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In vitro characterization and property determination of hydrogels. (A) Comparison of SEM images of hydrogels; (B) Observation of the overall macroscopic transparency of the hydrogel after UV irradiation; (C) FTIR image analysis; (D) Swelling rate of hydrogel in PBS at 37 °C; (E) Study of water retention properties of hydrogels at different time points under 37 °C; (F) Enzymatic reaction of hydrogel in collagenase solution (5 mg/mL) at 37 ℃. Scale bar: 100 μm.
