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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. 3.

Fig. 3

(a) ESSI-MS spectrum of a peptide mixture of bradykinin, angiotensin II and sulfated hirudin (1 : 10 : 10 by moles) at pH 3.2; and (b) DESI-MS spectrum of the peptide mixture at pH 2.0. The inset in (b) shows the CID spectrum of m/z 746.