PRODUCTION METHOD OF GLUCAN-CHITOSAN COMPLEX FROM YEAST BIOMASS OF BREWING WASTE Russian patent published in 2013 - IPC C12P19/04 C08B37/08 C12N1/18 

FIELD: biotechnologies.

SUBSTANCE: production method of glucan-chitosan complex from yeast biomass of brewing waste involves mechanical and ultrasonic treatment of yeast biomass, destruction of proteins by treatment of the obtained suspension using alkali reagents with further extraction of a target product. As biomass, Saccharomyces living yeast is used. First, yeast is frozen to -15°C during 24 hours. After mechanical destruction, biomass is treated for 15 minutes at 20°C in an ultrasonic bath with frequency of an emitter of 35 kHz and voltage of 285 W. Biomass is acidified with chlorhydric acid till pH=5.5 and treated with ferment preparation in the amount of one pellet containing lipase - 3500 units of Ph.Eur., amylase - 4200 units of Ph.Eur. and protease - 250 units of Ph.Eur. per kilogramme of biomass in terms of dry substance; then, lipid components of yeast are removed. Fermentation is performed at t=20-29°C during 30-60 minutes. Destruction of proteins is performed at 55°C by means of a water bath during 60 minutes by treatment using 4% water solution of caustic soda at the ratio of yeast biomass and alkali, which is equal to 1:4. The medium is neutralised and hydrosol of glucan-chitosan complex is deposited by centrifugation during 10 minutes. The deposit is dried at t=55°C during 48 hours.

EFFECT: invention allows improving the quality of the obtained complex and its biological activity.

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