EC 3.2.1.78 From A. niger. Electrophoretically homogeneous. In 3.2 M ammonium sulphate. Specific activity: 38 U/mg (40°C, pH 4.0, carob galactomannan as substrate). Contaminants: β-mannosidase and α-galactosidase< 0.001%. Stable at 4°C for > 4 years.