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Studies on coumestrol/beta-cyclodextrin association: Inclusion complex characterization.

Camila Franco1, Liege Schwingel, Ivana Lula

  • 1Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul. Av. Ipiranga, 2752, Porto Alegre 90.610-000, RS, Brazil.

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This study improved coumestrol solubility using beta-cyclodextrin complexation. The resulting inclusion complex enhances coumestrol

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Area of Science:

  • Phytochemistry
  • Materials Science
  • Drug Delivery

Background:

  • Coumestrol is a natural estrogenic and antioxidant compound.
  • Its poor solubility limits its applications.
  • Beta-cyclodextrin is a known host molecule for improving drug solubility.

Purpose of the Study:

  • To enhance the aqueous solubility of coumestrol.
  • To form an inclusion complex between coumestrol and beta-cyclodextrin.
  • To characterize the formed complex.

Main Methods:

  • Complexation of coumestrol with beta-cyclodextrin in aqueous media.
  • Freeze-drying of the complex.
  • Characterization using Scanning Electron Microscopy (SEM), proton Nuclear Magnetic Resonance ((1)H NMR), and molecular modeling.

Main Results:

  • The formation of a coumestrol-beta-cyclodextrin inclusion complex was confirmed.
  • Molecular modeling suggests the coumestrol B-ring is preferentially included in the beta-cyclodextrin cavity.
  • SEM and (1)H NMR provided evidence for the complex structure.

Conclusions:

  • Beta-cyclodextrin complexation effectively improves coumestrol's aqueous solubility.
  • The B-ring of coumestrol is likely involved in the inclusion complex formation.
  • This approach offers a promising strategy for coumestrol delivery and application.