title: Extractable and lipopolysaccharide fatty acid and hydroxy acid profiles from Desulfovibrio species.
abstract: 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.
mesh_terms: D003901:Desulfovibrio / Q000032:analysis* / Q000145:classification; D005227:Fatty Acids / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis; D006880:Hydroxy Acids / Q000032:analysis*; D008070:Lipopolysaccharides / Q000032:analysis*; D010743:Phospholipids / Q000032:analysis*
chemical_list: D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D006880:Hydroxy Acids; D008070:Lipopolysaccharides; D010743:Phospholipids