title: Quantitative determination of formononetin and its metabolite in rat plasma after intravenous bolus administration by HPLC coupled with tandem mass spectrometry.
abstract: A new simple, rapid, sensitive and accurate quantitative detection method using liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) for the measurement of formononetin (FMN) and daidzein (DZN) levels in rat plasma is described. Analytes were separated on a Supelco Discovery C18 (4.6x50 mm, 5.0 microm) column with acetonitrile: methanol (50:50, v/v) and 0.1% acetic acid in the ratio of 90:10 (v/v) as a mobile phase. The method was proved to be accurate and precise at linearity range of 5-100 ng/mL with a correlation coefficient (r) of > or = 0.996. The intra- and inter-day assay precision ranged from 1.66-6.82% and 1.87-6.75%, respectively; and intra- and inter-day assay accuracy was between 89.98-107.56% and 90.54-105.63%, respectively for both the analytes. The lowest quantitation limit for FMN and DZN was 5.0 ng/mL in 0.1 mL of rat plasma. Practical utility of this new LC-MS/MS method was demonstrated in a pharmacokinetic study in rats following intravenous administration of FMN.
authors.affiliation: Pharmacokinetics and Metabolism Division, Central Drug Research Institute, CSIR, Lucknow 226001 Uttar Pradesh, India.
authors.forename: Sheelendra Pratap
authors.initials: SP
authors.lastname: Singh
authors.lastname: Wahajuddin
authors.forename: Dinesh K
authors.initials: DK
authors.lastname: Yadav
authors.forename: Preeti
authors.initials: P
authors.lastname: Rawat
authors.forename: Rakesh
authors.initials: R
authors.lastname: Maurya
authors.forename: Girish Kumar
authors.initials: GK
authors.lastname: Jain
mesh_terms: D000818:Animals; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004355:Drug Stability; D005260:Female; D007275:Injections, Intravenous; D007529:Isoflavones / Q000008:administration & dosage* / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry / Q000379:methods*; D013997:Time Factors
chemical_list: D007529:Isoflavones; C007768:formononetin; C004742:daidzein