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Self-assembled nanoparticles of glycol chitosan – Ergocalciferol succinate conjugate, for controlled release

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  • Javier Perez Quinones, Center of Natural Products, Faculty of Chemistry, University of Havana, Cuba
  • Kurt Vesterager Gothelf
  • Jørgen Kjems
  • Angeles Maria Hevas Caballero, Instituto de Estudios Biofuncionales/Dpto Química Física II, Facultad de Farmacia, Universidad Complutense de Madrid, Spanien
  • Claudia Schmidt, Department of Chemistry, University of Paderborn, Tyskland
  • Carlos Peniche Covas, Center of Biomaterials, University of Havana, Cuba
Glycol chitosan was linked to vitamin D2 hemisuccinate (ergocalciferol hemisuccinate) for controlled release through water-soluble carbodiimide activation. The resulting conjugate formed self-assembled nanoparticles in aqueous solution with particle size of 279 nm and ergocalciferol hemisuccinate content of 8.4% (w/w). Almost spherical 50–90 nm nanoparticles were observed by scanning and transmission electron microscopy upon drying. Drug linking to glycol chitosan was confirmed by FTIR spectroscopy and proton NMR. Particles were also characterized by differential scanning calorimetry and wide-angle X-ray diffraction studies. In vitro vitamin D2 release studies performed in water at acid pH indicated a drug release dependence on the solution acidity. Almost constant release rate was observed during the first 8 h. These results indicate that the obtained nanoparticles could be good candidates for vitamin D2 release to animals and humans.
TidsskriftCarbohydrate Polymers
Sider (fra-til)1373-1377
Antal sider5
StatusUdgivet - 16 maj 2012

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