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Ethanol biosensors based on alcohol oxidase.

Ana M Azevedo1, D Miguel F Prazeres, Joaquim M S Cabral

  • 1Centro de Engenharia Biológica e Química, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.

Biosensors & Bioelectronics
|July 19, 2005
PubMed
Summary

This review highlights alcohol oxidase (AOX) sensors for sensitive ethanol detection. AOX-based biosensors offer enhanced specificity in complex samples using electrochemical or immobilized enzyme methods.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Biosensors

Background:

  • Accurate ethanol detection is crucial across various fields.
  • Traditional methods like chromatography and spectrophotometry have limitations.
  • Alcohol oxidase (AOX) enzyme offers high specificity for ethanol analysis.

Purpose of the Study:

  • To review the current state of alcohol oxidase (AOX) based sensors for ethanol determination.
  • To explore different sensor designs and detection strategies.
  • To assess the advantages of AOX in complex sample analysis.

Main Methods:

  • Review of AOX-based electrochemical sensors and immobilized enzyme reactors.
  • Analysis of sensors monitoring oxygen consumption or hydrogen peroxide formation.

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  • Discussion of amperometric electrodes, bienzymatic systems (AOX-HRP), and various electrode types (carbon paste, screen-printed, etc.).

    • Main Results:

    • AOX sensors demonstrate high sensitivity, selectivity, and accuracy for ethanol.
    • Electrochemical detection commonly involves monitoring O2 or H2O2 at specific potentials.
    • Immobilized enzyme reactors with AOX offer an alternative for ethanol quantification.

    Conclusions:

    • AOX-based sensors represent a significant advancement in ethanol detection technology.
    • Both electrochemical and immobilized enzyme reactor approaches provide effective solutions.
    • These biosensors are valuable tools for analyzing ethanol in complex matrices.