Electrochemical DNA Sensing Technologies

Electrochemical DNA sensing exploits the interaction between nucleic acid sequences and electrodes to transduce hybridisation events into measurable electrical signals. In a typical format, single-stranded DNA probes are immobilised on conductive substrates, where complementary target strands bind selectively. Signal readout is achieved through voltammetric or impedimetric measurements, often employing redox indicators or label-free strategies. Recent advances in electrode materials, including carbon nanostructures, metal nanoparticles and two-dimensional semiconductors, have greatly enhanced sensitivity and decreased response times. Integration with miniaturised screen-printed electrodes and microfluidic platforms has enabled portable, low-cost devices suitable for point-of-care diagnostics, environmental monitoring and food safety assessment. Parallel developments in surface chemistry and probe design have improved selectivity, reduced non-specific adsorption and allowed multiplexed detection. Taken together, these innovations position electrochemical DNA sensors as versatile tools for rapid, accurate genetic analysis in both laboratory and field settings.

Research from Nature Portfolio

A pioneering investigation demonstrated the use of two-dimensional molybdenum disulphide nanosheets to fabricate a disposable electrochemical biosensor for the detection of viral DNA. The nanosheets were synthesised via a chemical route and physically adsorbed onto gold screen-printed electrodes, providing a biocompatible interface for single-stranded DNA probes. Hybridisation with target DNA was monitored by differential voltammetry through the interaction of methylene blue with guanine bases, producing a concentration-dependent signal over a broad dynamic range. This work established the viability of layered transition-metal dichalcogenides as robust transducer materials and underscored the potential of point-of-care genosensors for rapid pathogen detection in resource-limited settings.

Electrochemical DNA Sensing Technologies publication trend

The graph below shows the total number of articles in electrochemical dna sensing technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Electrochemical impedance spectroscopy: A technique that measures the resistance and capacitance of an electrode interface to assess changes upon biomolecular binding.

Cyclic voltammetry: A method in which the potential of an electrode is swept cyclically to characterise redox processes and detect analytes.

Screen-printed electrode: A low-cost, disposable electrode manufactured by layering conductive inks onto substrates for electrochemical sensing.

Reduced graphene oxide: A chemically or electrochemically treated form of graphene oxide with restored conductivity, used to enhance electron transfer.

Differential pulse voltammetry: A voltammetric technique applying a series of potential pulses to improve sensitivity in trace analysis.

Molybdenum disulphide nanosheets: Two-dimensional semiconductor materials with a high surface area and biocompatibility, employed as electrode modifiers.

References

1. Label-Free DNA Biosensor Based on Reduced Graphene Oxide and Gold Nanoparticles. Biosensors (2023).
2. Development of a New Route for the Immobilization of Unmodified Single-Stranded DNA on Chitosan Beads and Detection of Released Guanine after Hydrolysis. Molecules (2023).
3. Detection of chikungunya virus DNA using two-dimensional MoS2 nanosheets based disposable biosensor. Scientific Reports (2018).