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Isothermal Titration Calorimetry for Measuring Macromolecule-Ligand Affinity
Published on: September 7, 2011
Sertaconazole/hydroxypropyl-beta-cyclodextrin complexation: isothermal titration calorimetry and solubility
Ana I Rodriguez-Perez1, Carmen Rodriguez-Tenreiro, Carmen Alvarez-Lorenzo
1Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Spain.
Hydroxypropyl-beta-cyclodextrin (HP-beta-CD) significantly enhances sertaconazole (SN) solubility and dissolution rates, particularly at acidic pH. This complexation offers a promising approach for improving drug delivery systems.
Area of Science:
- Pharmaceutical Sciences
- Physical Chemistry
Background:
- Sertaconazole (SN) is an antifungal agent with limited aqueous solubility.
- Improving drug solubility and dissolution is crucial for effective drug delivery.
Purpose of the Study:
- To investigate the complexation of sertaconazole (SN) with hydroxypropyl-beta-cyclodextrin (HP-beta-CD).
- To evaluate the impact of this complexation on SN solubility and dissolution characteristics at different pH values.
Main Methods:
- Phase-solubility studies and isothermal titration calorimetry (ITC) in aqueous medium.
- Solid-state characterization using differential scanning calorimetry (DSC), Raman spectroscopy, and X-ray diffractometry.
- Preparation and evaluation of drug compacts from freeze-dried complexes and physical blends.
Main Results:
- Strongest interaction and highest solubility enhancement (up to 116-fold) observed at pH 1.2, forming 1:1 complexes.
- At pH 5.8 and 7.4, 1:2 stoichiometry increased, with moderate solubility enhancement.
- Freeze-dried complexes significantly improved SN solubility and dissolution rates compared to pure drug or physical blends.
Conclusions:
- HP-beta-CD effectively forms complexes with SN, with stoichiometry and efficacy dependent on pH.
- Complexation with HP-beta-CD is a viable strategy to enhance sertaconazole solubility and dissolution.
- ITC is a valuable tool for rapid screening of cyclodextrin complexation potential.
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