Fig. 1

Characterization of P-SA/Ins. A: Schematic and general view of P-SA/Ins. B: SEM images of each group. The scales bars: 500 μm and 100 μm. C: FI-TR spectra of gels of each group. D: The swelling ratio of each group in 37℃ PBS within 48 h. E: The cumulative released amount of insulin from SA/Ins and P-SA/Ins incubated in 37℃ PBS