The role of acetaldehyde and glycerol in the adaptation to ethanol stress of saccharomyces cerevisiae and other yeasts

  • Vriesekoop F
  • Haass C
  • Pamment N
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Abstract

Ethanol inhibition is a commonly encountered stress condition during typical yeast fermentations and often results in reduced fermentation rates and production yields. While past studies have shown that acetaldehyde addition has a significant ameliorating effect on the growth of ethanol-stressed Saccharomyces cerevisiae, this study investigated the potential ameliorating effect of acetaldehyde on a wide range of ethanol-stressed yeasts. Acetaldehyde does not appear to be a universal ameliorating agent for yeasts exposed to ethanol stress. It is also shown that as a result of an ethanol stress, most yeasts rapidly produce glycerol as an alternative means of NAD(+) regeneration rather than having a specific requirement for glycerol. The results strongly suggest that both ethanol and acetaldehyde exposure have a direct effect on the cellular NAD(+)/NADH ratio, which can manifest itself as modulations in glycerol production.

Author-supplied keywords

  • Acetaldehyde
  • Ethanol stress
  • Glycerol
  • Redox
  • Yeast

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Authors

  • Frank Vriesekoop

  • Cornelia Haass

  • Neville B. Pamment

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