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dc.creatorNytoft, Hans Peter
dc.creatorKildahl-Andersen, Geir
dc.creatorŠolević Knudsen, Tatjana
dc.creatorStojanović, Ksenija
dc.creatorRise, Frode
dc.date.accessioned2019-01-30T17:40:16Z
dc.date.available2019-01-30T17:40:16Z
dc.date.issued2014
dc.identifier.issn0146-6380
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/1470
dc.description.abstractA C-30 pentacyclic triterpane eluting slightly after 18 alpha(H)-oleanane in the m/z 191 mass chromatograms of Late Cretaceous/Tertiary terrigenous oils (peak "J'' in the early literature) has been isolated from a Niger Delta oil and identified using NMR spectroscopy as 3 beta-methyl-24-nor-18 alpha(H)-oleanane. The previous assignment as 18 beta(H)-oleanane is therefore partly erroneous. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane affords a larger m/z 412 -> 356 response than the oleananes and the relative contribution of 3 beta-methyl-24-nor-18 alpha(H)-oleanane to the 412 -> 191 "oleanane peak'' can be roughly estimated from comparison of the 412 -> 356/412 -> 191 ratio from the oleanane peak with that of the pure compounds. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane can be as abundant as 18a(H)-oleanane in oils having a high concentration of early eluting rearranged oleananes. 3 beta-Methyl-24-nor-19 alpha(H)-taraxastane was also tentatively assigned in the oils on the basis of its mass spectrum as well as its gas chromatography and high performance liquid chromatography retention times. 3 beta-Methyl-24-nor-gammacerane was tentatively assigned in a similar way in an oil containing gammacerane. All 3 beta-methyl-24-nor-triterpanes could be formed via dehydration, rearrangement and hydrogenation of triterpenoids having an OH group at C-3.en
dc.publisherPergamon-Elsevier Science Ltd, Oxford
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/176006/RS//
dc.relationOrganisation for the Prohibition of Chemical Weapons (OPCW)
dc.rightsrestrictedAccess
dc.sourceOrganic Geochemistry
dc.subjectBiomarkersen
dc.subjectOleananesen
dc.subjectRearranged oleananesen
dc.subjectCrude oilen
dc.subjectNMRen
dc.subjectHPLCen
dc.subjectGC-MSen
dc.titleCompound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleananeen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractКилдахл-Aндерсен, Геир; Стојановиц, Ксенија; Шолевић Кнудсен, Татјана; Рисе, Фроде; Нyтофт, Ханс Петер;
dc.citation.volume77
dc.citation.spage89
dc.citation.epage95
dc.citation.other77: 89-95
dc.citation.rankM21
dc.identifier.doi10.1016/j.orggeochem.2014.09.010
dc.identifier.rcubConv_3254
dc.identifier.scopus2-s2.0-84908328465
dc.identifier.wos000345430500008
dc.type.versionpublishedVersion


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