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. 2019 Oct 12;20(20):5061. doi: 10.3390/ijms20205061

Figure 2.

Figure 2

Here, 400-MHz 1H NMR spectra for unsubstituted gelatin and GelMA are shown. The peaks due to the added methacrylate were between 5 and 6 ppm and between 1.5 and 2 ppm. The peaks due to the lysine methylene from gelatin were between 2.5 and 3 ppm.