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Related Experiment Videos

Recombinant brewer's yeast strains suitable for accelerated brewing.

M L Suihko1, K Blomqvist, M Penttilä

  • 1VTT, Biotechnical Laboratory, Espoo, Finland.

Journal of Biotechnology
|June 1, 1990
PubMed
Summary

Recombinant brewer's yeast strains engineered to reduce diacetyl formation significantly shorten beer production time. This innovation eliminates the need for lagering, reducing the total process to two weeks while maintaining beer quality.

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Area of Science:

  • Biotechnology
  • Fermentation Science
  • Microbial Genetics

Background:

  • Diacetyl is a key flavor compound in beer, often requiring a lengthy lagering period for reduction.
  • Controlling diacetyl levels is crucial for efficient beer production and consistent quality.

Purpose of the Study:

  • To engineer brewer's yeast Saccharomyces cerevisiae strains capable of reducing diacetyl formation.
  • To assess the impact of these engineered yeasts on beer production timelines and final product quality.

Main Methods:

  • Constructed recombinant brewer's yeast strains by introducing the alpha-ald gene from Klebsiella terrigena or Enterobacter aerogenes.
  • Linked the alpha-ald genes to yeast promoters (ADC1 or PGK1) on autonomously replicating plasmids.
  • Conducted pilot-scale brewing trials (50 L) using three engineered yeast strains.

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Main Results:

  • Engineered yeast strains significantly reduced diacetyl formation during fermentation, eliminating the need for lagering.
  • All brewing properties of the recombinant strains remained unaffected.
  • The quality of finished beer produced with engineered strains was comparable to that of the control strain.
  • Total beer production time was reduced from approximately 5 weeks to 2 weeks.

Conclusions:

  • Genetic engineering of brewer's yeast can effectively control diacetyl levels.
  • Reduced diacetyl formation leads to a substantial decrease in overall beer production time.
  • This approach offers a viable method for accelerating beer production without compromising quality.