Araújo A C, Salvadori M C, Velletri M E, Camargo M M
Divisão de Controle e Pesquisas Antidopagem, Jockey Club de São Paulo, Brazil.
J Anal Toxicol. 1990 May-Jun;14(3):146-8. doi: 10.1093/jat/14.3.146.
The possibility of false negative results from TLC when a diuretic is administered concomitantly with flunixin was studied. Samples were subjected to solvent extraction from acidic aqueous solutions; duplicate samples were also subjected to alkaline hydrolysis at pH 12.5. The internal standard was flufenamic acid. The quantification of flunixin was performed by HPLC and the results confirmed by GC/MS. The data show that furosemide influences the urinary concentration of flunixin.
