[Optimal conditions of alpha-amylase production by Aspergillus oryzae in liquid media].

The alpha-amylase secretion in a mineral culture medium containing starch and glucose follow the lysis of mycelium. This lysis seems to result from the hydrolysing action of dextranase and levulanase on cell wall. Cell lysis and amylase secretion are greatly enhanced by pH elevation of culture medium (optimal pH 8,8). In such conditions of production the amylase is not stable but can be stabilized by addition of starch. A method is described using pH and starch content modifications, which allows to obtain an amylase production three times greater than in standard culture medium.