Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1222949 | Journal of Pharmaceutical and Biomedical Analysis | 2011 | 6 Pages |
Abstract
A novel, sensitive and rapid liquid chromatographic-electrospray ionization mass spectrometric method was developed and validated for the determination of zofenopril and its active metabolite zofenoprilat in human plasma. The method was based on a single extraction step using methyl tert-butyl ether and did not require chemical derivatization. The chromatographic conditions were optimized; separation was performed on a phenyl-hexyl column (5 μm, 250 mm Ã 4.6 mm i.d.) with a mobile phase consisting of a solution of methanol and water (95:5, v/v) that also contained 0.1% of formic acid. A flow rate of 1.0 mL/min was used. Zofenopril, zofenoprilat and the internal standard (IS) fosinopril sodium were measured using an electrospray ion source in a positive reaction monitoring mode. Linear calibration curves were generated for zofenopril concentrations between 0.1052 and 1052 ng/mL and for zofenoprilat concentrations between 0.2508 and 2508 ng/mL. In both cases, the coefficients of determination were greater than 0.995. The extraction recovery for zofenopril was 93.5% on average. It was 92.5% for zofenoprilat. The inter- and intra-batch precision and accuracy for both zofenopril and zofenoprilat were higher than 14%. The method was applied to measure the concentrations of zofenopril and zofenoprilat in plasma samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Yuan Jiang, Fang Yan, Bin Di, Fang Feng, Linjun You, Lili Huang, Juan Lu,