NDLI: Identification and significance of 3β-alkyl steranes in the Eogene lacustrine sediments and petroleum of China

Content Provider	Springer Nature Link
Author	Wang, Guangli Zhang, Linye Wang, Tieguan
Copyright Year	2006
Abstract	Several homologous series of steranes with alkyl side chains (C$_{1}$ to C$_{4}$) at the 3β position have been identified in the Jiyang Eogene lacustrine deposition. It is postulated that its precursors represent a new class of steroids, alkylated at the C-3 position with a polyhydroxy n-alkane. These precursors may have been formed by the bacterial addition of a ribose sugar to Δ$^{2}$-sterenes, diagenetic alteration products of steroids synthesized by eukaryotes. 3-alkyl steroids might substitute for hopanols in bacterial membranes. When they are present in a sample, the patterns of the isomer distributions of 3-alkyl steranes are similar to desmethyl steranes except for lower rearranged ones. It is shown that the configurational isomerization of 3-alkyl steranes is trending in line with that of desmethyl steranes with increasing of maturity. The abundance of 3-alkyl steranes may be controlled by the depositional environments; they are primary in saline or near shore lacustrine, moderate in shallow lacustrine, poor in sub-deep to deep lacustrine relative to the 4-methyl steranes.
Starting Page	1628
Ending Page	1632
Page Count	5
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	51
Issue Number	13
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	3-alkyl steranes lacustrine deposition GC-MS-MS Eogene Jiyang super-depression Chemistry/Food Science Geosciences Life Sciences Physics Engineering Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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