title: Stereological analysis of the poly-(DL-lactide-co-glycolide) submicron sphere prepared by solvent/non-solvent chemical methods and centrifugal processing.
abstract: Fine particles made of poly(lactide-co-glycolide) (DLPLG) are excellent candidates for controlled release of delivering drugs and genes, because of their degradable nature. The preparation of DLPLG submicron spheres poses serious challenges that are not necessarily present when preparing macroparticles. In the present paper, DLPLG powder is produced with chemical method using solvent/non-solvent systems with subsequent centrifugation of the solution. The samples were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM) and stereological analysis. By changing the aging time with non-solvent and time and velocity of the centrifugal processing, it is possible to influence on the morphology and uniformity of the copolymer particles. Powder of the series with short aging time with non-solvent and longest time and velocity of the centrifugal processing has smallest particles and highest uniformity, where mean particles sizes were between 150 nm and 230 nm depending on which stereological parameters are considered (D(max), maximal diameters, feret X or feret Y).
authors.affiliation: Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade 11000, Serbia.
authors.forename: M
authors.initials: M
authors.lastname: Stevanovic
authors.forename: N
authors.initials: N
authors.lastname: Ignjatovic
authors.forename: B
authors.initials: B
authors.lastname: Jordovic
authors.forename: D
authors.initials: D
authors.lastname: Uskokovic
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002498:Centrifugation / Q000379:methods*; D003460:Crystallization / Q000379:methods*; D019344:Lactic Acid / Q000737:chemistry*; D008422:Materials Testing; D008854:Microscopy, Electron; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D011108:Polymers; D012997:Solvents; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid