Liquid chromatography tandem mass spectrometry method for the estimation of  modafinil in human plasma

Rahul Bharatiya; Sanjeev Mishra; Arshad Khuroo; Goru N.V.S. Satyanarayana; Vivek Kumar Agarwal; Sunil S. Iyer; Tausif Monif; Pankaj Partani

Authors

Rahul Bharatiya Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Sanjeev Mishra Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Arshad Khuroo Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Goru N.V.S. Satyanarayana Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Vivek Kumar Agarwal Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Sunil S. Iyer Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Tausif Monif Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India
Pankaj Partani Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Research Laboratories, Plot: GP-5, Sec-18, HSIIDC, Old Delhi-Gurgaon Road, Gurgaon 122 015, Haryana, India

Keywords:

Modafinil; LC-MS/MS; Solid phase extraction; Method development; Method validation

Abstract

A rapid, selective and sensitive high performance liquid chromatography–tandem mass spectrometry method (LC-MS/MS) was developed and validated for the estimation of modafinil in human plasma. Modafinil and the internal standard (ISTD), Modafinil-D5, were extracted from plasma samples using solid phase extraction with Agilent^®Bond Elut Plexa cartridges. Chromatographic separation was performed on a Ascentis^® C18 column (150mm×4.6mm, 5µm) using methanol: 2mM ammonium acetate: glacial acetic acid (35:65:0.1% v/v/v) as the mobile phase at a flow rate of 1.0 mL/min. Detection of modafinil and modafinil-D5 was achieved by tandem mass spectrometry with an electrospray ionization (ESI) interface in positive ion mode. The calibration curves were linear over the range of 30.8 to 8022.1 ng/mL. The method has a lower limit of quantitation (LLOQ) of 30.8 ng/mL and the limit of detection (LOD) achieved of 1 ng/mL for modafinil, based on a signal to noise ratio of 10. The intra- and inter-day precisions were within 3.1%, while the accuracy was within ±3.3% of nominal values. No matrix effect was observed in this method.