title: A novel multicompartimental system based on aminated poly(vinyl alcohol) microspheres/succinoylated pullulan microspheres for oral delivery of anionic drugs.
abstract: Poly(vinyl alcohol) (PVA) microspheres were prepared by dispersion reticulation with glutaraldehyde and further aminated. These microspheres were firstly loaded with diclofenac (DF) and then entrapped in cellulose acetate butyrate (CAB) microcapsules by an o/w solvent evaporation technique for intestinal delivery of drug. The encapsulated PVA microspheres due to their low swelling degree in intestinal fluids, do not have enough force to produce the disruption of CAB shell, therefore different amounts of succinoylated pullulan microspheres (SP-Ms) (exchange capacity up to 5.2 meq/g) were co-encapsulated. The SP-Ms do not swell in acidic pH, but swell up to 20-times in intestinal fluids causing the rupture of CAB shell and facilitating the escape of loaded PVA microspheres.
authors.affiliation: Department of Bioactive and Biocompatible Polymers, Petru Poni Institute of Macromolecular Chemistry, 700487 Iassy, Romania.
authors.forename: M
authors.initials: M
authors.lastname: Constantin
authors.forename: G
authors.initials: G
authors.lastname: Fundueanu
authors.forename: F
authors.initials: F
authors.lastname: Bortolotti
authors.forename: R
authors.initials: R
authors.lastname: Cortesi
authors.forename: P
authors.initials: P
authors.lastname: Ascenzi
authors.forename: E
authors.initials: E
authors.lastname: Menegatti
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry*; D002214:Capsules / Q000138:chemical synthesis; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry; D004008:Diclofenac / Q000008:administration & dosage / Q000737:chemistry; D016503:Drug Delivery Systems; D005936:Glucans / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D013386:Succinates / Q000737:chemistry; D013387:Succinic Anhydrides / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D002214:Capsules; D005936:Glucans; D013386:Succinates; D013387:Succinic Anhydrides; D004008:Diclofenac; C031801:succinic anhydride; C009109:pullulan; D011142:Polyvinyl Alcohol; D002482:Cellulose; C014396:cellulose acetate-butyrate