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Chromatographia

, Volume 71, Issue 11–12, pp 1007–1014 | Cite as

Simultaneous Analysis of Zofenopril and Its Active Metabolite Zofenoprilat in Human Plasma by LC–ESI-MS Using Pre-Column Derivatization with p-Bromophenacyl Bromide

Original

Abstract

Zofenoprilat is an active metabolite of zofenopril, which is very unstable in plasma because of oxidative degradation of its thiol group. In this method, p-bromophenacyl bromide was used as derivatization reagent, immediately after plasma separation, to react with the free thiol group of zofenoprilat and form the derivative zofenoprilat-p-BPB. After acidification with 50% acetic acid, the derivatized plasma samples were extracted with methyl tert-butyl ether and separated on a C18 column with 40:60 (v/v) 10 mM ammonium acetate buffer solution containing 0.1% formic acid–acetonitrile as mobile phase. Calibration plots were linear over the concentration range 1–500 ng mL−1 for zofenopril and 2–1,800 ng mL−1 for zofenoprilat. The method was successfully used to study the bioavailability of zofenopril calcium capsules relative to that of zofenopril calcium tablets in healthy Chinese volunteers.

Keywords

Column liquid chromatography Mass spectrometry Zofenopril Zofenoprilat p-Bromophenacyl bromide Derivatization Pharmacokinetics 

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Copyright information

© Vieweg+Teubner Verlag | Springer Fachmedien Wiesbaden GmbH 2010

Authors and Affiliations

  1. 1.Department of Pharmaceutical AnalysisChina Pharmaceutical UniversityNanjingChina
  2. 2.Organization for State Drug Clinical TrialDermatology Hospital Affiliated to Chinese Academy of Medical SciencesNanjingChina

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