Journal
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
Volume 937, Issue -, Pages 1-6Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchromb.2013.07.026
Keywords
Methotrexate; Liquid chromatography; Tandem mass spectrometry; Saliva excretion study
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A sensitive and simple method for the methotrexate quantification was developed using aminopterin as internal standard. Methotrexate is an anticancer agent that is widely used in a variety of human cancers including primary central nervous system lymphoma. The compound was quantified by liquid-chromatography coupled to electrospray ionization (positive ion-mode) low-energy collision dissociation-tandem mass spectrometry. Quantitative detection was by multiple reaction monitoring of the transitions of the [M + H]+ ion of MTX to its common product ion at m/z 308.4 and of aminopterin at m/z 441.2 -> m/z 294.0. The method demonstrated linearity over at least three orders of magnitude and had a detection limit of 1 ng/ml for methotrexate. A run time of less than 8.0 min for each sample made it possible to analyze a large number of human saliva samples per day. Application of this procedure was demonstrated to a saliva excretion study of methotrexate on the samples obtained after an intravenously administration of 1 mg/kg/dose of methotrexate to six patients with acute lymphoblastic leukemia (c) 2013 Elsevier B.V. All rights reserved.
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