Abstract
A sensitive and specific high-performance liquid chromatographic assay for the non-peptide cholecystokinin subtype B receptor antagonist, CI-988, in human and cynomolgus monkey plasma has been developed and validated. The method involves isolation of CI-988 and internal standard by batch robotic solid phase extraction with a C18 cartridge, liquid chromatographic separation on a C18 column and quantitation by fluorescence detection. The human plasma assay is linear from 0.25 to 500 ng/mL for a 1.00-mL plasma aliquot. Assay precision for CI-988 based on human plasma quality control samples was within +/- 7.2% relative standard deviation with an accuracy of +/- 5.6% relative error. The monkey plasma assay is linear from 1.00 to 250 ng/mL for a 0.500-mL plasma aliquot. Assay precision based on monkey plasma quality control samples was within +/- 11.0% relative standard deviation with an accuracy of +/- 2.6% relative error.
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