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. 1987 Oct;53(10):2597–2599. doi: 10.1128/aem.53.10.2597-2599.1987

Stable Carbon Isotope Fractionation by Methanosarcina barkeri during Methanogenesis from Acetate, Methanol, or Carbon Dioxide-Hydrogen

J A Krzycki 1,†, W R Kenealy 1,‡, M J DeNiro 1, J G Zeikus 1,§,*
PMCID: PMC204153  PMID: 16347476

Abstract

Methanosarcina barkeri was cultured on methanol, H2-CO2, and acetate, and the 13C/12C ratios of the substrates and the methane produced from them were determined. The discrimination against 13C in methane relative to substrate decreased in the order methanol > CO2 > acetate. The isotopic fractionation for methane derived from acetate was only one-third of that observed with methanol as the substrate. The data presented indicate that the last enzyme of methanogenesis, methylreductase, is not the primary site of isotopic discrimination during methanogenesis from methanol or CO2. These results also support biogeochemical interpretations that gas produced in environments in which acetate is the primary methane precursor will have higher 13C/12C ratios than those from environments where other substrates predominate.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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