Method of producing Streptococcus thermophilus mutant strains
AssigneeChr. Hansen A/S
InventorsJeorgos Trihaas, Thomas Janzen, Patrick Derkx
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Abstract
The present invention is directed to a method of producing a Streptococcus thermophilus strain comprising the steps of a) Providing a mother strain in the form of Streptococcus thermophilus DSM32502, b) Growing a culture of the mother strain in the presence of a bacteriophage, to which the mother strain is not resistant, to obtain a number of mutant strains, which are resistant to the said bacteriophage, c) Measuring the acidification time of the bacteriophage-resistant mutant strains and the mother strain in a milk base and selecting at least one mutant strain with a reduced acidification time as compared to the mother strain to obtain a fast-acidifying mutant strain.
Claims10
A method of producing a Streptococcus thermophilus strain, comprising:
- (a) providing Streptococcus thermophilus strain CHCC23369 deposited at Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (DSMZ) under Accession Number DSM32502 as a mother strain,
- (b) growing a culture of the mother strain in the presence of a bacteriophage to which the mother strain is not resistant, to obtain a number of mutant strains resistant to the bacteriophage,
- (c) measuring an acidification time of the bacteriophage-resistant mutant strains and the mother strain in a milk base and selecting a mutant strain with a reduced acidification time as compared to the mother strain, to obtain a fast-acidifying Streptococcus thermophilus mutant strain.
Dependencies are inferred from the claim text.