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.