“…Therefore, hydrogels, which combine drug release rate, cells, cytokines and other substances, are evaluated as a valuable drug delivery system for wound healing. [14,15] Hyaluronic acid (HA) as a natural non-branched polymer shows intriguing viscoelastic properties, good biocompatibility, biodegradability, and non-immunogenicity, and it can be gradually degraded in the presence of hyaluronidase and reactive oxygen species (ROS). [16][17][18] Meanwhile, HA-based hydrogels show well wound healing after chemically transformed or modified, and applications in tissue engineering, drug delivery and bioinstrumentation, especially on wound healing.…”