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. Author manuscript; available in PMC: 2009 Jan 27.
Published in final edited form as: Anal Chem. 2005 Aug 15;77(16):5370–5379. doi: 10.1021/ac050511+

Figure 6.

Figure 6

Influence of solvent composition in the extent of multiple charging of protein ions. Panel (A) shows ESI mass spectra of a recombinant form of human serum transferrin acquired in 10 mM methyl ammonium acetate (top) and ammonium acetate (bottom) solutions, whose pH was adjusted to 7.0. Panel B shows the charge-surface correlation for a set of proteins whose ESI mass spectra were acquired in 10 mM methyl ammonium acetate solution acetate (gray dots). The data acquired for the same proteins in 10 mM ammonium acetate solution. A subset of the data presented in Figure 2 is shown here with open circles for comparison.