不動池の酸性湖堆積物における脂質成分の特徴

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Laon-chain, singly-branched anteiso-alkanes, anteiso-alcohols and anteirso-fatty acids have been found in moderately acidified lake sediments (Fukushima et al., 1991 a, b, 1993). In this paper, we made an attempt to find these compounds in core samples taken from 3 acidic lakes, Fudo, Rokkannon and Onami in the Kirishima volcanos, and we analyzed the dredge samples from acidic lake Kutcharo and nonacidic lake Akan in Hokkaido for comparison. Four consecutive 2cm thick sections from acidic Lake Fudo were analyzed for hydrocarbons, alcohols, sterols and fatty acids. In section 4cm to 6cm and 6cm to 8cm, anteiso-alkanes and anteiso-alcohols were identified, with anteiso-alkanes represent-ing 7.8% of the n-alkanes and anteiso-alcohols representing 1.7% of the n-alcohols. In these 4-8cm sections, anteiso-fatty acids were also present. However, anteiso-com-pounds were not present in the 0-4cm sections. These anteiso-compounds may have been derived from microbial synthesis related to the specific conditions of this acidic lake. In the 0-10cm sections from acidic Lake Rokkannon and acidic Lake Onami, anteiso-compounds were not found. In Lake Fudo, sediments show a unimodal n-alkanes distribution, maximizing at C29 and an n-alcohols distribution pattern maximized in the C22-C28 region both of which have been attributed to higher plant sources. Predominant 4-desmethyl-sterols are stigmasterol(Q), β-sitosterol (U) both of which may also be attributed to higher plant detritus. The dominant 4-methyl-sterol is dinostanol (c). The ratio of stanols to stenols in the sediments from Lake Fudo are higher than the ratio at Lake Kutcharo and Lake Akan.
長崎大学教育学部の論文
1994-02-28

不動池の酸性湖堆積物における脂質成分の特徴

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