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(A) Negative ESI mass spectrum of glucose solution after two-hour electrolysis at AuNPHEPES electrode at 0.30 V. Peaks at m/z 179 and 195 correspond to singly deprotonated species [M− H+]− of glucose and gluconic acid, respectively. Other peaks are due to contaminants in the background solvent and were also present in the blank. (B) Tandem mass spectrum of gluconic acid electrolytic product. (C) Tandem mass spectrum of gluconic acid standard.
