title: Detection of genistein as an estrogenic contaminant of river water in Osaka.
abstract: The estrogenic activity in water at various localities on Lake Biwa-Yodo River, a representative watershed in Japan, was measured using a recombinant yeast that expresses the human estrogen receptor. The yeast bioassay revealed that the activities of 13 water samples had an average value of 14 pmol/L (3.8 ng/L) (17beta-estradiol equivalent) with a very wide range from 0 to 72 pmol/L (0-19.6 ng/ L), and two of the samples had prominent levels of activity (72 pmol/L (19.6 ng/L) and 56 pmol/L (15.2 ng/L)). We analyzed these two samples with instrumental approaches. A high-performance liquid chromatogram profile showed that the strong activity in one sample, which was collected just downstream of a sewage-treatment plant, would be due to 17beta-estradiol and estrone, whose source is considered to be human urine contained in the effluent of the plant. The activity in the other sample, which was obtained from a tributary river in a primarily residential area with some industrial development (i.e., Osaka City), however, did not correspond to 17beta-estradiol, estrone, or synthetic chemicals known as estrogenic. Analysis of a fraction with estrogenic activity by liquid chromatography-mass spectrometry (LC-MS) provided evidence that the activity in the water sample resulted from the presence of genistein, an isoflavone compound of plant origin.
authors.affiliation: Research Institute for Advanced Science and Technology, Osaka Prefecture University, 1-2 Gakuen-cho Sakai, Osaka 599-8570, Japan.
authors.forename: Masanobu
authors.initials: M
authors.lastname: Kawanishi
authors.forename: Takeji
authors.initials: T
authors.lastname: Takamura-Enya
authors.forename: Rahyani
authors.initials: R
authors.lastname: Ermawati
authors.forename: Chiaki
authors.initials: C
authors.lastname: Shimohara
authors.forename: Michiyo
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Kazuki
authors.initials: K
authors.lastname: Matsukawa
authors.forename: Tomonari
authors.initials: T
authors.lastname: Matsuda
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Murahashi
authors.forename: Saburo
authors.initials: S
authors.lastname: Matsui
authors.forename: Keiji
authors.initials: K
authors.lastname: Wakabayashi
authors.forename: Tetsushi
authors.initials: T
authors.lastname: Watanabe
authors.forename: H Yutaka
authors.initials: HY
authors.lastname: Tashiro
authors.forename: Takashi
authors.initials: T
authors.lastname: Yagi
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004967:Estrogens / Q000737:chemistry / Q000652:urine*; D008401:Gas Chromatography-Mass Spectrometry; D019833:Genistein / Q000652:urine*; D006801:Humans; D007564:Japan; D011960:Receptors, Estrogen / Q000187:drug effects / Q000378:metabolism; D045483:Rivers / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004967:Estrogens; D011960:Receptors, Estrogen; D014874:Water Pollutants, Chemical; D019833:Genistein