Abstract
A simple, sensitive and rapid ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) method was developed and validated for the quantification of mitragynine in rat plasma using amitriptyline hydrochloride as an internal standard. Sample preparation involved a one-step liquid–liquid extraction using methyl t-butyl ether. Mitragynine was separated on an Acquity UPLC™ BEH HILIC column using isocratic elution with a mobile phase of 10 mM ammonium formate buffer containing 0.1% formic acid:acetonitrile (15:85, v/v). At a flow rate of 0.2 mL min−1, the retention time of mitragynine was found to be 1.3 min. Ionization was performed in the positive ion electrospray mode. The selected mass-to-charge (m/z) ratio transition of mitragynine ion [M + H]+ used in the selected ion recording (SIR) was 399.1. The calibration curve was found to be linear over a concentration range of 1–5,000 ng mL−1 (r = 0.999) with a lower limit of quantification (LLOQ) of 1 ng mL−1. Intra- and inter-day assay variations were found to be less than 15%. The extraction recoveries ranged from 85–93% at the three concentrations (2, 400 and 4,000 ng mL−1) in rat plasma. This method was successfully used to quantify mitragynine in rat plasma following intravenous administration of the compound.
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The project described was supported by grant number P20RR021929 from the National Center for Research Resources. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Center for Research Resources or the National Institutes of Health. This investigation was conducted in a facility constructed with support from research facilities improvement program C06 RR-14503-01 from the National Center for Research Resources.
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Vuppala, P.K., Boddu, S.P., Furr, E.B. et al. Simple, Sensitive, High-Throughput Method for the Quantification of Mitragynine in Rat Plasma Using UPLC-MS and Its Application to an Intravenous Pharmacokinetic Study. Chromatographia 74, 703–710 (2011). https://doi.org/10.1007/s10337-011-2128-x
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DOI: https://doi.org/10.1007/s10337-011-2128-x