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. Author manuscript; available in PMC: 2006 Jan 20.
Published in final edited form as: Anal Chem. 2004 Jul 15;76(14):3944–3950. doi: 10.1021/ac049724

Figure 1.

Figure 1

ESI mass spectra of cytochrome c (10−5 M) ions formed from aqueous solutions containing (a) 0, (b) 1.0 × 10−3, (c) 1.0 × 10−1, and (d) 8 M ammonium acetate. In the analyte ions that have sodium adducts, each sodium cation replaces a proton; i.e., the net increase in mass is 22 Da per sodium ion adducted.