title: Simultaneous determination of isoflavones and bisphenol A in rat serum by high-performance liquid chromatography coupled with coulometric array detection.
abstract: A method for simultaneous detection and quantification is presented to determine the presence of isoflavones and bisphenol A in a biological sample. A coulometric array detector was used with reversed-phase high-performance liquid chromatography (HPLC). Daidzein (1), glycitein (2), genistein (3) and their glucoside conjugates, daidzin (4), glycitin (5) and genistin (6), were measured as phytochemicals. Also assayed here was equol (7), a metabolite from compound 1, and bisphenol A (8), an industrial chemical that acts as an endocrine disrupter. All chemicals were simultaneously detected by using a 600-mV single detection voltage with high efficacy. A mixture of 1, 3 and 8 was orally administered to rats, and the levels of these three chemicals in the serum were clearly increased after a 4 kU beta-glucuronidase treatment. The levels of compounds 1 and 3 in the serum were detected at 1665 and 2040 ng/ml, while 8 was at a low level of 417 ng/ml. Compound 7 in the serum was not detected until after enzymatic hydrolysis (72 ng/ml). These results suggest that this analytical method would be useful for metabolic and pharmacokinetic studies on isoflavones and bisphenol A.
authors.affiliation: Laboratory of Food Chemistry, Division of Applied Biological Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan. syasuda@agr.kyushu-u.ac.jp
authors.forename: Shin
authors.initials: S
authors.lastname: Yasuda
authors.forename: Po-Sheng
authors.initials: PS
authors.lastname: Wu
authors.forename: Emi
authors.initials: E
authors.lastname: Hattori
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tachibana
authors.forename: Koji
authors.initials: K
authors.lastname: Yamada
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001559:Benzhydryl Compounds; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003124:Colorimetry / Q000379:methods*; D019833:Genistein / Q000008:administration & dosage / Q000097:blood / Q000494:pharmacology; D005966:Glucuronidase / Q000008:administration & dosage / Q000494:pharmacology; D007529:Isoflavones / Q000008:administration & dosage / Q000097:blood* / Q000494:pharmacology; D008297:Male; D010636:Phenols / Q000008:administration & dosage / Q000097:blood* / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D019833:Genistein; D005966:Glucuronidase; D007529:Isoflavones; D010636:Phenols; C040641:genistin; C013908:daidzin; C004742:daidzein; C086566:glycitein; C433283:glycitin; C006780:bisphenol A; D000098826:Bisphenol A Compounds