Abstract
From the surface sediment of a eutrophic lake (Japan), the double bond position in the monounsaturated fatty acids (C 15-C 26) has been determined by combined gas chromatography-mass spectrometry of the methoxylated derivatives. The relative abundance of 11-octadecenoic acid, suggested to be of bacterial origin, is higher in the chloroform-methanol extract than the extract by saponification.
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