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A novel polyelectrolyte complex (PEC) of carboxymethyl starch (CMS) and chitosan was prepared, characterized and tested in vitro as a carrier for oral drug delivery. This PEC, containing 14% (w/w) of chitosan, showed a polymorphism with a lower order degree than those of CMS and of chitosan. Under conditions simulating the gastrointestinal transit, NMR imaging analysis showed slower fluid diffusion...
Thermo- and pH-sensitive hydrogels were prepared by graft copolymerization of chitosan (CS) and N-isopropylacrylamide via γ-radiation. The effects of monomer concentration and irradiation dose on grafting percentage and grafting efficiency were studied. The graft copolymers were characterized by 13 C CP/MAS NMR and thermogravimetric analysis. The pH and thermosensitivity and swelling properties...
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