御池,鰻池堆積物中の2-ケトンとn-アルデヒドのGC/MS

概要

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An homologous series of n-alkan-2-ones (methyl ketones), C12 to C35 and a series of n-aldehydes, C12 to C34 were detected in surface sediments from oligotrophic Lake Miike in Kirishima and eutrophic Lake Unagiike in Kagoshima. Mass spectra of the n-alkan-2-ones displayed the following general fragmentation pattern ; base peak at m/z58 or m/z59, M+-15, M+-18, M+-58, M+-60, m/z71, m/z85, m/z127 and a molecular ion(M+). n-Aldehydes were recognized from the diagnostic mass fragment ions at M+-18, M+-44, M+-46, m/z86, m/z96, m/z110 and base peak at m/z57. n-Alkan-2-ones series with a strong odd carbon preference show major peaks at C25, C27, C29. n-Aldehydes series with a strong even carbon preference show major peaks at C26, C28, C30. Values for CPI, L/H and contents of n-alkan-2-ones and naldehydes are given in Table 2. A series of n-alkan-2-ones and n-aldehydes may be used as a possible source indicator of higher plant life. Friedelin was also detected which may have been derived from higher plants. Friedelin was abundant (5.5 μg/g) in the surface sediment from Lake Miike.
長崎大学教育学部の論文
1995-03-00