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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2017 Jul 11;28(10):2001–2010. doi: 10.1007/s13361-017-1732-x

Figure 1.

Figure 1

(a) Positive nESI of a solution of bovine CA II in 5 mM NH4 OAc (AA) solution, sprayed out of a theta tip with no electroosmosis. Mass spectra of the same CA II solution after electroosmosis via 100 ms of a 10 Hz square wave at (b) +/−200 V and (c) +/−230 V. The circles at the right of the spectra indicate the theta tip schematic; an aliquot of the same sample was loaded in each channel, and the lightning bolts depict the voltage applied to each side