Journal
ORGANIC GEOCHEMISTRY
Volume 40, Issue 6, Pages 667-670Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2009.04.001
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in addition to the previously reported 25-norhopanes and 25-norhopanoic acids, for the first time we report the identification of 25-norbenzohopanes. The hydrocarbon composition of the bitumen from Palaeozoic carbonates in northern Alberta displays molecular evidence for severe levels of biodegradation characterised by the removal Of C(30)-C(35) hopanes. Biodegradation is also indicated by the removal of C(32) and C(33) benzohopanes. The appearance Of C(31) and C(32) 25-norbenzohopanes corresponds to the decrease in C(32) and C(33) benzohopanes, suggesting that 25-norbenzohopanes originate by demethylation of benzohopane counterparts. Demethylation at C-10 in the hopanoids affects a broader class of compounds that so far includes the hopanes and hopanoic acids, as well as the benzylated hopanoid species. (C) 2009 Elsevier Ltd. All rights reserved.
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