Abstract
A procedure is described for the rapid preparation of phenacyl and naphthacyl derivatives of fatty acids. These derivatives of saturated, monounsaturated, and polyunsaturated fatty acids were analyzed by high-performance liquid chromatography (HPLC) on a C 18 reversed-phase column at nanogram sensitivity. Standard mixtures of fatty acids gave quantitative mole percentages. HPLC analyses of phenacyl and naphthacyl derivatives of fatty acids from several seed oils compared well with values obtained by gas—liquid chromatography (GLC). Oleic and elaidic, geometrical octadecenoate isomers, were well resolved. Three of the four Δ 9,12-octadecadienoic acids, geometrical isomers of linoleic acid, were also resolved. The rapid quantitative analysis of fatty acid phenacyl derivatives by HPLC hold some advantages over GLC, especially with samples that contain heat labile and short-chain fatty acids. Phenacyl derivatives of monoenoic fatty acids were also shown to undergo cis-trans isomerization when exposed to ultraviolet light.
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