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 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
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. |
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ISSN: | 0146-6380 1873-5290 |
DOI: | 10.1016/S0146-6380(01)00019-5 |