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Regenerable biosensor platform: a total internal reflection fluorescence cell with electrochemical control

A N Asanov1, W W Wilson, P B Oldham

  • 1Department of Chemistry, Mississippi State University, Mississippi 39762, USA.

Analytical Chemistry
|April 8, 1998
PubMed
Summary
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This study introduces a novel biosensor platform enabling simultaneous fluorescence detection and electrochemical control of molecular binding. Electrochemical control successfully regenerated the biosensor surface by dissociating bound analytes, improving its reusability.

Area of Science:

  • Biosensor technology
  • Electrochemistry
  • Biomolecular interactions

Background:

  • Biosensors require efficient regeneration for repeated use.
  • Controlling biomolecular binding and dissociation is crucial for biosensor performance.
  • Existing biosensors often struggle with slow analyte release and poor surface regeneration.

Purpose of the Study:

  • To develop a novel biosensor platform combining fluorescence detection with electrochemical control.
  • To investigate the use of electrochemical polarization for controlling antibody-antigen and streptavidin-biotin interactions.
  • To assess the ability of electrochemical control to regenerate a biosensor surface.

Main Methods:

  • A biosensor platform was constructed using biotinylated indium-tin oxide (ITO) electrodes integrated with total internal reflection fluorescence (TIRF) flow cells.

Related Experiment Videos

  • TIRF microscopy was employed for real-time monitoring of biospecific binding events.
  • Electrochemical polarization, including square wave and sawtooth functions, was applied to control analyte dissociation.

    • Main Results:

    • Simultaneous fluorescence detection and electrochemical control of biospecific binding were achieved.
    • Electrochemical polarization effectively stimulated the dissociation of kinetically irreversible biotin-streptavidin and antibody-antigen complexes.
    • Square wave polarization demonstrated superior dissociation efficiency compared to sawtooth polarization, enabling effective biosensor surface regeneration.
    • Electrochemical polarization influenced protein adsorption, suggesting potential for enhancing specific interactions and reducing non-specific binding.

    Conclusions:

    • The developed biosensor platform offers simultaneous detection and electrochemical control, overcoming limitations of slow analyte release.
    • Electrochemical polarization is a viable method for regenerating biosensor surfaces by dissociating strongly bound biomolecules.
    • This approach enhances biosensor reusability and offers potential for optimizing biomolecular interactions and minimizing non-specific adsorption.