Occurrence and biomarker potential of 23-methyl steroids in diatoms and sediments

Sebastiaan W. Rampen; Stefan Schouten; Ellen C. Hopmans; Ben Abbas; Anna A. M. Noordeloos; Jan A. J. Geenevasen; J. Michael Moldowan; Peter Denisevich; Jaap S. Sinninghe Damste

doi:10.1016/j.orggeochem.2008.10.006

Occurrence and biomarker potential of 23-methyl steroids in diatoms and sediments

Sebastiaan W. Rampen, Stefan Schouten, Ellen C. Hopmans, Ben Abbas, Anna A. M. Noordeloos, Jan A. J. Geenevasen, J. Michael Moldowan, Peter Denisevich, Jaap S. Sinninghe Damste

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

23-Methyl sterols have been reported to be synthesized by a few marine algae, but unambiguous identification of 23-methyl steroids in sediments and petroleum is lacking. We report the presence of 23-methylcholesta 5,22E-dien-3 beta-ol in 14 out of 106 diatom cultures, thereby showing that diatoms, together with dinoflagellates, may be an important environmental source for such steroids. Synthesis of authentic 23-methylcholestanes showed that their mass spectra are identical to those of 24-methylcholestanes, but that they elute earlier on apolar stationary phases during gas chromatography (GC) analysis. Co-injection of the authentic standards with sediment extracts revealed the presence of these compounds in the Skole unit of the Oligocene Menelite Formation, the Miocene Monterey Formation,and the Messinian Vena del Gesso Formation. In addition, we tentatively identified 23,24-dimethyl-27norcholestanes in some of these sediments. Molecular clock calculations suggest that diatoms are a possible Source for 23-methyl steroids in sediments and petroleum from the late Jurassic onwards. (C) 2008 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	219-228
Number of pages	10
Journal	Organic Geochemistry
Volume	40
Issue number	2
DOIs	https://doi.org/10.1016/j.orggeochem.2008.10.006
Publication status	Published - Feb 2009
Externally published	Yes

Funding

The work was supported by the Dutch Technology Foundation (STW) Grant BAR-5275 and by Grant 853.00.020 from the ALW coupled Biosphere-Geosphere programme of the Netherlands Organisation for Scientific Research (NWO). We thank J.K. Volkman and P. Schaeffer for constructive comments.

Funders	Funder number
Dutch Technology Foundation	BAR-5275
ALW coupled Biosphere-Geosphere programme of the Netherlands Organisation for Scientific Research (NWO)	853.00.020

Keywords

Marine dinoflagellate
Toxic dinoflagellate
Karenia-brevis
Organic-matter
Fatty-acid
24-norcholestanes
Dinosterol
Petroleum
Origin
Age

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.orggeochem.2008.10.006

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abstract = "23-Methyl sterols have been reported to be synthesized by a few marine algae, but unambiguous identification of 23-methyl steroids in sediments and petroleum is lacking. We report the presence of 23-methylcholesta 5,22E-dien-3 beta-ol in 14 out of 106 diatom cultures, thereby showing that diatoms, together with dinoflagellates, may be an important environmental source for such steroids. Synthesis of authentic 23-methylcholestanes showed that their mass spectra are identical to those of 24-methylcholestanes, but that they elute earlier on apolar stationary phases during gas chromatography (GC) analysis. Co-injection of the authentic standards with sediment extracts revealed the presence of these compounds in the Skole unit of the Oligocene Menelite Formation, the Miocene Monterey Formation,and the Messinian Vena del Gesso Formation. In addition, we tentatively identified 23,24-dimethyl-27norcholestanes in some of these sediments. Molecular clock calculations suggest that diatoms are a possible Source for 23-methyl steroids in sediments and petroleum from the late Jurassic onwards. (C) 2008 Elsevier Ltd. All rights reserved.",

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AU - Noordeloos, Anna A. M.

AU - Geenevasen, Jan A. J.

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Occurrence and biomarker potential of 23-methyl steroids in diatoms and sediments

Abstract

Funding

Keywords

UN SDGs

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