Abstract Carrageenase were produced by Bacillus amyloliquefaciens, which fermented with carrageen as inductor. The optimal condition of zymosis and degradation determined by viscosity change was achieved: liquid seed inoculate 2%, carrageen terminal concentration was 0.1% in the solid leavening, and degrading temperature of 50℃, pH 5, the enzyme quantity was 0.5：1（w/w）. Its molecular weight came down from 1296kDa to 1660Da.
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