title: Composite microparticle drug delivery systems based on chitosan, alginate and pectin with improved pH-sensitive drug release property.
abstract: Composite microparticle drug delivery systems based on chitosan, alginate and pectin with improved pH sensitivity were developed for oral delivery of protein drugs, using bovine serum albumin (BSA) as a model drug. The composite drug-loaded microparticles with a mean particle size less than 200mum were prepared by a convenient shredding method. Since the microparticles were formed by tripolyphosphate cross-linking, electrostatic complexation by alginate and/or pectin, as well as ionotropic gelation with calcium ions, the microparticles exhibited an improved pH-sensitive drug release property. The in vitro drug release behaviors of the microparticles were studied in simulated gastric (pH 1.2 and pH 5.0), intestinal (pH 7.4) and colonic (pH 6.0 and pH 6.8 with enzyme) media. For the composite microparticles with suitable compositions, the releases of BSA at pH 1.2 and pH 5.0 could be effectively sustained, while the releases at pH 7.4, pH 6.8 and pH 6.0 increased significantly, especially in the presence of pectinase. These results clearly suggested that the microparticles had potential for site-specific protein drug delivery through oral administration.
authors.affiliation: Key Laboratory of Biomedical Polymers of Ministry of Education, Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Cui-Yun
authors.initials: CY
authors.lastname: Yu
authors.forename: Bo-Cheng
authors.initials: BC
authors.lastname: Yin
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Si-Xue
authors.initials: SX
authors.lastname: Cheng
authors.forename: Xian-Zheng
authors.initials: XZ
authors.lastname: Zhang
authors.forename: Ren-Xi
authors.initials: RX
authors.lastname: Zhuo
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000818:Animals; D002417:Cattle; D048271:Chitosan / Q000737:chemistry*; D016503:Drug Delivery Systems; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D010368:Pectins / Q000737:chemistry*; D011096:Polygalacturonase / Q000494:pharmacology; D012710:Serum Albumin, Bovine / Q000494:pharmacology*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D012710:Serum Albumin, Bovine; D010368:Pectins; D020723:Glucuronic Acid; D048271:Chitosan; D011096:Polygalacturonase