Computerised gas chromatographic-mass spectrometric analysis of complex mixtures of alkyl porphyrins

P. J. Marriott, J. P. Gill, R. P. Evershed, C. S. Hein, G. Eglinton

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Computerised capillary gas chromatography-mass spectrometry (GC-MS) analysis of complex mixtures of alkyl porphyrins, as their bis-(trimethylsiloxy)silicon(IV) and bis(tert.-butyldimethylsiloxy)silicon(IV) derivatives, is described. The latter derivative is more suitable for routine GC-MS analysis. This computerised GC-MS approach, when applied to the alkyl porphyrins of two geological samples, a bitumen (Gilsonite, Eocene age, UT, U.S.A.) and a crude oil (Boscan, Cretaceous age, West Venezuela), has revealed the highly complex compositions of these fractions. Computer-aided data processing, using relative retention index (RRI) calculations, facilitated the classification of the chromatographic peaks according to structural type and membership of pseudo-homologous series. Computerised GC-MS is compared with, and contrasted to high-performance liquid chromatography as a means of petroporphyrin analysis.

Original languageEnglish
Pages (from-to)107-128
Number of pages22
JournalJournal of Chromatography A
Issue numberC
Publication statusPublished - 1 Jan 1984
Externally publishedYes

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