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 Distributions of fatty acids and alcohols bound in resistant macromolecules of the Cretaceous woody-fragment fossils : search for molecular paleontological indicators

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著者

    • 中村 英人 NAKAMURA Hideto
    • 北海道大学大学院理学院 自然史科学専攻 Department of Natural History Sciences, Faculty of Science, Hokkaido University
    • 沢田 健 SAWADA Ken
    • 北海道大学大学院理学院 自然史科学専攻 Department of Natural History Sciences, Faculty of Science, Hokkaido University

抄録

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 (C_<14> to C_<18>) fatty acids and series of n-alkanols ranging from C_<12> to C_<28> 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 (>C_<20>) 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.

収録刊行物

  • Researches in organic geochemistry

    Researches in organic geochemistry 22, 31-42, 2007-12-28

    日本有機地球化学会

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各種コード

  • NII論文ID(NAID)
    110007504591
  • NII書誌ID(NCID)
    AA11889471
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13449915
  • NDL 記事登録ID
    9342070
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z74-B569
  • データ提供元
    CJP書誌  NDL  NII-ELS 
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