설명(영) |
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Fats and Oils, as a group, are the glyceryl esters of Fatty Acids (triglycerides) normally found in animal and plant tissues, including those which have been hydrogenated to reduce or eliminate unsaturation. Also included are synthetically-prepared esters of glycerin and fatty acids. They possess the structure:
in which -COR, -COR', -COR'' may be the same or different fatty acid radicals.
Naturally occurring fats and oils in this group are Esters and can be hydrolyzed to yield glycerin and mixtures of fatty acids. These fatty acids may serve as raw materials for a variety of other chemicals useful in cosmetics. Alternately, isolated and purified fatty acids can be esterified with glycerin to yield mono-, di-, and triglycerides. The last are relatively pure fats which differ only slightly from the fats and oils found in nature.
Fats and Oils are used directly in cosmetics as emollient vehicles and lubricants. Volatile oils obtained by the distillation of plant material are classified as Essential Oils. |