Computerised gas chromatographic—mass spectrometric and high-performance liquid chromatographic analysis of sedimentary benzoporphyrins
Identifieur interne : 001265 ( Main/Exploration ); précédent : 001264; suivant : 001266Computerised gas chromatographic—mass spectrometric and high-performance liquid chromatographic analysis of sedimentary benzoporphyrins
Auteurs : S. Kaur [Royaume-Uni] ; J. P Gill [Royaume-Uni] ; R. P Evershed [Royaume-Uni] ; G. Eglinton [Royaume-Uni] ; J. R Maxwell [Royaume-Uni]Source :
- Journal of Chromatography A [ 0021-9673 ] ; 1989.
Abstract
Recently developed gas chromatographic—mass spectrometric (GC-MS) and high-performance liquid chromatographic (HPLC) procedures for the analysis of petroporphyrios have been employed in the search for benzoporphyrins in six sediments, a bitumen and a petroleum. In addition, structurally assigned monobenzocycloalkanoporphyrms (benzo-CAPs) isolated from Boscan crude oil (Cretaceous, Venezuela) have been used in a co-chromatographic study of these minor components (ca. 1% of total porphyrins). The petroporphyrins are generally obtained by demetallation of metalloporphyrins from samples representing a variety of geographical locations and ages ranging from Permian (ca. 235 million years) to Palaeocene (ca. 60 million years). The data show that, where the benzo-CAPs were detected, up to 24 components can occur, although the dominant member in each case is the C33 compound. Studies of a chromatographic fraction from Boscan crude oil, enriched in high-carbon-number benzo-CAPs, indicates that the series extends from at least C30 to C38 in this sample. The GC behaviour of the benzo-CAPs as the bis(tert.-butyldimethylsiloxy)Si(IV) [(TBDMSO)2Si(IV)] derivatives is characterised by the high Kováts retention indices (ca. 3900-4300; OV-1 column). Similarly, under normal-phase HPLC conditions, the free-base benzo-CAPs elute after the major alkylporphyrins. HPLC co-chromatography of the free-bases provides a rapid means of identification of the major benzo-CAPs (C32 and C33), while the GC-MS procedure allows more detailed characterisation and quantitation of the benzo-CAP distributions as their (TBDMSO)2Si(IV) derivatives.
Url:
DOI: 10.1016/S0021-9673(00)91297-4
Affiliations:
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R Maxwell</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Organic Geochemistry Unit, University of Bristol, School of Chemistry, Cantock's Close</wicri:regionArea><wicri:noRegion>Cantock's Close</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Chromatography A</title><title level="j" type="abbrev">CHROMA</title><idno type="ISSN">0021-9673</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1989">1989</date><biblScope unit="volume">473</biblScope><biblScope unit="supplement">C</biblScope><biblScope unit="page" from="135">135</biblScope><biblScope unit="page" to="151">151</biblScope></imprint><idno type="ISSN">0021-9673</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-9673</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Recently developed gas chromatographic—mass spectrometric (GC-MS) and high-performance liquid chromatographic (HPLC) procedures for the analysis of petroporphyrios have been employed in the search for benzoporphyrins in six sediments, a bitumen and a petroleum. In addition, structurally assigned monobenzocycloalkanoporphyrms (benzo-CAPs) isolated from Boscan crude oil (Cretaceous, Venezuela) have been used in a co-chromatographic study of these minor components (ca. 1% of total porphyrins). The petroporphyrins are generally obtained by demetallation of metalloporphyrins from samples representing a variety of geographical locations and ages ranging from Permian (ca. 235 million years) to Palaeocene (ca. 60 million years). The data show that, where the benzo-CAPs were detected, up to 24 components can occur, although the dominant member in each case is the C33 compound. Studies of a chromatographic fraction from Boscan crude oil, enriched in high-carbon-number benzo-CAPs, indicates that the series extends from at least C30 to C38 in this sample. The GC behaviour of the benzo-CAPs as the bis(tert.-butyldimethylsiloxy)Si(IV) [(TBDMSO)2Si(IV)] derivatives is characterised by the high Kováts retention indices (ca. 3900-4300; OV-1 column). Similarly, under normal-phase HPLC conditions, the free-base benzo-CAPs elute after the major alkylporphyrins. HPLC co-chromatography of the free-bases provides a rapid means of identification of the major benzo-CAPs (C32 and C33), while the GC-MS procedure allows more detailed characterisation and quantitation of the benzo-CAP distributions as their (TBDMSO)2Si(IV) derivatives.</div></front></TEI><affiliations><list><country><li>Royaume-Uni</li></country></list><tree><country name="Royaume-Uni"><noRegion><name sortKey="Kaur, S" sort="Kaur, S" uniqKey="Kaur S" first="S" last="Kaur">S. Kaur</name></noRegion><name sortKey="Eglinton, G" sort="Eglinton, G" uniqKey="Eglinton G" first="G" last="Eglinton">G. Eglinton</name><name sortKey="Evershed, R P" sort="Evershed, R P" uniqKey="Evershed R" first="R. P" last="Evershed">R. P Evershed</name><name sortKey="Gill, J P" sort="Gill, J P" uniqKey="Gill J" first="J. P" last="Gill">J. P Gill</name><name sortKey="Maxwell, J R" sort="Maxwell, J R" uniqKey="Maxwell J" first="J. R" last="Maxwell">J. R Maxwell</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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