We fabricated ferric ion-cross-linked hydrogels of a chelating hyaluronic acid (HA) derivative. HA was conjugated with iminodiacetic acid (IDA) at 22% of a modification degree to its disaccharide unit of HA. This conjugate (HA-IDA) showed degradability by hyaluronidase even after the IDA modification, and its degradation rate was almost the same as that of HA.
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