Fig. 3. (A) Cyclic voltammograms (3 mm diameter glassy carbon electrode; scan rate 0.1 V s−1) for catechin bound into a PIM-EA-TB film (immobilisation in (i) 0.001, (ii) 0.003, (iii) 0.01, (iv) 0.1, (v) 0.3 mM catechin in 0.1 M phosphate buffer pH 2 for 12 h) and immersed into 0.1 M phosphate buffer pH 2. (B) Plot of peak current versus logarithm of catechin concentration. (C) As before, but immobilisation in (i) 0.003, (ii) 0.01, (iii) 0.03, (iv) 0.1, (v) 0.3 mM catechin in 0.1 M phosphate buffer pH 6 for 12 h. (D) Plot of peak current versus logarithm of catechin concentration.
