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Related Experiment Video

Updated: Oct 16, 2025

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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Integrated Microfluidic Device With Carbon-Thread Microelectrodes for Electrochemical DNA Elemental Analysis.

Mary Salve, Khairunnisa Amreen, Prasant Kumar Pattnaik

    IEEE Transactions on Nanobioscience
    |October 21, 2021
    PubMed
    Summary

    This study presents a new microfluidic electrochemical device for simultaneously detecting DNA bases (adenine, guanine, cytosine, thymine). The developed device offers a simple, sensitive method for DNA base analysis, suitable for point-of-care testing.

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    Area of Science:

    • Electrochemistry
    • Biotechnology
    • Analytical Chemistry

    Background:

    • Alterations in DNA base concentrations (adenine, guanine, cytosine, thymine) are linked to physiological disorders.
    • Simultaneous determination of DNA bases presents a significant analytical challenge.
    • Microfluidic devices offer advantages for rapid, sensitive, and low-volume analysis, ideal for point-of-care testing (POCT).

    Purpose of the Study:

    • To develop a simple and precise microfluidic electrochemical device for simultaneous DNA base detection.
    • To utilize carbon-thread microelectrodes (CTMEs) for sensitive and accurate DNA elemental analysis.
    • To validate the device's performance for analyzing DNA bases in biological samples.

    Main Methods:

    • Fabrication of a three-electrode microfluidic device using functionalized carbon-thread microelectrodes (CTMEs).
    • The working electrode was modified with graphitic mesoporous carbon (GMC).
    • Electrochemical techniques were employed for simultaneous evaluation of individual DNA bases.

    Main Results:

    • The developed device achieved distinct anodic peak currents for guanine (G), adenine (A), thymine (T), and cytosine (C) at specific potentials.
    • Simultaneous sensing capabilities were confirmed with low detection limits for each DNA base.
    • The device successfully performed instantaneous determination of DNA bases in human blood serum samples.

    Conclusions:

    • A novel microfluidic electrochemical device utilizing CTMEs has been successfully developed.
    • The device enables simple, sensitive, and simultaneous electrochemical determination of DNA bases.
    • This technology is amenable for point-of-care testing applications, including analysis in human blood serum.