文摘
β-Galactosidase production conditions (induction time, temperature, concentration of lactose, etc) were optimized in a 3-L fermentor. The highest extracellular enzyme activity was 18.5-fold that of the original extracellular enzyme activity in 3-L fermenter. Peak extracellular β-galactosidase activity reached 220.0 U mL−1.