EC 3.2.1.20 CAZY Family: GH31 From A. niger. In 3.2 M ammonium sulphate. Specific activity: 70 U/mg (40°C, pH 4.5, maltose as substrate). 2.5 U/mg (phenyl α-glucoside as substrate). Contaminants: α-amylase < 0.001%; amyloglucosidase < 0.01%. Stable at 4°C for > 4 years.