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. 2014 Apr 18;9(4):e94955. doi: 10.1371/journal.pone.0094955

Figure 4. Representative chromatograms of control drugs, ephedrine and pseudoephedrine.

Figure 4

A, Control drugs were eluted from β 2-AR column using 20 mM phosphate buffer (pH 7.4) as mobile phase at 0.2 mL/min. Non-retained peaks: sodium nitrite, terazosin, esmolol. Retained peaks: salbutamol, clorprenaline, tobuterol, bambuterol (left to right); B, Ephedrine eluted from β 2-AR column when the mobile phase containing ephedrine at different concentration (from right to left: 4, 8, 12, 20, 24, 30 and 34 µM); C, Pseudoephedrine eluted from β 2-AR column when the mobile phase containing ephedrine at different concentration (from right to left: 2, 4, 8, 12, 16, 24 and 30 µM).