Computer Science
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.3075s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 11, pp.3075-3082
Computer Science
5
Scientific paper
The steroidal alkanes of a selection of sediments and oils have been examined by GC-MS with multiple metastable reaction monitoring. Specific 4-methyl sterane isomers have been identified by comparison with isomers synthesized from sterols isolated from dinoflagellates. An immature marine oil shale and two mature marine oils of Triassic to early Cretaceous age contained high concentrations of C 30 steranes comprising desmethyl, 24-ethyl-4 -methylcholestane and 4 ,23,24-trimethylcholestane (dinosterane) isomers. An immature non-marine oil shale and two non-marine oils of Cretaceous to Eocene age contained stereoisomers of 24-ethyl-4 -methylcholestane as the dominant C 30 steranes. Reaction monitoring analyses in GC-MS are particularly suited to unravelling complex distributions of homologous and stereoisomeric steroids encountered in oils and their source rocks.
Boreham Christopher J.
Summons Roger E.
Volkman John K.
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