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Using sterol biomarkers in paleoecological studies

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Using sterol biomarkers in paleoecological studies

Mouradian, Maggy (2005) Using sterol biomarkers in paleoecological studies. Masters thesis, Concordia University.

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Abstract

Sediments from five contrasting stations in the western Mexican margin (Pacific Ocean) were investigated for sterol distribution and organic-walled dinoflagellate cysts (dinocysts). Sub-samples were taken from depths of 3-6cm and 16-27cm, representing different environmental conditions. In general, the sterol concentrations examined from these sites showed more advanced degradation in the deeper sediments compared to samples near the sediment-water interface. Using a molecular-level gas chromatography (GC) approach, 23 sterols of marine and terrigenous sources were identified in the natural samples. The major sterol components detected in most of these sediments were cholest-5-en-3β-ol (cholesterol), 24-methylcholesta-5,22E-dien-3β-ol (brassicasterol or dihydrobrassicasterol) and 24-Ethylcholesta-5,22E-dien-3β-ol (stigmasterol). This method also enabled the identification of a specific biomarker of a eukaryotic organism, 4{460},23,24-trimethyl-5{460}-cholest-22 E-en-3β-ol (dinosterol), indicating dinoflagellate inputs to marine sedimentary organic matter

Divisions:Concordia University > Faculty of Arts and Science > Chemistry and Biochemistry
Item Type:Thesis (Masters)
Authors:Mouradian, Maggy
Pagination:ix, 89 leaves : ill. (some col.) ; 29 cm.
Institution:Concordia University
Degree Name:M. Sc.
Program:Chemistry and Biochemistry
Date:2005
Thesis Supervisor(s):Gélinas, Yves
ID Code:8465
Deposited By:Concordia University Libraries
Deposited On:18 Aug 2011 14:26
Last Modified:18 Aug 2011 15:28
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