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Stability study of nanoparticles of poly(epsilon-caprolactone), poly(D,L-lactide) and poly(D,L-lactide-co-glycolide). 1996

D Lemoine, and C Francois, and F Kedzierewicz, and V Preat, and M Hoffman, and P Maincent
Université catholique de Louvain, Unité de Pharmacie Galénique, Brussels, Belgium.

The objective was to evaluate the stability of nanoparticles prepared with poly(epsilon-caprolactone), poly(D,L-lactide) and poly(D,L-lactide-co-glycolide) polymers and stored at different temperatures and in different media. The stability parameters studied were molecular weight and crystallinity of the polymer, nanoparticle size and pH. The results show that the stability of polymeric nanoparticles depends on (i) the type of polymers with the following increasing order of polymer stability: PLA25GA50 < PLA37.5GA25 < PLA50 = PCL, (ii) the storage temperature: PCL and PLA50 nanoparticles can be kept at 4 degrees C and RT during one year, while PLA37.5GA25 and PLA25GA50 nanoparticles have to be stored at 4 degrees C, and (iii) the storage conditions: buffering or freeze-drying nanoparticles improves stability.

UI MeSH Term Description Entries
D008855 Microscopy, Electron, Scanning Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY. Scanning Electron Microscopy,Electron Scanning Microscopy,Electron Microscopies, Scanning,Electron Microscopy, Scanning,Electron Scanning Microscopies,Microscopies, Electron Scanning,Microscopies, Scanning Electron,Microscopy, Electron Scanning,Microscopy, Scanning Electron,Scanning Electron Microscopies,Scanning Microscopies, Electron,Scanning Microscopy, Electron
D011091 Polyesters Polymers of organic acids and alcohols, with ester linkages--usually polyethylene terephthalate; can be cured into hard plastic, films or tapes, or fibers which can be woven into fabrics, meshes or velours. Polyester
D011100 Polyglycolic Acid A biocompatible polymer used as a surgical suture material. Polyglycolide,Biofix,Dexon (Polyester),Dexon-S,Dexon S,DexonS
D011108 Polymers Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS). Polymer
D002152 Calorimetry, Differential Scanning Differential thermal analysis in which the sample compartment of the apparatus is a differential calorimeter, allowing an exact measure of the heat of transition independent of the specific heat, thermal conductivity, and other variables of the sample. Differential Thermal Analysis, Calorimetric,Calorimetric Differential Thermal Analysis,Differential Scanning Calorimetry,Scanning Calorimetry, Differential
D004355 Drug Stability The chemical and physical integrity of a pharmaceutical product. Drug Shelf Life,Drugs Shelf Lives,Shelf Life, Drugs,Drug Stabilities,Drugs Shelf Life,Drugs Shelf Live,Life, Drugs Shelf,Shelf Life, Drug,Shelf Live, Drugs,Shelf Lives, Drugs
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000077182 Polylactic Acid-Polyglycolic Acid Copolymer A co-polymer that consists of varying ratios of polylactic acid and polyglycolic acid. It is used as a matrix for drug delivery and for BONE REGENERATION. PLGA Acid,LactoSorb,PL-PG Copolymer,PLG Polymer,PLGA Compound,Poly (D,L-lactic-co-glycolic Acid),Poly (Lactic-co-glycolic Acid) -,Poly(D,L-lactide-co-glycolide),Poly(DL-lactide-co-glycolic Acid),Poly(Glycolide-co-lactide),Poly(L-lactide)-co-glycolide,Poly(Lactic-co-glycolic Acid),Poly-L-lactic-polyglycolic Acid,Polylactic-co-glycolic Acid Copolymer,RG 502,Acid, PLGA,Acids, PLGA,Copolymer, PL-PG,Copolymer, Polylactic-co-glycolic Acid,Copolymers, PL-PG,Copolymers, Polylactic-co-glycolic Acid,PL PG Copolymer,PL-PG Copolymers,PLG Polymers,PLGA Acids,PLGA Compounds,Poly L lactic polyglycolic Acid,Poly-L-lactic-polyglycolic Acids,Polylactic Acid Polyglycolic Acid Copolymer,Polylactic co glycolic Acid Copolymer,Polylactic-co-glycolic Acid Copolymers,Polymer, PLG,Polymers, PLG
D001704 Biopolymers Polymers synthesized by living organisms. They play a role in the formation of macromolecular structures and are synthesized via the covalent linkage of biological molecules, especially AMINO ACIDS; NUCLEOTIDES; and CARBOHYDRATES. Bioplastics,Bioplastic,Biopolymer
D012542 Scattering, Radiation The diversion of RADIATION (thermal, electromagnetic, or nuclear) from its original path as a result of interactions or collisions with atoms, molecules, or larger particles in the atmosphere or other media. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) Radiation Scattering,Radiation Scatterings,Scatterings, Radiation

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