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Effect of the stacking time on the CE separation efficiency: stacking time, (A) 90, (B) 80, and (C) 70 s; LC buffer, 10 mM lithium formate, pH 2.5/acetonitrile (70:30 v/v); CE buffer, 150 mM lithium acetate, pH 4.75. Other conditions and peaks identities as in Figure 4.
