METHOD OF BAKER'S YEAST PRODUCING Russian patent published in 1997 - IPC

FIELD: biotechnology. SUBSTANCE: baker's yeast Saccharomyces cerevisiae is cultured on medium containing carbon, nitrogen and phosphorus sources. Ortho-phosphoric acid is used as a single phosphorus source that is added once to head fermenter after cultural fluid removing and to commercial fermenters before culturing onset at amount 5-10 l/1 t yeast increment. Once feeding ortho-phosphoric acid ensures to decrease pH of cultural fluid to value inhibiting bacterial microflora growth but activates processes of RNA synthesis that makes conditions for the following active growth. Ortho-phosphoric can be dosed additionally if actual biomass increment will exceed the calculated one in order to eliminate process limitation by phosphorus. Signal of this limitation onset is phosphorus concentration decrease in cultural fluid below 0.006%. EFFECT: improved method of yeast producing. 2 cl, 3 tbl