*1.2.7 Treatment with glucoamylase of Aspergillus niger (GAA)*

Glucoamylases from *Aspergillus niger*, have been characterized by Fogarty and Kelly, 1979 The suitable pH for GAA is found to be in the range of 4.5–5.0 and an optimum temperature of GAA is 60°C. When corn mash was used as substrate, the optimum range of pH value reaches from 5.0 down to 3.4 [22, 25]. Thus, GAA is stable during fermentation. GAA was stable up to 70°C with an optimum at 65°C.
