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UPLC-ESI/MS2 chromatograms of Cys34 peptide adducts recovered from HONH-4-ABP-modified SA following digestion with trypsin/chymotrypsin (left panel) and corresponding product ion mass spectra of (A) LQQC*PFEDHVK (C-[S=O]-4-ABP) sulfinamide ([M+3H]3+ at m/z 509.6), (B) LQQC*PFEDHVK (C-[SO2]-4-ABP) sulfonamide ([M+3H]3+ at m/z 514.9), (C) LQQC*PF (C-[S=O]-4-ABP) sulfinamide ([M+H]+ at m/z 918.4, and (D) LQQC*PF (C-[SO2]-4-ABP) sulfonamide ([M+H]+ at m/z 934.4).
