title: Determination of p-tert-octylphenol in blood and tissues by gas chromatography coupled with mass spectrometry.
abstract: A sensitive and reproducible procedure using gas chromatography coupled with mass spectrometry is described for the determination of p-tert-octylphenol (OP), a persistent degradation product of alkylphenol ethoxylates that binds to the estrogen receptor in blood and tissues. The first step involved the extraction of blood (200 microL) or tissue homogenate (400 microL) with methyl tert-butyl ether, including p-tert-butylphenol (BP) as internal standard. After extraction, the sample was evaporated to dryness with a gentle stream of nitrogen at 45 degrees C, and OP and BP were derivatized with an acetylation reaction involving acetic anhydride and catalyzed by pyridine. Samples were then analyzed by a gas chromatograph equipped with a mass spectrometer (single ion monitoring) with a Varian VF-5ms capillary column. The limit of detection and the limit of quantification of the method in blood were 4.6 and 15.5 ng/mL, respectively. The linearity and reproducibility of the method were acceptable, with coefficients of variation of approximately 10% for blood and ranging between 9% and 27% for tissues. This method was applied to the determination of unchanged OP in blood and tissues obtained from Sprague-Dawley rats after oral and IV OP administration.
authors.affiliation: Département de santé environnementale et santé au travail, Université de Montréal, Montréal, Québec, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Hamelin
authors.forename: G
authors.initials: G
authors.lastname: Charest-Tardif
authors.forename: K
authors.initials: K
authors.lastname: Krishnan
authors.forename: D G
authors.initials: DG
authors.lastname: Cyr
authors.forename: M
authors.initials: M
authors.lastname: Charbonneau
authors.forename: P J
authors.initials: PJ
authors.lastname: Devine
authors.forename: S
authors.initials: S
authors.lastname: Haddad
authors.forename: G M
authors.initials: GM
authors.lastname: Cooke
authors.forename: T
authors.initials: T
authors.lastname: Schrader
authors.forename: R
authors.initials: R
authors.lastname: Tardif
mesh_terms: D000818:Animals; D004785:Environmental Pollutants / Q000097:blood / Q000493:pharmacokinetics*; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D008297:Male; D010636:Phenols / Q000097:blood / Q000493:pharmacokinetics*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D014018:Tissue Distribution
chemical_list: D004785:Environmental Pollutants; D010636:Phenols; C105260:4-tert-octylphenol