설명(영) |
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Proteins are naturally occurring, long-chain, high molecular weight polymers formed by the self-condensation of Amino Acids (an amidation reaction). Only a few natural proteins have found use in cosmetics or toiletries, where they are employed for their esthetic and conditioning properties.
Naturally occurring, water-soluble proteins are somewhat unstable and tend to precipitate or denature when exposed to high temperatures or concentrated salt solutions. Water-insoluble proteins are less sensitive to denaturation, but like all proteins are subject to hydrolysis by enzymes as well as chemical reagents, such as acids or bases.
Almost all enzymes are proteins which possess the ability to catalyze various chemical reactions (synthetic or hydrolytic). Typical are Urease (which produces ammonia from urea), Catalase (which produces oxygen from peroxides), and Papain (which can hydrolyze other proteins).
In cosmetics, Proteins find use as conditioning agents and as film formers (upon drying). Enzymes are employed in cosmetics for their specific catalytic effects. |