Abstract
he combined effect of depressed water activity (a) and glucose addition on the production of extracellular pectinases and protease by Aspergillus niger 148 was studied. A differential response in the production of enzyme activities was observed. Glucose (0.7%) acted as catabolite repressor for all the enzymes at a=1 and at a=0.975 for pectinesterase, pectinlyase and protease. For polygalacturonase at a=0.975 a synergistic stimulating effect was observed. By depressing a a pectinase complex containing mainly pectinlyase and polyglalacturonase could be obtained.
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