WANG Yixuan, WU Dan, CAO Junning, QIAN Jun. Determination of methotrexate in human plasma by HPLC and qualitative analysis of its metabolite by mass spectrometry[J]. Journal of Pharmaceutical Practice and Service, 2015, 33(2): 143-146,158. doi: 10.3969/j.issn.1006-0111.2015.02.013
Citation:
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WANG Yixuan, WU Dan, CAO Junning, QIAN Jun. Determination of methotrexate in human plasma by HPLC and qualitative analysis of its metabolite by mass spectrometry[J]. Journal of Pharmaceutical Practice and Service, 2015, 33(2): 143-146,158. doi: 10.3969/j.issn.1006-0111.2015.02.013
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Determination of methotrexate in human plasma by HPLC and qualitative analysis of its metabolite by mass spectrometry
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Department of Medical Oncology, Cancer Hospital Affilliated to Fudan University; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
- Received Date: 2014-04-03
- Rev Recd Date:
2014-06-26
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Abstract
Objective To develop an SPE-HPLC method for the determination of methotrexate (MTX) in human plasma to monitor the clinical drug use of MTX, and to identify the human metabolite of MTX by mass spectrometry. Methods MTX was extracted from human plasma using C18 SPE column and analyzed directly after elution. The separation of MTX was performed on Diamonsil C18 column (150 mm×4.6 mm, 5 m) with a gradient mobile phase of methanol and 0.5% acetic acid solution (containing 0.3% triethylamine) at a flow rate of 1.0 ml/min. The detection wavelength was 306 nm. QLMS and MRM-IDA-EPI scan modes were used to obtain the mass spectrum of MTX metabolite. Results The calibration curve of MTX in plasma was linear over the range of 0.05-100 μmol/L(r=0.999 9). The extraction recovery was above 95% and accuracy was between 97% and 105%. Both intra-and inter-day precision were less than 5%. 7-OH MTX was identified to be the metabolite through the analysis of the mass spectrum. Conclusion The method is sensitive, reproducible, easy to operate and suits for monitoring the concentration of MTX in clinical practice.
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Proportional views
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