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Updated: May 23, 2026
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A Polyaniline-based Sensor of Nucleic Acids
Published on: November 1, 2016
A highly sensitive, label-free gene sensor based on a single conducting polymer nanowire
Bhuvaneswari Kannan1, David E Williams1, Cosmin Laslau1
1Polymer Electronics Research Centre, School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand; MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand.
Biosensors & Bioelectronics
|April 6, 2012
Summary
This study presents a novel nanowire sensor for highly sensitive and selective detection of cancer-specific DNA sequences. The developed sensor achieves femtomolar detection limits for breast and ovarian cancer biomarkers.
Area of Science:
- Nanotechnology
- Biomedical Engineering
- Molecular Diagnostics
Background:
- Semiconductor nanowires offer potential for ultrasensitive biosensing.
- Direct electrical detection of biological and chemical species is crucial for advanced sensing devices.
Purpose of the Study:
- To develop a highly sensitive and selective nanowire-based sensor for detecting cancer-specific DNA.
- To demonstrate the sensor's capability for direct electrical detection of target oligonucleotides.
Main Methods:
- Constructed a transducer using a copolymer of poly(3,4-ethylenedioxythiophene) (PEDOT) functionalized nanowires.
- Covalently attached amino-modified probe oligonucleotides to the nanowire surface.
- Performed ex situ (two-terminal) and in situ (scanning ion conductance microscopy) electrical measurements.
Main Results:
- Detected target oligonucleotides specific to breast and ovarian cancer cells at femtomolar concentrations.
- Successfully discriminated target DNA from non-complementary sequences.
- Observed a highly sensitive, concentration-dependent change in resistance upon target binding.
Conclusions:
- The developed PEDOT-functionalized nanowire sensor enables ultrasensitive and selective electrical detection of cancer-related DNA.
- This technology holds promise for early cancer diagnosis and molecular monitoring.
