Metabolic profile of <italic>Kudiezi</italic> injection in rats by UHPLC coupled with Fourier transform ion cyclotron resonance mass spectrometry.

Abstract: In this study, a reliable and sensitive ultra‐high performance liquid chromatography coupled with fourier transform ion cyclotron resonance mass spectrometry method was developed for the systematic study of the metabolic profile of <italic>Kudiezi</italic> injection in rat plasma, bile, urine, and feces after intravenous administration of a single dose. The chromatographic separation was performed on an Agilent Eclipse Plus C18 column (4.6 mm × 50 mm, 1.8 μm) and the identification of prototype components and metabolites was achieved on a Bruker Solarix 7.0 T ultra‐high resolution spectrometer in negative ion mode. Results indicated that a total of 76 constituents including 29 prototype compounds and 47 metabolites (10 phase I metabolites and 37 phase II metabolites) were tentatively identified. And the metabolic pathways of these prototype compounds including hydroxylation, dehydrogenation, glucuronidation, and sulfate conjugation. In conclusion, the developed method with high resolution and sensitivity was effective for screening and identification of prototypes and metabolites of <italic>Kudiezi</italic> injection in vivo. Moreover, these results would provide significant information for further pharmacokinetic and pharmacological research of <italic>Kudiezi</italic> injection in vivo. [ABSTRACT FROM AUTHOR]