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Daidzein/cyclodextrin/hydrophilic polymer ternary systems.

Greice Stefani Borghetti1, Angela Pinheiro Pinto, Ivana Silva Lula

  • 1Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. greicefarm@yahoo.com.br

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Cyclodextrins significantly enhance daidzein water solubility, with hydroxypropyl-β-cyclodextrin (HPβ-CD) showing the greatest effect. Combining HPβ-CD with polyvinylpyrrolidone (PVP) further boosted daidzein solubility.

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Area of Science:

  • Pharmacology
  • Materials Science
  • Physical Chemistry

Background:

  • Daidzein, a soy isoflavone, exhibits poor water solubility, limiting its bioavailability.
  • Cyclodextrins (CDs) are widely used to improve the solubility of poorly soluble compounds.
  • Hydrophilic polymers can further enhance the solubilizing effect of CDs.

Purpose of the Study:

  • To investigate the impact of various cyclodextrins (β-CD, Mβ-CD, HPβ-CD) and hydrophilic polymers (HPMC, PVP) on daidzein aqueous solubility.
  • To characterize the formation and structure of daidzein-cyclodextrin inclusion complexes.
  • To evaluate the potential of ternary systems for further enhancing daidzein solubility.

Main Methods:

  • Phase-solubility studies were conducted to assess daidzein solubility in aqueous solutions with different CDs.
  • Freeze-dried daidzein/CD complexes were analyzed using scanning electron microscopy (SEM) for morphology.
  • Nuclear magnetic resonance (NMR) spectroscopy was employed to elucidate the spatial configuration of inclusion complexes.

Main Results:

  • All tested cyclodextrins significantly increased daidzein solubility: β-CD (5.7-fold), Mβ-CD (7.2-fold), and HPβ-CD (9.4-fold) at 6 mM.
  • SEM and NMR confirmed the formation of inclusion complexes, with daidzein molecules inserted into the CD cavity.
  • The addition of hydrophilic polymers like HPMC or PVP (1% w/w) to daidzein/CD complexes further improved daidzein solubility.

Conclusions:

  • HPβ-CD demonstrated the most effective solubilization of daidzein among the tested CDs.
  • The highest increase in daidzein solubility (12.7-fold) was achieved with a ternary system of daidzein/HPβ-CD/PVP.
  • These findings highlight the potential of cyclodextrin-polymer complexes for enhancing the solubility and potential bioavailability of daidzein.