Encapsulation of Hydrogen Peroxide in PVA/PVP Hydrogels for Medical Applications.

Area of Science:

• Polymer Science and Biomaterials Engineering
• Biomedical Engineering and Drug Delivery
• Materials Science and Nanotechnology

Background:

• Biodegradable polymers and copolymers are crucial for medical, industrial, and environmental applications.
• Developing advanced hydrogels with tunable properties like water absorbency and mechanical strength is essential for effective medical devices.
• Controlled release systems are needed to enhance therapeutic efficacy and patient outcomes, particularly in wound management.

Purpose of the Study:

• To introduce a novel, straightforward method for preparing biodegradable hydrogels based on polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP).
• To investigate the potential of these PVA/PVP hydrogels for controlled release of hydrogen peroxide (HP) for medical applications, specifically wound healing.
• To enhance the water resistance and mechanical properties of the hydrogels for improved performance and broader applicability.

Main Methods:

• Preparation of PVA/PVP hydrogels using freeze-thaw cycles and chemical crosslinking with trisodium trimetaphosphate (STMP).
• Characterization of hydrogel structure and morphology using Fourier transform infrared spectroscopy (FTIR) and environmental scanning electron microscopy (E-SEM).
• Evaluation of hydrogen peroxide (HP) controlled release kinetics using an ex vivo skin model and assessment of antibacterial activity against medically relevant bacteria via disk diffusion assay.

Main Results:

• The synthesized PVA/PVP hydrogels exhibited enhanced water absorbency, biocompatibility, and biodegradability.
• Freeze-thaw cycles and STMP crosslinking improved hydrogel water resistance and mechanical properties, mitigating premature dissolution.
• The hydrogels demonstrated effective controlled release of HP and significant antibacterial activity against *Staphylococcus aureus*, *Enterococcus faecalis*, *Escherichia coli*, and *Pseudomonas aeruginosa*.

Conclusions:

• The developed PVA/PVP hydrogels offer a promising, environmentally friendly platform for controlled HP delivery in medical applications.
• The enhanced mechanical properties and controlled release capabilities make these hydrogels suitable for wound healing and other hygiene products.
• Further in vivo studies are warranted to validate the efficacy of these controlled HP release systems for improved wound-healing outcomes.