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Published on: September 19, 2017
Diffusion-controlled detection of glucose with microelectrodes in mediated bioelectrocatalytic oxidation
Tatsuo Noda1, Mizue Wanibuchi, Yuki Kitazumi
1Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto, Japan.
Summary
This study presents a new method for glucose detection using mediated bioelectrocatalysis. The developed electrochemical sensor shows a steady-state current proportional to glucose concentration for improved biosensing applications.
Area of Science:
- Electrochemistry
- Biocatalysis
- Biosensors
Background:
- Electrochemical methods are crucial for detecting biomolecules.
- Mediated bioelectrocatalysis offers a sensitive approach for analyte detection.
- Microdisk electrodes provide a platform for electrochemical studies.
Purpose of the Study:
- To develop a diffusion-controlled electrolysis method for glucose detection.
- To investigate the use of mediated bioelectrocatalysis at microdisk electrodes for glucose sensing.
- To optimize the electrochemical detection of glucose concentration.
Main Methods:
- Diffusion-controlled electrolysis of glucose.
- Mediated bioelectrocatalysis using 9,10-phenanthrenequinone.
- Potential-step chronoamperometry at microdisk electrodes.
- Enzyme kinetics under diffusion limitation.
Main Results:
- Achieved an almost steady-state current within 10 seconds, proportional to glucose concentration.
- Detected glucose at +0.1 V (vs. Ag|AgCl) using 9,10-phenanthrenequinone as a mediator.
- Extended the linear detection range of glucose up to 10 mM by adding carboxymethylcellulose.
Conclusions:
- The developed method enables sensitive and rapid glucose detection.
- Mediated bioelectrocatalysis at microdisk electrodes is effective for glucose sensing.
- Optimization with carboxymethylcellulose enhances the sensor's linear range for practical applications.
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