Genipin Cross-Linked Chitosan-Polyvinylpyrrolidone Hydrogels: Influence of Composition and Postsynthesis Treatment on pH Responsive Behaviour

Figure 3

Relative volumetric swelling of LHL hydrogels listed in Table 2 following freezing and freeze-thaw treatment. Sample composition: 0.2 mL Cht solution, 0.5 mL PVP solution, and 0.004 mL Gen solution. Average molar ratio of Cht : PVP : Gen = 1 : 49 : 7.