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. 1989 Jan;55(1):21–28. doi: 10.1128/aem.55.1.21-28.1989

Inhibition of Yeast Growth by Octanoic and Decanoic Acids Produced during Ethanolic Fermentation

Cristina A Viegas 1, M Fernanda Rosa 1, Isabel Sá-Correia 1,*, Júlio M Novais 1
PMCID: PMC184048  PMID: 16347826

Abstract

The inhibition of growth by octanoic or decanoic acids, two subproducts of ethanolic fermentation, was evaluated in Saccharomyces cerevisiae and Kluyveromyces marxianus in association with ethanol, the main product of fermentation. In both strains, octanoic and decanoic acids, at concentrations up to 16 and 8 mg/liter, respectively, decreased the maximum specific growth rate and the biomass yield at 30°C as an exponential function of the fatty acid concentration and increased the duration of growth latency. These toxic effects increased with a decrease in pH in the range of 5.4 to 3.0, indicating that the undissociated form is the toxic molecule. Decanoic acid was more toxic than octanoic acid. The concentrations of octanoic and decanoic acids were determined during the ethanolic fermentation (30°C) of two laboratory media (mineral and complex) by S. cerevisiae and of Jerusalem artichoke juice by K. marxianus. Based on the concentrations detected (0.7 to 23 mg/liter) and the kinetics of growth inhibition, the presence of octanoic and decanoic acids cannot be ignored in the evaluation of the overall inhibition of ethanolic fermentation.

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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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