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Related Experiment Video

Updated: May 13, 2026

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen
17:16

Development of an Electrochemical DNA Biosensor to Detect a Foodborne Pathogen

Published on: June 3, 2018

Chitosan-Modified Graphene Electrodes for DNA Mutation Analysis.

Subbiah Alwarappan1, Kyle Cissell, Suraj Dixit

  • 1USF Nanomedicine Research Center and Division of Translational Medicine, Department of Internal Medicine, USF Morsani College of Medicine, University of South Florida, Tampa, FL 33612 ; Nanomaterials Research and Education Center, University of South Florida, Tampa, FL 33620-5350.

Journal of Electroanalytical Chemistry (Lausanne, Switzerland)
|March 9, 2013
PubMed
Summary
This summary is machine-generated.

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Researchers developed a novel chitosan-graphene biosensor for detecting DNA sequence changes. This electrochemical platform shows high sensitivity for identifying mismatched DNA, paving the way for point-of-care diagnostic tests.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Biotechnology

Background:

  • Graphene exhibits excellent electrochemical properties suitable for biosensor development.
  • Exploration of graphene for DNA biosensing remains limited.
  • Chitosan is a biocompatible polymer with potential for biomolecule immobilization.

Purpose of the Study:

  • To develop and characterize a chitosan-modified graphene platform for electrochemical DNA biosensing.
  • To evaluate the platform's ability to detect sequence variations in DNA.
  • To assess the potential of this biosensor for disease diagnostics.

Main Methods:

  • Chemical synthesis and characterization of graphene (Raman spectroscopy, TEM).
  • Covalent modification of graphene with chitosan.

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Last Updated: May 13, 2026

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Published on: June 3, 2018

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

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  • Immobilization of single-stranded DNA (ssDNA) capture probes.
  • Electrochemical detection using cyclic voltammetry to differentiate complementary and mismatched DNA targets.

    • Main Results:

    • Chitosan successfully immobilized onto graphene.
    • The chitosan-graphene electrode demonstrated stable immobilization of ssDNA.
    • Significantly higher redox peak currents were observed for complementary DNA compared to mismatched DNA.
    • The platform showed sensitive detection of DNA sequence variations.

    Conclusions:

    • The chitosan-graphene platform is effective for sensitive and stable electrochemical detection of mismatched DNA.
    • This biosensor holds promise for rapid, point-of-care diagnostic applications for specific DNA mutations.
    • Further development could lead to advanced diagnostic tools for various genetic conditions.