title: Preparation of ionic-crosslinked chitosan-based gel beads and effect of reaction conditions on drug release behaviors.
abstract: Drug-loaded chitosan (CS) beads were prepared under simple and mild condition using trisodium citrate as ionic crosslinker. The beads were further coated with poly(methacrylic acid) (PMAA) by dipping the beads in PMAA aqueous solution. The surface and cross-section morphology of these beads were observed by scanning electron microscopy and the observation showed that the coating beads had core-shell structure. In vitro release of model drug from these beads obtained under different reaction conditions was investigated in buffer medium (pH 1.8). The results showed that the rapid drug release was restrained by PMAA coating and the optimum conditions for preparing CS-based drug-loaded beads were decided through the effect of reaction conditions on the drug release behaviors. In addition, the drug release mechanism of CS-based drug-loaded beads was analyzed by Peppa's potential equation. According to this study, the ionic-crosslinked CS beads coated by PMAA could serve as suitable candidate for drug site-specific carrier in stomach.
authors: Department of Chemistry and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China.
authors: Shilan
authors: S
authors: Chen
authors: Mingzhu
authors: M
authors: Liu
authors: Shuping
authors: S
authors: Jin
authors: Bin
authors: B
authors: Wang
mesh_terms: D000042:Absorption; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry; D001241:Aspirin / Q000008:administration & dosage / Q000737:chemistry; D002626:Chemistry, Pharmaceutical; D048271:Chitosan / Q000737:chemistry*; D002951:Citrates / Q000737:chemistry; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D005612:Freeze Drying; D005782:Gels; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011109:Polymethacrylic Acids / Q000737:chemistry
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002951:Citrates; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D005782:Gels; D011109:Polymethacrylic Acids; C514290:trisodium citrate; C030613:polymethacrylic acid; D048271:Chitosan; D001241:Aspirin