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. Author manuscript; available in PMC: 2013 Apr 6.
Published in final edited form as: J Chromatogr A. 2012 Jan 9;1232:266–275. doi: 10.1016/j.chroma.2011.12.100

Fig. 7.

Fig. 7

Extracted ion chromatograms and mass spectra of doubly charged precursor ions of #EGYY$GYTGAFR (# represents light or heavy N-dimethyl label and $ indicates 4-formylbenzoyl tag) at m/z 729.82 (light) and m/z 732.84 (heavy) mixed in a theoretical ratio of (A) 0.33:1, (B) 1:1, and (C) 1:0.33 (light to heavy, respectively). The experimental ratios were calculated from the area of extracted ion chromatograms. (D) CID-MS/MS spectra of [M+2H]2+ ions of differentially labeled #EGYY$GYTGAFR after SPAER enrichment.