Lipids are esters of long chain of fatty acids and alcohols or of closely related derivatives.The chief difference between these substance is the type of alcohol,in fixed oil and fats,glycerol combines with the fatty acids, in waxes,the alcohol has a higher molecular weight,e.g.,cetyl alcohol.
Fast and fixed oils are obtained from either plant (olive oil, peanut oil) or animals(lard).Their primary function is food (energy) storage.The fixed oils and fats are important products used pharmaceutically,industrially,and nutritionally.Waxes may also be of plant or animal origin.Many drugs contain fixed oils and fats as their principal constituents; the fixed oils and fast are often separated from the crude vegetable drugs (by expression) or the crude animal drugs (by rendering or extraction) and are employed as drugs in the refined state.
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