Characterization of the purified enzymes revealed that α-amylase was unstable at acidic pH and less resistant to heat
(stable at b40 °C) than glucoamylase. When these culture conditions were applied to enzyme production in red koji, reducing
the temperature from 35 °C to 25 °C for 48 h in the late stages of growth resulted in higher glucoamylase and α-amylase
production (1.4 and 18 times, respectively) with a concomitant increase in protein stability.