Composite nano hydrogel with dual response and hierarchical drug release for enhanced wound healing

A novel nanocomposite hydrogel with photothermal therapeutic properties, which could enhance the healing of surgical wounds, was developed. The composite comprises functionalized silica nanoparticles (FSNs) loaded with desferoxamine (DFO) as the core and a dexamethasone (Dex) filled hyaluronic acid–chitosan hydrogel (HA-CS) as the shell. Dex can effectively control inflammation at the wound site, and DFO is beneficial in proliferating the skin cells. The two drugs effectively promote wound healing at the surgical site. The aim of this approach is to demonstrate the hierarchical and continuous release of Dex and DFO from the FSNs@DFO-H@Dex system to reduce wound inflammation and promote healing. Furthermore, the controlled release of DFO can be achieved by controlling the near-infrared illumination. The composite nano hydrogel has a photothermal response, which accelerates wound healing by effectively reducing inflammation through the controlled release of drugs and regulating the immunological response of damaged skin tissue.