Fatty acids of bacterial origin in contemporary marine sediments

Details Fatty acids of bacterial origin in contemporary marine sediments Fatty acids of bacterial origin in contemporary marine sediments

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1715p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Issue 11, pp.1715-1725

Mathematics

Logic

20

Scientific paper

Contributions by bacteria to recent sediments have been recognized as one important source of input for the extractable lipids. It has, however, proved difficult so far to conclusively relate the components identified to the contributing bacteria. This fact is primarily related to the lack of information on both the lipid chemistry of marine bacteria, and of detailed structures of the sedimentary lipids. In this paper a study of the fatty acids from a tropical marine sediment selected because of its high biomass content is reported, and relationships between the sedimentary extracts of the surface layer to fatty acid components of bacteria cultured from the sediment sample are detailed. By selecting specific structural features, a group of fatty acids have been identified as valid markers for bacteria in this environment: these include iso- and anteiso-branched chain acids; 10-methylpalmitic acid; cyclopropyl 17:0 and 19:0 acids of which 19:0 (11,12) is unique to bacteria; cis -vaccenic acid; and the 15:1, 17:1 6 and 8 isomers especially when these occur in pairs; iso 7-15: 1 and iso 9-17:1 are branched unsaturated acids apparently unique to bacteria. Trans -monoene fatty acids are likely to be a direct bacterial input, and the hydroxy acids identified are probably of bacterial cell wall origin. This study, whilst emphasizing the necessity for detailed structural information on fatty acids in order to use them validly as biological markers, considerably extends the range of fatty acids as markers of bacterial input to contemporary sediments.

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