BATCH PROCESS OF GROWING PURE CULTURE YEAST FOR BREWING AND DEVICE TO THIS END Russian patent published in 2008 - IPC C12C11/00 C12N1/18 

FIELD: chemistry; distillation industry.

SUBSTANCE: present invention pertains to brewing. The batch process of growing pure yeast culture for brewing involves putting pure yeast culture into a propagator together with a pre-calculated amount of sterile nutrient solution, which is in form of beer wort. The mixture is matured with periodical aeration for growing a yeast biomass. The pure yeast culture and the sterile beer wort are put into the propagator in ratio of (0.5-4.0):(4.0-0.5). The mixture is matured and aerated with continuous addition of the remaining pre-calculated amount of beer wort. The rate of addition is controlled by the number of yeast cells in the biomass, maintaining a constant number of cells, corresponding to a logarithmic propagation phase. The wort is sterilised in a stream with subsequent cooling down to fermentation temperature or lower by 1-3°C, directly before putting into the propagator. Continuous supply of sterile beer wort is carried out based on maintaining cell content of 40-150 million cells/ml for a period of 12-24 hours in the yeast biomass. The device for growing a pure yeast culture for brewing comprises a propagator, a system for aerating the yeast mass and a system for producing a sterile nutrient solution. The device also has a container for non-sterile nutrient solution, joined to the propagator through a sterilisation system, as well as a sterilisation installation and cooler. The device also contains a system for continuous supply of cooled sterile nutrient solution into the propagator, which comprises apparatus for maintaining and controlling the number of yeast cells and temperature of the nutrient solution. The sterilisation system can contain an intermediate container, put between the cooler and the propagator.

EFFECT: shorter period of obtaining pure yeast culture, improved quality, reduced risk of infection and increased quality factors of the final product.

4 cl, 6 dwg, 2 tbl, 2 ex