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. 2015 Dec 28;88(3):1785–1793. doi: 10.1021/acs.analchem.5b04051

Figure 2.

Figure 2

Total-ion-current chromatogram of the HILIC (a) and RPLC (b) analysis of Agnique PE TSP 16A. The colors of the boxes differentiate three different classes of compounds present in this sample. Red indicates the ditri styrene ethoxylate, blue impurities containing two units of the ditri styrene diethoxylate and green the ditri styrene ethoxylate phosphate. Conditions: (a) flow rate: 1 mL/min mobile phase A: 98% ACN 2% 12.5 mM ammonium acetate; Mobile phase B: 12.5 mM ammonium acetate. Linear gradient 0 to 50% B in 20 min. (b) Flow rate = 1 mL/min, mobile phase A = 25 mM ammonium acetate + 1% BuOH, mobile phase B = MeOH + 1% BuOH; linear gradient 50–100% B in 5 min. Mass spectrometry conditions are reported in section S2 of the Supporting Information.