Anaerobic bacterial degradation of pristenes and phytenes in marine sediments does not lead to pristane and phytane during early diagenesis |
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| Institution: | 1. Aix-Marseille University, Mediterranean Institute of Oceanography (MIO), 13288, Marseille, Cedex 9; Université du Sud Toulon-Var, 83957, CNRS-INSU/IRD UM 110, France;2. CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart, Tasmania 7001, Australia;1. Spanish Geological Survey, Madrid, Spain;2. Dept. Earth and Environmental Sciences, Alicante University, Spain;3. Dept. Geological Sciences, University of Alabama, USA;4. IGEO, CSIC-UCM, Madrid, Spain;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;2. Research Institute of Petroleum Engineering of CNPC, Tanggu, Tianjin 300451, China;1. Morphodynamique Continentale et Côtière, Université de Caen Basse-Normandie, CNRS, 24, rue des Tilleuls, 14000 Caen, France;2. Littoral Environnements Sociétés, Université de La Rochelle, CNRS, 2, rue Olympe-de-Gouges, 17000 La Rochelle, France;1. Faculty of Petroleum, China University of Petroleum-Beijing, Karamay Campus, Karamay, 834000, Xinjiang, China;2. School of Energy Resource, China University of Geosciences, Beijing, 100083, China;3. Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada;4. Post-Doctoral Research Center, PetroChina Xinjiang Oilfield Company, Karamay, 834000, Xinjiang, China |
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| Abstract: | Anaerobic degradation of mixtures of isomeric pristenes and phytenes by sedimentary bacterial communities was investigated. These isoprenoid alkenes were quickly metabolized without formation of the corresponding alkanes. Identification of several bacterial metabolites allowed us to confirm the key role played by hydration in the metabolism of alkenes. Despite the increasing production of 5α-stanols during incubation, attesting to the involvement of biohydrogenation, this process did not act significantly on the double bond of pristenes and phytenes. Their resistance is attributed to the lack of binding polar group(s) to anchor the substrate to the enzyme and thus allow the double bond to reach the reductive catalytic site. It therefore seems that microbial hydrogenation of pristenes and phytenes does not account for the presence of pristane and phytane in recent sediments during early diagenesis. |
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