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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
PubMed
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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.

Related Experiment Videos

  • 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.