Abstract
The cuticle wax of the grape is composed
of a soft wax (30%) readily removed by light petroleum and a hard wax (30%),
mainly oleanolic acid, removed by chloroform. The soft wax of the fresh grape
is composed chiefly of long-chain alcohols together with smaller amounts of
aldehydes, esters, fatty acids, hydrocarbons, oleanolic acid, and small amounts
of high molecular weight substances. The soft wax of dried grapes is similar in
composition but contains no aldehydes and larger amounts of high molecular weight
substances and oxidation products. The aldehydes, unusual wax components, are
straight chain and range from C16 to C32 with the even
chain-lengths predominating. They were destroyed by neutral alumina but can be
chromatographed on silicic acid.
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