Abstract
Immunoaffinity chromatography using a synthesised immunosorbent was used to extract tritiated dexamethasone (with dexamethasone carrier) from equine urine at a recovery of 81.7 ± 8.4% (mean ± S.D.). A method utilising this procedure coupled to cool on-column injection gas chromatography—negative ion chemical ionisation mass spectrometry is also described for the confirmation of low levels of flumethasone in equine urine samples.
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