Electrochemical Detection of Pseudomonas Aeruginosa Virulence Factors

Electrochemical techniques have emerged as powerful tools for the rapid and sensitive detection of virulence factors secreted by Pseudomonas aeruginosa, an opportunistic Gram-negative pathogen. Central among these factors is pyocyanin, a redox-active phenazine that modulates host immune responses, promotes biofilm formation and contributes to antibiotic resistance. By exploiting the intrinsic electroactivity of pyocyanin and related molecules, researchers have developed a diverse array of sensor platforms—ranging from microfabricated electrode arrays to molecularly imprinted polymers and laser-induced graphene composites—that enable real-time monitoring of phenazine production in clinical specimens, environmental samples and biofilm cultures. These approaches offer advantages in terms of specificity, sensitivity and miniaturisation, facilitating near-patient diagnostics and dynamic assessment of antibiotic susceptibility. Recent innovations have extended detection capabilities to multiple virulence factors simultaneously, provided spatial mapping of metabolic activity across biofilms and demonstrated compatibility with wearable and point-of-care devices. Collectively, electrochemical sensing of P. aeruginosa virulence factors holds promise for improving infection management, guiding antibiotic therapy and deepening our understanding of microbial physiology under diverse stress conditions.

Research from Nature Portfolio

In one seminal study, an integrated electrochemical camera chip with over 1,800 microelectrodes enabled spatially resolved imaging of redox-active phenazines across P. aeruginosa biofilms. This platform revealed distinct localisation patterns for pyocyanin, phenazine-1-carboxylic acid and methylated derivatives under aerobic and anaerobic conditions, offering new insights into metabolic zonation within bacterial communities. Another foundational work employed a boron-doped diamond electrode to achieve simultaneous nanomolar detection of pyocyanin and key quorum sensing molecules, including HHQ and PQS, in complex biological fluids. By optimising differential pulse voltammetry parameters, this approach delivered a molecular signature unique to P. aeruginosa, with potential for early clinical diagnosis and treatment monitoring.

Electrochemical Detection of Pseudomonas Aeruginosa Virulence Factors publication trend

The graph below shows the total number of articles in electrochemical detection of pseudomonas aeruginosa virulence factors across all publications each year (not limited to Nature Index journals).

Technical terms

Pyocyanin: A redox-active phenazine virulence factor produced by P. aeruginosa, detectable electrochemically by its reversible redox peaks.

Biofilm: A structured community of bacteria encased in extracellular polymeric substances that confers protection and antibiotic tolerance.

Laser-induced graphene (LIG): Porous graphene formed by laser texturing of polymer substrates, used as a high-surface-area electrode material.

Molecularly imprinted polymer (MIP): Synthetic polymer with selective binding sites templated to a target molecule, enhancing sensor specificity.

Differential pulse voltammetry (DPV): A sensitive electroanalytical technique that applies potential pulses to resolve overlapping redox signals.

Boron-doped diamond electrode (BDD): A conductive diamond electrode with a wide potential window and low background current for trace detection.

References

1. Direct Laser-Functionalized Au-LIG Sensors for Real-time Electrochemical Monitoring of Response of Pseudomonas aeruginosa Biofilms to Antibiotics. ECS Sensors Plus (2023).
2. Detection of Pseudomonas aeruginosa infection using a sustainable and selective polydopamine-based molecularly imprinted electrochemical sensor. European Polymer Journal (2024).
3. Electrochemical camera chip for simultaneous imaging of multiple metabolites in biofilms. Nature Communications (2016).
4. Electrochemically monitoring the antibiotic susceptibility of Pseudomonas aeruginosa biofilms. Analyst (2015).
5. Molecular Signature of Pseudomonas aeruginosa with Simultaneous Nanomolar Detection of Quorum Sensing Signaling Molecules at a Boron-Doped Diamond Electrode. Scientific Reports (2016).
6. Paper-based sensors for rapid detection of virulence factor produced by Pseudomonas aeruginosa. PLOS ONE (2018).