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Host-guest complexes of the antituberculosis drugs pyrazinamide and isoniazid with cucurbit[7]uril

Wheate, N.J. and Vora, V. and Anthony, N.G. and McInnes, F.J. (2010) Host-guest complexes of the antituberculosis drugs pyrazinamide and isoniazid with cucurbit[7]uril. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 68 (3-4). pp. 359-367. ISSN 0923-0750

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Abstract

The potential use of cucurbit[7]uril (CB[7]) as an excipient in oral formulations for improved drug physical stability or for improved drug delivery was examined with the antituberculosis drugs pyrazinamide (pyrazine-2-carboxamide) and isoniazid (isonicotinohydrazide). Both drugs form 1:1 host-guest complexes with CB[7] as determined by H-1 nuclear magnetic resonance spectrometry, electrospray ionisation mass spectrometry and molecular modelling. Drug binding is stabilised by hydrophobic effects between the pyridine and pyrazine rings of isoniazid and pyrazinamide, respectively, to the inside cavity of the CB[7] macrocycle as well as hydrogen bonds between the hydrazide and amide groups of each drug to the CB[7] carbonyl portals. At pH 1.5, isoniazid binds CB[7] with a binding constant of 5.6 x 10(5) M-1, whilst pyrazinamide binds CB[7] at pH 7 with a much smaller binding constant (4.8 x 10(3) M-1). Finally, CB[7] prevents drug melting through encapsulation. Where previously pyrazinamide displays a typical melting point of 189 A degrees C and isoniazid 171 A degrees C, by differential scanning calorimetry, no melting or degradation at temperatures up to 280 A degrees C is observed for either drug once bound by CB[7].

Item type: Article
ID code: 26161
Keywords: tuberculosis, cucurbituril , pyrazinamide, isoniazid, Pharmacy and materia medica, Chemistry(all), Condensed Matter Physics
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
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Depositing user: Strathprints Administrator
Date Deposited: 13 Jun 2011 15:05
Last modified: 27 Mar 2014 09:01
URI: http://strathprints.strath.ac.uk/id/eprint/26161

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