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. 1986 May;51(5):1056–1062. doi: 10.1128/aem.51.5.1056-1062.1986

Growth of Methanogenic Bacteria in Pure Culture with 2-Propanol and Other Alcohols as Hydrogen Donors

Friedrich Widdel 1
PMCID: PMC239010  PMID: 16347050

Abstract

Two types of mesophilic, methanogenic bacteria were isolated in pure culture from anaerobic freshwater and marine mud with 2-propanol as the hydrogen donor. The freshwater strain (SK) was a Methanospirillum species, the marine, salt-requiring strain (CV), which had irregular coccoid cells, resembled Methanogenium sp. Stoichiometric measurements revealed formation of 1 mol of CH4 by CO2 reduction, with 4 mol of 2-propanol being converted to acetone. In addition to 2-propanol, the isolates used 2-butanol, H2, or formate but not methanol or polyols. Acetate did not serve as an energy substrate but was necessary as a carbon source. Strain CV also oxidized ethanol or 1-propanol to acetate or propionate, respectively; growth on the latter alcohols was slower, but final cell densities were about threefold higher than on 2-propanol. Both strains grew well in defined, bicarbonate-buffered, sulfide-reduced media. For cultivation of strain CV, additions of biotin, vitamin B12, and tungstate were necessary. The newly isolated strains are the first methanogens that were shown to grow in pure culture with alcohols other than methanol. Bioenergetic aspects of secondary and primary alcohol utilization by methanogens are discussed.

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Selected References

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