title: Doxorubicin release from core-shell type nanoparticles of poly(DL-lactide-co-glycolide)-grafted dextran.
abstract: In this study, we prepared core-shell type nanoparticles of a poly(DL-lactide-co-glycolide) (PLGA) grafted-dextran (DexLG) copolymer with varying graft ratio of PLGA. The synthesis of the DexLG copolymer was confirmed by 1H nuclear magnetic resonance (NMR) spectroscopy. The DexLG copolymer was able to form nanoparticles in water by self-aggregating process, and their particle size was around 50 nm approximately 300 nm according to the graft ratio of PLGA. Morphological observations using a transmission electron microscope (TEM) showed that the nanoparticles of the DexLG copolymer have uniformly spherical shapes. From fluorescence probe study using pyrene as a hydrophobic probe, critical association concentration (CAC) values determined from the fluorescence excitation spectra were increased as increase of DS of PLGA. 1H-NMR spectroscopy using D2O and DMSO approved that DexLG nanoparticles have core-shell structure, i.e. hydrophobic block PLGA consisted inner-core as a drug-incorporating domain and dextran consisted as a hydrated outershell. Drug release rate from DexLG nano-particles became faster in the presence of dextranase in spite of the release rate not being significantly changed at high graft ratio of PLGA. Core-shell type nanoparticles of DexLG copolymer can be used as a colonic drug carrier. In conclusion, size, morphology, and molecular structure of DexLG nanoparticles are available to consider as an oral drug targeting nanoparticles.
authors.affiliation: The Research Institute of Medical Sciences, Chonnam National University, Gwangju, Korea.
authors.forename: Young-Il
authors.initials: YI
authors.lastname: Jeong
authors.forename: Ki-Choon
authors.initials: KC
authors.lastname: Choi
authors.forename: Chae-Eun
authors.initials: CE
authors.lastname: Song
mesh_terms: D000284:Administration, Oral; D003911:Dextrans / Q000737:chemistry*; D004317:Doxorubicin / Q000008:administration & dosage / Q000737:chemistry*; D004337:Drug Carriers; D019344:Lactic Acid / Q000737:chemistry*; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence
chemical_list: D003911:Dextrans; D004337:Drug Carriers; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D004317:Doxorubicin