ABSTRACT
Hydroxyethyl chitin (HECH) is a water soluble chitin derivative made by etherification of chitin, ethylene chlorohydrin was used as etherification reagent in this reaction. A novel interpenetrating polymer network (IPN) composed of HECH/PAA was prepared. The IR spectra confirmed that HECH/PAA was formed through chemical bond interaction. The sensitivity of this hydrogel to temperature and pH was studied. The swelling ratio of this hydrogel in artificial intestinal juice is much greater than that in artificial gastric juice. The IPN hydrogel exhibited a typical pH-sensitivity, and its degree of swelling ratio increased with the increase of temperature. The sustained-release drug system of Dichlofenac potassium was prepared by using HECH/PAA as the drug carrier. The release experiment showed a perfect release behavior in artificial intestinal juice. This IPN is expected to be used as a good drug delivery system of enteric medicine.
Subject(s)
Acrylates , Chemistry , Anti-Inflammatory Agents, Non-Steroidal , Chitin , Chemistry , Delayed-Action Preparations , Diclofenac , Drug Carriers , Drug Delivery Systems , Hydrogel, Polyethylene Glycol Dimethacrylate , Chemistry , Hydrogen-Ion ConcentrationABSTRACT
The characters of the chemical structure of CM-chitosan were studied, by assay the content of the N, carboxylation, Primary amine and DEPT,13C-NMR of CM-chitosan.