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Oxidation reactions in an electrospray emitter. a Oxidation of hydroquinone (hQ) to benzoquinone (bQ) in the presence of Cys-containing peptides leads to quinone-labeled peptides [106]. b Oxidation of metals (e.g., from the emitter material itself) leads to metal ions that may coordinate with peptides [113]. c Oxidation of water reduces the solvent pH, leading to higher protein charge states [121]
