Quantitative measurement of 17 beta-estradiol and estriol in river water by time-resolved fluoroimmunoassay.
A sensitive method for detecting 17 beta-estradiol (E2) and estriol (E3) in river water has been developed, based on the time-resolved fluoroimmunoassay by using a fluorescent europium chelate label, 4,4'-bis(1",1",1",2",2",3",3"-heptafluoro-4",6"-hexanedion-6"-yl)- chlorosulfo-o-terphenyl (BHHCT)-Eu3+. In the E2 assay, microtiter plates were coated with the E2-bovine serum albumin (BSA) conjugate. The anti-17 beta-estradiol antibody, the biotinylated goat anti-rabbit IgG antibody and the BHHCT-Eu3+ labeled streptavidin (SA)-BSA conjugate were used. In the E3 assay, the goat anti-rabbit IgG antibody was coated on a microtiter plate. The anti-estriol antibody and the BHHCT-Eu3+ labeled E3-BSA conjugate were used. The detection limits for E2 and E3 were 2.3 pg/ml and 4.3 pg/ml, respectively, and the analytical recoveries were 95-120%. Quantitative measurement of estrogens in river water was carried out for Kanda River (Tokyo, Japan) by using the method. The E2 and E3 levels were 32 pg/ml and 5.5 pg/ml, respectively. The detection limits of the present method are in the same orders of magnitude as those of ELISA for E2, and are 1-2 orders of magnitude better for E3.
Department of Chemistry, Waseda University, Advanced Research Institute for Science and Engineering, Shinjuku, Tokyo 169-8555, Japan.
Keisuke
K
Majima
Takashi
T
Fukui
Jingli
J
Yuan
Guilan
G
Wang
Kazuko
K
Matsumoto
D000818:Animals; D002138:Calibration; D003429:Cross Reactions; D004958:Estradiol / Q000032:analysis* / Q000276:immunology; D004964:Estriol / Q000032:analysis* / Q000276:immunology; D005063:Europium; D005456:Fluorescent Dyes; D015200:Fluoroimmunoassay / Q000295:instrumentation / Q000379:methods / Q000592:standards; D005618:Fresh Water / Q000032:analysis*; D006801:Humans; D012680:Sensitivity and Specificity; D014873:Water Pollutants / Q000032:analysis
D005456:Fluorescent Dyes; D014873:Water Pollutants; D005063:Europium; D004958:Estradiol; D004964:Estriol