Composition and structure of secondary fatty alcohols and ketones,isolated from Pyrus malus skin wax

A homologous series of long-chain secondary fatty alcohols from C₂₁ to C₂₉ (C₂₉ being Predominant) has been isolated from the skin wax of a Bulgarian apple variety, Bouhavitsa. The alcohols were found only in a free state. Long-chain fatty ketones, with C₂₉ again markedly prevalent, have been isolated for the first time from the skin wax of this, and another variety, Tetovka. The C₂₉-ketone from both samples was identified by means of MS as nonacosan-10-one. A complete similarity has been found in the relative amounts of C₂₉ in the mixtures of secondary alcohols, ketones and paraffins.