Gas‐liquid chromatographic analysis of cyclopropene fatty acids

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Abstract

A gas-liquid chromatographic method is described for the quantitative estimation of cyclopropene fatty acids as their methyl mercaptan derivatives. This method estimates individual cyclopropene acids as well as normal and cyclopropane acids. Nine seed oils were analyzed for their cyclopropene fatty acid content.Evidence was obtained for the presence of a cyclopropene fatty acid of shorter chain length than malvalic inAlthaea rosea cav and one with a higher chain length than sterculic inBombacopsis glabra seed oil. This method is less accurate for cottonseed oil than for the other oils tested because of the appearance of some unsymmetrical peaks of unknown origin.The mercaptan derivatives of the cyclopropene acids may be isolated by silver ion thin-layer chromatography.Small amounts of cyclopropane fatty acids were found in a number of the oils analyzed for cyclopropene fatty acids.

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