Development of Films for Wound Healing Based on Gelatin and Oil/Water Emulsions as Carriers of Bioactive Compounds.

Background: Natural biopolymeric matrices for developing dressings have been extensively studied, as they may exhibit beneficial properties for wound healing. Gelatin possesses promising structural and physicochemical properties for incorporating active compounds (ACs). O/W emulsions are an alternative delivery system for AC with different properties and solubilities, promoting wound healing. Objective: This study aimed to develop gelatin films by adding silver nanoparticles and healing agents encapsulated in an O/W emulsion to treat skin wounds. Methods: A film-forming dispersion was prepared using gelatin and glycerol as a plasticizer, and films were obtained using the casting technique. Emulsions with ACs (EAs) and without ACs (ECs) were incorporated into the films. The formulations were analyzed by FESEM and characterized for their mechanical, thermal, and swelling properties, as well as their water vapor permeability. Results: The results showed that films with a higher amount of emulsion exhibited greater structural rigidity and lower permeability, while films with lower amounts of emulsion demonstrated more elasticity and higher permeability. General and organ-specific toxicity were evaluated in zebrafish larvae. The films showed no lethal or sub-lethal effects on the morphology or activity of the brain, heart, and liver. Conclusions: The active films developed could provide stable support and a safe delivery system for active compounds to treat skin lesions, minimizing the risk of infection and the need to heal a wound.