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potassium edta plasma sunitinib plasma sample concentration method rgb -286638 su 12662 potassium -286638 solution qc samples analysis aliquots extraction / journal acetonitrile light bioanalytical ifosfamide kinase urine patient phase ms /ms response −70 ◦ c effect cancer quantitation freeze –thaw cycles bioanalytical method validation bioanalytical method journal matrix effect validation inhibitor ambient temperature assay precision metabolite su 12662 10 ◦ c 1 mg /ml level bruijn plasma samples response netherland administration calibration rgb -286638-d water temperature table metabolite accuracy drug administration 0.200 ng /ml 2.00 ng /ml 37 ◦ c compound phase b matrix speci fied 0.250 ml /min sunitinib-d 10 acidi study infusion stability n-desethyl acidi fied within-run rgb 286638 ionization sunitinib-d <−70 ◦ c 8 ◦ c su 12662 concentrations qc ur 2 tert-butyl methyl ether
