title: Synthesis and Characterization of PLGA Shell Microcapsules Containing Aqueous Cores Prepared by Internal Phase Separation.
abstract: The preparation of microcapsules consisting of poly(D,L-lactide-co-glycolide) (PLGA) polymer shell and aqueous core is a clear challenge and hence has been rarely addressed in literature. Herein, aqueous core-PLGA shell microcapsules have been prepared by internal phase separation from acetone-water in oil emulsion. The resulting microcapsules exhibited mean particle size of 1.1 ± 0.39 μm (PDI = 0.35) with spherical surface morphology and internal poly-nuclear core morphology as indicated by scanning electron microscopy (SEM). The incorporation of water molecules into PLGA microcapsules was confirmed by differential scanning calorimetry (DSC). Aqueous core-PLGA shell microcapsules and the corresponding conventional PLGA microspheres were prepared and loaded with risedronate sodium as a model drug. Interestingly, aqueous core-PLGA shell microcapsules illustrated 2.5-fold increase in drug encapsulation in comparison to the classical PLGA microspheres (i.e., 31.6 vs. 12.7%), while exhibiting sustained release behavior following diffusion-controlled Higuchi model. The reported method could be extrapolated to encapsulate other water soluble drugs and hydrophilic macromolecules into PLGA microcapsules, which should overcome various drawbacks correlated with conventional PLGA microspheres in terms of drug loading and release.
authors.affiliation: Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, The University of Jordan, Amman, 11942, Jordan. s.abulateefeh@ju.edu.jo.
authors.forename: Samer R
authors.initials: SR
authors.lastname: Abulateefeh
authors.affiliation: Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, The University of Jordan, Amman, 11942, Jordan.
authors.forename: Alaaldin M
authors.initials: AM
authors.lastname: Alkilany
mesh_terms: D002152:Calorimetry, Differential Scanning / Q000379:methods; D002214:Capsules / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000737:chemistry; D004655:Emulsions / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008863:Microspheres; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D014867:Water / Q000737:chemistry*
chemical_list: D002214:Capsules; D003692:Delayed-Action Preparations; D004655:Emulsions; D014867:Water; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid
keywords: internal phase separation; microcapsules; microspheres; poly(D,L-lactide-co-glycolide); risedronate sodium