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. Author manuscript; available in PMC: 2008 Feb 15.
Published in final edited form as: Anal Biochem. 2006 Dec 4;361(2):263–272. doi: 10.1016/j.ab.2006.11.018

Figure 5.

Figure 5

Product ion spectrum of DFP-labeled human albumin peptide 575.4. DFP-labeled albumin was digested with trypsin and infused into the Q-Trap mass spectrometer. The singly charged parent ion of 575.4 m/z has the sequence YTK and has the diisopropylphosphate group covalently bound to tyrosine. Fragment masses and their corresponding structures are shown. In addition to information on the DFP-YTK peptide, fragments from a second albumin peptide (LVNEVTEFAK, doubly protonated) can be extracted from the fragmentation information.