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Korean Journal of Chemical Engineering, Vol.21, No.1, 201-205, 2004
Penicillium sp. ZD-Z1 Chitosanase Immobilized on DEAE Cellulose by Cross-linking Reaction
Chitosanase obtained from Penicillium sp.ZD-Z1 was immobilized on DEAE cellulose with glutaraldehyde by cross-linking reaction. The optimal conditions of immobilization were as follows: 0.1 g DEAE cellulose was treated with 5 ml 5% glutaraldehyde solution; then 2.3 mg chitosanase was immobilized on the carrier. The optimal temperature and pH was 60 ℃ and 4.0, and the Km value was 18.87 g/L. Under optimal conditions, the activity of immobilized enzyme is 1.5 U/g, and the recovery of enzyme activity is 81.3%. After immobilization, the optimal temperature and Km value increased (from 50 ℃ to 60 ℃, from 2.49 g/L to 18.87 g/L), whereas the optimal pH was reduced (from 5.0 to 4.0). The enzyme activity loss was less than 20% after 10 times batch reaction; the immobilized enzyme showed good operation stability.
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