Simultaneous determination of SU5416 and its phase I and phase II metabolites in rat and dog plasma by LC/MS/MS

SU5416. Z-3-[(2,4-dimethylpyrrol-5-yl)methylidenyl]-2-indolinone is a cytostatic substance in development as an anti-angiogenic agent. SU5416 has several phase I and phase II metabolites including SU9838, SU6595, SU6689, 5'-hydroxy glucuronide of SU5416 and 5'-acyl glucuronide of SU5416. In order to support the preclinical studies, a liquid chromatography;mass spectrometry,mass spectrometry (LC/MS/MS) method for simultaneous determination of SU5416 and its metabolites in rat and dog plasma was developed. This method is fast, simple, sensitive (LOQ = 2.0 ng/ml), reproducible and has a wide linear range (2.0-5000 ng:ml for SU5416. 2.0-2000 ng/ml for SU6689) and 2.0-1000 ng/ml for SU9838 and SU695). This method was applied to rat and dog plasma samples obtained from pharmacokinetic and toxicokinetic studies. (C) 2001 Elsevier Science B.V. All rights reserved.