title: Effects of immobilization on the kinetics of enzyme-catalyzed reactions. I. Glucose oxidase in a recirculation reactor system.
abstract: Glucose oxidase from Aspergillus niger was immobilized on nonporous glass beads by covalent bonding and its kinetics were studied in a packed-column recycle reactor. The optimum pH of the immobilized enzyme was the same as that of soluble enzyme; however, immobilized glucose oxidase showed a sharper pH-activity profile than that of the soluble enzyme. The kinetic behavior of immobilized glucose oxidase at optimum pH and 25 degrees C was similar to that of the soluble enzyme, but the immobilized material showed increased temperature sensitivity. Immobilized glucose oxidase showed no loss in activity on storage at 4 degrees C for nearly ten weeks. On continuous use for 60 hr, the immobilized enzyme showed about a 40% loss in activity but no change in the kinetic constant.
mesh_terms: D005898:Glass; D005947:Glucose; D005949:Glucose Oxidase; D007700:Kinetics; D008956:Models, Chemical; D010100:Oxygen; D013696:Temperature; D013997:Time Factors
chemical_list: D005949:Glucose Oxidase; D005947:Glucose; D010100:Oxygen