Journal
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
Volume 45, Issue 3-4, Pages 84-90Publisher
ELSEVIER
DOI: 10.1016/j.molcatb.2006.11.009
Keywords
magnetic nanogels; immobilized enzyme; photochemical polymerization; alpha-chymotrypsin
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A new aminated carrier-magnetic nanogels covered by amino groups, was obtained by Hoffman degradation of polyacrylamide-coated Fe3O4 nanoparticles prepared by photochemical polymerization. alpha-Chymotrypsin (CT) was covalently bound to the magnetic nanogels by use of 1-ethyl3-(3-dimethylaminepropyl) carbodiimide and N-hydroxysuccinimide at room temperature. Immobilization time, pH value of the reaction mixture and proportion of CT to the magnetic nanogels were investigated to obtain the optimum condition for CT immobilization. The maximal specific activity of the bound CT was determined to be 0.93 U/(mg min), 59.3% of free counterpart. The maximal binding capacity was measured to be 102 mg enzyme/g nanogel. Furthermore, the bound CT exhibited good thermal stability, storage stability and reusability. (c) 2007 Elsevier B.V. All rights reserved.
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