Metabolism of 4-hydroxyanisole: identification of major urinary excretory products.
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Pavel S, Holden JL, Riley PA
Metabolism of 4-hydroxyanisole: identification of major urinary excretory products.
Pigment Cell Res. 1989 Sep-Oct;2(5):421-6.
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- 2587513 [ View in PubMed]
- Abstract
The human metabolism of 4-hydroxyanisole was investigated by the analysis of urine samples from melanoma patients treated with this substance. The samples were hydrolyzed with glucoronidase and/or arylsulphatase, extracted with ethyl acetate, and, after derivatization with pentafluoropropionylanhydride, analyzed by gas chromatography-mass spectrometry. We were able to identify peaks by their retention times and mass spectra corresponding to 4-hydroxyanisole, 3,4-dihydroxyanisole, and two of its o-methyl derivatives, namely, 3-hydroxy-4-methoxy- and 4-hydroxy-3-methoxyanisole. We also detected a peak of hydroquinone, which may have originated (at least partly) from 4-hydroxyanisole. All the above-mentioned compounds were excreted predominantly as sulphates and glucuronides. Only a small proportion of the substances was present in urine in an unconjugated form. Our results demonstrate that 3,4-dihydroxyanisole is the most important metabolite of 4-hydroxyanisole.
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