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Keywords:

  • Hopanoids;
  • temperature adaptation;
  • extreme environments;
  • Bacillus acidocaldarius

Abstract A gas-liquid chromatographic method for the quantitative determination of hopanoids with an elongated side chain was developed. After extraction of lipids from Bacillus acidocaldarius, periodate oxidation, reduction and acetylation the 1-hydroxyethane-29-hopane acetate was quantitated by comparison with 1-octadecanyl-glycerol ether. The contents of extended hopanoids increased strongly with increasing temperature and moderately with decreasing pH. Hopene showed no significant alteration with temperature and pH.