The hydrogels were incubated in the cells for 24 and 96 h. After the incubation time, 100 µL was taken of each well in three replicates and treated with 10% of PrestoBlue™ solution for 3 h, and the absorbance values at 570 nm were measured using a microplate reader. Non-treated cells were used as a positive control, and cells treated with 5 mM GSH were used as a control for the degradation experiment.