Innovative Approach to Accelerate Wound Healing: Synthesis and Validation of Enzymatically Cross-linked COL-rGO-PDA Biocomposite Hydrogels

In this study, an innovative conductive hybrid biomaterial was synthetized using collagen and reduced graphene oxide (rGO) in order to be used as wound dressing. The collagen hydrogels (COL) were plasticized with glycerol and enzymatically cross-linked with horseradish peroxidase (HRP). A successful interaction among the components was demonstrated by FTIR, XRD, and XPS. It was demonstrated that increasing the rGO concentration led to higher conductivity and negative charge density values. Moreover, rGO also improved the stability of hydrogels which has expressed by a reduction of the biodegradation rate. Furthermore, the hydrogel’s stability, against the enzymatic action of collagenase type I, was also strengthened by both the enzymatic cross-linking and the polymerization of dopamine. However, their absorption capacity, reaching values of 215 g/g, indicates the high potential of the hydrogels to absorb fluids. The rise of these properties positively influenced the wound closure process, achieving an 84.5% in vitro closure rate after 48 h. These findings clearly demonstrate that these original composite biomaterials can be a viable choice for wound healing purposes.