Abstract
A method for detecting anti-inflammatory analgesics and their metabolites in urine after acid hydrolysis is described. The acetylated extract is analysed by computerized gas chromatography-mass spectrometry. An on-line computer allows rapid identification using mass fragmentography with the masses 109, 123, 137, 188, 245, 259, 288 and 308. The identity of positive signals in the reconstructed mass fragmentogram is established by a comparison of the entire mass spectra with those of standards. The mass fragmentogram and the underlying mass spectra are documented.
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