METHOD FOR PRODUCTION OF LACTIC ACID BACTERIAE USEFUL FOR K2 VITAMIN PRODUCING AND THEIR APPLICATION FOR FOOD PRODUCTS PREPARATION Russian patent published in 2012 - IPC C12N15/01 C12P7/66 C12P1/04 A23L1/302 C12R1/225 

FIELD: food industry.

SUBSTANCE: method for production of Lactococcus lactis strain version producing, under standard fermentation conditions, a quantity of vitamin K₂ exceeding that produced by the stock/parent bacterial strain inoculated under the same conditions approximately 1.2 times, the said method including, at least: a) inoculation of the sock bacterial strain under standard fermentation conditions in a cultural medium causing a change in the oxidation-reduction state of a cell containing bacitracin or a peroxide and b) selection of the strain version if producing a quantity of vitamin K₂ exceeding that produced by the stock/parent bacterial strain inoculated under the same conditions approximately 1.2 times. Lactococcus lactis subsp.cremoris 1-3557 strain deposited in Collection CNCN of Pasteur Institute on 20.01.2006 and Lactococcus lactis subsp.cremoris 1-3558 strain deposited in Collection CNCM of Pasteur Institute on 20.01.2006 produce at least 1.2 times more vitamin K₂ than the stock/parent bacterial strain inoculated under the same conditions. Additionally, the invention deals with a lactic acid starter containing at least one of the above strains and to the method for preparation of a cultured milk product containing the above strain and/or the lactic acid starter.

EFFECT: invention enables increase of vitamin K₂ content in the product.

11 cl, 5 tbl