Seeking a reliable electrode for the monitoring of the hydrogen peroxide reduction in the presence of antioxidants

Modified CUPRAC method with electrochemical detection for the determination of antioxidant capacity of gallic acid

“…The ratio between the concentrations of antioxidants that lead to a given percentage of decrease (usually, 10%) is equal to the ratio of the AOCs [10,12,[18][19][20]. The ratio between the AOCs of gallic acid and ascorbic acid obtained from the variations shown in Figure 6 is 1.9.…”

“…These measurements are carried out under non-physiological conditions. Carbon electrodes modified with conducting phenazine polymers and metal nanoparticles were also proposed [12][13][14].…”

Evolution of Pt and Ag nanoparticles composites with polyphenazines onto ITO electrodes during the oxidation of H2O2 with ascorbic acid

“…In the case of the poly-neutral red (PNR) deposition, 10 mg of neutral red were added to 40mL of 0.5 M H2SO4. The 6 electropolymerization potential range was from 1.3V to -0.5V and the scan rate was set at 50 mV s -1 for 10 cycles [10].…”

“…Prior to platinum deposition on the ITO electrodes, the surface has to be modified with polyphenazines. Polymerization of polyphenazines on ITO was carried out by cyclic voltammetry following the electropolymerization conditions previously reported in the literature [10,20] and 7 summarized in the previous section. Figure 2 shows the voltammograms recorded in the course of the electropolymerization.…”

“…Very recently mercury has been restricted by health authorities and radicals measurements are performed far from physiological conditions. In a previous work, electrodes modified with conducting polymers and electrodeposited platinum nanoparticles were built [10].…”