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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
Published on: September 10, 2014
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Graphene Oxide-Functionalized Thread-Based Electrofluidic Approach for DNA Hybridization
Liang Wu1, Arushi Manchanda1, Vipul Gupta1
1Australian Centre for Research on Separation Science (ACROSS) and ARC Centre of Excellence for Electromaterials Science (ACES), School of Natural Sciences (Chemistry), University of Tasmania, Hobart 7001, Tasmania, Australia.
ACS Omega
|April 24, 2023
Summary
A new thread-based method uses graphene oxide to detect DNA hybridization. This low-cost, disposable device offers a visual signal for potential point-of-care diagnostics.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Materials Science
Background:
- Isotachophoresis (ITP) is an electrokinetic separation technique.
- Graphene oxide (GO) offers unique surface properties for biomolecule interactions.
- Thread-based analytical devices provide a low-cost, disposable platform.
Purpose of the Study:
- To develop a novel, low-cost, disposable thread-based electrofluidic analytical method.
- To demonstrate surface DNA hybridization using isotachophoresis and graphene oxide functionalization.
- To enable visualization of DNA hybridization for potential diagnostic applications.
Main Methods:
- Utilized nylon threads functionalized with graphene oxide (GO) as a binding platform.
- Employed isotachophoresis (ITP) to focus fluorescently labeled single-stranded DNA (ssDNA) onto GO zones, causing fluorescence quenching.
- Detected complementary DNA (cDNA) by observing the restoration of fluorescence upon hybridization and release from GO zones.
Main Results:
- Successfully trapped ssDNA on GO-functionalized threads, indicated by fluorescence quenching.
- Demonstrated surface DNA hybridization upon introduction of complementary DNA (cDNA).
- Observed restoration of fluorescence signal upon hybridization, indicating dsDNA release from GO zones.
Conclusions:
- The GO-functionalized thread-based microfluidic approach enables controllable DNA hybridization detection and visualization.
- This method offers a low-cost, disposable platform with potential for adaptation into point-of-care (POC) diagnostic devices.
- The developed technique shows promise for real-world diagnostic applications requiring sensitive DNA detection.
