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Inhibited enzyme electrodes. Part 1: Theoretical model.

W J Albery1, A E Cass, Z X Shu

  • 1Department of Chemistry, Imperial College, London, UK.

Biosensors & Bioelectronics
|January 1, 1990
PubMed
Summary
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This study presents a theoretical model for electrochemical sensors that detect toxic substances by measuring enzyme inhibition. The model provides analytical solutions for various rate-limiting processes, aiding sensor design.

Area of Science:

  • Electrochemistry
  • Biochemical Sensing
  • Theoretical Modeling

Background:

  • Electrochemical sensors are crucial for detecting toxic substances.
  • Enzyme inhibition is a key mechanism in many biosensors.
  • Understanding enzyme kinetics and substrate diffusion is vital for sensor performance.

Purpose of the Study:

  • To develop a theoretical model for an electrochemical sensor based on enzyme activity inhibition.
  • To provide analytical solutions for substrate concentration profiles under various kinetic conditions.
  • To discuss the application of this model, particularly with cytochrome oxidase.

Main Methods:

  • Developing a theoretical model for enzyme inhibition-based electrochemical sensors.
  • Assuming Michaelis-Menten kinetics for enzyme activity.

Related Experiment Videos

  • Solving the diffusion kinetic equation for substrate concentration in the electrolyte layer.

    • Main Results:

    • A complete set of analytical solutions was derived.
    • Solutions correspond to different rate-limiting processes.
    • A case diagram illustrates the different solution scenarios.

    Conclusions:

    • The theoretical model offers a framework for designing effective electrochemical sensors.
    • The analytical solutions facilitate the understanding of sensor response under various conditions.
    • The model is applicable to enzymes like cytochrome oxidase for toxic substance detection.