Development and validation of an LC-MSMS method for the quantitation of pacritinib; application of kinetics in rabbits.

Background: Accurate and selective LC/ESI-MSMS method development and validation for the quantitation of pacritinib is the primary goal of this study to perform kinetic studies in the healthy rabbit.

Methods: Chromatographic resolution was accomplished with a hypersil/ODS (50 mm × 4.6 mm, 3 μ) analytical C column and a mobile phase composition of 0.1% formic acid and ACN in the proportion of 25:75 with a 0.6 ml/min flow of the mobile phasic system from the analytical column. The method was employed by monitoring the established ionic transitions of m/z-473.25/98.09 for Pacritinib and 506.18/57.12 for the internal standard (Amprenavir) in multiple reaction monitoring.

Results: The calibration plot regression line was y = 0.0002× + 0.007, with a correction coefficient (r) of 0.9989. The CV outcomes for the matrix effect at low-QC and high-QC levels were 4.79% and 4.91%, respectively. The percentage average recoveries for Pacritinib in High-QC (12.70 μg/ml), MQC (8.50 μg/ml), and Low-QC (1.19 μg/ml) were 95.87%, 103.64%, and 94.32%, respectively. The obtained values were found between 2.98 and 5.07% for the QC (1.19, 8.50, and 12.70 μg/ml) samples. The established procedure was subjected to kinetics study of Pacritinib after oral administration in rabbits. C T and T of the Pacritinib tablets were 247.25 ± 3.32 ng/ml, 6.0 ± 0.03 h, and 12.24 ± 0.53 h, respectively. AUC infinity for Pacritinib tablets was 1691.74 ± 3.67 ng h/ml.

Conclusion: After oral administration of Pacritinib to healthy rabbits, pharmacokinetic characteristics were presented, and the established technique was effectively verified.