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Journal of Lipid Research, Vol 26, 982-988, Copyright © 1985 by Lipid Research, Inc.

ARTICLES

Extractable and lipopolysaccharide fatty acid and hydroxy acid profiles from Desulfovibrio species

A Edlund, PD Nichols, R Roffey and DC White

An analysis of the phospholipid ester-linked and the lipopolysaccharide (LPS) fatty acids and hydroxy fatty acids of six lactate-utilizing Desulfovibrio-type sulfate-reducing bacteria (SRB) has been performed using capillary gas-liquid chromatography-mass spectrometry (GLC-MS). The concentrations of normal fatty acids were essentially similar, with the possible exception of a high content of normal fatty acids in the LPS of Desulfovibrio gigas. Determination of monounsaturated acid double bond configuration was performed by GLC-MS analysis of the derivatized fatty acids. A total of nine branched chain and eight straight chain monounsaturated fatty acids was detected in the Desulfovibrio species analyzed. The major component detected in five Desulfovibrio was the 17-carbon iso-branched monoenoic acid which showed cis unsaturation [i17:1(n-7)c] seven carbons from the terminal methyl group of the fatty acid chain. D. gigas, in contrast, contained almost no unsaturated fatty acids and was greatly enriched in iso- branched 15:0. Major differences between strains were found in the phospholipid and LPS hydroxy fatty acids. These components, in addition to the i17:1(n-7)c and other characteristic branched chain unsaturated acids, can possibly be utilized as signatures of the lactate-utilizing SRB.
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