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. Author manuscript; available in PMC: 2020 Oct 27.
Published in final edited form as: Adv Healthc Mater. 2020 Apr 23;9(15):e1901792. doi: 10.1002/adhm.201901792

Figure 1. Functionalization process to obtain the dual responsive hydrogels.

Figure 1

A) Schematic representation of the synthesis of GelMA and GelMA-Tyr; representative 1H-NMR spectra of gelatin, GelMA and GelMA-Tyr. B–G) 1H-NMR spectra of the functionalized hydrogels, showing the presence of the characteristic peaks for acrylates (a,b) in the GelMA and GelMA-Tyr groups and for the added phenolic groups in the GelMA-Tyr polymers.