Journal
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
Volume 18, Issue 19, Pages 2338-2342Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/rcm.1631
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An investigation has been conducted into the metabolism and urinary excretion of orally administered piroxicam and tenoxicam in the horse. The major component detected in urine after the administration of piroxicam was 5'-hydroxypiroxicam, which was detectable up to 24h post-administration. Unchanged piroxicam was present only as a minor component. In contrast, unchanged tenoxicam was the major component observed after the administration of tenoxicam, being detectable for 72 h post-administration, while 5'-hydroxytenoxicam was a minor component. Phase II beta-glucuronide conjugation in each case was found to be negligible. The ion trap mass spectral characteristics of piroxicam, tenoxicam, 5'-hydroxypiroxicam and 5'-hydroxytenoxicam under electrospray ionisation conditions were examined in some detail. Copyright (C) 2004 John Wiley Sons, Ltd.
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