INFLUENCE OF MEDIA COMPOSITION ON THE PRODUCTION OF ALPHA-AMYLASE AND AMYLOGLUCOSIDASE BY A STRAIN OF ASPERGILLUS-NIGER

The nature of thermophilic amylolytic enzymes produced by a strain of Aspergillus niger Van Tieghem was influenced by media composition. While glucose, maltose, dextrin and soluble starch induced the production of amyloglucosidase, pectin and sodium polypectate almost exclusively induced the formation of α‐amylase. Alkali ions suppressed the formation of amyloglucosidase. NH4NO3, (NH4)2HPO4 and (NH4)2C4H4O6 served as good inorganic nitrogen sources, while casein, groundnut protein and corn steep liquor served to a similar capacity as nitrogen sources from organic material. Deletion of the growth factors pyridoxine‐hydrochloride and inositol suppressed enzyme production, while the absence of riboflavin had the opposite effect. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim