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Cyclodextrin solubilization of ETH-615, a zwitterionic drug
1Department of Pharmacy, University of Iceland, Reykjavik, Iceland.
Drug Development and Industrial Pharmacy
|January 7, 1999
Summary
Zwitterionic drug solubility can be improved using cyclodextrins, particularly uncharged derivatives. Polymers and ion-pairing agents further enhance the solubilization of ETH-615, a zwitterionic drug.
Area of Science:
- Pharmaceutical Sciences
- Physical Chemistry
Background:
- Zwitterionic drugs often exhibit poor aqueous solubility, limiting their therapeutic applications.
- Cyclodextrins are known excipients for enhancing drug solubility through complexation.
Purpose of the Study:
- To investigate cyclodextrin complexation effects on the solubility of the zwitterionic drug ETH-615.
- To evaluate the influence of cyclodextrin charge, polymers, and ion-pairing agents on ETH-615 solubilization.
Main Methods:
- Tested five beta-cyclodextrin derivatives (anionic, uncharged, cationic) for their effect on ETH-615 solubility.
- Assessed the impact of water-soluble polymers and ion-pairing agents on cyclodextrin-mediated solubilization.
Main Results:
- Uncharged cyclodextrins demonstrated a significantly greater solubilizing effect on ETH-615 compared to charged derivatives.
- ETH-615-cyclodextrin complex stability constants were low due to the drug's polar zwitterionic nature.
- Solubilization of ETH-615 was notably enhanced by co-administration with polymers and ion-pairing agents.
Conclusions:
- Uncharged cyclodextrins are more effective for solubilizing zwitterionic drugs like ETH-615.
- Combinations of cyclodextrins with polymers or ion-pairing agents can improve the solubilization of challenging zwitterionic compounds.