Electrospray Ionization Mass Spectrometry: A Technique to Access the Information beyond the Molecular Weight of the Analyte

Figure 18

CID-MS/MS spectra of different protonated forms of the peptide HSDAVFTDNYTR: (a) CID of singly protonated peptide [M + H]⁺, (b) CID of doubly protonated peptide [M + 2H]²⁺, and (c) CID of triply protonated peptide [M + 3H]³⁺. (Reprinted with permission from Analytical Chemistry [157], Copyright 1993, American Chemical Society).

(a)

(b)

(c)