Fig. 4From: Characterization of pH-responsive high molecular-weight chitosan/poly (vinyl alcohol) hydrogel prepared by gamma irradiation for localizing drug releasea Fourier transform infrared spectra of pure PVA, neat CS, non-irradiated CS/PVA, and b FTIR of crosslinked hydrogels irradiated at 10, 25, and 30 kGy; c solid-state 13C nuclear magnetic resonance spectrum of pure CS, neat PVA before and after irradiation, and the 50/50 CS/PVA hydrogelBack to article page