Abstract
A gas chromatographic-mass spectrometric (GC-MS) screening procedure for 23 acidic drugs in equine urine is described. With the GC-MS method fifteen anti-inflammatory drugs, five barbiturates and three methyl xanthines can be detected with good sensitivity and selectivity. The method consists of alkaline hydrolysis, extraction with organic solvent using salting-out, clean-up extraction, methylation and screening with GC-MS in selected-ion monitoring mode. The limit of detection is 10 micrograms 1(-1) or lower, for most drugs.
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