TY - JOUR
T1 - The occurrence of unusual hopenes in hydropyrolysates generated from severely biodegraded oil seep asphaltenes
AU - Meredith, Will
AU - Snape, Colin E.
AU - Carr, Andrew D.
AU - Nytoft, Hans P.
AU - Love, Gordon D.
N1 - Funding Information:
The authors would like to thank F. Robertson for providing the West African oil seep, and the NERC for financial support (Grants NER/T/S/2001/01153 & NE/C507002/1). Helpful comments by S. Killops and an anonymous reviewer are greatly appreciated.
PY - 2008/8
Y1 - 2008/8
N2 - Catalytic hydropyrolysis has been used to generate pristine biomarker profiles from the asphaltenes isolated from a West African oil seep, which had been subjected to such severe biodegradation that it contained no recognisable free biomarkers. In addition to the expected hopanes, the m/z 191 mass chromatogram contained four peaks, which appeared to be hopenes; 22,29,30-trisnorhop-17(21)-ene is relatively common in hydropyrolysates, but the other three have only been encountered in a few samples. After isolation using high performance liquid chromatography (HPLC), hydrogenation and isomerisation experiments, the two C
30 compounds were tentatively assigned as 17α(H)-hop-20(21)-ene and 17β(H)-hop-20(21)-ene, and the C
27 compound as 22,29,30-trisnorhop-16(17)-ene.
AB - Catalytic hydropyrolysis has been used to generate pristine biomarker profiles from the asphaltenes isolated from a West African oil seep, which had been subjected to such severe biodegradation that it contained no recognisable free biomarkers. In addition to the expected hopanes, the m/z 191 mass chromatogram contained four peaks, which appeared to be hopenes; 22,29,30-trisnorhop-17(21)-ene is relatively common in hydropyrolysates, but the other three have only been encountered in a few samples. After isolation using high performance liquid chromatography (HPLC), hydrogenation and isomerisation experiments, the two C
30 compounds were tentatively assigned as 17α(H)-hop-20(21)-ene and 17β(H)-hop-20(21)-ene, and the C
27 compound as 22,29,30-trisnorhop-16(17)-ene.
UR - http://www.scopus.com/inward/record.url?scp=47849130789&partnerID=8YFLogxK
U2 - 10.1016/j.orggeochem.2008.01.022
DO - 10.1016/j.orggeochem.2008.01.022
M3 - Article
SN - 0146-6380
VL - 39
SP - 1243
EP - 1248
JO - Organic Geochemistry
JF - Organic Geochemistry
IS - 8
ER -