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Influence of lipophilicity on drug-cyclodextrin interactions: A calorimetric study

Influence of lipophilicity on drug-cyclodextrin interactions: A calorimetric study

Waters, Laura J., Bedford, Susan, Parkes, Gareth M.B. and Mitchell, J.C. ORCID: 0000-0003-2945-3292 (2010) Influence of lipophilicity on drug-cyclodextrin interactions: A calorimetric study. Thermochimica Acta, 511 (1-2). pp. 102-106. ISSN 0040-6031 (doi:10.1016/j.tca.2010.07.031)

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Abstract

This study presents a systematic investigation of the interaction of three functionally related drugs, ibuprofen, ketoprofen and flurbiprofen, with two distinct forms of cyclodextrin at three specific temperatures, 298, 303 and 310K using isothermal titration calorimetry (ITC). Although all three pharmaceutical compounds have similar pKa values, they exhibit widely differing lipophilicities. While previous authors have presented data regarding the binding of flurbiprofen and ibuprofen with β-cyclodextrin, this is the first report of the interaction of all three drug substances with β-cyclodextrin and 2-(hydroxypropyl)-β-cyclodextrin at controlled pH and temperature. For all scenarios, the associated changes in Gibbs free energy, enthalpy and entropy are presented alongside the stoichiometry and binding constants concerned. In all cases the binding was found to occur at a 1:1 ratio with an associated negative enthalpy and Gibbs free energy with the formation of the complex enthalpically, rather than entropically driven. The data further demonstrates a clear relationship between the thermodynamic behaviour and log P of the drug molecules. This work confirms the suitability of ITC to determine thermodynamic data for drug cyclodextrin complex formations and provides an insight into the selection of appropriate cyclodextrins for bespoke pharmaceutical formulations.

Item Type: Article
Additional Information: [1] Available online 6th August 2010.
Uncontrolled Keywords: ITC, Cyclodextrin complex, drug, thermodynamic, isothermal, log P, NSAID
Subjects: R Medicine > RM Therapeutics. Pharmacology
R Medicine > RS Pharmacy and materia medica
Pre-2014 Departments: School of Science
School of Science > Medway Sciences Research Group
Related URLs:
Last Modified: 14 Oct 2016 09:11
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/4204

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