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Evaluation Studies
Journal Article
Validation Studies
Determination of ecabet in human plasma by high-performance liquid chromatography-tandem mass spectrometry.
Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences 2008 March 2
This paper describes a simple, robust and cost-effective assay for the determination of ecabet in human plasma. After a simple step of protein precipitation using methanol, plasma samples were analyzed by reverse phase high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC-ESI-MS/MS) with valsartan as the internal standard (I.S.). Ecabet and the I.S. valsartan were separated on a Venusil MP C18 analytical column using methanol-10mM ammonium acetate (75:25, v/v, pH 3.0) as mobile phase at a flow rate of 1.0 mL/min. Ecabet and I.S. were eluted at 0.91 and 0.92 min, respectively, ionized in negative mode, and then detected by multiple reaction monitoring (MRM) essay. The MRM transitions of m/z 379.1-->m/z 277.1 and m/z 434.3-->m/z 350.1 were used to quantify ecabet and I.S., respectively. The assay was linear over the concentration range of 10-6000 ng/mL and was successfully applied to a pharmacokinetic study in healthy volunteers.
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