Research Article

Comparison of Rheological, Drug Release, and Mucoadhesive Characteristics upon Storage between Hydrogels with Unmodified or Beta-Glycerophosphate-Crosslinked Chitosan

Figure 1

The optical images of hydrogels with unmodified CS (F1, F2) or with bGP-crosslinked CS (F3, F4) after preparation (a–d) and upon 3-month (F1, F2) (e–f) or 6-month storage (g–h) at refrigerated conditions (F3, F4).