title: Detection of flunixin in equine urine using high-performance liquid chromatography with particle beam and atmospheric pressure ionization mass spectrometry after solid-phase extraction.
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.
authors.affiliation: Laboratory of the Jockey Club of Southern Africa, Johannesburg.
authors.forename: S M
authors.initials: SM
authors.lastname: Stanley
authors.forename: N A
authors.initials: NA
authors.lastname: Owens
authors.forename: J P
authors.initials: JP
authors.lastname: Rodgers
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000652:urine*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003002:Clonixin / Q000031:analogs & derivatives* / Q000652:urine; D005260:Female; D006736:Horses; D013058:Mass Spectrometry / Q000379:methods*; D011312:Pressure
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; C014557:flunixin; D003002:Clonixin