A validated assay for the quantitative analysis of vatalanib in human EDTA plasma by liquid chromatography coupled with electrospray ionization tandem mass spectrometry

A sensitive and accurate method for the determination of vatalanib in human EDTA plasma was developed using high-performance liquid chromatography and detection with tandem mass spectrometry. Stable isotopically labeled imatinib was used as internal standard. Plasma proteins were precipitated and an aliquot of the Supernatant was directly injected onto a Phenomenex Gemini C18 analytical column (50 mm x 2.0 mm ID, 5.0 mu m particle size) and then compounds were eluted with a linear gradient. The Outlet of the column was connected to a Sciex API 365 triple quadrupole mass spectrometer and ions were detected in Positive multiple reaction monitoring mode. The lower limit of quantification was 10 ng/nnL (S/N approximate to 10, CV