title: Influence of the primary emulsification procedure on the characteristics of small protein-loaded PLGA microparticles for antigen delivery.
abstract: Microparticles prepared from poly(lactic-co-glycolic acid) (PLGA) using a W1/O/W2 double emulsion solvent evaporation method are suitable vehicles for the delivery of proteins to antigen presenting cells, e.g. dendritic cells. In this study, the influence of different techniques for the preparation of the primary W1/O emulsion was investigated with respect to the protein localization within the microparticles, morphological characteristics of these particles, protein burst release and the native state of the released protein. Bovine serum albumin bearing fluorescein isothiocyanate (FITC-BSA) was used as model protein. A static micromixer was applied for the preparation of the W1/O/W2 double emulsion. Employing a rotor-stator homogenizer (Ultra-Turrax) for primary emulsification, microcapsules with a high burst release were produced, because nearly all FITC-BSA was attached to the outside of the particle wall. Using a high pressure homogenizer or an ultrasonic procedure resulted in the formation of microspheres with homogeneous protein distribution and a reduced burst release.
authors.affiliation: Department of Pharmacy, Free University of Berlin, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Wischke
authors.forename: H-H
authors.initials: HH
authors.lastname: Borchert
mesh_terms: D000941:Antigens / Q000008:administration & dosage*; D003692:Delayed-Action Preparations; D016503:Drug Delivery Systems; D004655:Emulsions / Q000737:chemistry*; D016650:Fluorescein-5-isothiocyanate / Q000031:analogs & derivatives / Q000737:chemistry / Q000493:pharmacokinetics; D006016:Glycolates / Q000737:chemistry*; D019344:Lactic Acid; D010316:Particle Size; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011506:Proteins / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000493:pharmacokinetics; D013678:Technology, Pharmaceutical / Q000295:instrumentation / Q000379:methods*
chemical_list: D000941:Antigens; D003692:Delayed-Action Preparations; D004655:Emulsions; D006016:Glycolates; D011506:Proteins; C039217:fluorescein isothiocyanate bovine serum albumin; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D012710:Serum Albumin, Bovine; D019344:Lactic Acid; D016650:Fluorescein-5-isothiocyanate