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Related Experiment Videos

Beta-cyclodextrin/steroid complexation: effect of steroid structure on association equilibria.

F Y Liu1, D O Kildsig, A K Mitra

  • 1Department of Industrial and Physical Pharmacy, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, Indiana 47907.

Pharmaceutical Research
|August 1, 1990
PubMed
Summary

Beta-cyclodextrin (beta-CyD) forms 1:2 inclusion complexes with steroids like progesterone and testosterone. Complexation involves steroid inclusion into beta-CyD cavities, influencing drug solubility and stability.

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Area of Science:

  • Supramolecular Chemistry
  • Pharmaceutical Sciences
  • Physical Chemistry

Background:

  • Beta-cyclodextrin (beta-CyD) is a cyclic oligosaccharide known for its ability to form inclusion complexes with various guest molecules.
  • Steroids are a class of organic compounds with important physiological functions and therapeutic applications.
  • Understanding the molecular interactions between beta-CyD and steroids is crucial for developing novel drug delivery systems.

Purpose of the Study:

  • To investigate the molecular associations between beta-cyclodextrin and four specific steroids: cortisone, hydrocortisone, progesterone, and testosterone.
  • To determine the stoichiometry, stability constants, and complexation mechanism of these steroid-beta-CyD complexes.
  • To evaluate the impact of complexation on the aqueous solubility of the studied steroids.

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Main Methods:

  • Phase-solubility studies were conducted to assess complex formation and solubility.
  • Spectroscopic techniques were employed to gain insights into the molecular interactions.
  • A mathematical model was developed to calculate apparent stability constants.
  • The stoichiometry of the complexes was determined to be 1:2 (drug:beta-CyD).

Main Results:

  • Phase solubility diagrams indicated B-type behavior, characteristic of soluble complexes.
  • The association constants followed the order: progesterone > cortisone > testosterone > hydrocortisone.
  • Aqueous solubilities of the complexes were ordered as: hydrocortisone > cortisone > testosterone > progesterone.
  • Cortisone exhibited anomalous behavior in the complexation process.

Conclusions:

  • A mechanism of complexation was proposed, involving the inclusion of the steroid's cyclopentane ring into the beta-CyD cavity, followed by association with a second beta-CyD molecule.
  • The study provides valuable data on the thermodynamics and stoichiometry of steroid-beta-CyD interactions.
  • These findings can guide the formulation of steroid-based drug delivery systems with enhanced properties.