Citation:

HENDERSON, A. P., M. L. BARNES, C. BLEASDALE, R. CAMERON, W. CLEGG, S. L. HEATH, A. B. LINDSTROM, S. M. RAPPAPORT, S. WAIDYANATHA, W. P. WATSON, AND B. T. GOLDING. REACTION OF BENZENE OXIDE WITH THIOLS INCLUDING GLUTATHIONE. CHEMICAL RESEARCH IN TOXICOLOGY. American Chemical Society, Washington, DC, 18(2):265-270, (2005).

Impact/Purpose:

The objective of this task is to develop state-of-the-art methods for measuring xenobiotic compounds, to include the isolation of the analyte from the appropriate matrix (extraction), preconcentration (typically sorbent-based), and analysis via GC/MS and/or LC/MS. Once established, these methods will be applied in small scale pilot studies or demonstration projects. Particular emphasis will be placed on methods which are readily transferable to other laboratories, including those within the Human Exposure and Atmospheric Sciences Division (HEASD), the National Exposure Research Laboratory (NERL), other EPA Laboratories, Program Offices, Regions, and academic institutions.

Specific objectives of this task include the following:

1) Development of GC/MS and LC/MS methods for the measurement of key xenobiotic compounds and their metabolites (to include the pyrethroid pesticides, perfluorinated organic compounds, and the BFRs) in relevant environmental and biological matrices.

2) Development of efficient low cost methods for the extraction and clean up of these compounds collected from relevant matrices.

3) Determination of xenobiotic compound and metabolite concentrations in samples derived from laboratory and field monitoring studies to help assess exposures and evaluate associated risks.

Description:

This study accounts for the observations that the metabolism of benzene is dominated by the formation of phenol. As demonstrated here, the pathway leading to S-phenylmercapturic acid is necessarily minor on account of the low efficiency of benzene oxide capture by glutathione at pH 7 versus spontaneous rearrangement to phenol.

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