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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2017 May 11;28(9):1765–1774. doi: 10.1007/s13361-017-1672-5

Table 1.

Neutral side chain losses from protein radical cations23,33

Amino acid residue Radical loss to produce Dha MW Even-electron loss MW
Leucine C3H7• 43.05 C4H8 56.06
Asparagine CONH2• 44.01 CH2CONH2 58.03
Lysine C3H8N• 58.07 C4H9N 71.07
Glutamine NH2COCH2• 58.03 NH2COC2H4 71.04
Glutamic acid CH3COO• 59.01 C2H4COO 72.02
Methionine CH3S• 61.01 C3H6S 74.02
Arginine C3H8N3• 86.07 C4H9N3 99.09