282574.fig.0015a
(a)
282574.fig.0015b
(b)
282574.fig.0015c
(c)
Figure 15: Electrospray ionization mass spectra of cytochrome c (10−5 M) from solutions containing (a) 0, (b) 0.3, and (c) 0.7% m-NBA. The base solution is 47/50/3% water/methanol/acetic acid. (Reprinted with permission from Analytical Chemistry [101], Copyright 2001, American Chemical Society).