Reduction in wound bioburden using a silver-loaded dissolvable microfilm construct

Area of Science:

• Biomaterials Science
• Nanotechnology
• Wound Healing Research

Background:

• Silver is a common antimicrobial, but conventional dressings cause wound staining, toxicity, and healing inhibition.
• Polymeric nanofilms with silver nanoparticles show antimicrobial efficacy at significantly lower silver concentrations.
• Existing silver dressings face limitations in delivery and biocompatibility for effective wound management.

Purpose of the Study:

• To fabricate and characterize novel dissolvable microfilm constructs for in vivo wound application.
• To evaluate the antimicrobial efficacy and wound healing potential of silver-loaded nanofilms.
• To overcome the limitations of conventional silver-based wound care products.

Main Methods:

• Fabrication of composite microfilms: silver nanoparticle-loaded polymeric nanofilms laminated with polyvinylalcohol (PVA).
• In vitro assessment: silver release kinetics and antimicrobial activity against Staphylococcus aureus.
• In vivo studies: evaluation in mice with contaminated and uncontaminated wounds.

Main Results:

• The PVA layer dissolves on moist wounds, immobilizing the silver-loaded nanofilm.
• In vitro studies demonstrated sustained silver release (<1 μg cm⁻² d⁻¹) and potent killing of S. aureus (5 log10 CFU reduction in 24 h).
• In vivo, silver/nanofilms reduced bacterial burden by up to 3 log10 in contaminated wounds and promoted complete re-epithelialization in uncontaminated wounds.

Conclusions:

• Dissolvable silver/nanofilm constructs provide an effective and biocompatible method for silver delivery in wound healing.
• These novel dressings overcome key limitations of traditional silver agents, reducing toxicity and enhancing healing.
• The technology holds promise for advanced wound care by improving antimicrobial delivery and patient outcomes.