title: Determination of bisphenol A in rat brain by microdialysis and column switching high-performance liquid chromatography with fluorescence detection.
abstract: A sensitive column switching HPLC-fluorescence detection for determination of bisphenol A (BPA) in rat brain by coupling with microdialysis was developed. A microdialysis probe was inserted into the hypothalamus of rat brain and an artificial cerebrospinal fluid was used for perfusion. BPA in brain dialysate was subjected to a fluorescent derivatization with 4-(4,5-diphenyl-1H-imidazol-2-yl)benzoyl chloride (DIB-Cl), and the excess reagent was removed by a column-switching technique. Separation was carried out on two ODS semimicro-columns with the mobile phase of acetonitrile-H(2)O-methanol-tetrahydrofuran (55:10:35:2.5, v/v) and acetonitrile-0.1 M acetate buffer (pH 3.0)-methanol (35:10:55, v/v) at a flow rate of 0.10 and 0.15 mL/min for a precolumn and a separation column, respectively. Fluorescence intensity was monitored at 475 nm with excitation of 350 nm. BPA could be sensitively detected at 0.3 ppb in 60 micro L brain microdialysate at a signal-to-noise ratio of 3. By the proposed method, concentrations of BPA in rat brain and plasma were monitored for 8 h after single i.v. or oral administration. It is proved that BPA is capable of penetrating the blood-brain barrier. The ratio of the area under the concentration-time curve of BPA in rat brain to that in blood was estimated to be about 3.0-3.8%.
authors.affiliation: Department of Analytical Research for Pharmacoinformatics, Graduate School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, 852-8521, Japan.
authors.forename: Yen
authors.initials: Y
authors.lastname: Sun
authors.forename: Mihoko N
authors.initials: MN
authors.lastname: Nakashima
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Takahashi
authors.forename: Naotaka
authors.initials: N
authors.lastname: Kuroda
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Nakashima
mesh_terms: D000818:Animals; D001559:Benzhydryl Compounds; D001682:Biological Availability; D001921:Brain / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008297:Male; D017551:Microdialysis; D010636:Phenols / Q000378:metabolism* / Q000493:pharmacokinetics; D051381:Rats; D017208:Rats, Wistar; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D010636:Phenols; C006780:bisphenol A; D000098826:Bisphenol A Compounds