Abstract
This paper describes a paste enzyme electrode based on a mediator-assisted electrical communication between redox active centers of glucose oxidase and graphite particles. The mediator is a solid inorganic redox salt composed of the Ru(NH3)63+ and Ru(CN)64- ions. The actual redox mediation is hypothesized to be accomplished by the paste-solubilized Ru(NH3)63+/Ru(NH3)62+ couple that shuttles electrons between the enzyme and the graphite powder. The paste enzyme electrode operates at a potential of 0.0 V vs. Ag/AgCl/3M NaCl and displays superior analytical properties in terms of high operational stability, freedom from interferences, fast response time, extended long term stability, and ease of preparation.
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