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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

Scheme 3.

Scheme 3

Mechanism of reaction for methionine residues and HS2O8 to yield oxidation of (a) the sulfur atom, and (b) the carbon atom, via initial H2SO4 loss and (c) oxidation of the sulfur atom via initial SO3 loss.