Abstract
Comparative metabolomics of Leishmania species requires the simultaneous identification and quantification of a large number of intracellular metabolites. Here, we describe the optimisation of a comprehensive metabolite extraction protocol for Leishmania parasites and the subsequent optimisation of the analytical approach, consisting of hydrophilic interaction liquid chromatography coupled to LTQ-orbitrap mass spectrometry. The final optimised protocol starts with a rapid quenching of parasite cells to 0 °C, followed by a triplicate washing step in phosphate-buffered saline. The intracellular metabolome of 4 × 107 parasites is then extracted in cold chloroform/methanol/water 20/60/20 (v/v/v) for 1 h at 4 °C, resulting in both cell disruption and comprehensive metabolite dissolution. Our developed metabolomics platform can detect approximately 20% of the predicted Leishmania metabolome in a single experiment in positive and negative ionisation mode.
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Acknowledgements
This work was supported by the GeMInI initiative of the Institute of Tropical Medicine. Ruben t’Kindt was supported by a Research Foundation Flanders Grant for a long stay in Strathclyde. Rainer Breitling was supported by an NWO-Vidi fellowship.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00216-011-4796-7
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t’Kindt, R., Jankevics, A., Scheltema, R.A. et al. Towards an unbiased metabolic profiling of protozoan parasites: optimisation of a Leishmania sampling protocol for HILIC-orbitrap analysis. Anal Bioanal Chem 398, 2059–2069 (2010). https://doi.org/10.1007/s00216-010-4139-0
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DOI: https://doi.org/10.1007/s00216-010-4139-0