Selective detection of monohydroxy metabolites of polycyclic aromatic hydrocarbons in urine using liquid chromatography/triple quadrupole tandem mass spectrometry.

Published

Journal Article

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitously present in the environment and associated with a variety of adverse health effects. Monohydroxylated PAHs (OH-PAHs), metabolites of PAHs, have been employed as biomarkers for human exposure assessment of PAHs. This manuscript describes new, selective detection methods for OH-PAHs using liquid chromatography and tandem mass spectrometry (LC/MS/MS). Electrospray ionization was operated in the negative ion mode to detect the deprotonated PAH metabolites ([M-H](-)). Hydroxylated metabolites of naphthalene, fluorene, phenanthrene, fluoranthene, pyrene, benzo[c]phenanthrene, chrysene, benzo[a]anthracene, and benzo[a]pyrene were selected for the method development. Based on the collision-induced dissociation MS/MS spectra of the selected OH-PAHs, a characteristic ion fragmentation, loss of 28 Da from the [M--H](-) ion, was identified for all of these OH-PAHs. This characteristic fragmentation was exploited for selective screening for OH-PAHs in human urine by incorporating a constant neutral loss (CNL) scan with data-dependent scanning, using a triple quadruple mass spectrometer. Selected reaction monitoring (SRM) was also used to tentatively identify isomers of the target OH-PAHs in human urine. The excellent linearity (3-4 orders of magnitude) and signal-to-noise performance provided by the SRM method allowed development of a sensitive LC/MS/MS method for measuring OH-PAHs in urine samples. The limits of detection of the SRM method ranged from approximately 0.1-5 pg on column for a suite of OH-PAHs tested in the study. The LC-SRM method was applied, following enzymatic deconjugation and solid-phase extraction of the urine, to preliminarily determine the OH-PAH concentrations in urine specimens from six Chinese non-occupationally exposed workers and seven Chinese coke oven workers.

Full Text

Duke Authors

Cited Authors

  • Xu, X; Zhang, J; Zhang, L; Liu, W; Weisel, CP

Published Date

  • January 2004

Published In

Volume / Issue

  • 18 / 19

Start / End Page

  • 2299 - 2308

PubMed ID

  • 15384151

Pubmed Central ID

  • 15384151

Electronic International Standard Serial Number (EISSN)

  • 1097-0231

International Standard Serial Number (ISSN)

  • 0951-4198

Digital Object Identifier (DOI)

  • 10.1002/rcm.1625

Language

  • eng