Preparation of pectin-chitosan hydrogels based on bioadhesive-design micelle to prompt bacterial infection wound healing.

The aim of this study was to design a pectin-chitosan (PEC-CS) hydrogel loaded with a bioadhesive-design micelle containing large amount of ciprofloxacin for antibacterial and healing wound applications. Pectin and chitosan are crosslinked in a safe and convenient way, and the PEC-CS hydrogel have high water content (>95 %), strong water absorption (15,000 %), good water retention (>10,000 % at 30 % RH for 12 h), and the PEC-CS hydrogels showed no cytotoxicity and hemolysis, thus providing a humid microenvironment suitable for wound. Additionally, the dopamine modified carrier can greatly improve the solubility and retention time in the wound of ciprofloxacin, effectively increase the efficiency of drug loading into the PEC-CS hydrogels and exert antibacterial activity in the wound for a long time. In vitro and in vivo pharmacodynamics experiments have shown that PEC-CS#CIP@DPDMCs hydrogels can resist bacteria and promote wound healing. Thus，The PEC-CS#CIP@DPDMCs hydrogels can be a potential anti-infective hydrogel excipient.