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Updated: Jul 6, 2026

A Polyaniline-based Sensor of Nucleic Acids
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A Polyaniline-based Sensor of Nucleic Acids

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Polyaniline based nucleic acid sensor.

Nirmal Prabhakar1, Kavita Arora, Harpal Singh

  • 1Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. KS Krishnan Marg, New Delhi-110012, India.

The Journal of Physical Chemistry. B
|March 14, 2008
PubMed
Summary
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This study developed novel PNA-PANI/Au electrodes for rapid Mycobacterium tuberculosis detection. These sensors offer superior specificity and sensitivity compared to DNA-based sensors, enabling quick pathogen identification.

Area of Science:

  • Biosensors and Nanomaterials
  • Molecular Diagnostics
  • Pathogen Detection

Background:

  • Rapid and accurate detection of Mycobacterium tuberculosis is crucial for effective tuberculosis control.
  • Existing nucleic acid detection methods can be time-consuming and require complex sample preparation.
  • Development of sensitive and specific biosensors is needed for point-of-care diagnostics.

Purpose of the Study:

  • To develop and evaluate novel NH2-modified DNA and peptide nucleic acid (PNA) probes immobilized on polyaniline (PANI)/gold (Au) electrodes for Mycobacterium tuberculosis detection.
  • To compare the performance of PNA-based and DNA-based PANI/Au electrodes in terms of specificity, sensitivity, and reusability.
  • To assess the feasibility of using these electrodes for rapid hybridization detection of M. tuberculosis nucleic acids.

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Main Methods:

  • Covalent immobilization of 20-base NH2-modified DNA and PNA probes specific to M. tuberculosis onto PANI/Au electrodes.
  • Electrochemical detection of nucleic acid hybridization using Methylene Blue as a redox indicator.
  • Testing hybridization with complementary, one-base mismatch, and noncomplementary targets.
  • Evaluation of electrode specificity, detection limit, and reusability.

Main Results:

  • The PNA-PANI/Au electrode demonstrated significantly improved specificity (1000 times) and a lower detection limit (0.125 x 10(-18) M) compared to the DNA-PANI/Au electrode (2.5 x 10(-18) M).
  • Hybridization detection with M. tuberculosis genomic DNA was achieved within 1 minute.
  • The PNA-PANI/Au electrodes exhibited higher reusability (13-15 uses) than DNA-PANI/Au electrodes (6-7 uses).

Conclusions:

  • PNA-PANI/Au electrodes offer a highly specific and sensitive platform for the rapid electrochemical detection of Mycobacterium tuberculosis.
  • These biosensors provide a promising alternative to conventional methods for pathogen identification.
  • The enhanced performance and reusability of PNA-based electrodes make them suitable for practical diagnostic applications.