Antibacterial conductive self-healable supramolecular hydrogel dressing for infected motional wound healing

作     者：Rui Yu Zhenlong Li Guoying Pan Baolin Guo 

作者机构：Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine ResearchCollege of StomatologyXi’an Jiaotong UniversityXi'an 710049China State Key Laboratory for Mechanical Behavior of MaterialsFrontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi'an710049China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2022年第65卷第11期

页      面：2238-2251页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(51973172) Natural Science Foundation of Shaanxi Province(2020JC-03,2019TD-020) the State Key Laboratory for Mechanical Behavior of Materials,the World-Class Universities(Disciplines) Characteristic Development Guidance Funds for the Central Universities Fundamental Research Funds for the Central Universities the Opening Project of the Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research,College of Stomatology,Xi’an Jiaotong University(2019LHM-KFKT008) 

主　　题：supramolecular hydrogel self-healing tissue adhesion joint wound 

摘      要：Wounds on stretchable parts of the human body cause prolonged suffering and involve more severe healing processes than wounds on stationary parts. However, they have received insufficient attention compared with other types of chronic wounds. In this study, a novel supramolecular gelatin(GT) hydrogel composed of GT-graft-aniline tetramer and quaternized chitosan was presented. The hydrogel was crosslinked by monoaldehyde β-cyclodextrin via host-guest interaction and dynamic Schiff base and was free from permanent covalent bonds, heavy metals, and oxidants. Given its dynamic feature, the hydrogel exhibited flexibility, self-healing, and tissue adhesiveness and well adapted to motion wounds. Moreover, the hydrogel was bioactive with conductivity, antioxidant property, hemostatic effect, antibacterial, and photothermal effect(the killing ratio for methicillinresistant Staphylococcus aureus(MRSA) was higher than 99.8% after 5 min of near-infrared irradiation) and exhibited ondemand removability. In the full-thickness MRSA-infected motional wound healing experiment, this novel hydrogel exhibited a significantly enhanced wound healing efficacy with a fast wound closure ratio(about 99.0% for 14 days), mild inflammatory response, high level of collagen deposition, and enhanced re-epithelialization by downregulating interleukin-6 and CD68 and upregulating vascular endothelial growth factor. The results indicated that this hydrogel has great potential in wound healing and skin tissue engineering and serves as an inspiration for the design of supramolecular biomaterials.