By Randy Schueller, Perry Romanowski
Alberto-Culver Co., Melrose Park, IL. contains targeted discussions of the biology of the outside and hair. additionally covers the chemical substances used as conditioners in dermis and hair items, and the tools and new concepts for picking out the efficacy of those items. For beauty researchers, dermatologists, and complicated scholars
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Additional info for Cosmetic Science and Technology Series, v.21. Conditioning Agents for Hair and Skin
Occlusive substances can be broken down into categories (69): Hydrocarbon oils and waxes: petrolatum, mineral oil, paraffin, squalene Silicone oils Vegetable and animal fats Fatty acids: lanolin acid, stearic acid Fatty alcohol: lanolin alcohol, cetyl alcohol Polyhydric alcohols: propylene glycol Wax esters: lanolin, beeswax, stearyl stearate Vegetable waxes: carnauba, candelilla Phospholipids: lecithin Sterols: cholesterol The most occlusive of the above chemicals is petrolatum (70). It appears, however, that total occlusion of the stratum corneum is undesirable.
J Invest Dermatol 1971; 57:133. 10. Smack DP, Korge, James WD. Keratin and keratinization. J Am Acad Dermatol 1994; 30:85-102. 11. Briggaman RA. Biochemical composition of the epidermal-dermal junction and other basement membranes. J Invest Dermatol 1982; 78:1. 12. Jarret A, ed. The Physiology and Pathophysiology of the Skin. Vol. III. The Dermis and Dendrocytes. London: Academic Press, 1974. 13. Smith LO, Holbrook KA, Byers PH. Structure of the dermal matrix during development and in the adult.
Plucking of the hairs from resting follicles can stimulate growth, however (41). C. Composition Hair is composed of keratin, a group of insoluble cystine-containing helicoidal protein complexes. The hair is made up of an amorphous matrix that is high in sulfur proteins and in which the keratin fibers are embedded. These protein complexes, which form 65-95% of the hair by weight, are extraordinarily resistant to degradation and are thus termed "hard," as opposed to the "soft" keratins that compose the skin (42).