High-performance liquid chromatographic assay for the quantitation of irbesartan (SR 47436/BMS-186295) in human plasma and urine

Journal of Chromatography. B, Biomedical Sciences and Applications
S Y ChangR Patel

Abstract

A selective, accurate, precise and reproducible high-performance liquid chromatographic assay was developed for the quantitation of irbesartan, an angiotensin II antagonist, in human plasma and urine samples. The method involved solid-phase extraction of irbesartan and internal standard (I.S.) using a 100-mg Isolute CN cartridge. A portion of the eluate was injected onto an ODS analytical column connected to a fluorescence detector that was set at an excitation wavelength of 250 nm and an emission wavelength of 371 nm. The mobile phase consisted of 50% acetonitrile and a 50% weak phosphate-triethylamine solution, pH 3.5, at a flow-rate of 0.8 ml/min. The assay was linear from 1 to 1000 ng/ml with both plasma and urine. In either matrix, the lower limit of quantitation was 1 ng/ml. The analyses of quality control samples indicated that the nominal values could be predicted with an accuracy >95%. The inter- and intra-day coefficients of variation for the analyses in both matrices were <8%. Irbesartan was stable in both human plasma and urine for at least seven months at -20 degrees C. The application of the assay to a pharmacokinetic study is described.

Citations

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