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. Author manuscript; available in PMC: 2014 Mar 7.
Published in final edited form as: Analyst. 2013 Mar 7;138(5):1321–1324. doi: 10.1039/c3an36737a

Fig. 2.

Fig. 2

DESI-MS spectra of (a) ovalbumin tryptic digest and (b) β-casein tryptic digest at pH 2.0. *C indicates the protected cysteine residue. The inset in (b) shows the ECD spectrum of m/z 1042.