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Impact of the concentration of ammonium formate in the mobile phase on the MS signal of (a) metformin and (b) rosuvastatin. 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).
