title: Effects of solvent selection and fabrication method on the characteristics of biodegradable poly(lactide-co-glycolide) microspheres containing ovalbumin.
abstract: To demonstrate the effect of formulation conditions on the controlled release of protein from poly(lactide-co-glycolide) (PLGA) microspheres for use as a parenteral drug carrier, ovalbumin (OVA) microspheres were prepared using the W/O/W multiple emulsion solvent evaporation and extraction method. Methylene chloride or ethyl acetate was applied as an organic phase and poly(vinyl alcohol) as a secondary emulsion stabilizer. Low loading efficiencies of less than 20% were observed and the in vitro release of OVA showed a burst effect in all batches of different microspheres, followed by a gradual release over the next 6 weeks. Formulation processes affected the size and morphology, drug content, and the controlled release of OVA from PLGA microspheres.
authors.affiliation: Department of Pharmaceutics, College of Pharmacy, Chung-Ang University, Seoul, Korea.
authors.forename: S W
authors.initials: SW
authors.lastname: Cho
authors.forename: S H
authors.initials: SH
authors.lastname: Song
authors.forename: Y W
authors.initials: YW
authors.lastname: Choi
mesh_terms: D019344:Lactic Acid / Q000008:administration & dosage*; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010047:Ovalbumin / Q000008:administration & dosage*; D011100:Polyglycolic Acid / Q000008:administration & dosage*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000008:administration & dosage*
chemical_list: D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D010047:Ovalbumin