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Received May 15, 2003
Accepted September 3, 2003
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Penicillium sp. ZD-Z1 Chitosanase Immobilized on DEAE Cellulose by Cross-linking Reaction

Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China
Korean Journal of Chemical Engineering, January 2004, 21(1), 201-205(5), 10.1007/BF02705399
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Abstract

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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