Abstract
A normal-phase HPLC method combined with particle-beam mass spectrometry (PB-MS) was developed for the analysis of non-steroidal anti-inflammatory drugs (NSAIDs). The forty one NSAIDs analysed responded in one or more (electron impact, positive and negative chemical ionisation) modes and highly characteristic spectra were produced. A mixed-mode solid-phase extraction (SPE) method for isolating acidic NSAIDs was developed using the Bond Elut Certify II cartridge. The average recovery was 88.5%. Flunixin, extracted by SPE from urine of a mare to which the meglumine salt had been administered was positively identified by HPLC-PB-MS and HPLC-atmospheric pressure ionization (API) MS methods.
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