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Effects of alcohols on the respiration and fermentation of aerated suspensions of baker's yeast

Carlsen, Helle N, Degn, Hans and Lloyd, David 1991. Effects of alcohols on the respiration and fermentation of aerated suspensions of baker's yeast. Microbiology 137 (12) , 2879--2883.

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Abstract

The immediate effects of externally added alcohols on CO2 production and O2 consumption of suspensions of washed, aerated baker's yeast were studied by stopped-flow membrane inlet mass spectrometry. Glucose-supported fermentation was progressively inhibited by increasing ethanol concentration (0-20%, v/v). The inhibition by ethanol was quite different from that observed for acetaldehyde; thus it is unlikely that toxicity of the latter can account for the observed effects. For five different alkanols (methanol, ethanol, I-propanol, 2-propanol and I-butanol) increasing inhibition of anaerobic fermentation was correlated with increased partition coefficients into a hydrophobic milieu. This suggests that the action of ethanol is primarily located at a hydrophobic site, possibly at a membrane. Results for respiratory activities were not as definite as for those for anaerobic metabolism because some alkanols act as respiratory substrates as well as giving inhibitory effects.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Biosciences
Publisher: Microbiology Society
ISSN: 1350-0872
Date of Acceptance: 5 September 1991
Last Modified: 05 Mar 2020 14:30
URI: http://orca.cf.ac.uk/id/eprint/127761

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