title: Studies on the metabolism of 2,4'-isobutylphenylpropionic acid (ibuprofen) by gas chromatography and mass spectrometry. Dialysis fluid, a convenient medium for studies on drug metabolism.
abstract: 2,4'-Isobutylphenylpropionic acid (ibuprofen) has previously been demonstrated to yield four urinary metabolites, formed by omega 1-, omega 2- and omega 3-hydroxylation and by a further oxidation of the primary alcohol of the omega 1-hydroxylated metabolite to a carboxyl group. By synthesis and gas chromatography--mass spectrometry the suggested structure of the omega 3-hydroxylated metabolite was verified in the present study. Moreover, a new metabolite, 2,4'-carboxyphenylpropionic acid, was demonstrated to be present in substantial amounts in dialysis fluid from a nephrectomized patient. In such patients ingested drugs cannot be excreted in the urine, but are metabolized to end products. Thus, dialysis fluid may be a convenient medium for studies on drug metabolism.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002849:Chromatography, Gas; D006801:Humans; D007052:Ibuprofen / Q000378:metabolism / Q000652:urine*; D013058:Mass Spectrometry; D006435:Renal Dialysis
chemical_list: D007052:Ibuprofen