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  • Title: Development and validation of a method for quantitative determination of valsartan in human plasma by liquid chromatography-tandem mass spectrometry.
    Author: Koseki N, Kawashita H, Hara H, Niina M, Tanaka M, Kawai R, Nagae Y, Masuda N.
    Journal: J Pharm Biomed Anal; 2007 Apr 11; 43(5):1769-74. PubMed ID: 17289324.
    Abstract:
    A sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the determination of valsartan in human plasma was developed and validated. A 0.5 ml aliquot was extracted using solid-phase extraction in an Empore high performance extraction disk plate, universal resin 96-well format. The estimated calibration range of the method was 2-2000 ng/ml. The method was fully validated with intra-day mean accuracy and precision of 94.8-107% and 2.19-5.40% and inter-day mean accuracy and precision of 93.5-105% and 1.87-5.67%, respectively. No significant loss of valsartan in processed samples was confirmed in processed samples for up to 24 h at 10 degrees C. Sample dilution up to 50-fold with blank human plasma provided acceptable analyses. No interference peaks or matrix effects were observed. No effect of QC sample location results was observed in a 96-well plate. This LC-MS/MS technique was found to improve quantitative determination of valsartan allowing its pharmacokinetic evaluation with clinically relevant doses.
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