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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Int J Mass Spectrom. 2017 Oct 7;427:79–90. doi: 10.1016/j.ijms.2017.09.014

Figure 2.

Figure 2

The mass spectra observed for (A) ubiquitin (8,566 Da), (B) cytochrome c (12,359 Da), and (C) myoglobin (apo 16,951 Da; holo 17,567 Da) electrosprayed from both acidic organic (pH ~3, red traces) and aqueous buffered (pH ~6.6, blue traces) solution conditions. For myoglobin, the charge states labeled “holo” correspond to ions which retain the heme group (616 Da). Note that each mass spectrum represents two overlaid traces, each of which is normalized to the maximum ion abundance (y-axis).