Oleanane or lupane? Reappraisal of the presence of oleanane in Cretaceous–Tertiary oils and sediments
作者： Hans Peter Nytoft , Jørgen A. Bojesen-Koefoed , Flemming G. Christiansen , Martin G. Fowler
DOI: 10.1016/S0146-6380(02)00138-9
关键词:
摘要: Nonpolar GC-columns are normally used for GC–MS analysis of saturate fractions from crude oils. Under these conditions lupane coelutes with oleananes and some minor C30 compounds non-terrigenous origin having lupane-like mass spectra. Because any peak eluting fractionally earlier than 17α,21β(H)-hopane in the m/z 191 chromatogram is routinely assigned to oleanane, presence may sometimes have been overlooked. Lupane easily separated using reverse phase HPLC. Triterpane concentrates 10 oils known contain were HPLC-separated. was unambiguously identified six by full-scan HPLC-retention time authentic lupane. GC-separation possible polar a polyethylene glycol stationary [Organic Geochemistry, 23 (1995) 21], allowing estimation lupane/(lupane+oleanane) ratio. High ratios measured Marraat oil, West Greenland (0.8) Amauligak oil Beaufort–Mackenzie Delta (0.26). The results suggest that be more frequently occurring previously thought, this compound preferably associated high latitude samples. concentrations 28-nor- 24,28-bisnortriterpanes (oleananes, lupanes taraxastanes) detected oil.
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