title: Water-soluble betamethasone-loaded poly(lactide-co-glycolide) hollow microparticles as a sustained release dosage form.
abstract: In this study, betamethasone disodium phosphate-loaded microparticles were fabricated for sustained release using poly(lactide-co-glycolide) (PLGA) by spray drying and emulsion solvent evaporation/extraction techniques. Encapsulation efficiencies ranged from 59-80% using a water-in-oil-in-oil (W/O/O) double emulsion technique and more than 90% for a spray-drying method were obtained. This was a significant improvement compared to fabrication by a water-in-oil-in-water (W/O/W) double emulsion process, which had an encapsulation efficiency of less than 15%. Multiple-phase and biphasic release profiles were observed for microparticles of PLGA 50/50 and PLGA of higher lactide contents, respectively. The PLGA 50/50 hollow microparticles fabricated using the W/O/O double emulsion technique provided a sustained release of betamethasone disodium phosphate over 3 weeks.
authors.affiliation: Institute of Materials Research & Engineering, No.3, Research Link, Singapore 117602. cs-chaw@imre.org.sg
authors.forename: C S
authors.initials: CS
authors.lastname: Chaw
authors.forename: Y Y
authors.initials: YY
authors.lastname: Yang
authors.forename: I J
authors.initials: IJ
authors.lastname: Lim
authors.forename: T T
authors.initials: TT
authors.lastname: Phan
mesh_terms: D001623:Betamethasone / Q000008:administration & dosage* / Q000031:analogs & derivatives* / Q000737:chemistry; D003692:Delayed-Action Preparations; D004337:Drug Carriers / Q000737:chemistry; D004339:Drug Compounding / Q000379:methods*; D004655:Emulsions; D005938:Glucocorticoids / Q000008:administration & dosage* / Q000737:chemistry; D006801:Humans; D019344:Lactic Acid / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D012995:Solubility; D014867:Water
chemical_list: D003692:Delayed-Action Preparations; D004337:Drug Carriers; D004655:Emulsions; D005938:Glucocorticoids; D011108:Polymers; D014867:Water; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; C028994:betamethasone sodium phosphate; D001623:Betamethasone