表面可更新的石墨陶瓷葡萄糖生物传感器研究

Renewable-surface graphite-ceramic glucose biosensor

A surface-renewable glucose biosensor is reported. The glucose biosensor is developed using glucose oxidase (GOD) encapsulated in organically modified solgel glass (ORMOSIL) network in the composite matetial. The organic group in the ORMOSIL network controls the hydrophobicity of the electrode surface and thus limits the wettability of the electrode surface. The graphite powder provides the conductivity for the electrode.Ferrocenecarboxylic acid in phosphate buffer solution (pH 7.0) transfers electron between enzyme and electrode. Cyclic volammetry and amperometric measurements have been used to exmine the electrochemical behavior of glucose biosensor as shown in Fig. 1 and Fig.2. The electrode gives a linear response range of 1 -20mM glucose with a sensitivity of 3.26 μA· mM-1. The electrode can be renewed easily in reproducible manner by a simple polishing step.