Methane oxidation and its coupled electron-sink reactions in ruminal fluid

H Kajikawa, C Valdes, K Hillman, R J Wallace, C J Newbold

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23 Citations (Scopus)


Aims: This study was conducted to investigate the occurrence of methane oxidation in the rumen, and to identify the electron-sink reaction coupled to the oxidation if it occurred.

Methods and Results: Mixed ruminal microbes taken from sheep were incubated with (CH4)-C-13 . Oxidation of methane, estimated from the flux of C-13 to CO2 and microbial cells, occurred, but represented only 0.2-0.5% of the methane produced. Methane oxidation was suppressed by the presence of oxygen, and was also inhibited by 2-bromoethane-sulphonate, and molybdate, but not by tungstate.

Conclusion, Significance and Impact of the Study: Methane could be oxidized anaerobically in the rumen by reverse methanogenesis in consort with sulphate reduction.

Original languageEnglish
Pages (from-to)354-357
Number of pages4
JournalLetters in Applied Microbiology
Issue number6
Publication statusPublished - Jun 2003


  • methane oxidation
  • nitrate reduction
  • oxygen
  • rumen
  • sulphate reduction
  • mixed rumen microorgansims
  • methanogenic bacteria
  • sulfate reduction
  • ovine rumen
  • sediments
  • samples


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