Determination of the N-acetyl metabolites of 4,4 -methylene dianiline and 4,4 -methylene-bis(2-chloroaniline) in urine.
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(0) (0 Votes)Views: () Date: (1988-9-1) Pages: () -
Author: D S Davies
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Abstract: A sensitive and specific gas chromatographic/mass spectrometric assay is described for the determination of N-acetyl 4,4'-methylene dianiline (N-acetyl MDA) and N-acetyl 4,4'-methylene-bis(2 -chloroaniline) (N-acetyl MbOCA) in urine. The method is based on the solvent extraction of the compounds together with deuterium-labelled internal standards, the compounds being separated and detected by capillary gas chromatography/mass spectrometry as their pentafluoropropyl derivatives. The method has been applied to the detection of N-acetyl MbOCA and N-acetyl MDA in the urine of workers occupationally exposed to MbOCA and MDA. The results show that whilst N-acetyl MbOCA is a relatively minor urinary metabolite a significant proportion of MDA is excreted as the N-acetylated compound.
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