Figure 3. (A) Chronoamperometric response of the 3D-printed CP electrode for increasing glucose concentration (1–100 mM). (B) Corresponding calibration curve measured for increasing glucose concentration (1–100 mM).
Furthermore, as the glucose level of the cell culture medium has a range of 4.5 g/L (~25 mM), the 3D-printed glucose sensor designed in this study can respond to glucose changes in the culture medium while culturing and testing. As can be seen from Fig. 3B, the CA graphs for CP electrodes coated with Nafion/MWCNT/GOx were linear for glucose measurements in the range of 1–100 mM (squared correlation coefficient R2 = 0.9813). The correlation between glucose concentration and current was demonstrated by the linear results for different glucose concentrations by averaging currents from 3-30 s, thus indicating that the designed 3D sensor has a stable measurement potential for glucose concentrations of 1–100 mM.