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. Author manuscript; available in PMC: 2009 Sep 22.
Published in final edited form as: Rapid Commun Mass Spectrom. 2009 Jun;23(11):1719–1726. doi: 10.1002/rcm.4066

Figure 3.

Figure 3

FT-ICR MS (a,b) and ion trap MS/MS (c,d) spectra of a peptide from digested BCCL1 cross-linker treated CA from the un-fractionated cross-linking reaction (a,c) and the eluted fraction (b,d). The monoisotopic masses of precursor ions of the peptide from the un-fractionated and eluted samples were detected at m/z = 591.80255 (theoretical m/z = 591.80243) and m/z = 599.79989 (theoretical m/z = 599.79974), respectively (a,b). The monoisotopic mass increment (15.99468 Da) corresponded precisely to the mass of molecular oxygen (15.99491 Da). Mass measurement errors are less than 1 ppm on the FT-ICR MS. Ion trap MS/MS spectra of [M+2H]2+ ion of the peptide from the un-fractionated reaction (c) and eluted fraction (d). Corresponding b and y ions are indicated.