✦ LIBER ✦

Sterane Biomarker Analysis via Ion Trap Mass Spectrometry

✍ Scribed by Dane E. Karr; Clifford C. Walters

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 415 KB
Volume: 10
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19960715)10:9<1088::aid-rcm627>3.0.co;2-h

No coin nor oath required. For personal study only.

✦ Synopsis

We have demonstrated the ability of an ion trap mass spectrometer to analyze North Sea and Azerbaijan oil saturate fractions for the presence of sterane biomarkers. Specifically, we have identified the CZ9 and C, steranes in the North Sea fraction and the C2,, C, and Cm steranes in the Azerbaijan oil fraction by tandem mass spectrometry. Selected-reaction monitoring of the transition from the respective molecular ions to the m/z 217 was used for identification of the molecular species. The results compare favorably with other work reported on sector or triple quadrapole mass spectrometers. The ion trap mass spectrometer is a viable, economic alternative for laboratories unable to afford or maintain research grade tandem mass spectrometry systems. This may become more significant since correct identification of steranes and other geochemical marker compounds is evolving as an essential tool in environmental studies. EXPERIMENTAL CIS+ saturated hydrocarbons (chain length greater than or equal to 15 carbons) were isolated from oils from the Central Viking Graben of the North Sea and from the South Caspian Basin of Azerbaijan. After the addition of an internal standard (Spcholestane) and the precipitation of

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