Doxorubicin release from core-shell type nanoparticles of poly(DL-lactide-co-glycolide)-grafted dextran

  • Young -Il Jeong
  • Ki -Choon Choi
  • Chae -Eun Song
Articles Drug Efficacy


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 by1H 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≈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 a sa colonic drug carrier. In conclusion, size, morphology, and molecular structure of DexLG nanoparticles are available to consider as an oral drug targeting nanoparticles.

Key words

Doxorubicin Dextran Core-shell type nanoparticles Poly(d,l-lactide-co-glycolide) Biodegradability Colon delivery 


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Copyright information

© The Pharmaceutical Society of Korea 2006

Authors and Affiliations

  • Young -Il Jeong
    • 1
  • Ki -Choon Choi
    • 2
  • Chae -Eun Song
    • 3
  1. 1.The Research Institute of Medical SciencesChonnam National UniversityGwangjuKorea
  2. 2.Division of Endocrinology and Metabolism, Department of Internal Medicine, College of MedicineKorea UniversitySeoulKorea
  3. 3.Korea Institute of Natural Science Inc.JeonnamKorea

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