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Hyphenation of reverse-phase HPLC and ICP-MS for metabolite profiling—application to a novel antituberculosis compound as a case study

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Abstract

In this study, a high-performance liquid chromatography (HPLC) inductively coupled plasma (ICP) mass spectrometry (MS) method was developed intended for use in metabolism studies of bromine-containing drugs, administered to test animals (or test persons). As a case study, the method was applied to a new antituberculosis compound, the bromine-containing diarylquinoline R207910. A method has been proposed to overcome the incompatibilities between the high organic solvent content (45%CH3OH and 45% CH3CN) used in the reverse-phase liquid chromatography (LC) separation on one hand and the limitations of the ICP on the other hand. Therefore, several instrument modifications had to be made. For the introduction of the column effluent, a combination of a perfluoroalkoxy LC nebulizer with a PC3 Peltier-cooled inlet system (operated at 2 °C) was used. Additionally, the standard injector tube (internal diameter 2 mm) was replaced by an injector tube with an internal diameter of 1 mm and to avoid carbon build-up on the interface cones and the torch, the nebulizer gas was admixed with 6% v/v of oxygen. After optimization of the method, HPLC-ICP-MS was applied for metabolite profiling of faeces samples after dosing of 14C-radiolabelled R207910 to dogs and rats. To evaluate the method developed, the HPLC-ICP-MS results were compared with those of HPLC with UV spectrophotometric and 14C radiochemical detection. As the HPLC-ICP-MS method gave rise to a higher selectivity than HPLC with UV detection and to a better detection limit (5 ng R207910) than the method with radiochemical detection (65 ng R207910), it can be concluded that ICP-MS can be used as a good alternative to the more traditional detection methods, even when a mobile phase with high organic solvent content has to be used in the LC separation.

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Acknowledgements

L.I.L.B. is a Senior Research Assistant of the Fund for Scientific Research—Flanders (FWO-Vlaanderen). F.V. acknowledges the FWO-Vlaanderen for financial support (research project G.0669.06).

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Correspondence to Frank Vanhaecke.

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Balcaen, L.I.L., De Samber, B., De Wolf, K. et al. Hyphenation of reverse-phase HPLC and ICP-MS for metabolite profiling—application to a novel antituberculosis compound as a case study. Anal Bioanal Chem 389, 777–786 (2007). https://doi.org/10.1007/s00216-007-1303-2

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  • DOI: https://doi.org/10.1007/s00216-007-1303-2

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