Abstract

Several unusual overlong-chain unsaturated aldehydes (22:1, 22:2, 23:1, 24:1, 24:2, and 25:2) were found in total lipids of the endemic sponge Lubomirskia baicalensis from Baikal Lake. Tetracos-17-enal was identified as the major aldehyde of the mixture using GC-MS and 1H and 13C NMR spectroscopy. A procedure for the isolation of total overlong-chain aldehydes was suggested. We think that the overlong-chain aldehydes defend the sponge from fouling and predators. The English version of the paper: Russian Journal of Bioorganic Chemistry, 2005, vol. 31, no. 6; see also http://www.maik.ru.

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