alexa Simultaneous determination of simvastatin and simvastatin acid in human plasma by LC-MS MS without polarity switch: application to a bioequivalence study.
Chemical Engineering

Chemical Engineering

Journal of Chromatography & Separation Techniques

Author(s): Patel BN, Sharma N, Sanyal M, Shrivastav PS

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Abstract A simple, specific and sensitive LC-MS/MS assay for simultaneous determination of simvastatin (SV) and its active beta-hydroxy acid metabolite, simvastatin acid (SVA) in human plasma was developed using a statin analog as internal standard (IS). The method was validated over a dynamic linear range of 0.20-100.00 ng/mL for SV and 0.10-50.00 ng/mL for SVA with correlation coefficient r > or = 0.9987 and 0.9989, respectively. The analytes and IS were extracted from 500 microL aliquots of human plasma via liquid-liquid extraction using methyl tert-butyl ether and separated through an Aquasil C18 column (100 mm x 2.1 mm, 5 microm). Detection of analytes and IS was done by MS/MS with a turbo ion spray interface operating in positive ion and selective reaction monitoring acquisition mode. The total chromatographic run time was 3.0 min. Flash freezing of the aqueous phase was an added advantage during liquid-liquid extraction, which considerably reduced time and labour. The method was extensively validated for its accuracy, precision, recovery, stability studies and matrix effect. The method was successfully used for bioequivalence study of 40 mg SV tablet formulation in 12 human subjects under fasting condition. This article was published in J Sep Sci and referenced in Journal of Chromatography & Separation Techniques

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