Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4873k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 23, pp.4873-4876
Physics
6
Scientific paper
In a North Sea oil, the carotenoid derivatives -carotene, -isorenieratane, and isorenieratane were identified, together with a series of aryl isoprenoids with a 2,3,6-trimethyl substitution pattern for the aromatic ring. The 13 C values of -carotene and -isorenieratane are similar, whereas isorenieratane is ca. 15% heavier. This suggests that -isorenieratane is not derived from -isorenieratane biosynthesised by Chlorobiaceae , but from aromatisation of -carotene. This was confirmed by laboratory aromatisation of partially hydrogenated -carotene, which yielded -isorenieratane as the main product. The aryl isoprenoids, which can be formed by C---C bond cleavage of both isorenieratane and -isorenieratane, have a mixed isotopic signature in the oil. These results indicate that mere identification of aryl isoprenoids, without determination of their 13 C values, cannot be used to assess the presence of Chlorobiaceae , and, thus, photic zone anoxia in the depositional environment.
Kohnen Math E. L.
Koopmans Martin P.
Schouten Stefan
Sinninghe Damst'e Jaap S.
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