The swelling and drug release behavior of hydrogel were also investigate.Hydrogel shrunk most at isoelectric point (IEP) and with the deviation of IEP, the swelling degree increased.

• 凝胶呈现出典型的聚电解质水凝胶的溶胀特点，在等电点下溶胀度最小，偏离等电点时溶胀度增大。