title: The preparation and characterization of poly(lactide-co-glycolide) microparticles. II. The entrapment of a model protein using a (water-in-oil)-in-water emulsion solvent evaporation technique.
abstract: Poly(lactide-co-glycolide) (PLG) microparticles with entrapped antigens have recently been investigated as controlled-release vaccines. This paper describes the preparation of PLG microparticles with an entrapped model antigen, ovalbumin (OVA), using a (water-in-oil)-in-water emulsion solvent evaporation technique. In a series of experiments, the effects of process parameters on particle size and OVA entrapment were investigated. It was found that smooth, spherical microparticles 1-2 microns in diameter containing up to 10% (w/w) OVA could be produced using a small volume of external aqueous phase containing a high concentration of emulsion stabilizer and a 1:5 antigen:polymer ratio. PAGE analysis, isoelectric focusing, and Western blotting of OVA released from the microparticles in vitro confirmed that the molecular weight and antigenicity of the protein remained largely unaltered by the entrapment procedure.
authors: Department of Pharmaceutical Sciences, University of Nottingham, United Kingdom.
authors: H
authors: H
authors: Jeffery
authors: S S
authors: SS
authors: Davis
authors: D T
authors: DT
authors: O'Hagan
mesh_terms: D015153:Blotting, Western; D004339:Drug Compounding; D004591:Electrophoresis, Polyacrylamide Gel; D004655:Emulsions; D007525:Isoelectric Focusing; D008863:Microspheres; D008970:Molecular Weight; D010047:Ovalbumin / Q000737:chemistry* / Q000276:immunology; D010316:Particle Size; D011098:Polyglactin 910 / Q000737:chemistry*; D012997:Solvents; D014783:Viscosity
chemical_list: D004655:Emulsions; D012997:Solvents; D011098:Polyglactin 910; D010047:Ovalbumin