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Immobilization of glucose oxidase on Fe3O4/SiO2 magnetic nanoparticles
Jun Huang1, Rong Zhao, Hai Wang
1Key Laboratory of Fiber Optic Sensing Technology and Information Processing of Ministry of Education, Wuhan University of Technology, 430070, Wuhan, China. hjun@whut.edu.cn
Abstract:
Glucose oxidase (GOD) was covalently immobilized onto Fe(3)O(4)/SiO(2) magnetic nanoparticles (FSMNs) using glutaraldehyde (GA). Optimal immobilization was at pH 6 with 3-aminopropyltriethoxysilane at 2% (v/v), GA at 3% (v/v) and 0.143 g GOD per g carrier. The activity of immobilized GOD was 4,570 U/g at pH 7 and 50 degrees C. The immobilized GOD retained 80% of its initial activity after 6 h at 45 degrees C while free enzyme retained only 20% activity. The immobilized GOD maintained 60% of its initial activity after 6 cycles of repeated use and retained 75% of its initial activity after 1 month at 4 degrees C whereas free enzymes retained 62% of its activity.
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