Figure 4.

Ion chromatogram (SIM mode) of a blank human plasma sample (black line) overlaid with ion chromatograms (SIM mode) of calibration spiked plasma samples at 2 ng mL⁻¹ (solid line) and 20 ng mL⁻¹ (dashed line) of rosuvastatin (blue line), 100 ng mL⁻¹ (solid line) and 1000 ng mL⁻¹ (dashed line) of metformin (red line) and 190 ng mL⁻¹ of ISTD (green line).