Effective wound dressing based on Poly (vinyl alcohol)/Dextran-aldehyde composite hydrogel.

Wound dressing is of significant importance to promote cutaneous wound healing process. To develop an effective wound dressing, a PVA/DA hydrogel was prepared using a Poly (vinyl alcohol)/Dextran-aldehyde solution blend, followed by crosslinking via freeze-thaw method and freeze-drying. We characterized the hydrogel by infrared spectroscopy, mechanical property tests, swelling behavior test and biocompatibility test. Results showed that the PVA/DA hydrogels had a 3-dimensional, highly porous structure with uniformly distributed pores of 5-10 μm, strong tensile strength of 5.6 MPa, efficient ability to absorb fluid of 6 time its weight and suitable water vapor transmission rate of 2100 g m-2day-1 to keep a moist environment and good biocompatibility shown by very low hemolysis and no cytotoxicity. In wound healing tests using a full-thickness skin wound model, macroscopic observations showed that the wound covered by the PVA/DA hydrogel almost reached complete healing faster by 10 days, while histological analysis indicated a faster regeneration of skin. Thus, the PVA/DA hydrogel was suitable for application as a wound dressing and may have potential for use in various biomedical applications.