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Sulfobutyl ether-alkyl ether mixed cyclodextrin derivatives with enhanced inclusion ability
Serena Tongiani1, Tetsuya Ozeki, Valentino J Stella
1Department of Pharmaceutical Chemistry, University of Kansas, 2095 Constant Avenue, Lawrence, Kansas 66047, USA.
Journal of Pharmaceutical Sciences
|May 2, 2009
Summary
New sulfobutyl ether-alkyl ether cyclodextrin derivatives show enhanced binding capacity for steroids and calcium channel blockers. Their efficacy is influenced by substitution degree and alkyl chain length, with some derivatives exhibiting potential for red blood cell hemolysis.
Area of Science:
- * Pharmaceutical Chemistry
- * Supramolecular Chemistry
- * Polymer Science
Background:
- * Cyclodextrins (CDs) are widely used in drug formulation to improve solubility and bioavailability.
- * Traditional cyclodextrins exhibit limited binding affinity for certain hydrophobic drugs, such as steroids and dihydropyridine calcium channel blockers.
- * Novel modified cyclodextrins are needed to enhance complexation capabilities for poorly soluble compounds.
Purpose of the Study:
- * To investigate the complexation ability of novel sulfobutyl ether-alkyl ether (SBE-AE-CD) mixed cyclodextrin derivatives.
- * To evaluate the impact of total degree of substitution (TDS) and alkyl chain length on binding capacity.
- * To assess the potential of these modified cyclodextrins to induce red blood cell hemolysis and correlate it with surface activity.
Main Methods:
- * Synthesis and characterization of SBE-AE-CD derivatives.
- * Spectroscopic and solubility studies to determine binding constants with steroids and calcium channel blockers.
- * Hemolysis assays using rabbit and human blood.
- * Surface activity measurements using a tensiometer.
Main Results:
- * SBE-AE-CDs demonstrated significantly improved binding capacity compared to standard sulfobutyl ether cyclodextrins (SBE-CDs).
- * Binding affinity was influenced by alkyl chain length and TDS, with intermediate substitution often being optimal.
- * Some SBE-AE-CD derivatives induced red blood cell hemolysis, correlating with increased surface activity in certain cases.
Conclusions:
- * SBE-AE-CDs represent a promising class of modified cyclodextrins with enhanced complexation capabilities for challenging drug molecules.
- * The structural modifications (TDS and alkyl chain length) critically influence both binding efficacy and potential hemolytic activity.
- * Further research is warranted to optimize SBE-AE-CD structures for specific pharmaceutical applications, balancing efficacy and safety.
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