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. Author manuscript; available in PMC: 2015 Apr 13.
Published in final edited form as: Int J Mass Spectrom. 2012 Jul 1;325-327:161–166. doi: 10.1016/j.ijms.2012.06.006

Figure 4.

Figure 4

Mass spectra of lysozyme following the HPLC separation obtained by (a) ESSI analysis after splitting the eluent (split ratio: 100:1), (b) DESI analysis of the jet eluent using the spray solvent of CH3OH/H2O/HOAc (50:50:1 by volume), (c) DESI analysis of the jet eluent using the spray solvent of CH3OH/H2O/HOAc (50:50:1 by volume) containing 50 mM m-NBA, and (d) DESI analysis of the jet eluent using the spray solvent of CH3OH/H2O/HOAc (50:50:1 by volume) containing 200 mM sulfolane. The asterisk labeled peaks in (c) probably correspond to the protein adduct ions with m-NBA.