Figure 7.

Synthesis of methacrylated-gelatin hydrogel. (A) Gelatin macromers containing primary amine groups were reacted with methacrylic anhydride to add methacrylate pendant groups. (B) To create a hydrogel network, the methacrylated gelatin was crosslinked using UV light irradiation in the presence of a photoinitiator, i.e., Irgacure 2959, or VW light irradiation in the presence of the photoinitiators riboflavin and triethanolamine. The solution was free flowing before UV or VW light treatment, and gelation occurred after crosslinking.