title: Novel complex hydrogels based on N-carboxyethyl chitosan and quaternized chitosan and their controlled in vitro protein release property.
abstract: A novel pH-responsive hydrogel (CHC) composed of N-carboxyethyl chitosan (CEC) and N-[(2-hydroxy-3-trimethylammonium) propyl] chitosan chloride (HTCC) was synthesized by the redox polymerization technique. Turbidimetric titrations were used to determine the stoichiometric ratio of these two chitosan derivatives. The hydrogel was characterized by FT-IR, thermal gravimetric analysis (TGA), X-ray diffractometry (XRD), and scanning electron microscopy (SEM). The dynamic transport of water showed that the hydrogel reached equilibrium within 48h. The swelling ratio of CHC hydrogel depended significantly on the pH of the buffer solution. The performance of the CHC as a matrix for the controlled release of BSA was investigated. It was found that the release behavior was determined by pH value of the medium as well as the intermolecular interaction between BSA and the hydrogels.
authors.affiliation: Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, China.
authors.forename: Hebing
authors.initials: H
authors.lastname: Hu
authors.forename: Lin
authors.initials: L
authors.lastname: Yu
authors.forename: Songwei
authors.initials: S
authors.lastname: Tan
authors.forename: Kehua
authors.initials: K
authors.lastname: Tu
authors.forename: Li-Qun
authors.initials: LQ
authors.lastname: Wang
mesh_terms: D002021:Buffers; D048271:Chitosan / Q000737:chemistry*; D003692:Delayed-Action Preparations; D004337:Drug Carriers / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D011506:Proteins / Q000008:administration & dosage / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D002021:Buffers; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D020100:Hydrogels; C118071:N-trimethyl chitosan chloride; D011506:Proteins; D048271:Chitosan