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. Author manuscript; available in PMC: 2014 Aug 18.
Published in final edited form as: Chemistry. 2012 Mar 16;18(17):5374–5383. doi: 10.1002/chem.201103534

Figure 4.

Figure 4

193 nm UVPD of (a) [RAAYAHAFAA + 2H]+• (m/z 1050, generated via charge reduction from ETD of the doubly deprotonated peptide) and (b) [RAAYAHAFAA + H]+ (m/z 1049, generated directly upon ESI of the peptide), and CID of (c) [RAAYAHAFAA + 2H]+• (m/z 1050, generated via charge reduction from ETD of the doubly deprotonated peptide) and (d) [RAAYAHAFAA + H]+ (m/z 1049, generated directly upon ESI of the peptide). Ammonia loss are denoted by an asterisk (*). Radical product ions are denoted with •. The mixture of an+1 and an+2 species are symbolized by an+1(2). 193 nm UVPD of (e) [AAFAHAYAAR + 2H]+• (m/z 1050, generated via charge reduction from ETD of the doubly deprotonated peptide) and (f) [AAFAHAYAAR + H]+ (m/z 1049, generated directly upon ESI of the peptide), and CID of (g) [AAFAHAYAAR + 2H]+• (m/z 1050, generated via charge reduction from ETD of the doubly deprotonated peptide) and (h) [AAFAHAYAAR + H]+ (m/z 1049, generated directly upon ESI of the peptide).