Abstract
We have developed and validated an accurate, sensitive, and robust LC–MS/MS method that determines the concentration of CRx-102 (the combination of prednisolone and dipyridamole) in human plasma. In this method, prednisolone, dipyridamole, and the combined internal standards (IS) prednisolone-d6 (IS for prednisolone) and dipyridamole-d20 (IS for dipyridamole) were extracted from 100μL human EDTA plasma using methylbutyl ether. Calibration curves were linear over a concentration range of 0.4–200ng/mL for prednisolone and 5–3000ng/mL for dipyridamole. The analytes were quantitatively determined using tandem mass spectrometry operated in positive electrospray ionization in a multiple reaction monitoring (MRM) mode. This validated method has been used successfully in clinical pharmacokinetic studies of CRx-102 in healthy volunteers.
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