TY - JOUR
T1 - 17α,21α(H)-hopanes
T2 - Natural and synthetic
AU - Nytoft, Hans Peter
AU - Bojesen-Koefoed, Jørgen A.
N1 - Funding Information:
Samples from Vietnam were supplied by Petrovietnam and Vietnam Petroleum Institute. Hop-17(21)-ene and hopa-15,17(21)-diene were prepared by Toni Kennet Corleoné Jørgensen, Kate Lund, Steen Wendel Sørensen and Jens Valdemar Thomsen. Extraction of source rocks and MPLC-separation was done by Ditte Kiel-Dühring, Una Høegh-Guldberg, Ayoe Slot Hansen, Suzanne Wulff-Harslund and Simon Kopalski. Funding was provided by the Danish Energy Research Programme (EFP-98), grant 1313/98-0022. We thank A. Bishop, M. Moldowan, B.J. Keely and A.G. Douglas for their constructive reviews.
PY - 2001/6
Y1 - 2001/6
N2 - 17α,21α(H)-hopanes are found in low concentrations in sediments and oils, but C30 17α,21α(H)-hopane is the only member of the series which can be detected in the m/z 191 mass chromatogram. The ratio of C30 17α,21α(H)-hopane to C30 17α,21β(H)-hopane is typically 0.02-0.04 in crude oils and mature sediments. Ratios up to 0.10 have been found in immature sediments with 22S/(22S + 22R) ratios of C31-C35 hopanes around 0.4. Compounds coeluting with 17α,21α (H)-hopane are usually absent in samples of early oil window rank or higher maturity. 17α,21α(H)-hopane and 17α,21β (H)-hopane have almost identical mass spectra and response factors in the m/z 191 mass chromatogram. These features make 17α,21α(H)-hopane an ideal internal standard for the quantification of hopanes in oils and sediments. 17α,21α(H)-hopane can be obtained in high yield by hydrogenation of synthetic hopa-15,17(21)-diene.
AB - 17α,21α(H)-hopanes are found in low concentrations in sediments and oils, but C30 17α,21α(H)-hopane is the only member of the series which can be detected in the m/z 191 mass chromatogram. The ratio of C30 17α,21α(H)-hopane to C30 17α,21β(H)-hopane is typically 0.02-0.04 in crude oils and mature sediments. Ratios up to 0.10 have been found in immature sediments with 22S/(22S + 22R) ratios of C31-C35 hopanes around 0.4. Compounds coeluting with 17α,21α (H)-hopane are usually absent in samples of early oil window rank or higher maturity. 17α,21α(H)-hopane and 17α,21β (H)-hopane have almost identical mass spectra and response factors in the m/z 191 mass chromatogram. These features make 17α,21α(H)-hopane an ideal internal standard for the quantification of hopanes in oils and sediments. 17α,21α(H)-hopane can be obtained in high yield by hydrogenation of synthetic hopa-15,17(21)-diene.
KW - 17α, 21α(H)-hopanes
KW - Biomarkers
KW - Hop-17(21)-enes
KW - Hopa-15, 17(21)-dienes
KW - Hopanes
KW - Hydrogenation
KW - Internal standards
UR - http://www.scopus.com/inward/record.url?scp=0035009016&partnerID=8YFLogxK
U2 - 10.1016/S0146-6380(01)00028-6
DO - 10.1016/S0146-6380(01)00028-6
M3 - Article
AN - SCOPUS:0035009016
SN - 0146-6380
VL - 32
SP - 841
EP - 856
JO - Organic Geochemistry
JF - Organic Geochemistry
IS - 6
ER -