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(A) Interference test of CQDs/Cu2O-modified GCE electrode in 0.1 M NaOH at +0.55 V with 100 µM glucose in the presence 500 µM dopamine (DA), uric acid (UA), ascorbic acid (AA), fructose, galactose; (B) current response to the addition of serum; (C) UV/Vis spectra of different concentrations of glucose as well as of the serum samples (ten times diluted) together with calibration curve (D).
