河川および湖底堆積物中の高分子有機物(ケロージェン)の化学的特徴 [in Japanese] Chemical characterization of organic geopolymers (kerogens) in river and lake sediments [in Japanese]
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Insoluble organic materials (kerogens) isolated from lake (L. Haruna) and river (R. Tamagawa) sediments were characterized by a chemical oxidation (KMnO<sub>4</sub>) method and their compositions of amino acids, carbohydrates and fatty acids were determined. The formation process of kerogen was discussed on the basis of the results. (1) Amino acids, carbohydrates and fatty acids comprise 6.8 to 10.7% (wt%) of kerogens, which correspond to 1.8-3.0% of the total organic matter (TOM) in sediments. (2) The enrichment factors (a concentration of a component in the kerogen divided by a concentration of the component relative to TOM in the sediment) of amino acids, carbohydrates and fatty acids are: carbohydrates (0.04-0.08)<amino acids (0.37-0.58)<fatty acids (1.23-2.50). This result shows that a significant amount of fatty acids is enriched in the kerogens. (3) A possible mechanism for the formation of kerogens in recent sediments is as follows: at the first stage, kerogen-nucleus is formed through a Maillard Reaction from carbohydrates and amino acids during deposition and in sediment. In parallel with this reaction, hydrophobic compounds as fatty acids incorporate into the kerogen-nucleus.
Chikyukagaku 15(2), 60-69, 1981
The Geochemical Society of Japan