Electrochemical Biosensing Techniques for Nucleic Acid Detection
Summary
Electrochemical biosensing for nucleic acid detection harnesses the specificity of DNA or RNA hybridisation with the sensitivity of electrochemical transduction, offering rapid, portable and cost-effective diagnostic tools. In these systems, single-stranded probe sequences are immobilised on conductive electrodes modified with nanomaterials—such as graphene derivatives, gold nanoparticles or conducting polymers—to facilitate efficient electron transfer. Upon target binding, changes in current, potential or impedance are recorded by techniques including cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy. Advances in nanocomposite design and surface chemistry have driven detection limits into the picomolar and femtomolar ranges, while response times have fallen to a few seconds. The integration of signal amplification strategies and multiplexed arrays enables simultaneous detection of multiple genetic markers, with profound implications for early disease diagnosis, monitoring of antimicrobial resistance, food-safety screening and environmental surveillance. By combining robust fabrication methods with straightforward read-out formats, these biosensing platforms are poised to transform point-of-care nucleic acid testing on a global scale.
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Electrochemical Biosensing Techniques for Nucleic Acid Detection publication trend
The graph below shows the total number of articles in electrochemical biosensing techniques for nucleic acid detection across all publications each year (not limited to Nature Index journals).
Technical terms
Electrochemical biosensor: A device combining a biological recognition element with an electrochemical transducer to convert a biochemical interaction into an electrical signal.
Genosensor: A biosensor specifically designed to detect nucleic acid sequences via complementary probe-target hybridisation.
Cyclic voltammetry (CV): An electrochemical technique that measures current response while the electrode potential is swept cyclically to characterise redox processes.
Electrochemical impedance spectroscopy (EIS): A method that applies a small alternating potential to the electrode and measures impedance over a range of frequencies to probe interfacial properties.
Nanocomposite: A material combining nanoscale components—such as nanoparticles or nanotubes—with a matrix to exploit enhanced electrical, mechanical or catalytic properties.
Probe DNA: A single-stranded oligonucleotide immobilised on the sensor surface to capture complementary target nucleic acid via hybridisation.
References
- Reduced Graphene Oxide-Polydopamine-Gold Nanoparticles: A Ternary Nanocomposite-Based Electrochemical Genosensor for Rapid and Early Mycobacterium tuberculosis Detection. Biosensors (2023).
- An Electrochemical DNA Biosensor Developed on a Nanocomposite Platform of Gold and Poly(propyleneimine) Dendrimer. Sensors (2008).
- Nanomaterial-Assisted Signal Enhancement of Hybridization for DNA Biosensors: A Review. Sensors (2009).
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