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The immobilization of alpha-amylase and glucoamylase was investigated by several coupling methods on silica carriers, different types of Silokhroms, and silica gels. The most active immobilized mold and bacterial alpha-amylases and mold glucoamylase were obtained with titanium salts. These activities were twice the value of that obtained by glutaraldehyde or azo coupling. The half-lives of A. oryzae alpha-amylase, B. subtilis alpha-amylase, and A. niger glucoamylase, immobilized to silica carriers at 45 degrees C and under continuous operation at a high concentration of substrate, were 14, 35, and 65 days, respectively.
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