Low molecular weight compounds and biological markers generated by ruthenium tetroxide oxidation of a type II kerogen : Implications for molecular structure and diagenetic reaction

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Ruthenium tetroxide oxidation has been used as an aid to elucidating molecular structures in a type II kerogen. We have improved on the conventional method by characterizing some of the low molecular weight compounds present in the products. Aliphatic α, ω-dicarboxylic acids (C_2-C_<23>), normal monocarboxylic acids (C_2-C_<29>), branched α, ω-dicarboxylic acids (C_4-C_7), and benzene mono- to tetracarboxylic acids were detected as the main products. Carbon number distributions of the aliphatic α, ω-dicarboxylic acids indicate that the type II kerogen contains short polymethylene bridges in the macromolecular network. Isomer distributions of the benzene polycarboxylic acids show that naphthalene-/anthracene-type structures and biaryl-linkages are the dominant aromatic moieties in the network. As minor compounds we detected a series of hopanoic acids (C_<30>-C_<34>) and carboxysteranes (C_<28>-C_<30>). Correspondence of the carbon number range of the steroid skeletons in the kerogen with those of steranes in the bitumen suggests that precursor molecules, such as sterols, were incorporated into the kerogen and attached with aromatic units during diagenesis. Comparison of the hopanoic acids and hopanes in the bitumen indicates that the hopanoids in the kerogen retained their carbon number distribution during the incorporation of their precursor molecules into the kerogen matrix; further, they are more stable towards isomerization compared to the bitumen hopanes.
日本有機地球化学会の論文
2003-08-20

Low molecular weight compounds and biological markers generated by ruthenium tetroxide oxidation of a type II kerogen : Implications for molecular structure and diagenetic reaction

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