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Rapid and sensitive determination of indapamide in human blood by liquid chromatography with electrospray ionization mass spectrometric detection: application to a bioequivalence study.

Author(s): Tang J, Li J, Sun J, Yin J, He Z

Affiliation(s): Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China.

Publication date & source: 2005-11, Pharmazie., 60(11):819-22.

Publication type: Randomized Controlled Trial

A rapid and sensitive method using liquid chromatography with electrospray ionization mass spectrometric detection was developed and validated for the determination of indapamide in human blood. Blood samples were extracted with n-hexane-dichloromethane (1:1, v/v) and separation was performed on a Symmetry C18 column (150 x 3.9 mm i.d., 5 microm) with the mobile phase consisting of acetonitrile-water (60:40, v/v). Indapamide and internal standard (propylparaben) were detected by negative electrospray ionization and selected ion recording (SIR) at m/z 364 for indapamide and m/z 179 for propylparaben. This method has a lower limit of quantification (LLOQ) 2.0 microg/L with a linear calibration range of 2.0 microg/L to 120 microg/L. The method showed excellent reproducibility with an inter- and intra-assay precision of < 9.4% (% RSD), as well as excellent accuracy with an inter- and intra-assay accuracy of between 98.0 and 102%. Furthermore, the method was successfully applied to a bioequivalence study in which 20 healthy volunteers received a single oral dose of 3 mg reference and test sustained-release indapamide formulations, in an open, two-period, randomized crossover protocol. The maximum blood concentrations (C(max)) were 60.3 +/- 22.6 microg/L and 57.6 +/- 18.7 microg/L at 13.1 +/- 6.9 h and 18.3 +/- 7.4 h, the times to reach the peak concentration (T(max)), for the test and reference tablets, respectively. The relative bioavailability of the test tablets was 110.1 +/- 34.5%, compared with the reference tablets. There were no statistically significant differences in the main pharmacokinetic parameters, and the two formulations were judged to be bioequivalent.

Page last updated: 2006-01-31

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