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. Author manuscript; available in PMC: 2014 Nov 12.
Published in final edited form as: J Am Soc Mass Spectrom. 2011 Jul 6;23(4):577–593. doi: 10.1007/s13361-011-0190-0

Figure 8.

Figure 8

CID- and ETD-MS/MSanalysis of phosphopeptide no. 27 (LFTGHPEpSLER) differentially labeled with D6-light DMBNHS and D6-heavy DMBNHS at a ratio of 1:1. (A) CID-MS/MS of the [M+ + 2H]3+ precursor ion. The inset shows an expanded m/z region around the observed exclusive S(CH3)2 and S(CD3)2 neutral loss product ions. (B) ETD-MS/MS of the [M+ + 2H]3+ precursor ion. (C) ETD-MS/MS of the [M+ +H]2+ precursor ion