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1.
Scheme 1

Scheme 1. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

Entire side chain loss from z• ions via gamma hydrogen abstraction.

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
2.
Scheme 3

Scheme 3. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

Partial side chain loss from z• ions via alpha hydrogen abstraction (through-bond, 3a and through-space, 3b).

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
3.
Scheme 2

Scheme 2. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

Entire side chain loss from z• ions via gamma hydrogen abstraction involving aromatic amino acids.

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
4.
Scheme 4

Scheme 4. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

Postulated mechanisms for the formation of internal fragments z8-a9 (4a), z8-a9• and z8-c9 (4b) via beta hydrogen abstraction in ECD of the βB2 crystallin peptide (4-14).

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
5.
Figure 3

Figure 3. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

ECD spectrum of the deamidated form of βB2 crystallin peptide (4-14). Peak labeling follows the same convention as in . The cleavage pattern is shown as the inset.

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
6.
Figure 2

Figure 2. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

ECD spectrum of amyloid β peptide (25-35). Peak labeling follows the same convention as in . The cleavage pattern is shown as the inset. (Reprinted with permission from reference [].)

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
7.
Figure 4

Figure 4. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

ETD spectra of the deamidated form of βB2 crystallin peptide (4-14) generated from 2+ charge state (a) and 3+ charge state (b). * represents two fluoranthene molecules. Side chain loss means loss from the charge-reduced molecular ions. Cleavage patterns are shown as the insets.

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.
8.
Figure 1

Figure 1. From: Charge remote fragmentation in electron capture and electron transfer dissociations.

ECD spectrum of αA crystallin peptide (1-11). * represents the electronic noise peak or salt adducts, ω represents the harmonic peaks. Peaks marked with “-amino acid residue” represent the entire side chain losses, and the partial side chain losses are represented by the molecular formulas of the departing group(s). Side chain loss means loss from the charge-reduced molecular ions. The cleavage pattern is shown as the inset.

Xiaojuan Li, et al. J Am Soc Mass Spectrom. ;21(4):646-656.

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