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Diffusion-controlled detection of glucose with microelectrodes in mediated bioelectrocatalytic oxidation.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry (2013-03-12)
Tatsuo Noda, Mizue Wanibuchi, Yuki Kitazumi, Seiya Tsujimura, Osamu Shirai, Masahiro Yamamoto, Kenji Kano
ABSTRACT

This paper describes a diffusion-controlled electrolysis of glucose with mediated bioelectrocatalysis at microdisk-electrodes. Under conditions of an extremely fast enzyme reaction, compared with the diffusion of glucose, the current in potential-step chronoamperometry reaches an almost steady state within 10 s, and is proportional to the glucose concentration. The current can be detected at +0.1 V (vs. Ag|AgCl) with 9,10-phenanthrenequinone as a mediator. The addition of carboxymethylcellulose increased the linear range up to 10 mM.

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