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. Author manuscript; available in PMC: 2008 Oct 6.
Published in final edited form as: J Am Soc Mass Spectrom. 2006 Aug 4;17(10):1469–1479. doi: 10.1016/j.jasms.2006.06.027

Figure 1.

Figure 1

ESI mass spectra of bovine ubiquitin from 10−5 M solutions consisting of (a) 49.5/49.5/1, by volume water/methanol/acetic acid, (b) 49.9/49.9/0.2 water/methanol/acetic acid, and (c) 200 mM ammonium bicarbonate in water. ECD mass spectra of isolated ubiquitin 6+ for solutions (a–c) are shown in (d–f), respectively. The peaks in (a–c) are (ubiquitin + nH)n+ where n is the charge as indicated in the figure. In (d–f), the residual precursor ion peak and reduced molecular ion peaks capturing one and two electrons are labeled. Fragment ions below m/z 1300 are not shown.