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The PVA-Mechano-Pharma Nexus: Mechano-Radical-Driven, Self-Regenerating Nano-Ecosystems for Autonomous Antimicrobial Synthesis, Targeted Modulation, and Closed-Loop Drug Delivery

DOI: 10.4236/jbm.2026.141020, PP. 248-273

Keywords: Mechano-Radical Ecosystem, Nanomedicine, Polyvinyl Alcohol, Self-Regenerating Network

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Abstract:

Polyvinyl Alcohol (PVA) is traditionally treated as a benign carrier in nanomedicine, yet emerging mechanochemical evidence suggests it can operate as a self-regulating therapeutic ecosystem. This work proposes the PVA-Mechano-Pharma Nexus, a framework in which mechanical deformation activates persistent mechano-radicals that store “chemical memory”, drive in situ drug synthesis, modulate therapeutic output, and ultimately trigger programmed material degradation. Electron Paramagnetic Resonance (EPR) studies reveal long-lived radical reservoirs within amorphous PVA, enabling autonomous grafting of quorum-sensing inhibitors, antibiotics, and other bioactive motifs via co-monomer trapping and dynamic transesterification. These reactions establish a continuously regenerating network capable of self-healing through metabolite-responsive Schiff-base chemistry and real-time self-reporting (spiropyran mechanophores, correlating with radical-driven release events). The resulting mechano-radical “seed libraries” support pathogen-responsive reaction networks that adapt therapeutic profiles over time, advancing the concept of self-evolving materials. Critically, the system closes its lifecycle through programmed ester hydrolysis and CO2-mediated biofilm disruption, achieving zero-waste disposal. Integrating these chemical, mechanical, and biological feedback loops positions PVA as a synthetic analog of autopoietic systems, raising new opportunities as well as regulatory challenges for autonomous medical implants. Finally, we outline translational pathways leveraging mechanochemical optimization, integration with bioelectronics and soft robotics, and the emergence of sustainable mechano-pharmacy. Collectively, this work redefines smart materials as autonomous therapeutic agents, establishing PVA as a prototype for closed-loop, mechanochemistry-driven nanomedicine.

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