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HPLC-MS (ESI-positive ionization, 20 V) of βCs 1–3 identified in the reaction of 3-deoxyglucosone (0.1 mg/mL) with l-tryptophan (0.5 mg/mL) (pH 3.1, 110 °C, 2 h). The spectra show the (M + H)+ ions, but higher fragmentation is produced at higher fragmentation voltages.15
