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Determination of methotrexate in environmental samples by solid phase extraction and high performance liquid chromatography: ultraviolet or tandem mass spectrometry detection?
Author(s) -
Turci Roberta,
Micoli Giuseppina,
Minoia Claudio
Publication year - 2000
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(20000430)14:8<685::aid-rcm937>3.0.co;2-2
Subject(s) - chromatography , chemistry , detection limit , solid phase extraction , mass spectrometry , high performance liquid chromatography , tandem mass spectrometry , analyte , extraction (chemistry) , liquid chromatography–mass spectrometry
In order to assess exposure levels of hospital personnel involved in the preparation and administration of antineoplastic drugs, environmental monitoring should be carried out. Wipe samples, pads, gloves and air samples should be collected at the end of each work shift, properly treated and then analysed using instrumental techniques which are sufficiently sensitive and specific to detect even trace amounts of drug. In this study, a method using high performance liquid chromatography/tandem mass spectrometry (HPLC/MS/MS), incorporating solid phase extraction (SPE), was validated for determination of methotrexate (MTX) in wipe and air samples. Each step of the method was first developed and optimised using ultraviolet detection (UV), and afterwards tandem mass spectrometry was used to obtain a lower limit of quantitation when the expected drug level was less than the analytical UV detection limit. SPE enabled a 20‐fold preconcentration of the analyte when using HPLC/UV and a further 30‐fold preconcentration was obtained when analysing samples by HPLC/MS/MS. For example, the limit of quantitation (LLQ) was lowered from 3000 ng on wipe (direct injection onto an HPLC/UV system) to 5 ng on wipe (SPE plus HPLC/MS/MS). 7‐hydroxymethotrexate was used as internal standard to assess precision and accuracy. Copyright © 2000 John Wiley & Sons, Ltd.