Self-absorbing multilayer skin-like composite with Phyllostachys nigra polysaccharides promotes wound healing

Biocompatible and mechanically stable porous hydrogels are promising materials for artificial skin in wound healing. The rigid PVA phase was selected to make the scaffold, and a dense and uniform porous phase was formed in both transverse and longitudinal phases by freezing casting technology. The names PVA and PVA + PNS2A were used in in vitro activity tests using polymer solutions that had not been molded before. The crosslinked materials were named Base, CP1 (0.1% PNS2A), and CP2 (0.5% PNS2A). HUVEC and HaCat cell proliferation experiments proved to be safe and non-toxic and significantly promoted proliferation activity after 48 h. The cell model with Raw 264.7 proved anti-inflammatory effect by mixed polymer solution. The scratch test showed that the CP2 promotes the migration of HaCat cells more effectively at 48 h. The cell adhesion experiment showed that the skin-like composite material grew rapidly along the void direction. Animal experiments showed that the multi-layer skin-like CP2 increased the mechanical properties, gelation, and hemostasis (58.8% reduction) and inhibits inflammation through active polysaccharide in the early stage of wound healing. It promoted collagen formation in the late stages of the healing process. Upon contact with the wound, the material undergoes gelation to isolate the wound and completely healed the hurt after 12 days. Stent disintegration and 48-h absorption time provide support for implant material development.