Determination of anethole trithione in human plasma using high performance liquid chromatography coupled with tandem mass spectrometric detection

A rapid, sensitive and reliable high performance liquid chromatographic method coupled with tandem mass spectrometry via electrospray ionization (ESI) source (HPLC-MS/MS) has been developed and validated for the determination of anethole trithione (ATT) in human plasma. Diazepam was employed as the internal standard (IS). Sample extracts following liquid-liquid extraction were injected into the HPLC-MS/MS system. The analyte and IS were eluted isocratically on a C-18 column, with a mobile phase consisting of methanol and aqueous ammonium acetate solution (5 mM) (80:20, v/v) The ions were detected by a triple quadrupole mass spectrometric detector in the positive mode. Quantification was performed using selected reaction monitoring (SRM) of the transitions mlz 240.88 -> 197.91 and mlz 285.01 -> 193.02 for ATT and for the IS, respectively. The analysis time for each run was 5.0 min. The calibration curve fitted well over the concentration range of 0.02-5 ng mL(-1), with the regression equation y = 1. 10 1 4x + 0.000363 1, r = 0.9992. The intra-batch and inter-batch R.S.D.% were less than 15 % at all concentration levels within the calibration range. The recoveries were more than 80%. The present method provides a modern, rapid and robust procedure for the pharmacokinetic study of ATT. Some important pharmacokinetic parameters of ATT in healthy Chinese volunteers are also given for the first time. (C) 2007 Elsevier B.V. All rights reserved.