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Molecular recognition and molecular sensors.

W J Albery1

  • 1Molecular Sensors Unit, University College, Oxford, UK.

Ciba Foundation Symposium
|January 1, 1991
PubMed
Summary

Molecular sensors leverage enzyme-substrate interactions for precise measurements. Researchers developed novel enzyme electrodes for detecting glucose in vivo and other analytes like acetylcholine and H2S with high sensitivity.

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Analytical Chemistry

Background:

  • Enzyme-substrate recognition is a foundation for molecular sensor development.
  • Direct enzyme electrodes transduce reaction rates into measurable currents.
  • Conducting organic salt electrodes facilitate NADH oxidation for sensing applications.

Purpose of the Study:

  • To explore the application of enzyme-based electrodes for various analytical measurements.
  • To demonstrate the sensitivity and versatility of electrochemical sensing platforms.
  • To develop methods for in vivo analyte detection and toxic substance monitoring.

Main Methods:

  • Construction and utilization of direct enzyme electrodes.
  • Employing electrodes for NADH oxidation.
  • Development of packed-bed wall-jet and wall-jet ring-disc electrodes.
  • Application of enzyme inhibition for toxic substance detection.

Main Results:

  • Successful in vivo glucose measurement in rat brains using microelectrodes.
  • Detection of micellar equilibria involving bile acids.
  • High-sensitivity measurement of femtomole levels of acetylcholine via microdialysis.
  • Femtomole level detection in electrochemical immunoassays.
  • Detection of hydrogen sulfide (H2S) at the parts-per-million (p.p.m.) level.

Conclusions:

  • Enzyme-based electrochemical sensors offer powerful and sensitive analytical tools.
  • Advanced electrode designs enhance detection limits for various analytes.
  • These methods are applicable for in vivo monitoring and toxic substance detection.

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