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Simultaneous estimation of amlodipine and atenolol in human plasma: a sensitive LC-MS/MS method validation and its
Raja Reddy Kallem1, Ramesh Mullangi, Kishore Kumar Hotha
1College of Pharmaceutical Sciences, Andhra University, Visakhapatnam 530 003, AP, India.
Background:
A highly sensitive, specific and rapid LC-ESI-MS/MS method has been developed and validated for simultaneous quantification of amlodipine (AMD) and atenolol (ATL) in human plasma (200 µl) using AMD-d4 and ATL-d7, respectively, as an internal standard (IS) as per the regulatory guidelines.
Results:
The SPE method was used to extract the analytes and IS from human plasma. The chromatographic resolution of AMD, ATL and corresponding IS was achieved using an isocratic flow on a C18 column. The total chromatographic run time was 3 min. A linear response function was established for the range of concentrations 50-8000 pg/ml and 10-800 ng/ml for AMD and ATL, respectively, in human plasma.
Conclusion:
The intra- and inter-day accuracy and precision values for AMD and ATL met the acceptance as per regulatory guidelines. The validated assay was applied to a fixed-dose combination of AMD and ATL (Adopin-AT(®)) PK study in humans.
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