The properties of purified amylase enzyme like optimum pH, temperature and substrate concen-tration are given in Tables 5 to 7, respectively. The enzyme extracted from four different Aspergillus species exhibits maximum activity at pH 7.0. The selection of optimum pH is very essential for the production of amylase (Pugalenthi et al., 2011). Maximum enzyme production of enzyme occurred at pH 7, very little growth was observed without enzyme production in medium at initial pH of 3 to 4. α -Amylases are generally stable over a wide range of pH from 4 to 11, though some are only stable within a narrow pH range (Kumar et al., 2012). These results suggest that the enzyme was not very sensitive to the change of pH. Therefore, the enzyme may have widespread application in many industrial
sectors.