Industrial Health
Online ISSN : 1880-8026
Print ISSN : 0019-8366
ISSN-L : 0019-8366
Determination of Specific Mercapturic Acids as an Index of Exposure to Environmental Benzene, Toluene, and Styrene
Luciano MAESTRISergio GHITTORIMarcello IMBRIANI
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1997 Volume 35 Issue 4 Pages 489-501

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Abstract

Methods were developed for the determination of urinary phenylmercapturic acid (PMA), a metabolite specific for benzene, benzylmercapturic acid (BMA), a metabolite of toluene and phenylhydroxyethylmercapturic acids (PHEMAs), specific for styrene, in human beings. Methods involved sample clean up followed by deacetylation and derivatization of the compounds with o-phthaldialdehyde and 2-mercaptoethanol. The fluorescent derivatives were separated on reversed-phase columns with gradient runs and detected by a fluorescence detector. The detection limits were 0.5μg/l for PMA and BMA, and 7μg/l for PHEMAs. The background levels of PMA were higher in smokers than in nonsmokers, while no difference was found in the levels of BMA and PHEMAs. Coexposure to ethanol enanched the excretion of BMA in subjects experimentally exposed to toluene. Correlations were found between environmental benzene (r=0.74, log transformed data), toluene (r=0.74) or styrene (r=0.56) and specific mercapturic acids in workers. The usefulness of PMA, BMA and PHEMAs as biomarkers is critically evaluated.

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© National Institute of Occupational Safety and Health
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