Figure 2.

(a) Functionalization of gold screen-printed electrodes with three different types of vancomycin-modified highly branched polymers (HB-PNIPAM-A, B, C; see Table 1) shown by increased R_ct values after polymer immobilization on electrodes that were tested before and after (with baseline, grey bars) and only after polymer attachment (without baseline, red bars) compared to the R_ct values of bare, unmodified gold electrodes (blue bars), respectively; data are presented as mean ± standard error of the mean (SEM); n = 3. (b) EIS Nyquist plot of an unmodified, bare gold electrode (blue line + symbol) and an electrode tested after functionalization with the HB-PNIPAM-Van-C polymer without an initial baseline EIS measurement (red line + symbol); the green lines show the fitted data using the Randles equivalent circuit model.