Poly-γ-Glutamic Acid Nanoparticles Based Visible Light-Curable Hydrogel for Biomedical Application

Figure 3

¹H NMR spectra of (a) γ-PGA and (b) MPGA-NP. Note: the chemical shift values of the methacryloyl groups are δ = 6.09, 5.70, and 1.88 and δ = 3.23, 3.62, and 3.70 (–CH₂) for the crosslinker. The base material chemical shifts are δ = 4.2 ppm (α-CH), δ = 2.4 ppm (γ-CH₂), and δ = 2.09 and 1.95 ppm (β and β′-CH₂).