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An information‐rich on‐target performic acid oxidation method, which is compatible with alkylation for differentiation of free cysteine versus disulfide‐containing peptides, is described. On‐target oxidation is achieved using performic acid vapor to oxidize disulfide‐containing peptides and/or small proteins on the matrix‐assisted laser desorption/ionization (MALDI) sample deposits. The on‐target...
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