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. Author manuscript; available in PMC: 2007 May 2.
Published in final edited form as: J Am Soc Mass Spectrom. 2006 Nov 27;18(3):493–501. doi: 10.1016/j.jasms.2006.10.019

Figure 2.

Figure 2

Low energy ESI-FTICR-MS/MS spectra of cysteine-containing peptide (SEVAHRFKC) labeled with 3-maleimidopropionic acid. The sulfur in the side-chain thio-ether residue is converted to sulfoxide by oxidation. The ions at m/z 631.2848 correspond to [M+2H]2+ ions of oxidized modified peptides and were isolated in the quadrupole and subjected to different collisional trap voltage settings. Mass spectra shown were acquired with −3V, −6V, −12V and −15V (A, B, C, D).