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HOPANOIDS are important constituents of the cell wall of bacteria. As a kind of important biomarkers indicating the bacterial inputs, their diagenetic derivatives are widely distributed in sedimentary records. 25-norhopane series are one type of geohopanoids whose origins and geochemical significances are still in dispute. 25-norhopane is usually used as the reliable indicators of oil biodegradation. In this study 25-norhopane series and 25, 30-bisnorgammac
HOPANOIDS are important constituents of the cell wall of bacteria. As a kind of important biomarkers indicating the bacterial inputs, their diagenetic derivatives are widely distributed in sedimentary records. 25-norhopane series are one type of geohopanoids whose origins and geochemical significances are still in dispute . 25-norhopane is usually used as the reliable indicators of oil biodegradation. In this study 25-norhopane series and 25, 30-bisnorgammac