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Stereometabolism of ethylbenzene in man: gas chromatographic determination of urinary excreted mandelic acid enantiomers and phenylglyoxylic acid and their relation to the height of occupational exposure

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Summary

Ethylbenzene is an important industrial solvent and a key substance in styrene production. Ethylbenzene metabolism leads to the formation of mandelic acid, which occurs in two enantiomeric forms, and phenyl-glyoxylic acid. To decide which enantiomer is preferably formed, 70 urine samples of exposed workers were taken at the end of shifts and — after 3-pentyl ester derivatisation — gas chromatographically analysed. The R/S ratio of mandelic acid enantiomers in urine amounts to 19:1, which means that R-mandelic acid is a major metabolite and S-mandelic acid is one of the minor urinary metabolites of ethylbenzene in man. The R/S ratio is independent of ambient air concentration of ethylbenzene within the investigated range. Compared to an ethylbenzene monoexposure the height of total mandelic acid excretion is decreased in the case of coexposure to other aromatic solvents.

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Authors and Affiliations

  1. Institut für Arbeits- und Sozialmedizin der Universität Tübingen, Wilhelmstraße 27, W-7400, Tübingen, Germany

    M. Korn, W. Gfrörer, R. Herz, I. Wodarz & R. Wodarz

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  1. M. Korn
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  2. W. Gfrörer
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  3. R. Herz
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  4. I. Wodarz
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  5. R. Wodarz
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Dedicated to Professor Dr. med. Heinz Weichardt on the occasion of his 75th birthday

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Korn, M., Gfrörer, W., Herz, R. et al. Stereometabolism of ethylbenzene in man: gas chromatographic determination of urinary excreted mandelic acid enantiomers and phenylglyoxylic acid and their relation to the height of occupational exposure. Int. Arch Occup Environ Heath 64, 75–78 (1992). https://doi.org/10.1007/BF00381472

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  • DOI: https://doi.org/10.1007/BF00381472

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