We report constitutive production of glucose isomerase (GI) under submerged growth of Aspergillus sp. in glucose phosphate broth (GPB). The fungus produced significant quantities of extracellular GI in GPB without supplementing the inducer (xylose). The maximum biomass (872 mg) and highest level of GI (1126 U) were obtained in 42 h at 30°C and 120 rpm. Equal level of biomass and enzyme were produced in GPB with glucose and xylose, but
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