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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: J Mass Spectrom. 2015 Feb;50(2):418–426. doi: 10.1002/jms.3548

Figure 1.

Figure 1

A simplified outline of the radical generation methods demonstrated in this work. (a) Collisional activation of azo functionalities in electrostatic complexes, (b) collisional activation of azo functionalities combined with covalent modification via NHS reactivity, (c) UVPD of C-I bonds in an electrostatic complex, (d) UVPD of C-I bonds in an R group that has been covalently bound to a peptide via NHS chemistry. Yellow circles indicate the reagent on which the radical is initially generated while the blue squares represent the peptide that eventually undergoes RDD.