Abstract
A new carrier-free cross-linked aggregates of cellulase (CLEAs-C) via precipitation with ammonia sulfate and cross-linking with glutaraldehyde was prepared. Efficient enzyme activity was obtained when cellulase and glutaraldehyde concentration was 50mg/mL and 3% (v/v) respectively. The cross-linking time and temperature were also important parameters for immobilization. Optimal temperature and pH of the CLEA–C were evaluated. The CLEAs-C displayed good stabilities, after stored at 4○C for 28 days storage, the CLEAs retained more than 80% initial activities.
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