Electrochemical Biosensors for Viral DNA Detection

Electrochemical biosensors for viral DNA detection exploit the specificity of nucleic acid hybridisation combined with sensitive electrical readouts to identify pathogen-derived genetic sequences at ultra-low concentrations. Typically, a single-stranded DNA probe complementary to a target viral sequence is immobilised onto a conductive transducer, often a screen-printed or interdigitated electrode. Upon hybridisation with the target DNA, changes in surface charge, impedance or voltammetric currents are registered by techniques such as differential pulse voltammetry or electrochemical impedance spectroscopy. Advances in nanomaterials—including graphene derivatives, metal-oxide nanorods and composite architectures—have enhanced electron transfer, increased probe loading and amplified signals, enabling limits of detection in the femtomolar to attomolar range. The modular design of these platforms allows integration into portable or point-of-care devices, offering rapid, low-cost alternatives to conventional molecular assays. Beyond human papillomavirus, similar strategies have been adapted for hepatitis, Epstein–Barr virus and emerging pathogens, underscoring the global significance of electrochemical genosensors for early diagnosis, epidemiological surveillance and outbreak response.

Research from Nature Portfolio

One foundational study described a nanohybrid platform in which gold-doped zinc oxide nanorods were interfaced with interdigitated electrodes to detect the HPV-16 E6 oncogene. By coating zinc oxide nanorods with gold and immobilising complementary DNA receptors, the system achieved exceptional sensitivity via electrochemical impedance spectroscopy, detecting as low as 1 fM of target DNA and maintaining stable performance over five weeks. The enhanced surface roughness and biocompatibility of the nanorod film fostered rapid electron transfer and high selectivity against non-complementary sequences, illustrating a viable route to robust point-of-care diagnostics in resource-limited settings.

Electrochemical Biosensors for Viral DNA Detection publication trend

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

Technical terms

Electrochemical impedance spectroscopy (EIS): A technique measuring the frequency-dependent response of a sensor to an applied AC potential, used to assess changes in interfacial charge transfer upon DNA hybridisation.
Differential pulse voltammetry (DPV): A voltammetric method that applies a sequence of potential pulses to generate current peaks corresponding to redox events, enabling quantification of bound or intercalated reporter molecules.
Redox indicator: A molecule that undergoes reversible oxidation and reduction, providing a measurable current change when intercalated into double-stranded DNA.
Nanohybrid: A composite material combining two or more nanostructures (e.g., metal nanoparticles and two-dimensional sheets) to synergistically enhance electronic conductivity and surface area.
Probe DNA: A synthetic single-stranded oligonucleotide immobilised on the sensor surface to selectively bind its complementary viral target sequence.

References

1. A graphitic nano-onion/molybdenum disulfide nanosheet composite as a platform for HPV-associated cancer-detecting DNA biosensors. Journal of Nanobiotechnology (2023).
2. Gold-Hybridized Zinc Oxide Nanorods as Real-Time Low-Cost NanoBiosensors for Detection of virulent DNA signature of HPV-16 in Cervical Carcinoma. Scientific Reports (2019).
3. A Multianalyte Electrochemical Genosensor for the Detection of High-Risk HPV Genotypes in Oral and Cervical Cancers. Biosensors (2022).
4. APTES-Modified Remote Self-Assembled DNA-Based Electrochemical Biosensor for Human Papillomavirus DNA Detection. Biosensors (2022).