Researches in Organic Geochemistry
Online ISSN : 2189-7891
Print ISSN : 1344-9915
ISSN-L : 1344-9915
白亜紀木片化石の抵抗性高分子を構成する結合態脂肪酸および脂肪族アルコールの組成分布 : 分子古生物学的指標の検討
中村 英人沢田 健
ジャーナル フリー

2007 年 22 巻 p. 31-42


The chemical compositions of woody fossil fragments collected by picking manually and density centrifugation from sandstones of the Lower Cretaceous Yezo Group in Oyubari, central Hokkaido, Japan were analyzed by KOH/methanol hydrolysis (saponification) after solvent extraction. Organic compounds bound in macromolecules of the woody fragments with ester bonds, obtained by saponification, were mainly composed of short-chain (C14 to C18) fatty acids and series of n-alkanols ranging from C12 to C28 homologues. These ester bound constituents are attributed to moieties of polyester parts of selectively preserved resistant macromolecule like cutin or suberin. Even carbon-number predominance was observed in both compounds, which indicated that biological components were well preserved. The bound fatty acids showed similar distribution patterns among all samples, indicating that these moieties might have been altered by strong diagenetic processes. On the other hand, the distribution patterns of n-alkanols significantly varied. In particular, those of long-chain (>C20) n-alkanols varied possibly depending on plant taxonomy. Thus, we suggest that these parameters are strongly useful as molecular paleobiological indicators for chemotaxonomic analyses. Also, the distributions of short-chain n-alkanols and the ratios of short to long-chain homologues are presumably useful indicators for diagenesis, taphonomy and environment.

© 2007 日本有機地球化学会
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