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Open Access Nano Express

Bioconjugates of Glucose Oxidase and Gold Nanorods Based on Electrostatic Interaction with Enhanced Thermostability

Zhanfang Ma* and Teng Ding

Author Affiliations

Department of Chemistry, Capital Normal University, 100048, Beijing, People’s Republic of China

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Nanoscale Research Letters 2009, 4:1236-1240  doi:10.1007/s11671-009-9385-8

Published: 15 July 2009

Abstract

Bioconjugates made up of an enzyme and gold nanorods (GNRs) were fabricated by electrostatic interactions (layer-by-layer method, LBL) between anionic glucose oxidase (GOD) and positively charged GNRs. The assembled processes were monitored by UV–Vis spectra, zeta potential measurements, and transmission electron microscopy. The enzyme activity assays of the obtained bioconjugates display a relatively enhanced thermostability behavior in contrast with that of free enzyme. Free GOD in solution only retains about 22% of its relative activity at 90 °C. Unexpectedly, the immobilized GOD on GNRs still retains about 39.3% activity after the same treatment. This work will be of significance for the biologic enhancement using other kinds of anisotropic nanostructure and suggests a new way of enhancing enzyme thermostability using anisotropic metal nanomaterials.

Keywords:
Gold nanorods; Enzyme thermostability; Glucose oxidase; Polyelectrolytes