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Simultaneous determination of losartan, losartan acid and amlodipine in human plasma by LC-MS/MS and its application to a human pharmacokinetic study

Submitted by webadmin on Wed, 10/19/2016 - 13:17
Pharmaceutical Methods,2012,3,1,18-25.
Published:January 2012
Type:Original Article

Simultaneous determination of losartan, losartan acid and amlodipine in human plasma by LC-MS/MS and its application to a human pharmacokinetic study

Vijaya Kumari Karra, Nageswara Rao Pilli, Jaswanth Kumar Inamadugu1, J. V. L. N. Seshagiri Rao2

University College of Pharmaceutical Sciences, Jawaharlal Nehru Technological University, Kukatpally, Hyderabad,

1Analytical and Environmental Chemistry Division, Department of Chemistry, Sri Venkateswara University, Tirupati,

2College of Pharmaceutical Sciences, Andhra University, Visakhapatnam, Andhra Pradesh, India

Abstract:

Introduction: A simple, rapid and sensitive liquid chromatography-tandem mass spectrometric assay method has been developed and fully validated for simultaneous quantification of losartan and its active metabolite, losartan carboxylic acid, and amlodipine in human plasma. Irbesartan was used as an internal standard. Materials and Methods: The analytes were extracted from human plasma samples by solidphase extraction technique using Oasis HLB cartridges, (Waters Corporation, Mumbai, India). The reconstituted samples were chromatographed on a C18 column by using an 85:15, v/v mixture of methanol and 0.1% v/v formic acid as the mobile phase at a flow rate of 1.0 mL/min. A detailed validation of the method was performed as per the FDA guidelines. Results: The calibration curves obtained were linear (r ≥ 0.99) over the concentration range of 0.5-1000 ng/mL for losartan and for its active metabolite losartan acid and 0.05-10.1 ng/mL for amlodipine. The results of the intra- and inter-day precision and accuracy studies were well within the acceptable limits. Conclusions: A run time of 2.5 min for each sample made it possible to analyze more than 300 plasma samples per day. The proposed method was found to be applicable to clinical studies.

Simultaneous LC-MS/MS quantification of losartan, losartan acid and amlodipine