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UPLC-MS/MS Analysis of Methotrexate in Human Plasma and Comparison with the Fluorescence Polarization Immunoassay

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Abstract

Methotrexate (MTX) plasma concentration is routinely monitored to guide the dosage regimen of rescue drugs. This study aims to develop and validate an ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method for plasma MTX analysis, and to establish its agreement with the fluorescence polarization immunoassay (FPIA) in patients with high-dose MTX therapy. Separation was achieved by gradient elution with methanol and water (0.05% formic acid) at 40°C with a run time of 3 min. The intra- and inter-day inaccuracy and imprecision of the UPLC-MS/MS method were -4.25 to 3.1 and less than 7.63%, respectively. The IS-normalized recovery and matrix effect were 87.05 to 92.81 and 124.43 to 134.57%. The correlation coefficients between UPLC-MS/MS and FPIA were greater than 0.98. The UPLC-MS/MS method was in agreement with the FPIA at high levels of MTX (1.0 - 100 μmol/L), but not at low levels (0.01 - 1.0 μmol/L). Further studies are warranted to confirm these results.

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Acknowledgments

Thanks are given to our patients and our whole team. The authors would like to acknowledge Drs. Jiawang Liu, Ming Zhao and Shiqi Peng, College of Pharmaceutical Science, Capital Medical University, Beijing, China, for their contribution in revising the manuscript. This work was supported by Capital Medical University (No. 16JL13).

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Correspondence to Song Lin or Zhigang Zhao.

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Mei, S., Zhu, L., Li, X. et al. UPLC-MS/MS Analysis of Methotrexate in Human Plasma and Comparison with the Fluorescence Polarization Immunoassay. ANAL. SCI. 33, 665–670 (2017). https://doi.org/10.2116/analsci.33.665

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  • DOI: https://doi.org/10.2116/analsci.33.665

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