Abstract
The density, viscosity and conductivity of binary mixtures of the front line antitubercular drug isoniazid (INH), in aqueous solution and dimethylsulfoxide (DMSO) solution, were determined at various temperatures (25, 37 and 55 °C) up to 0.3 mol⋅L−1 of INH. The apparent molar volumes were calculated from the density data. In the INH + water system the apparent molar volume of INH changed smoothly, whereas in the INH + DMSO system it passes through a maximum. Also, both systems showed pronounced maxima in their viscosity and conductivity isotherms. In addition, UV–Vis, FT-IR and 1H NMR spectroscopy were performed on the solutions. On the basis of this data, the predominant molecular interactions occurring between INH and water and between INH and DMSO were found to be hydrogen bonds. Furthermore, the susceptibility profile of DMSO, INH and its combination was studied against M. tuberculosis H37Rv and the minimum inhibitory concentration (MIC) determined. The results suggest a synergistic effect of INH at sub-MIC concentrations and DMSO.
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This work was partly supported by the Armenian State Committee of Science. S.B. acknowledges a New Investigators Research Grant from Medical Research Council, UK (grant G0801956).
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Appendices
Appendix A: Densities, Viscosities, and Conductivities of the INH + H2O and INH + DMSO systems
Appendix B: In Vitro Susceptibility of M. tuberculosis in the Presence of INH–DMSO
M. tuberculosis H37Rv was grown at 37 °C as a standing culture in 30 mL universals in Middlebrook 7H9 broth medium supplemented with 10 % (v/v) albumin–dextrose–catalase (ADC; Difco), glycerol (0.2 % v/v) and 0.05 % Tween-80, until reaching a turbidity close to McFarland standard 1. The effect of DMSO, INH and the combination of the two (DMSO–INH) on the growth of M. tuberculosis was tested using spot culture growth inhibition assay [13]. Briefly, INH dissolved in sterile distilled water and DMSO was mixed with 5 mL of Middlebrook 7H10 agar medium, supplemented with 10 % (v/v) oleic acid–albumin–dextrose–catalase (OADC, Difco) and glycerol (0.5 % v/v) in a six well plate. Then, 10 μL of M. tuberculosis H37Rv cell suspension (105 cells⋅mL−1) was spotted in the center of each well. The plates were sealed and incubated at 37 °C for 2 weeks. Following incubation the plates were photographed using a digital camera.
The effect of DMSO in M. tuberculosis H37Rv viability was evaluated using the spot culture inhibition assay [13]. As shown in Fig. 11A, DMSO has nearly inhibited the growth of M. tuberculosis at 5 %. Previous reports have shown that DMSO at 5 % is able to stop the growth of M. tuberculosis [3]. In addition, when DMSO was tested against M. bovis BCG, the growth was completely inhibited at 3 % DMSO (Fig. 12). Using the same assay, the MIC of INH against M. tuberculosis H37Rv was determined to be 0.05 mg⋅L−1 (Fig. 11B), a value in agreement with previously published data [12]. M. tuberculosis cells were able to grow at 0.01 mg⋅L−1 INH; however, in the presence of different concentrations of DMSO, the susceptibility pattern changed. The combination of 0.01 mg⋅L−1 of INH and 0.5 % DMSO were able to inhibit the growth of M. tuberculosis (Fig. 11C). Neither INH alone at 0.01 mg⋅L−1 nor DMSO at 0.5 % were able to kill the bacteria. Therefore, we conclude that these two compounds have a synergistic relation between them making them more potent in combination. Further research should prove whether DMSO is able to act synergistically with other antimycobacterials, and whether the presence of DMSO sensitizes or modifies the cell wall of mycobacteria thereby making it more susceptible to antimicrobial agents.
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Markarian, S.A., Evangelopoulos, D., Harutyunyan, L.R. et al. The Properties of Solutions of Isoniazid in Water and Dimethylsulfoxide. J Solution Chem 41, 1462–1476 (2012). https://doi.org/10.1007/s10953-012-9883-7
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DOI: https://doi.org/10.1007/s10953-012-9883-7