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Bridging the Bio-Electronic Interface with Biofabrication
Published on: June 6, 2012
Electron transfer mediated by glucose oxidase at the liquid/liquid interface
D G Georganopoulou1, D J Caruana, J Strutwolf
1Department of Chemistry, University College London, 20 Gordon St, London, UK WC1H 0AJ.
Faraday Discussions
|February 24, 2001
Summary
Researchers studied glucose oxidase reactivity at an organic/aqueous interface using electrochemistry. They observed interfacial enzyme reactions distinct from bulk reactions, suggesting a role for protein-surfactant films.
Area of Science:
- Biophysical Chemistry
- Electrochemistry
- Enzyme Kinetics
Background:
- Membrane-bound redox enzymes are crucial in biological systems.
- Electrochemical methods offer a way to study enzyme reactivity at interfaces.
- Understanding interfacial enzyme behavior is key for bioelectronic applications.
Purpose of the Study:
- To establish an experimental basis for studying membrane-bound redox enzyme reactivity.
- To investigate the electrochemical behavior of glucose oxidase at an organic/aqueous interface.
- To differentiate interfacial enzyme reactions from bulk reactions.
Main Methods:
- Studied glucose oxidase adsorbed at a dichloroethane/water interface.
- Utilized electrogenerated dimethyl ferricenium as a mediator in the organic phase.
- Measured feedback current to assess mediator recycling near the interface.
- Employed a surfactant to suppress interfacial self-exchange reactions.
Main Results:
- Observed turnover of aqueous glucose mediated by the organic phase.
- Successfully distinguished interfacial enzyme reactions from bulk aqueous phase reactions.
- Demonstrated suppression of an unexpected ferrocene self-exchange reaction via surfactant adsorption.
- Conjectured reaction occurring within a protein-surfactant film at the interface.
Conclusions:
- Electrochemical studies at organic/aqueous interfaces can probe membrane-bound enzyme reactivity.
- Interfacial enzyme reactions exhibit distinct characteristics from bulk reactions.
- Protein-surfactant film formation at the interface likely influences enzyme activity.
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