Electrochemical Techniques for Nucleic Acid Analysis

Electrochemical approaches to nucleic acid analysis integrate the specificity of molecular recognition with the sensitivity and portability of electroanalytical methods. Central to this field are electrode platforms modified with conductive nanomaterials—such as gold nanoparticles, carbon nanotubes and conducting polymers—that enhance electron transfer and surface area for immobilising DNA or RNA probes. Detection modalities typically include cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy, which measure changes in current or impedance arising from hybridisation events or conformational alterations of nucleic acids. Label-free strategies exploit the intrinsic electroactivity of nucleobases—particularly guanine and adenine—whereas label-based assays employ redox indicators or tethered metal complexes to amplify signal. Advances in aptamer-based sensors have enabled selective recognition of small molecules, proteins and even whole cells through folding-induced electrochemical signatures. Emerging platforms using G-quadruplex architectures and nano-engineered films offer enhanced electron-transfer kinetics and real-time monitoring capabilities. These techniques have found applications in point-of-care diagnostics, environmental monitoring of microbial pathogens and genotoxicity assessment, benefitting from rapid analysis times, low sample volumes and compatibility with miniaturised devices. Integration with microfluidic systems and multiplexed arrays promises high-throughput screening and decentralised testing in resource-limited settings, underscoring the global significance of electrochemical nucleic acid sensors in advancing personalised medicine and public health surveillance.

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Electrochemical Techniques for Nucleic Acid Analysis publication trend

The graph below shows the total number of articles in electrochemical techniques for nucleic acid analysis across all publications each year (not limited to Nature Index journals).

Technical terms

Cyclic voltammetry: Technique that applies a linearly varying potential to an electrode and measures resulting current to probe redox processes.

Differential pulse voltammetry: Sensitive method applying potential pulses superimposed on a linear sweep to detect low-concentration analytes.

Electrochemical impedance spectroscopy: Measurement of impedance over a range of frequencies to characterise interfacial properties and hybridisation events.

Aptamer: Short nucleic acid sequence selected for high-affinity binding to a specific target, used as a recognition element in sensors.

G-quadruplex: Four-stranded DNA structure formed by guanine-rich sequences, employed in biosensors for its unique electrochemical signature.

Redox probe: Electroactive molecule, such as methylene blue, used to generate measurable signals upon interaction with nucleic acids.

References

1. May DNA analyses be biased by hidden oxidative damage? Voltammetric study of temperature and oxidation stress effect. PLOS ONE (2024).
2. Long-range electron transfer mediated by G-quadruplex wires attached to gold electrodes via phosphorothioated dA tags. Electrochimica Acta (2024).