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

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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 1H 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 × 105 M−1, whilst pyrazinamide binds CB[7] at pH 7 with a much smaller binding constant (4.8 × 103 M−1). Finally, CB[7] prevents drug melting through encapsulation. Where previously pyrazinamide displays a typical melting point of 189 °C and isoniazid 171 °C, by differential scanning calorimetry, no melting or degradation at temperatures up to 280 °C is observed for either drug once bound by CB[7].

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  1. Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, John Arbuthnott Building, 27 Taylor Street, Glasgow, G4 0NR, UK

    Nial J. Wheate, Virendra Vora, Nahoum G. Anthony & Fiona J. McInnes

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Wheate, N.J., Vora, V., Anthony, N.G. et al. Host–guest complexes of the antituberculosis drugs pyrazinamide and isoniazid with cucurbit[7]uril. J Incl Phenom Macrocycl Chem 68, 359–367 (2010). https://doi.org/10.1007/s10847-010-9795-3

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