An injectable, self-healing and degradable hydrogel scaffold as a functional biocompatible material for tissue engineering applications

Injectable hydrogels derived from natural extracellular matrices exhibit excellent adhesion to endothelial cells in vitro and are ideal for many biomedical applications. However, their applicability in vivo is limited by the risk of infection or immunogenicity, and the current injectables also suffer from degradation, viscosity, and drug release. In this study, a multifunctional hydrogel scaffold (COB hydrogels) was constructed by incorporating bioactive glass nanoparticles with a Schiff base crosslinking-based hydrogel composed of carboxymethyl chitosan and oxidized cellulose. The incorporation of nanoparticles not only shortened the gelation time of the COB hydrogels, but also enhanced the performance of the hydrogel in terms of function, such as drug loading capacity. The prepared hydrogels also have self-healing ability, injectability, drug loading and sustained release, antibacterial properties and biocompatibility. In addition, given their no cytotoxicity and mild inflammation in vivo, the hydrogel scaffolds will be important for tissue engineering and drug delivery applications.