Abstract
A capillary electrophoresis (CE) method hyphenated with tandem mass spectrometry (triple quadrupole, QqQ MS) was developed for the simultaneous determination of six selected drugs used in Crohn’s disease treatment, namely, azathioprine, 6-thioguanine, 6-mercaptopurine, mesalazine, prednisone, and allopurinol. A 10 mM ammonium acetate adjusted at pH 9 by 3% ammonium hydroxide and including a 5% methanol addition was used as an optimum background electrolyte (BGE). The optimum BGE provided both the baseline electrophoretic separation of the drugs and highly compatible connection of CE to the electro-spray ionization (ESI) interface. The optimized working conditions were favorable for the selective and sensitive QqQ MS detection of the separated compounds according to their mass-to-charge (m/z) ratios. The proposed method was validated in terms of precision (RSDs for the repeatability of migration times and peak areas of the analyzed drugs were less than 1.66 and 6.06%, respectively), linearity (determination coefficient ranged in the interval of 0.9987–0.9995), limits of quantitation (sub µg mL−1 levels), and accuracy (mean recoveries of all the analytes in pharmaceutical matrix ranged in the interval of 98.23–101.2%). The CE-ESI-QqQ MS method is fast, simple, selective, precise, and accurate, and was successfully applied to a highly reliable determination of the targeted drugs (for the treatment of inflammatory bowel disease, IBD) in commercial pharmaceuticals (tablet dosage forms).
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Acknowledgements
This work was supported by the Projects VEGA 1/0873/15, KEGA 022UK-4/2015, and APVV-15-0585 and carried out in the Toxicological and Antidoping Center at the Faculty of Pharmacy Comenius University in Bratislava.
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Published in the topical collection Advances in Chromatography and Electrophoresis & Chiranal 2016 with guest editor Jan Petr.
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Maráková, K., Piešťanský, J. & Mikuš, P. Determination of Drugs for Crohn’s Disease Treatment in Pharmaceuticals by Capillary Electrophoresis Hyphenated with Tandem Mass Spectrometry. Chromatographia 80, 537–546 (2017). https://doi.org/10.1007/s10337-016-3213-y
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DOI: https://doi.org/10.1007/s10337-016-3213-y