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Aspects on mediated glucose oxidation at a supported cubic phase.
Mahdi Shahmohammadi Aghbolagh1, Mohammad Yaser Khani Meynaq1, Kenichi Shimizu1
1Department of Chemistry, Umeå University, SE901 87 Umeå, Sweden.
Bioelectrochemistry (Amsterdam, Netherlands)
|July 4, 2017
Summary
This study explores using a liquid crystalline cubic phase with glucose oxidase as a bio-anode for biofuels. Mediator transport in the cubic phase limits the glucose oxidation reaction rate.
Area of Science:
- Electrochemistry
- Biomaterials
- Biocatalysis
Background:
- Supported liquid crystalline cubic phases offer potential as bio-anodes in biofuel applications.
- Encapsulating enzymes like glucose oxidase within these phases is key for bio-anode functionality.
Purpose of the Study:
- To investigate the mediated enzymatic oxidation of glucose using ferrocene-carboxylic acid as a mediator.
- To clarify aspects of bio-anode performance within a liquid crystalline cubic phase housing glucose oxidase.
Main Methods:
- Cyclic voltammetry was employed to study the bio-anode system at varying scan rates and temperatures (15°C to 30°C).
- The system involved glucose oxidase housed in mono-olein cubic phase water channels, with glucose and ferrocene-carboxylic acid in solution.
Main Results:
- Diffusion coefficients and film resistance were estimated, revealing decreased mass-transport properties at lower temperatures.
- Increased current from glucose oxidation was observed with decreasing film thickness.
- Mediator transport within the cubic phase was identified as the rate-limiting step.
Conclusions:
- The liquid crystalline cubic phase system demonstrates functional bio-anode capabilities for glucose oxidation.
- Temperature significantly impacts mass-transport properties and overall reaction efficiency.
- Optimizing mediator transport within the cubic phase is crucial for enhancing bio-anode performance.
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