Preparation and evaluation of dual drug-loaded nanofiber membranes based on coaxial electrostatic spinning technology

Wound healing is a complicated process consisting of wound bleeding, inflammatory response, cell proliferation and tissue remodeling. During this long-term period, wound is vulnerable to infection by bacteria or microbes. Therefore, we prepared a novel centella total glucoside-ciprofloxacin dual-loaded coaxial nanofiber membrane (CDCNM) by using coaxial electrostatic spinning technique. To satisfy personalized therapeutic demands by adjusting release behaviors, we loaded centella total glucoside (CTG) and ciprofloxacin (CIP) into different positions of the fibers and the morphology and coaxial structure of the nanofiber membranes were analyzed by SEM and TEM. In addition, water contact angle, water absorption capacity, breathability and in vitro drug release were tested. In vitro cell experiments demonstrated that CDCNM can promote fibroblast proliferation. CDCNM demonstrated excellent antimicrobial activity through the agar flat dish diffusion method. Furthermore, rat scald experiments showed that CDCNM significantly accelerated scald healing, meanwhile immunohistochemical staining showed that CDCNM promoted the expression of CD31 and VEGF during early wound healing, which accelerated scald healing by promoting neovascularization and endothelial cell proliferation. As a topical multifunctional wound dressing, this dual drug-loaded nanofiber membrane achieved scald healing effect and continuous bacterial inhibition, which provides new ideas for existing trauma treatment tools and dual drug delivery systems.