The impact of the presence of CAF as structurally related Fig. 6.DP voltammograms demonstrating the impact of the presence ofstructurally related methylxanthine caffeine (CAF) on the current response of37.5μM TB in 0.1 M H2SO4on the miniaturized BDDE. The studied con-centration levels ratios (TB:CAF) are 1:0.1, 1:1, 1:2 and 1:3. The DPV para-meters: modulation amplitude of 100 mV, modulation time of 100 ms and scanrate of 10 mV/s.