title: Modulation of protein release from chitosan-alginate microcapsules using the pH-sensitive polymer hydroxypropyl methylcellulose acetate succinate.
abstract: The release characteristics of protein from chitosan-alginate microcapsules prepared using an electrostatic droplet generator were evaluated. The release studies were undertaken in-vitro in simulated gastrointestinal fluids covering the pH range 1.2-8. Chitosan-alginate microcapsules showed unsatisfactory release properties, losing 94% of the encapsulated proteins (bovine serum albumin) over a 24 h period at pH 1.2. Incorporation of a pH-sensitive polymer, hydroxypropyl methylcellulose acetate succinate (HPMCAS), in the microcapsules, by coating the capsule membrane as well as blending with the capsule core polymer in varying ratios, produced significant changes in the release profiles of the microcapsules. At pH 1.2, the modified microcapsules retained up to 60% of the encapsulated protein after 24 h. The results obtained highlight the potential of HPMCAS as a release-modifier in chitosan-alginate microcapsules.
authors.affiliation: Department of Pharmaceutics and Pharmaceutical Technology, University of Benin, Nigeria.
authors.forename: A O
authors.initials: AO
authors.lastname: Okhamafe
authors.forename: B
authors.initials: B
authors.lastname: Amsden
authors.forename: W
authors.initials: W
authors.lastname: Chu
authors.forename: M F
authors.initials: MF
authors.lastname: Goosen
mesh_terms: D000336:Aerosols; D000464:Alginates / Q000378:metabolism*; D002214:Capsules / Q000737:chemistry; D002686:Chitin / Q000031:analogs & derivatives* / Q000378:metabolism; D048271:Chitosan; D004064:Digestive System / Q000378:metabolism; D004339:Drug Compounding / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000378:metabolism; D008853:Microscopy; D010316:Particle Size; D012709:Serum Albumin / Q000378:metabolism*; D013501:Surface-Active Agents / Q000494:pharmacology
chemical_list: D000336:Aerosols; D000464:Alginates; D002214:Capsules; D012709:Serum Albumin; D013501:Surface-Active Agents; D002686:Chitin; C048331:hydroxypropylmethylcellulose acetate succinate; D008747:Methylcellulose; D048271:Chitosan