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J Biotechnol. 2014 Jun 20;180:66-9. doi: 10.1016/j.jbiotec.2014.04.001. Epub 2014 Apr 8.

Quantification of methanogenic heterodisulfide reductase activity in biogas sludge.

Author information

  • 1Institute of Microbiology and Biotechnology, 168 Meckenheimer Allee, 53115 Bonn, Germany.
  • 2Institute of Microbiology and Biotechnology, 168 Meckenheimer Allee, 53115 Bonn, Germany. Electronic address: udeppen@uni-bonn.de.

Abstract

Methanogenic archaea are essential for the production of methane in biogas plants. Here we present enzymatic test systems for the analysis of the metabolic activity of methanogens based on the heterodisulfide reductase reaction. The first rapid test shows that heterodisulfide reductase can be detected in 1 g of biogas sludge after sonication and centrifugation. The resulting cell lysate used reduced methylviologen for heterodisulfide reduction, a reaction that is specifically catalyzed by methanogenic heterodisulfide reductase. In the second test cell lysate from 60 g of biogas sludge was separated by ultracentrifugation. Both, cytoplasmic membrane and cytoplasmic fractions revealed heterodisulfide reductase activity, indicating the presence of hydrogenotrophic and aceticlastic methanogens, respectively.

Copyright © 2014 Elsevier B.V. All rights reserved.

KEYWORDS:

Biogas plant; Fermentation; Methane; Methanogenesis; Methanogenic archaea

PMID:
24721213
[PubMed - in process]
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