Fig. 1.

Characterisation of polymers and hydrogels. (A) A synthetic scheme of CS-BA polymer. (B) FT-IR spectra of CS, BA, CS-BA. (C) ¹H NMR spectra of CS, BA, CS-BA. (D) Optimisation of gelation time of CBP hydrogel (tested by the vial inverting method). (E) The porous structure of the CBP hydrogel, characterised by SEM on a scale of 10 $\mu$ m. (F) Optimisation of encapsulation efficiency (EE%) of GMs@Cel (X axis: weight of celecoxib fed initially (mg); Y axis: water phase: oil phase (V: V)). (G) the SEM characterisation of GMs@Cel, scale bar was 100 $\mu$ m. (H) photographs of CS-BA@INS, PVA, and GMs@Cel assembled into a CBP/GMs@Cel&INS hydrogel.