiation dermatitis vary among institutions. Nurses should be aware that some patients may be predisposed to skin problems. Nurses must be aware of newly developed products and research regarding these products so that effective treatment can be instituted.
Olsen, Deborah Lee, et al. “The effect of aloe vera gel/mild soap versus mild soap alone in preventing skin reactions in patients undergoing radiation therapy.” Oncology nursing forum. Vol. 28. No. 3. 2001.
Evaluation of aloe vera gel gloves in the treatment of dry skin associated with occupational exposure
Objective: An examination glove that delivers aloe vera (AV) gel to the gloved hand was studied in 30 adult females with bilateral occupational dry skin with or without irritant contact dermatitis (with or without erythema, fissures, and excoriations). Methods: All participants were factory assembly-line workers with repeated superficial skin trauma who attributed their dry, irritated, emollient-dependent skin to a common cause (occupational exposure). Participants were sequentially enrolled (after written informed consent, n = 29 evaluable participants) into an open, contralateral comparison study to evaluate efficacy of AV glove use 8 h/day to one hand versus no use to the opposite hand for 30 days, followed by 30 days rest, followed by 10 days of repeated use. Participant’s dorsal hands were documented by standardized photos at baseline, during, and at the end of study. Results: Unblinded investigator baseline assessment rated dry skin as mild to moderate (n = 27), or moderate to severe (n = 2). Mean time to noticeable improvement for the AV glove hand was 3.5 days (range: 2-6 days) whereas marked improvement was 10.4 days (range: 7-17 days) for the AV glove hand. No improvement was detected for nonglove hands. Blinded photo assessment was rated independently by dermatology research staff. End-of-study mean global assessment of AV glove hands versus nonglove hands was 1.3 for AV glove hand (0 = no change, 1 = good [10%-89% global improvement], 2 = marked improvement [90%-100% global improvement]) versus 0 for nonglove hand (P <.0001). Mean global end-of-study assessments by the participants = 2.0 for AV glove hand versus 0 for nonglove hand. Conclusion: Dry-coated AV gloves that provide for gradual delivery of AV gel to skin produced a uniformly positive outcome of improved skin integrity, decreased appearance of fine wrinkling, and decreased erythema in the management of occupational dry skin and irritant contact dermatitis. (Am J Infect Control 2003;31:40-2.)
West, Dennis P., and Ya Fen Zhu. “Evaluation of aloe vera gel gloves in the treatment of dry skin associated with occupational exposure.” American Journal of Infection Control 31.1 (2003): 40-42. doi:10.1067/mic.2003.12
The Stimulation of Postdermabrasion Wound Healing with Stabilized Aloe Vera Gel-Polyethylene Oxide Dressing
Full-face dermabrasion provided an ideal opportunity to document the effects of dressings on wound healing management. Following the procedure, the abraded face was divided in half. One side was treated with the standard polyethylene oxide gel wound dressings. The other side was treated with a polyethylene oxide gel dressing saturated with stabilized aloe vera. The polyethylene oxide dressing provided an excellent matrix for the release of aloe vera gel during the initial 5 days of wound healing. By 24–48 hours there was dramatic vasoconstriction and accompanying reduction in edema on the aloe-treated side. By the third to fourth day there was less exudate and crusting at the aloe site, and by the fifth to sixth day the reepithelialization at the aloe site was complete. Overall, wound healing was approximately 72 hours faster at the aloe site. This acceleration in wound healing is important to reduce bacterial contamination, subsequent keloid formation, and/or pigmentary changes. The exact mechanism of acceleration of wound healing by aloe vera is unknown.
FULTON, JAMES E. “The Stimulation of Postdermabrasion Wound Healing with Stabilized Aloe Vera Gel‐Polyethylene Oxide Dressing.” The Journal of dermatologic surgery and oncology 16.5 (1990): 460-467. DOI: 10.1111/j.1524-4725.1990.tb00065.x
Aloe vera leaf gel: a review update
Research since the 1986 review has largely upheld the therapeutic claims made in the earlier papers and indeed extended them into other areas. Treatment of inflammation is still the key effect for most types of healing but it is now realized that this is a complex process and that many of its constituent processes may be addressed in different ways by different gel components. A common theme running though much recent research is the immunomodulatory properties of the gel polysaccharides, especially the acetylated mannans from Aloe vera, which are now a proprietary substance covered by many patents. There have also been, however, persistent reports of active glycoprotein fractions from both Aloe vera and Aloe arborescens. There are also cautionary investigations warning of possible allergic effects on some patients. Reports also describe antidiabetic, anticancer and antibiotic activities, so we may expect to see a widening use of aloe gel. Several reputable suppliers produce a stabilized aloe gel for use as itself or in formulations and there may be moves towards isolating and eventually providing verified active ingredients in dosable quantities
Reynolds, T., and A. C. Dweck. “Aloe vera leaf gel: a review update.” Journal of ethnopharmacology 68.1 (1999): 3-37. doi:10.1016/S0378-8741(99)00085-9
Investigation of the Anti-Inflammatory Potential of Aloe vera Gel (97.5%) in the Ultraviolet Erythema Test
Background:Aloe vera is a natural product that is frequently used in soothing skin care products such as aftersun lotions. In the present study we aimed to explore the anti-inflammatory potential of a highly concentrated A. vera gel in the UV erythema test in vivo. Methods: 40 volunteers with skin types II and III were included in the randomized, double-blind, placebo-controlled, phase III monocenter study. Test areas on the back were irradiated with the 1.5-fold minimal erythema dose of UVB. Subsequently, the test areas were treated occlusively on 2 subsequent days with A. vera gel (97.5%), the positive controls (0.25% prednicarbate, 1% hydrocortisone in placebo gel and 1% hydrocortisone cream) and a placebo gel. Erythema values were determined photometrically after 24 and 48 h. Results:A. vera gel (97.5%) significantly reduced UV-induced erythema after 48 h, being superior to 1% hydrocortisone in placebo gel. In contrast, 1% hydrocortisone in cream was more efficient than A. vera gel. Conclusions: In this study after 48 h the A. vera gel (97.5%) displayed some anti-inflammatory effects superior to those of 1% hydrocortisone in placebo gel. The A. vera gel tested here might be useful in the topical treatment of inflammatory skin conditions such as UV-induced erythema.
Reuter, J., et al. “Investigation of the anti-inflammatory potential of Aloe vera gel (97.5%) in the ultraviolet erythema test.” Skin pharmacology and physiology 21.2 (2008): 106-110.
Moisturizing effect of cosmetic formulations containing Aloe vera extract in different concentrations assessed by skin bioengineering techniques
Background/purpose: The polysaccharide-rich composition of Aloe vera extracts (Aloe barbadensis Miller), often used in cosmetic formulations, may impart moisturizing properties to the product. The aim of this study was to evaluate the effect of cosmetic formulations containing different concentrations of freeze-dried Aloe vera extract on skin hydration, after a single and a 1- and 2-week period of application, by using skin bioengineering techniques.
Methods: Stable formulations containing 5% (w/w) of a trilaureth-4 phosphate-based blend were supplemented with 0.10%, 0.25% or 0.50% (w/w) of freeze-dried Aloe vera extract and applied to the volar forearm of 20 female subjects. Skin conditions in terms of the water content of the stratum corneum and of transepidermal water loss (TEWL) (CorneometerTM CM 825 and TewameterTM TM 210) were analysed before and after a single and 1- and 2-week period of daily application.
Results: After a single application, only formulations supplemented with 0.25% and 0.50% (w/w) of Aloe vera extract increased the water content of the stratum corneum, while after the 2-week period application, all formulations containing the extract (0.10%, 0.25% and 0.50%) had the same effect, in both cases as compared with the vehicle. TEWL was not modified after a single and after 1- and 2-week period of application, when compared with the vehicle.
Conclusion: Our results show that freeze-dried Aloe vera extract is a natural effective ingredient for improving skin hydration, possibly through a humectant mechanism. Consequently, it may be used in moisturizing cosmetic formulations and also as a complement in the treatment of dry skin.
Dal’Belo, Susi Elaine, et al. “Moisturizing effect of cosmetic formulations containing Aloe vera extract in different concentrations assessed by skin bioengineering techniques.” Skin Research and Technology 12.4 (2006): 241-246. DOI: 10.1111/j.0909-752X.2006.00155.x
Hydrolysis of RRR-α-tocopheryl acetate (vitamin E acetate) in the skin and its UV protecting activity (an in vivo study with the rat)
Vitamin E acetate is often used rather than vitamin E as an ingredient of skin care products and dermatological preparations, because it lacks the free phenolic OH group. However, because of this the acetate as such is biologically inactive. In spite of this intrinsic inactivity, the skin is protected against the harmful effects of sunlight after topical application of vitamin E acetate. Therefore it is supposed that hydrolysis takes place in the skin and that the reaction product, the radical scavenger vitamin E, is responsible for the protection observed.
In this in vivo study with the rat, we have investigated the hydrolysis of RRR-α-tocopheryl acetate (vitamin E acetate) in the epidermis in relation to UV radiation protection. (As a measure of protection, we used the UV-induced binding of 8-methoxypsoralen to epidermal biomacromolecules.)
After a period of 5 h from a single application of vitamin E acetate, hydrolysis into free vitamin E was not observed. No protection was found at this time point, corresponding with the absence of vitamin E.
After treatment for 5 days, consisting of one topical application daily, the percentage of acetate present in the stratum corneum which was hydrolysed into free vitamin E was less than 1%, whereas the corresponding value for the viable layer of the epidermis was about 5%.
The hydrolysis of vitamin E acetate in the epidermis proceeded very slowly. As a result, the absolute amount of free vitamin E, found in the total epidermis after treatment for 5 days with the acetate, was only a few times higher than the normal level. Yet, this very small amount of free vitamin E proved to be sufficient for maximal protection in this animal model.
The results show that vitamin E acetate acts as a prodrug, which very slowly releases minute amounts of active vitamin E.
van Henegouwen, Gerard MJ Beijersbergen, Hans E. Junginger, and Henk de Vries. “Hydrolysis of RRR-α-tocopheryl acetate (vitamin E acetate) in the skin and its UV protecting activity (an in vivo study with the rat).” Journal of Photochemistry and Photobiology B: Biology 29.1 (1995): 45-51. doi:10.1016/1011-1344(95)90251-1
The role of vitamin E in normal and damaged skin
The generation of free oxygen radicals is believed to play an important pathogenic role in the development of various disorders. More than other tissues, the skin is exposed to numerous environmental chemical and physical agents such as ultraviolet light causing oxidative stress. In the skin this results in several short- and long-term adverse effects such as erythema, edema, skin thickening, wrinkling, and an increased incidence of skin cancer or precursor lesions. However, accelerated cutaneous aging under the influence of ultraviolet light, usually termed photoaging, is only one of the harmful effects of continual oxygen radical production in the skin. Others include cutaneous inflammation, autoimmunological processes, keratinization disturbances, and vasculitis. Vitamin E is the major naturally occurring lipid-soluble non-enzymatic antioxidant protecting skin from the adverse effects of oxidative stress including photoaging. Its chemistry and its physiological function as a major antioxidative and anti-inflammatory agent, in particular with respect to its photoprotective, antiphotoaging properties, are described by summarizing animal studies, in vivo tests on human skin and biochemical in vitro investigations. The possible therapeutic use in different cutaneous disorders, and pharmacological and toxicological aspects are discussed. Many studies document that vitamin E occupies a central position as a highly efficient antioxidant, thereby providing possibilities to decrease the frequency and severity of pathological events in the skin. For this purpose increased efforts in developing appropriate systemic and local pharmacological preparations of vitamin E are required.
Nachbar, F., and H. C. Korting. “The role of vitamin E in normal and damaged skin.” Journal of Molecular Medicine 73.1 (1995): 7-17. DOI 10.1007/BF00203614
Tocopheryl acetate nanoemulsions stabilized with lipid–polymer hybrid emulsifiers for effective skin delivery
Tocopheryl acetate is used as the oil component of nanoemulsions using a mixture of unsaturated phospholipids and polyethylene oxide-block-poly(ɛ-caprolactone) (PEO-b-PCL). This study investigates the effects of the lipid–polymer composition on the size and surface charge of nanoemulsions, microviscosity of the interfacial layer, and skin absorption of tocopheryl acetate. The lipid–polymer hybrid system exhibits excellent colloidal dispersion stability, which is comparable to that of polymer-based nanoemulsions. If lipids are used as emulsifiers, nanoemulsions show poor dispersion stability despite a good skin absorption enhancing effect. The amount of tocopheryl acetate absorbed by the skin increases with an increased lipid-to-polymer ratio, as determined using the hairless guinea pig skin loaded in a Franz-type diffusion cell. An 8:2 (w/w) mixture of unsaturated phospholipids and PEO-b-PCL exhibits the most efficient delivery of tocopheryl acetate into the skin. Our results show that tocopheryl acetate is absorbed almost twice as fast by the lipid–polymer hybrid system than the nanoemulsions stabilized with PEO-b-PCL. This study suggests that the lipid–polymer hybrid system can be used as an effective means of optimizing nanoemulsions in terms of dispersion stability and skin delivery capability.
Nam, Yoon Sung, et al. “Tocopheryl acetate nanoemulsions stabilized with lipid–polymer hybrid emulsifiers for effective skin delivery.” Colloids and Surfaces B: Biointerfaces 94 (2012): 51-57. doi:10.1016/j.colsurfb.2012.01.016