Figure 3
(a) The calibration curve of the cathodic current vs. UA concentration in the comparison of UOx-paper/PPD/PrB-SPCE and UOx-membrane/PPD/PrB-SPCE at − 0.1 V (vs. Ag pseudo-reference electrode), respectively. (b) The current response to 500 μM UA of UOx-paper/PPD/PrB-SPCE at − 0.1 V (vs. Ag pseudo-reference electrode) compared with response to common electroactive physiological interferences including 800 μM glucose, 200 μM AA, 100 μM AP and 1000 μM LA. (c) Reproducibility of UOx-paper/PPD/PrB-SPCE with different fabrication dates, based on current response to 500 μM UA in artificial saliva at − 0.1 V (vs. Ag pseudo-reference electrode). (d) Stability of UOx-paper/PPD/PrB-SPCE based on the current response to 500 μM UA stored for 28 days at 4 °C. Error bars represent standard deviation of the mean (n = 3).
