Table of Contents
ISRN Chromatography
Volume 2012 (2012), Article ID 761679, 10 pages
http://dx.doi.org/10.5402/2012/761679
Research Article

Application of a Reliable LC-MS/MS Method for Determination of Rizatriptan in Healthy Subject Samples: Demonstration of Assay Reproducibility by Incurred Sample Reanalysis

1Department of Chemistry, Pramukh Swami Science & H. D. Patel Arts College, Sarva Vidyalaya Campus, Kadi 382 715, Gujarat, India
2Bioanalytical Laboratory, Cliantha Research Ltd., Bodakdev, Ahmedabad 380054, Gujarat, India
3Department of Chemistry, School of Sciences, Gujarat University, Navrangpura, Ahmedabad 380009, Gujarat, India
4Department of Chemistry, St. Xavier’s College, Navrangpura, Ahmedabad 380009, Gujarat, India

Received 7 October 2012; Accepted 29 October 2012

Academic Editors: C. Y. Choo and A. Namera

Copyright © 2012 Dinesh S. Patel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A reliable, rapid, and selective liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay has been proposed for the determination of rizatriptan in human plasma using sumatriptan as internal standard (IS). The analyte and IS were extracted from 300 μL human plasma via liquid-liquid extraction and the chromatography was achieved on Hypurity C18 (50 mm × 4.6 mm, 5 μm) column under isocratic conditions. Detection of rizatriptan and IS was done by tandem mass spectrometry, operating in positive ionization and multiple-reaction monitoring mode. The limit of detection and lower limit of quantitation of the method were 0.04 and 0.20 ng/mL, respectively, with a linear dynamic range of 0.20–60.0 ng/mL. The intrabatch and interbatch precision (% CV) was ≤8.4% while the mean extraction recovery was >78% across quality control levels. Bench top stability, freeze and thaw stability, processed sample stability, and long-term stability in plasma were evaluated at two quality control levels. It was successfully applied to a bioequivalence study of 10 mg rizatriptan orally disintegrating tablet formulation in 40 and 32 healthy Indian male subjects under fasting and fed conditions, respectively. The reproducibility in the measurement of study data was demonstrated by reanalysis of 254 incurred samples.