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A mediatorless biosensor for putrescine using multiwalled carbon nanotubes.

J-F Rochette1, E Sacher, M Meunier

  • 1Ecole Polytechnique de Montréal, Department of Engineering Physics, Montreal, Que., Canada H3C 3A7.

Analytical Biochemistry
|December 29, 2004
PubMed
Summary

A novel mediatorless putrescine biosensor was developed using multiwalled carbon nanotubes (MWCNTs) and putrescine oxidase. This biosensor enables rapid and sensitive detection of putrescine in biological samples without interference.

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Area of Science:

  • Electrochemistry
  • Biosensor Development
  • Nanomaterials

Background:

  • Polyelectrolytes like Poly(diallyldimethylammonium) chloride are effective in dispersing multiwalled carbon nanotubes (MWCNTs).
  • MWCNTs can modify electrode surfaces for enhanced electrochemical applications.
  • Putrescine oxidase is an enzyme crucial for detecting putrescine.

Purpose of the Study:

  • To develop a mediatorless biosensor for putrescine detection.
  • To utilize MWCNT-modified electrodes for improved enzyme immobilization and electron transfer.
  • To achieve sensitive and selective putrescine detection, avoiding common interferences.

Main Methods:

  • Modification of a glassy carbon electrode with MWCNTs and Poly(diallyldimethylammonium) chloride.

Related Experiment Videos

  • Immobilization of putrescine oxidase onto the modified electrode surface.
  • Electrochemical characterization and performance evaluation of the developed biosensor.

    • Main Results:

    • The MWCNT network on the electrode surface facilitated direct electron transfer between the enzyme and the electrode.
    • The biosensor demonstrated efficient monitoring of putrescine oxidase's direct electroactivity.
    • A low detection limit (5 microM) and high selectivity for putrescine were achieved, with a 20-fold greater response compared to interfering species.
    • The biosensor successfully detected putrescine in cancerous mouse plasma without prior purification, showing rapid analysis capability.

    Conclusions:

    • The developed MWCNT-based mediatorless biosensor offers a promising platform for sensitive and selective putrescine detection.
    • Direct electron transfer mechanism circumvents interference from common biological compounds like ascorbic and uric acids.
    • The biosensor's efficiency in analyzing complex biological matrices like plasma highlights its potential for clinical applications.