title: A sensitive LC-ESI-MS method for the determination of indapamide in human plasma: method and clinical applications.
abstract: A sensitive LC-ESI-MS method for the determination of indapamide in human plasma using glibenclamide as the internal standard (IS) was established. Following acidification with 1 M hydrochloric acid solution, plasma samples were extracted with ethyl acetate and separated on a C(18) column with a mobile phase of 10 mM ammonium acetate-methanol (22:78, v/v). Indapamide was determined using electrospray ionization in a single quadrupole mass spectrometer. LC-ESI-MS was performed in the selected ion monitoring (SIM) mode using target ions at m/z 364.3 for indapamide and m/z 492.4 for the IS. Calibration curves were linear over the ranges of 0.1-100 ng/ml for indapamide. The lower limit of quantification was 0.1 ng/ml. The intra- and inter-assay precisions were less than 9.5% and 10.6%, respectively. The mean plasma extraction recovery of indapamide was 90.5-93.9%. The method has been successfully applied to study the pharmacokinetics of indapamide in healthy male Chinese volunteers.
authors.affiliation: Department of Pharmaceutical Analysis, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China. dinglidl@hotmail.com
authors.forename: Li
authors.initials: L
authors.lastname: Ding
authors.forename: Longhua
authors.initials: L
authors.lastname: Yang
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Wenzheng
authors.initials: W
authors.lastname: Ju
authors.forename: Ningning
authors.initials: N
authors.lastname: Xiong
mesh_terms: D000284:Administration, Oral; D000959:Antihypertensive Agents / Q000097:blood* / Q000493:pharmacokinetics; D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods; D019963:Clinical Chemistry Tests; D004355:Drug Stability; D004356:Drug Storage; D006801:Humans; D007190:Indapamide / Q000097:blood* / Q000493:pharmacokinetics; D008297:Male; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D000959:Antihypertensive Agents; D007190:Indapamide