title: A novel in situ-formed hydrogel wound dressing by the photocross-linking of a chitosan derivative.
abstract: In situ photopolymerized hydrogel dressings create minimally invasive methods that offer advantages over the use of preformed dressings such as conformability in any wound bed, convenience of application, and improved patient compliance and comfort. Here, we report an in situ-formed hydrogel membrane through ultraviolet cross-linking of a photocross-linkable azidobenzoic hydroxypropyl chitosan aqueous solution. The hydrogel membrane is stable, flexible, and transparent, with a bulk network structure of smoothness, integrity, and density. Fluid uptake ability, water vapor transmission rate, water retention, and bioadhesion of the thus resulted hydrogel membranes (0.1 mm thick) were determined to range from 97.0-96.3%, 2,934-2,561 g/m(2)/day, 36.69-22.94% (after 6 days), and 4.8-12.3 N/cm(2), respectively. These data indicate that the hydrogel membrane can maintain a long period of moist environment over the wound bed for enhancing reepithelialization. Specifically, these properties of the hydrogel membrane were controllable to some extent, by adjusting the substitution degree of the photoreactive azide groups. The hydrogel membrane also exhibited barrier function, as it was impermeable to bacteria but permeable to oxygen. In vitro experiments using two major skin cell types (dermal fibroblast and epidermal keratinocyte) revealed the hydrogel membrane have neither cytotoxicity nor an effect on cell proliferation. Taken together, the in situ photocross-linked azidobenzoic hydroxypropyl chitosan hydrogel membrane has a great potential in the management of wound healing and skin burn.
authors.affiliation: Department of Burn and Plastic Surgery, Wuxi third People's Hospital, Wuxi, China.
authors.forename: Guozhong
authors.initials: G
authors.lastname: Lu
authors.forename: Kai
authors.initials: K
authors.lastname: Ling
authors.forename: Peng
authors.initials: P
authors.lastname: Zhao
authors.forename: Zhenghong
authors.initials: Z
authors.lastname: Xu
authors.forename: Cao
authors.initials: C
authors.lastname: Deng
authors.forename: Hua
authors.initials: H
authors.lastname: Zheng
authors.forename: Jin
authors.initials: J
authors.lastname: Huang
authors.forename: Jinghua
authors.initials: J
authors.lastname: Chen
mesh_terms: D000268:Adhesiveness; D000818:Animals; D001458:Bandages / Q000009:adverse effects / Q000382:microbiology; D001672:Biocompatible Materials; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D048271:Chitosan; D003432:Cross-Linking Reagents; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D008567:Membranes, Artificial; D010539:Permeability; D012867:Skin; D013552:Swine; D014466:Ultraviolet Rays; D014870:Water Loss, Insensible; D014945:Wound Healing
chemical_list: D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D008567:Membranes, Artificial; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D048271:Chitosan