Electrochemical Preparation of Poly(acriflavine) Film‐Modified Electrode and Its Electrolcatalytic Properties Towards NADH, Nitrite and Sulfur Oxoanions

Abstract

Electrochemical polymerization of acriflavine (AF) was carried out onto glassy carbon electrodes (GCE) from the aqueous buffer solution containing 1.5 Â 10 À3 M AF monomer (pH 3.5) which produced a thin electrochemically active film. This is noted as poly(AF) film modified electrodes (PAF/GCE). This modified electrode was shown a stable reversible redox couple centered at þ 0.22 V in pH 3.5 buffer solutions. PAF/GCE was found to be more stable in acidic solutions and its formal potential was found to be pH dependent with a slope close to À 60 mV/pH. The electrochemical deposition kinetics of poly(AF) onto gold coated quartz crystal was studied by using electrochemical quartz crystal microbalance (EQCM) combined with cyclic voltammetry (CV). PAF/GCE was found be good mediator for electrochemical oxidation of reduced nicotinamide adenine dinucleotide (NADH) in pH 5 buffer solutions. The electrocatalytic oxidation of SO were carried out at PAF/GCE electrode in acidic aqueous solutions. The electrocatalytic oxidation of NADH was also investigated by using amperometric method.

Electroanalysis of NADH Using Conducting and Redox Active Polymer/Carbon Nanotubes Modified Electrodes-A Review

“…PAF/GCE was found be good mediator for electrochemical oxidation of NADH in pH 5 buffer solutions. The anodic current increased linearly with the additions of NADH concentration over the range from 80 to 720 μM [97]. …”

Acriflavine immobilized onto polyethyleneimine-wrapped carbon nanotubes/gold nanoparticles as an eletrochemical sensing platform

“…In second type, electropolymerization of acriflavine onto electrode surface was also performed by holding the potential at +0.8 V for 10 min in the buffer solution containing 1.5× 10 −3 M acriflavine. 5 The cyclic voltammogram was characterized by one reversible redox couple, with the formal potential (E • = (E pa + E pc )/2) occurring at 0.2 V (vs. Ag/AgCl). The reversible redox couple was attributed to the reduced and oxidized forms of PAF.…”

“…These results confirmed that the oxidation of acriflavine results PAF film deposition onto Au/AuNPs/PEI/CNT-COOH. 5 Cyclic voltammograms of PAF onto bare Au (a), Au/PEI (b),Au/AuNPs/PEI (c) and Au/AuNPs/PEI/ CNT-COOH (d) in 0.1 M acetate buffer solution (pH 4) at a scan rate of 50 mVs −1 were carried out. As can be seen in figure 4, a pair of weak redox peaks were observed when Au/PAF and Au/PEI/PAF electrodes were used (curves a and b) compared to the other modified electrodes (curves c and d).…”

“…Nevertheless, poly(acriflavine) (PAF) is rarely studied. In the literature, 5,6 the PAF film was proposed to sense nicotinamide adenine dinucleotide (NADH), nitrite and sulfur oxoanions. Also, PAF film entrapped flavin adenine dinucleotide (FAD) was used to catalyze NAD + .…”

Electrocatalytic oxidative determination of reserpine at electrochemically functionalized single walled carbon nanotube with polyaniline

“…Polymer films modified electrodes [1][2][3][4][5][6][7][8][9] have been receiving great attention recently due to their wide applications in the * Corresponding author. field of chemical sensors and biosensors.…”