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A simple, selective and sensitive LC–MS-MS method has been developed and validated to simultaneously quantify zofenopril and its active metabolite zofenoprilat in human plasma, using diazepam as internal standard. 1,4-Dithiothreitol was used as a reducer to release and stabilize the thiol group of zofenoprilat from dimer and mixed forms with endogenous thiols in the treatment of plasma samples. After a liquid–liquid extraction with methyl  tert -butyl ether under acidic conditions, the post-treatment samples were analyzed on an Agilent ZORBAX Eclipse XDB-C 8  column interfaced with a triple-quadruple tandem mass spectrometer using positive electrospray ionization. A solution of methanol and 0.1% formic acid solution (85 : 15, v/v) was used as the isocratic mobile phase with a flow rate of 0.2 mL/min. The method was validated to demonstrate the specificity, lower limit of quantitation, accuracy and precision of measurements. The validated LC–MS-MS method has been successfully applied to study the pharmacokinetics of zofenopril calcium in healthy Chinese volunteers.

journal of chromatographic science

Determination of Zofenopril and Its Active Metabolite in Human Plasma Using High-Performance Liquid Chromatography Combined With a Triple-Quadruple Tandem Mass Spectrometer