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. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: J Am Soc Mass Spectrom. 2015 May 6;26(7):1103–1114. doi: 10.1007/s13361-015-1125-y

Oxidation of ARAAAKA via ion/ion reaction with peroxymonosulfate. (a) Ion/ion reaction between doubly protonated ARAAAKA and peroxymonosulfate anion, (b) activation of the ion/ion complex, (c) activation of the [M+H+O]⁺ oxidized species, and (d) further activation of the oxidized b₆ ion to further provide sequence information. Asterisks (*) indicate ammonia losses, degree signs (°) indicate water losses, and the lightning bolt ( ) indicates species subjected to CID.

Inline graphic — Oxidation of ARAAAKA via ion/ion reaction with peroxymonosulfate. (a) Ion/ion reaction between doubly protonated ARAAAKA and peroxymonosulfate anion, (b) activation of the ion/ion complex, (c) activation of the [M+H+O]⁺ oxidized species, and (d) further activation of the oxidized b₆ ion to further provide sequence information. Asterisks (*) indicate ammonia losses, degree signs (°) indicate water losses, and the lightning bolt ( ) indicates species subjected to CID.