title: Liquid chromatographic assay for the simultaneous determination of indole-3-carbinol and its acid condensation products in plasma.
abstract: A high-performance liquid chromatographic method was developed for the simultaneous determination of indole-3-carbinol (I3C), 3,3'-diindolylmethane (DIM), [2-(indol-3-ylmethyl)-indol-3-yl]indol-3-ylmethane (LTr(1)), and indolo[3,2b]carbazole (ICZ). Compounds were extracted from mouse plasma using tert.-butyl methyl ether, incorporating 4-methoxy-indole as internal standard. Chromatographic separation utilized a Waters Symmetry RP18 in tandem with a Thermoquest BDS C(18) column, an acetonitrile-water gradient and UV (280 nm) in series with fluorescence (ex. 335 nm; em. 415 nm) detection. Calibration curves were linear (r(2)>0.99) between 50 and 15,000 ng/ml for I3C; 150 and 15,000 ng/ml for LTr(1); and 0.15 and 37.5 ng/ml for ICZ and the method was reproducible and precise (within-day and between-day coefficients of variation below 9.7 and 13%, respectively). The method described is suitable for comprehensive pharmacokinetic studies with indole-3-carbinol.
authors.affiliation: Department of Oncology, University of Leicester, Robert Kilpatrick Clinical Sciences Building, Leicester Royal Infirmary, Leicester LE2 7LX, UK.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Anderton
authors.forename: Rebekah
authors.initials: R
authors.lastname: Jukes
authors.forename: John H
authors.initials: JH
authors.lastname: Lamb
authors.forename: Margaret M
authors.initials: MM
authors.lastname: Manson
authors.forename: Andreas
authors.initials: A
authors.lastname: Gescher
authors.forename: William P
authors.initials: WP
authors.lastname: Steward
authors.forename: Marion L
authors.initials: ML
authors.lastname: Williams
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D007211:Indoles / Q000097:blood*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D007211:Indoles; C016517:indole-3-carbinol