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Glucose-dependent potential-responses of glucose oxidase modified nanosensor in (A) 10 mM PBS (pH 7.0) and (B) cell media (DMEM). The bare nanopipette did not show concentration-dependent potential-response changes, demonstrating the specificity of GOx-modified nanopipette. The potential changes recorded at a fixed current of 1 nA and bandwidth of 1 kHz. The error bars represent the standard deviation for n = 3 replicates.
