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Sequence-selective biosensor for DNA based on electroactive hybridization indicators

K M Millan1, S R Mikkelsen

  • 1Department of Chemistry and Biochemistry, Concordia University, Montreal, Canada.

Analytical Chemistry
|September 1, 1993
PubMed
Summary
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Researchers developed a novel DNA sensor by immobilizing deoxyribonucleic acid (DNA) onto electrodes. This biosensor uses electroactive cobalt complexes to detect DNA hybridization, enabling sequence-specific detection and reusable sensing capabilities.

Area of Science:

  • Electrochemistry
  • Biosensors
  • Nucleic Acid Chemistry

Background:

  • Covalent immobilization of deoxyribonucleic acid (DNA) onto electrode surfaces is crucial for developing electrochemical biosensors.
  • Oxidized glassy carbon electrodes activated with carbodiimide chemistry enable selective DNA immobilization via deoxyguanosine (dG) residues.

Purpose of the Study:

  • To develop a voltammetric method for detecting immobilized DNA using electroactive cobalt complexes.
  • To construct and evaluate a prototype sequence-selective DNA biosensor utilizing hybridization indicators.

Main Methods:

  • Covalent immobilization of DNA onto activated glassy carbon electrodes.
  • Voltammetric detection using tris(bipyridyl)cobalt(III) and tris(phenanthroline)cobalt(III) complexes as electroactive indicators.

Related Experiment Videos

  • Enzymatic elongation and hybridization assays for sequence-specific DNA detection.

    • Main Results:

    • Nonlinear dependence of voltammetric peak currents on cobalt complex concentration indicated saturation binding with immobilized DNA.
    • Estimation of local DNA concentration and DNA-cobalt complex association constants were determined.
    • Hybridization events on the oligo(dT)20(dG)98 modified electrode resulted in increased cathodic peaks, demonstrating sequence-specific detection.

    Conclusions:

    • Electroactive hybridization indicators can be effectively used in reusable, sequence-selective DNA biosensors.
    • The developed method allows for the detection of DNA hybridization with high specificity.
    • The biosensor platform demonstrates potential for sensitive and selective nucleic acid analysis.