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(A) Absolute polymer content in hydrogels prepared from 6 kDa PVA-ER (8, 12, or 16 wt %) after 1 h in PEG400 at 37 °C and incubation in PBS for 1 h at 37 °C. The values correspond to the absorbance measured after the direct addition of DTT to the hydrogels (n = 3; *p < 0.05). (B) DIC images of corresponding hydrogels in the dry state and after 1 h of PBS incubation. Scale bars: 10 μm.
