Evaluation of Functional Electrospun Chitosan-Based Nanofibers Loaded with Norfloxacin for Enhanced Burn Wound Healing Response

Nanofibrous materials based on chitosan (CS) have attracted considerable attention for advanced wound management due to their excellent biocompatibility and their suitability as drug delivery systems for wound healing applications. Additional surface modification may improve their interaction with the wound environment and influence tissue repair mechanisms. TMC/CS nanofibers were fabricated via electrospinning and subsequently processed into three formulations: unloaded fibers (NCC), norfloxacin-loaded fibers (NCX), and norfloxacin-loaded fibers modified with 2-formylphenylboronic acid (NCXA). The resulting materials were characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and UV–Vis spectroscopy. Their therapeutic performance was evaluated in a standardized deep dermal burn model in Wistar rats, with Vaseline gauze and silver sulfadiazine serving as reference treatments. Wound healing progression was assessed through macroscopic examination, histopathological analysis, immunohistochemical evaluation of TNF-α, IL-1β, IL-17, VEGF, VCAM, and CD163 expression, and systemic IL-8 determination. Physicochemical characterization confirmed homogeneous nanofiber formation, efficient incorporation of norfloxacin, and successful surface modification. All electrospun formulations promoted improved healing outcomes compared with the untreated control group. Among them, the norfloxacin-loaded nanofiber formulation demonstrated the most pronounced wound-healing effect, characterized by faster re-epithelialization, attenuation of inflammatory mediators during later healing stages, and superior tissue architecture restoration. Conversely, the 2-formylphenylboronic acid-modified norfloxacin-loaded fiber formulation maintained a more persistent inflammatory state and exhibited a slower transition into the remodeling phase. Trimethyl chitosan-based nanofibers loaded with norfloxacin show strong potential as multifunctional wound dressing platforms capable of controlled drug release. The findings indicate that formulation composition plays a critical role in regulating inflammation and tissue regeneration, underscoring the need for continued refinement of chitosan-derived nanosystems for burn wound therapy.