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Plots of logk values for rosuvastatin, metformin and N-despropyl ropinirole versus (a) the concentration of ammonium formate, and (b) the percentage of the water of the mobile phase on an XBridge®-HILIC BEH analytical column. Data have been obtained from the analysis of human plasma samples spiked with 2500 ng mL−1 metformin, 50 ng mL−1 rosuvastatin and 190 ng mL−1 N-despropyl ropinioro (ISTD).
