2.4. Characterization of Hydrolytic Degradation

The weight loss method was used for the characterization of the hydrogel degradation performance in PBS. In this experiment, the same qualities of n-HA/Fe₂O₃/PVA hydrogel and pure PVA hydrogel were suspended in a PBS (pH 7.5) incubator at 37 °C for degradation experiments. At the selected time points (0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 days), the qualities of the hydrogels in each group were measured.