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A thermophilic Alicyclobacillus acidocaldarius, which produces thermostable α-amylase, was isolated from the hot water effluent of a boiled rice mill near Tirupati, Andhra Pradesh, India. The effect of different culture conditions on the growth and production of extracellular α-amylase by thermophilic A. acidocaldarius was investigated in laboratory scale. The results showed that the optimum conditions for the production of α-amylase are a temperature of 60°C, pH of 6.0, and medium starch concentration of 1.0%, and yeast extract and tryptone of 0.2%. Surfactants, like Tween-20 and SDS, up to 0.02%, were found to increase the bacterial growth and enzymes. Further increase in their concentration resulted in significantly decreased enzyme production.

Isolation and Culture Medium Optimization for Thermostable Extracellular α-Amylase Production by Thermophilic Alicyclobacillus acidocaldarius