Fig. 4. (a) Amperometric i–t curves of the biosensor platform based on the detection of different lactate concentrations. (b) Lactate calibration curve of the biosensor. (c) The data from the working electrode and the blank electrode were measured, which demonstrated the linearity and (d) the selectivity of the biosensor. The concentrations of the samples were 0.43 mM lactate, 0.43 mM lactate and 0.25 mM glucose, and 0.43 mM lactate and 0.1 mM uric acid, respectively.
