An update on polydiacetylene-based solid-supported sensing platforms for environmental and health monitoring.
Clinical Snapshot
PICO Framework
| P — Population | Not applicable in the traditional clinical sense; the review addresses analytical sensing platforms intended for environmental pollutant detection and biomedical/health diagnostics, with potential end-users including patients, environmental monitoring agencies, and point-of-care settings |
| I — Intervention | Solid-supported polydiacetylene (PDA) sensing platforms — conjugated polymer architectures immobilised onto solid substrates (e.g., membranes, nanoparticles, fibres, paper) that transduce chemical or biological interactions via chromogenic or fluorogenic optical signals |
| C — Comparator | Solution-phase PDA assemblies (earlier generation); implicitly compared against other solid-state sensing technologies for environmental and health monitoring |
| O — Outcomes | Sensing performance metrics including sensitivity, selectivity, limit of detection, signal reversibility, mechanical stability, reproducibility, environmental tolerance, and suitability for portable/field-deployable or wearable diagnostic devices |
Bottom Line
This narrative review from BITS Pilani provides a comprehensive overview of solid-supported polydiacetylene (PDA) sensing platforms as emerging tools for environmental pollutant detection and health monitoring. PDAs are conjugated polymers that undergo striking colour changes (blue-to-red) and fluorescence shifts in response to chemical or biological stimuli, making them attractive for low-cost optical sensing. Immobilising PDAs onto solid supports — membranes, nanoparticles, fibres, or paper — addresses the fragility and irreproducibility of earlier solution-phase systems, improving stability and enabling portable device formats. The review synthesises fabrication strategies, structure-property relationships, and application domains including pathogen detection, heavy metal sensing, and biomarker identification. However, clinicians should note that this is a non-systematic narrative review with no formal quality assessment of primary studies, no clinical validation data from patient cohorts, and no diagnostic accuracy metrics. All reviewed evidence derives from controlled laboratory proof-of-concept studies. Significant challenges remain: signal irreversibility, environmental matrix interference, and the absence of regulatory-grade clinical validation. For Australian practice, TGA IVD registration and RACGP point-of-care framework compliance would be prerequisites for clinical deployment. This technology warrants monitoring by laboratory medicine and point-of-care diagnostics specialists, but is not yet ready for clinical translation.
Key Findings
P Value: Not reported — review design does not generate primary statistical data
Effect Size: Not applicable — no pooled effect size calculated; individual primary study performance metrics (limits of detection, colorimetric response ratios) are reviewed narratively without quantitative synthesis
Primary Outcome: Narrative synthesis of solid-supported PDA sensing platform performance for environmental pollutant detection and biomedical diagnostics, demonstrating enhanced mechanical stability, reproducibility, and field-deployability compared to solution-phase PDA systems
Nnt Or Sensitivity: Diagnostic sensitivity and specificity for clinical applications not formally reported; analytical limits of detection for specific analytes (environmental pollutants, pathogens, biomarkers) are discussed qualitatively from primary studies but not pooled
Confidence Interval: Not reported — no statistical synthesis performed
Clinical Application
Technology remains predominantly at proof-of-concept and early prototype stages. Transition to clinical-grade diagnostic devices requires regulatory approval, clinical validation studies, quality management system compliance, and demonstration of performance in complex biological matrices (blood, urine, saliva). Wearable and field-deployable formats show promise but face significant engineering and regulatory hurdles before clinical deployment. In Australia, any diagnostic device incorporating PDA-based sensing would require TGA registration as an In Vitro Diagnostic (IVD) medical device under the Therapeutic Goods Act 1989, with performance validation against Australian reference standards. The RACGP and ACSQHC point-of-care testing framework would govern clinical deployment in primary care settings. Environmental monitoring applications would need to align with NEPM (National Environment Protection Measure) standards and state EPA requirements. PBS listing is not applicable at this stage. Australian research funding bodies (NHMRC, ARC) may support translational development. No current TGA-registered PDA-based diagnostic devices are identified in the public domain. Potentially applicable to point-of-care diagnostic settings for infectious disease detection, biomarker monitoring, and environmental health surveillance. Most relevant to laboratory medicine, environmental health, infectious disease, and public health contexts. Clinical end-users include pathology services, environmental monitoring agencies, and potentially community health workers using portable diagnostic devices.
Abstract
Polydiacetylenes (PDAs) are a unique class of conjugated polymers renowned for their pronounced chromo- and fluorogenic responses to external stimuli, enabling direct optical transduction of chemical and biological interactions. While early PDA-based sensing systems predominantly relied on solution-phase assemblies, their limited structural stability, reproducibility, and deployability have constrained practical applications. In recent years, the immobilization of PDAs onto solid supports has emerged as a powerful strategy to overcome these limitations, transforming responsive supramolecular polymers into robust, functional sensing platforms. Solid-supported PDA architectures offer enhanced mechanical stability, improved environmental tolerance, controlled molecular organization, and compatibility with portable and field-deployable devices. This review provides a comprehensive and application-oriented overview of solid-supported polydiacetylene systems for environmental and health monitoring. Emphasis is placed on the role of support materials, fabrication strategies, and structure-process-property relationships that govern sensing performance. Key applications in environmental pollutant detection and biomedical diagnostics are critically examined, alongside comparative performance metrics and design considerations. Current challenges, including signal irreversibility, environmental interference, and scalability, are discussed, and future directions toward sustainable fabrication, wearable devices, and integrated smart sensing platforms are outlined. By positioning solid-supported PDAs as adaptive interfaces between molecular recognition and macroscopic readout, this review highlights their potential as next-generation materials for decentralized and real-world sensing applications.
References
- 1.Thakuri, A., Banerjee, M., & Chatterjee, A. (2026). An update on polydiacetylene-based solid-supported sensing platforms for environmental and health monitoring. Chemical Communications, advance online publication. https://doi.org/10.1039/d6cc02242a
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