Figure 18: (A) UV-vis absorption spectra of multilayer on quartz substrate (laccase as the outmost layer) with different numbers of layers: 1–15 (curves from bottom to top). The inset shows the absorbance at 267 nm as a function of the number of layers. (B) Cyclic voltammograms of the (MWCNT/polylysine/laccase)15-modified ITO electrodes in 0.1 mol dm−3 PBS (pH 6.0), under (a) N2-saturated condition and (b) air-saturated conditions, respectively. Scan rate 0.05 V s−1 (from [19]).