2.2 1H-Nuclear Magnetic Resonance
(1H-NMR) analysis
GelMA was confirmed by 1H-NMR. 30 mg/ml GelMA was
dissolved in deuterium oxide (D2O) (Sigma-Aldrich, USA)
at 40℃. 1H-NMR spectra were obtained by NMR
spectroscopy with a single axis gradient at 400 MHz
(1H-NMR, Bruker, Billerica, MA). Gelatin was used as a
control.