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.
Claims8
A mutant Streptococcus thermophilus strain which is a mutant of the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32502, wherein the mutant strain carries a mutation which renders the strain resistant to the bacteriophage CHPC1057 deposited at DSMZ under Accession Number DSM23962, and wherein the mutant strain has an acidification time less than 99% of that of the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32502.
A mutant Streptococcus thermophilus strain selected from the group consisting of the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32503, the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32504, the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32505, the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32506, and the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32507.
A mutant strain of Streptococcus thermophilus mother strain CHCC23369 deposited at DSMZ under Accession Number DSM32502, wherein the mutant strain is resistant to bacteriophage CHPC1057 deposited at DSMZ under Accession Number DSM23962, wherein the mutant strain has an increased texturizing capacity as compared to the mother strain, and an acidification time less than 99% that of the Streptococcus thermophilus strain deposited at DSMZ under Accession Number DSM32502.
Dependencies are inferred from the claim text.