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. 2021 Feb 6;22(4):1635. doi: 10.3390/ijms22041635

Figure 1.

Figure 1

Gelatin methacryloyl–riboflavin (GelMA-RF) before and after photopolymerization. The three images show a 20% GelMA-RF hydrogel before and after photopolymerization under visible-wavelength (VW) light. Before photopolymerization, the GelMA–RF hydrogel was translucent and dark yellow. After 20 s of photopolymerization, the GelMA–RF hydrogel was translucent and pale yellow. After 60 s of photopolymerization, the GelMA–RF hydrogel was almost completely transparent. Furthermore, 10% and 15% (w/v) GelMA–RF gels were too weak to be handled for testing after 20 s and 60 s of photopolymerization (data not shown).