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Isoflavone aglycons-sulfobutyl ether-β-cyclodextrin inclusion complexes: in solution and solid state studies

  • Rosanna Stancanelli
  • Valentina Venuti
  • A. Arigò
  • M. L. Calabrò
  • C. Cannavà
  • V. Crupi
  • D. Majolino
  • S. Tommasini
  • C. A. Ventura
Original Article

Abstract

The effect of a polyanionic variably substituted sulfobutyl ether-β-cyclodextrin (SBE-β-CyD), complexation on the UV absorption of genistein (Gen) and daidzein (Dai) was studied in pure water. A phase solubility study was performed, according to the method reported by Higuchi and Connors, to evaluate the changes of isoflavones in the complexation state and type-AL solubility diagrams for both isoflavones were obtained suggesting that they form complexes with 1:1 molar ratio. These results were confirmed by Job’s plot method. Complexation strongly increases the water solubility of isoflavones. The in vitro dissolution of isoflavones entrapped into SBE-β-CyD significantly surpassed that of the free isoflavones (over 90 % of the loaded Gen and Dai dissolved in 15 and 30 min, respectively). Finally, 1:1 molar ratio solid complexes were prepared by the kneading method and characterized in solid state by FTIR-ATR spectroscopy, with particular regard to O–H and C=O stretching vibrations, achieving structural information on the modifications induced by complexation on the H-bond scheme, also by applying band decomposition and curve-fit.

Keywords

Sulfobutyl ether-β-cyclodextrin Isoflavones UV–Vis spectroscopy Solubility measurements Dissolution rate FTIR-ATR spectroscopy 

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Rosanna Stancanelli
    • 1
  • Valentina Venuti
    • 2
  • A. Arigò
    • 1
  • M. L. Calabrò
    • 1
  • C. Cannavà
    • 3
  • V. Crupi
    • 2
  • D. Majolino
    • 2
  • S. Tommasini
    • 1
  • C. A. Ventura
    • 1
  1. 1.Dipartimento di Scienze del Farmaco e Prodotti per la SaluteUniversità di MessinaMessinaItaly
  2. 2.Dipartimento di Fisica e di Scienze della TerraUniversità di MessinaMessinaItaly
  3. 3.Dipartimento di Patologia UmanaUniversità di MessinaMessinaItaly

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