Abstract
Enzymatic properties of α-chymotrypsin covalently immobilized on magnetite particles via graft polymerization of acrylic acid were investigated. Graft polymerization was carried out in a redox system consisting of mercapto groups introduced onto the surfaces of magnetite particles and ceric ions. α-Chymotrypsin was immobilized on magnetite particles by condensation with the carboxyl groups of the grafted poly(acrylic acid). The amount of α-chymotrypsin immobilized on 1 g of magnetite was 13—17 mg and the activity of the immobilized α-chymotrypsin (at 37°C, pH 8.0) was 70% the maximum activity of the native enzyme. Due to immobilization, optimum pH for α-chymotrypsin shifted to a slightly higher value, whereas optimum temperature did not change. A kinetic study of the enzymatic reaction with immobilized α-chymotrypsin showed that the immobilization limited accessibility of substrate molecules to the active sites of the enzyme but caused little decrease of the maximum reaction rate. In water at 37°C, immobilized α-chymotrypsin kept 93% of its original activity over a period of 25 days, though the native enzyme was completely deactivated within 5 days by autolytic denaturalization.
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Shimomura, M., Ohta, M., Sugiyama, N. et al. Properties of α-Chymotrypsin Covalently Immobilized on Poly(acrylic acid)-Grafted Magnetite Particles. Polym J 31, 274–278 (1999). https://doi.org/10.1295/polymj.31.274
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DOI: https://doi.org/10.1295/polymj.31.274