Fig. 7.

Schematic illustration of preparation of oxidized dextran (A) and GelMA(B). (A) Dextran was oxidized by NaIO4 to generate aldehyde groups (red) which can bond to amino groups through Schiff base reaction. (B) GelMA was formed by the reaction between gelatin and methacrylic anhydride. (C) Fabrication process of hydrogel scaffolds: Gelatin, GelMA, and oxidized dextran were firstly mixed with photoinitiator LAP. The mixed solution was pipetted into molds and allowed the Schiff base reaction. After final gelation by UV irradiation, hydrogels were formed and removed from molds. (D) Gross view of different phases of GelMA and M-O-G (Reprinted from Refs. [35] with permission from Elsevier).