17α,21α(H)-hopanes: Natural and synthetic

Hans Peter Nytoft, Jørgen A. Bojesen-Koefoed

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

33 Citationer (Scopus)

Abstrakt

17α,21α(H)-hopanes are found in low concentrations in sediments and oils, but C30 17α,21α(H)-hopane is the only member of the series which can be detected in the m/z 191 mass chromatogram. The ratio of C30 17α,21α(H)-hopane to C30 17α,21β(H)-hopane is typically 0.02-0.04 in crude oils and mature sediments. Ratios up to 0.10 have been found in immature sediments with 22S/(22S + 22R) ratios of C31-C35 hopanes around 0.4. Compounds coeluting with 17α,21α (H)-hopane are usually absent in samples of early oil window rank or higher maturity. 17α,21α(H)-hopane and 17α,21β (H)-hopane have almost identical mass spectra and response factors in the m/z 191 mass chromatogram. These features make 17α,21α(H)-hopane an ideal internal standard for the quantification of hopanes in oils and sediments. 17α,21α(H)-hopane can be obtained in high yield by hydrogenation of synthetic hopa-15,17(21)-diene.

OriginalsprogEngelsk
Sider (fra-til)841-856
Antal sider16
TidsskriftOrganic Geochemistry
Vol/bind32
Udgave nummer6
DOI
StatusUdgivet - jun. 2001

Programområde

  • Programområde 3: Energiressourcer

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