Summary
Untransformed retinoic acid has never been demonstrated in human excreta under normal physiological conditions. We have developed a two-step liquid chromatographic system for the demonstration of subnanogram amounts of this compound in human urine without administration of any precursor.
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The work was supported by a grant of the N.F.S.R. to W.L.
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Lambert, W.E., De Leenheer, A.P. Demonstration of retinoic acid isomers in human urine under physiological conditions. Experientia 41, 359–360 (1985). https://doi.org/10.1007/BF02004504
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DOI: https://doi.org/10.1007/BF02004504