Raw Starch-digestive Glucoamylase Productivity of Protease-less Mutant from Aspergillus awamori var. kawachi

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Mutation experiments were performed to decrease the protease productivity of Aspergillus awamori var. kawachi using ultraviolet light and N-methyl-N-nitro-N-nitrosoguanidine. The selected mutant HF-15 showed reductions in protease productivity of 93%, 84% and 50% in solid wheat bran culture, shaking Medium B and wheat bran cultures, respectively, as compared with the parent. Protease-less mutant HF-15 failed to produce α-mannosidase, and N-acety1-β-Dglucosaminidase productivity decreased by 35%. Mutant HF-15 specifically produced a high amount of raw starch-adsorbable and raw starch-digestive glucoamylase similar to GAI under all tested cultural conditions. On the contrary, high protease-producing mutant HF-10 produced a glucoamylase with very limited adsorption and digestion capacity on raw corn starch, and lower hydrolysis toward gelatinized potato starch and glycogen that was similar to GA I.
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