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Bioanalytical assay for the quantification of the ALK inhibitor lorlatinib in mouse plasma using liquid chromatography-tandem mass spectrometry.
Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences 2018 April 16
A bio-analytical assay for the first third generation ALK inhibitor lorlatinib in mouse plasma was developed and validated. Ten-μl plasma samples were prepared by adding rucaparib as the internal standard and precipitation of the plasma proteins. For LC-MS/MS analysis, compounds were eluted at 0.5 mL/min and separated on a 3-μm particle-size, polar embedded octadecyl silica column by gradient elution using 0.1% of formic acid (in water) and methanol. Compounds were monitored with positive electrospray ionization using a triple quadrupole mass spectrometer in selected reaction monitoring mode. The assay was fully validated in the 2-2000 ng/mL calibration range. Within-day (8.0-11.6%) and between-day (10.0-15.0%) precisions and accuracies (99.0-113.3%) were within acceptable range. Plasma samples were deemed stable for 6 h at ambient temperature, during three freeze-thaw cycles and for 2 months at -30 °C. Finally, the new assay was applied successfully to pilot pharmacokinetic studies in male and female wild-type mice.
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