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The gas-phase oxidation of doubly protonated peptides is demonstrated here using ion/ion reactions with a suite of reagents derived from persulfate. Intact persulfate anion (HS2O8–), peroxymonosulfate anion (HSO5–), and sulfate radical anion (SO4–•) are all either observed directly upon negative nanoelectrospray ionization (nESI) or easily obtained via beam-type collisional...
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