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Investigation of human exposure to triclocarban after showering and preliminary evaluation of its biological effects.

Authors
Schebb-NH; Inceoglu-B; Ahn-KC; Morisseau-C; Gee-SJ; Hammock-BD
Source
Environ Sci Technol 2011 Apr; 45(7):3109-3115
NIOSHTIC No.
20038964
Abstract
The antibacterial soap additive triclocarban (TCC) is widely used in personal care products. TCC has a high environmental persistence. We developed and validated a sensitive online solid-phase extraction-LC-MS/MS method to rapidly analyze TCC and its major metabolites in urine and other biological samples to assess human exposure. We measured human urine concentrations 0-72 h after showering with a commercial bar soap containing 0.6 percent TCC. The major route of renal elimination was excretion as N-glucuronides. The absorption was estimated at 0.6 percent of the 70 + / - 15 mg of TCC in the soap used. The TCC-N-glucuronide urine concentration varied widely among the subjects, and continuous daily use of the soap led to steady state levels of excretion. In order to assess potential biological effects arising from this exposure, we screened TCC for the inhibition of human enzymes in vitro. We demonstrate that TCC is a potent inhibitor of the enzyme soluble epoxide hydrolase (sEH), whereas TCC's major metabolites lack strong inhibitory activity. Topical administration of TCC at similar levels to rats in a preliminary in vivo study, however, failed to alter plasma biomarkers of sEH activity. Overall the analytical strategy described here revealed that use of TCC soap causes exposure levels that warrant further evaluation.
Keywords
Soap-products; Antibacterial-agents; Personal-protection; Analytical-methods; Liquid-chromatography; Mass-spectrometry; Metabolites; Exposure-assessment; Biochemical-analysis; Urinalysis; Sampling; Humans; Biological-effects; In-vivo-study; Enzymes; Enzyme-inhibitors; Epoxides; Biomarkers
Contact
Bruce D. Hammock, Department of Entomology and Cancer Center, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
CODEN
ESTHAG
CAS No.
101-20-2
Publication Date
20110401
Document Type
Journal Article
Email Address
bdhammock@ucdavis.edu
Funding Type
Cooperative Agreement; Agriculture
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Cooperative-Agreement-Number-U50-OH-007550
Issue of Publication
7
ISSN
0013-936X
Source Name
Environmental Science and Technology
State
CA
Performing Organization
University of California - Davis
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