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. Author manuscript; available in PMC: 2014 Feb 3.
Published in final edited form as: Chem Commun (Camb). 2012 Dec 20;49(10):947–965. doi: 10.1039/c2cc36577d

Fig. 6.

Fig. 6

CID product ion spectra of the +19 charge state of porcine elastase (a) prior to and (b) after proton transfer ion/ion reactoins. Perfluoro-1,3-dimethylcyclohexane (PDCH) anions were used as proton transfer reagents and a 300 ms reaction time was used in b.Reprinted with permission from ref. 48. Copyright 2003 John Wiley & Sons, Ltd.