Metabolite profiling of L-isocorypalmine in rat urine, plasma and feces after oral administration using high performance liquid chromatography coupled to Fourier transform ion cyclotron resonance mass spectrometry.

L-isocorypalmine, an active alkaloid compound isolated from Rhizoma Corydalis yanhusuo, has been reported to possess biological activity for treating cocaine use disorder. A high performance liquid chromatography coupled to Fourier transform ion cyclotron resonance mass spectrometry method was established for identification of the metabolites of L-isocorypalmine in urine, plasma and feces samples of rats after a single intragastric gavage of L-isocorypalmine at a dose of 15 mg/kg. As a result, a total of twenty-one metabolites (six phase І metabolites and fifteen phase II metabolites) were detected and tentatively identified by MS data and fragment ions from MS/MS spectra. All metabolites were present in the urine samples, nine metabolites were found in the plasma samples and three metabolites were found in the feces samples. Results indicated that metabolic pathways of L-isocorypalmine included oxidation, dehydrogenation, demethylation, sulfate conjugation and glucuronide conjugation. In addition, glucuronidation was the major metabolic reaction. Results of this investigation could provide significant experimental basis for efficacy, safety and action mechanism of L-isocorypalmine, which will be advantageous to new drug development of treating cocaine addiction. This article is protected by copyright. All rights reserved.