title: Determination of estrogens and their conjugates in water using solid-phase extraction followed by liquid chromatography-tandem mass spectrometry.
abstract: An analytical procedure for the determination of steroid estrogens and their conjugates was developed and applied to aqueous environmental samples. The analytes of 15 compounds were solid-phase extracted and fractionated into two fractions: one containing unconjugated (free) steroids and the other containing conjugates (sulfates and glucuronides). Identification and quantification were carried out using liquid chromatography coupled with tandem mass spectrometry. The recoveries for each compound ranged from 57 to 116% and reproducibilities represented as RSD ranged from 2.9 to 17%. Some of the sulfates and free compounds were detected in environmental samples, whereas most of the conjugates were below the detection limits.
authors.affiliation: Endocrine Disrupters Research Laboratory, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan. isobe.tomohiko@nies.go.jp
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Isobe
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Shiraishi
authors.forename: Masaru
authors.initials: M
authors.lastname: Yasuda
authors.forename: Akiko
authors.initials: A
authors.lastname: Shinoda
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Suzuki
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Morita
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D004967:Estrogens / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004967:Estrogens; D014874:Water Pollutants, Chemical