Identification of a novel alkenone in Black Sea sediments

We report the identification of a novel long-chain ketone in Holocene Black Sea sediments. Based on chemical properties, and chromatographic and mass spectrometric characteristics, this compound has been identified as a di-unsaturated C 36 ethyl ketone. Further analyses indicated the position and co...

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Veröffentlicht in:Organic geochemistry 2001-01, Vol.32 (5), p.633-645
Hauptverfasser: Xu, L., Reddy, C.M., Farrington, J.W., Frysinger, G.S., Gaines, R.B., Johnson, C.G., Nelson, R.K., Eglinton, T.I.
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Sprache:eng
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Zusammenfassung:We report the identification of a novel long-chain ketone in Holocene Black Sea sediments. Based on chemical properties, and chromatographic and mass spectrometric characteristics, this compound has been identified as a di-unsaturated C 36 ethyl ketone. Further analyses indicated the position and configuration of the double bonds, and the novel alkenone was determined to be hexatriaconta-(16 E,21 E)-dien-3-one. While this compound is present in only trace quantities in Unit I sediments, it is the most abundant alkenone in portions of Unit II. Its presence thus apparently pre-dates the invasion of Emiliania huxleyi in the Black Sea. The down-core profiles and isotopic compositions suggest that the precursor for the C 36:2 alkenone may be distinct from that of the C 37-39 alkenones, however the biological origin of this novel compound is presently unknown.
ISSN:0146-6380
1873-5290
DOI:10.1016/S0146-6380(01)00019-5