Electrochemical Sensing Techniques for Biomolecule and Analyte Detection

Electrochemical sensing has emerged as a pivotal approach for the rapid, sensitive and cost-effective detection of a wide range of biomolecules and analytes. By transducing the chemical or biochemical recognition event into an electrical signal, such sensors combine high analytical performance with ease of miniaturisation. Key transduction modes include amperometry, voltammetry and impedance measurement, each offering distinct advantages in terms of sensitivity, selectivity and temporal resolution. Advances in electrode materials—from carbon allotropes and metal nanoparticles to conductive polymers and metal–organic frameworks—have driven improvements in electron transfer kinetics and surface area, enabling lower limits of detection and broader linear ranges. Functionalisation strategies such as enzyme immobilisation, aptamer integration and molecular imprinting augment selectivity towards specific targets, while integration with microfluidics and wearable platforms expands in situ and point-of-care applications. Real-time monitoring of neurotransmitters, metabolic markers and environmental pollutants illustrates the global significance of these technologies, from clinical diagnostics to environmental surveillance. The convergence of nanotechnology, surface chemistry and signal processing continues to refine sensor architectures, paving the way toward multiplexed, wireless and even implantable devices. As the field moves towards practical deployment, challenges such as interference from complex matrices, long-term stability and standardised fabrication must be addressed to ensure robust performance in real-world settings.

Research from Nature Portfolio

Recent studies have demonstrated the utility of periodically structured gold nanoelectrode arrays for neurotransmitter sensing. A laser-lithography and electrodeposition approach produced uniform cylindrical gold electrodes with sub-micrometre dimensions, yielding a linear detection range for dopamine from one to one hundred micromolar and a limit of detection in the low micromolar regime. The homogeneous array supported adhesion and viability of neural cells, enabling simultaneous cell culture and electrochemical monitoring of secreted neurotransmitters. This platform exemplifies how precise nanofabrication and electrode design can marry biological compatibility with analytical performance, pointing towards implantable or in vitro test-bed applications for neurological research and diagnostics.

Electrochemical Sensing Techniques for Biomolecule and Analyte Detection publication trend

The graph below shows the total number of articles in electrochemical sensing techniques for biomolecule and analyte detection across all publications each year (not limited to Nature Index journals).

Technical terms

Cyclic voltammetry: A technique in which the potential of an electrode is swept linearly back and forth and the resulting current is measured, revealing redox behaviour of analytes.

Amperometry: A measurement of current at a fixed potential over time, often used for continuous monitoring of electroactive species.

Electrode functionalisation: The modification of an electrode surface with catalysts, recognition elements or nanomaterials to enhance selectivity and sensitivity.

Molecular imprinting: A method of creating polymer matrices with target-shaped cavities that selectively rebind a specific analyte.

Limit of detection (LOD): The lowest concentration of analyte that can be reliably distinguished from a blank signal under defined conditions.

References

1. Electrochemical biosensors: perspective on functional nanomaterials for on-site analysis. Biomaterials Research (2020).
2. Electrochemical detection of dopamine using periodic cylindrical gold nanoelectrode arrays. Scientific Reports (2018).
3. Simultaneous and sensitive determination of ascorbic acid, dopamine and uric acid via an electrochemical sensor based on PVP-graphene composite. Journal of Nanobiotechnology (2020).