Electrospun Nano‐CaO₂/Polycaprolactone/Gelatin Nanofibers and Their Wound Healing Application through In Situ Supplying H₂O₂

Abstract

Skin is highly susceptible to foreign pathogens when damaged. Infections usually lead to serious damage to wounds and hinder wound healing, which results in nonhealing and inflammation of the wounds. Herein, a kind of fibrous membrane incorporated with calcium peroxide nanoparticles (n‐CaO2) is fabricated by electrospinning the polymer blend solution of polycaprolactone and gelatin. The obtained membranes show a randomly distributed nanofibrous structure with n‐CaO2 particles embedded in each fiber. Such a structure endows the membranes with medium hydrophilicity and improves blood clotting in comparison with the commonly used gauze, while the loading of n‐CaO2 achieves the in situ generation and rapid release of hydrogen peroxide (H2O2), enabling FM‐10 to display a robust bacteria inhibition of over 90% elimination to E. coli. The in vitro cytocompatibility experiment on the fibrous membranes demonstrates low cytotoxicity to L929 fibroblasts. The in vivo assessment indicates that the fibrous membranes can distinctly accelerate the wound healing, of which FM‐5 exhibits the highest wound closure rate (>95%) after 14 days. This study provides a versatile approach, simply by varying the loading dosage of n‐CaO2 into fiber matrix, to fulfill different functions to meet the multiple needs of wound care.

Co-, N-doped carbon dot nanozymes based on an untriggered ROS generation approach for anti-biofilm activities and in vivo anti-bacterial treatment

“…27–29 However, the utilization of H 2 O 2 as an additional substrate for sustained enzymatic reactions restricts in vivo applications of peroxidase-like nanozymes, limiting their potential for further use. 30–32 Therefore, developing light-free and H 2 O 2 -free nanomaterials to generate ROS, namely untriggered generation ROS agents, for treating bacterial infection is very important and necessary.…”