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Analytical characteristics of the bionanosensor GhOx/nCuFe/nPt/GCE: (a) CV responses at various CHOL concentrations: (1)—0 mM, (2)—1.5 mM, (3)—3.0 mM, (4) —4.5 mM; (b,c) chronoamperograms (inserted) and calibration curves for CHOL determination at working potential–250 mV (an electrode area of 1.76 mm2).
