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Analysis of crocetane in crude oils and sediments: novel stationary phases for use in GC-MS

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Authors
Barber, Cindy
Bastow, Trevor
Grice, Kliti
Alexander, Robert
Kagi, Robert
Date
2001
Type
Journal Article

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Barber, Cindy and Bastow, Trevor and Grice, Kliti and Alexander, Robert and Kagi, Robert. 2001. Analysis of crocetane in crude oils and sediments: novel stationary phases for use in GC-MS. Organic Geochemistry. 32 (5): pp. 765-769.
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Organic Geochemistry
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Department of Applied Chemistry
School of Science and Computing
Faculty of Science and Engineering
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The link to the journal’s home page is: "http://www.elsevier.com/wps/find/journaldescription.cws_home/622273/description#description" Copyright © 2001 Elsevier B.V. All rights reserved

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Abstract

Cyclodextrin GC stationary phases, well documented for their superior isomeric separation capabilities, have been investigated in the separation of crocetane (2,6,11,15-tetramethylhexadecane) and phytane (2,6,10,14-tetramethylhexadecane). Although crocetane has been attributed to methane oxidizing archaea, its general occurrence in crude oils and sediments is yet to be fully established due to difficulties associated with the GC?MS analysis since crocetane co-elutes with phytane when chromatographed on most liquid phase coated capillary columns. A method is described for the routine GC-MS analysis of crocetane and phytane in crude oils and sediments, using cyclodextrinstationary phases. Numerous derivatised cyclodextrin columns were investigated. A 50 m permethyl-b-cyclodextrin was found to give the best resolution (R=0.8 using hydrogen as the carrier gas and R=0.7 using helium).