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Updated: Jul 11, 2026

A Polyaniline-based Sensor of Nucleic Acids
07:58

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Ultrasensitive DNA hybridization biosensor based on polyaniline.

Kavita Arora1, Nirmal Prabhakar, Subhash Chand

  • 1Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr KS Krishnan Marg, New Delhi, India.

Biosensors & Bioelectronics
|September 15, 2007
PubMed
Summary

A novel DNA biosensor uses polyaniline (PANI) for ultrasensitive detection. Methylene blue (MB) as a redox indicator enhances detection limits by 100 times compared to direct guanine oxidation.

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Nanomaterials

Background:

  • DNA hybridization detection is crucial for diagnostics.
  • Developing ultrasensitive and rapid biosensors remains a challenge.
  • Polyaniline (PANI) offers promising electrochemical properties for biosensor development.

Purpose of the Study:

  • To fabricate an ultrasensitive DNA hybridization biosensor.
  • To immobilize DNA probes onto a polyaniline-modified electrode.
  • To evaluate detection methods using methylene blue (MB) and direct guanine oxidation.

Main Methods:

  • Electrochemical deposition of polyaniline (PANI) onto a platinum disc electrode.
  • Biotin-avidin system for immobilizing single-stranded DNA probes (BdC and BdE).

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  • Detection via direct electrochemical oxidation of guanine and redox indicator MB.
  • Characterization using differential pulse voltammetry (DPV), FT-IR, impedance, and SEM.

    • Main Results:

    • Successful fabrication of DNA-immobilized PANI electrodes.
    • MB-based detection showed a 100-fold enhancement in detection limit compared to guanine oxidation.
    • Ultrasensitive DNA hybridization detection with a response time of approximately 60 seconds.

    Conclusions:

    • The PANI-based DNA biosensor demonstrates high sensitivity and rapid detection.
    • Methylene blue (MB) significantly improves the detection limit for DNA hybridization.
    • This biosensor shows potential for sensitive and efficient DNA detection applications.