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An improved method for screening alpha-acetolactate producing mutants.

C Monnet1, S Haddad, G Corrieu

  • 1Laboratoire de Génie et Microbiologie des Procédés Alimentaires, Institut National de la Recherche Agronomique, Thiverval-Grignon, France. monnet@cardere.grignon.inra.fr

Journal of Microbiological Methods
|August 13, 1999
PubMed
Summary

Researchers developed an improved screening method to efficiently select alpha-acetolactate-deficient Lactococcus lactis mutants. This advancement aids in industrial production of diacetyl and alpha-acetolactate.

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Area of Science:

  • Microbiology
  • Industrial Biotechnology

Background:

  • Lactococcus lactis ssp. lactis biovar. diacelylactis strains are crucial for producing diacetyl and alpha-acetolactate in industrial applications.
  • Selection of alpha-acetolactate-deficient mutants is key for optimizing these processes.

Purpose of the Study:

  • To enhance the screening methodology for identifying alpha-acetolactate-deficient Lactococcus lactis mutants.
  • To improve the efficiency and throughput of mutant selection compared to existing methods.

Main Methods:

  • Random mutagenesis was employed to generate mutant strains.
  • A previously established screening method was significantly improved.
  • The enhanced method allows for screening up to 1000 colonies per agar plate.

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Main Results:

  • The improved screening method dramatically increases the number of colonies that can be screened.
  • This facilitates a more efficient selection of desired alpha-acetolactate-deficient mutants.
  • The new method is a substantial improvement over the previous capacity of 60 colonies per plate.

Conclusions:

  • The developed screening method offers a highly efficient approach for isolating specific Lactococcus lactis mutants.
  • This advancement supports optimized industrial production of diacetyl and alpha-acetolactate.
  • The improved throughput is critical for strain development in biotechnology.