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Combined Effects of Drugs: Synergism01:27

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Related Experiment Video

Updated: Jul 2, 2026

Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
05:08

Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid

Published on: September 20, 2017

gammaCD/HPgammaCD: synergistic solubilization.

Phatsawee Jansook1, Thorsteinn Loftsson

  • 1Faculty of Pharmaceutical Sciences, University of Iceland, Reykjavik, Iceland.

International Journal of Pharmaceutics
|August 12, 2008
PubMed
Summary

Gamma-cyclodextrin (gammaCD) has a favorable toxicological profile but poor solubility. Adding 2-hydroxypropyl-gamma-cyclodextrin (HPgammaCD) creates synergistic effects, enhancing solubilization and reducing turbidity for gammaCD applications.

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Last Updated: Jul 2, 2026

Solubility of Hydrophobic Compounds in Aqueous Solution Using Combinations of Self-assembling Peptide and Amino Acid
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Area of Science:

  • Pharmaceutical Sciences
  • Supramolecular Chemistry

Background:

  • Natural gamma-cyclodextrin (gammaCD) exhibits a favorable toxicological profile due to its resistance to enzymatic digestion by amylase.
  • Unlike alpha- and beta-cyclodextrins, gammaCD's utility is limited by low solubilizing capacity and solution turbidity.
  • 2-hydroxypropyl-gamma-cyclodextrin (HPgammaCD) is a derivative designed to improve cyclodextrin properties.

Purpose of the Study:

  • To investigate the impact of combining gammaCD with HPgammaCD on solubilization and solution properties.
  • To determine if mixing gammaCD with HPgammaCD yields synergistic effects, surpassing additive contributions.
  • To evaluate the potential of HPgammaCD as a solubilizing enhancer for gammaCD.

Main Methods:

  • Preparation of aqueous solutions containing mixtures of gammaCD and HPgammaCD at various ratios.
  • Assessment of the solubilizing efficacy of these mixtures for model drugs like dexamethasone and hydrocortisone.
  • Turbidity measurements of the prepared cyclodextrin solutions.
  • Comparative analysis of the observed solubilization with predicted additive effects.

Main Results:

  • An 80:20 mixture of gammaCD and HPgammaCD demonstrated a synergistic increase in solubilizing effectiveness, exceeding 50% more than expected from individual components.
  • The addition of HPgammaCD significantly reduced the turbidity of gammaCD solutions.
  • Mixing alpha- or beta-cyclodextrins with their soluble derivatives resulted only in additive solubilization effects, unlike the gammaCD/HPgammaCD system.

Conclusions:

  • The combination of gammaCD and HPgammaCD exhibits a synergistic effect, significantly enhancing drug solubilization and improving solution clarity.
  • This synergistic interaction presents a promising strategy for overcoming the limitations of gammaCD, broadening its pharmaceutical applications.
  • HPgammaCD acts as an effective enhancer for gammaCD, offering a superior approach compared to combining other cyclodextrin types with their derivatives.