STUDY ON THE OPTIMUM FERMENTATION CONDITION FOR PRODUCTION OF PROTOPECTINASE BY ASPERGILLUS SP / 微生物学通报

Effects of carbon resource, nitrogen resource, metal irons and surface detergents on the production of pro topectinase by strain Aspergillus sp XZ 131 were studied The results showed that pectin substances were essential for the strain to produce protopectinase The enzyme activity reached to 300 U/mL, when(NH 4) 2SO 4 and(NH 4) 2HPO 4 were used as nitrogen resource Ca 2+ and Tween 20 were able to enhance the production of the enzyme The optimum composition of the medium was citrus peel powder 1g,(NH 4) 2SO 4 2g,CaCl 2 0 015g,Tween 20 0 2mL,KH 2PO 4 3 8g,K 2HPO 4?3H 2O 0 2g,H 2O 100mL,pH 6 5。