Preparation Of Poly Sulfanilic Acid Modified Electrode In Electroanalytical Chemistry,

Poly(p-aminobenzene sulfonic acid) (PABSA) has attracted increasing attention for its good stability, high conductivity and electroactivity in broad pH band. Carbon nanotube(CNT) has the unique properties like high electrical conductivity, high specific surface area, high stability. It can promote electron transfer as electrode modifies. The electrochemical activity of flavonoids on the poly(p-aminobenzene sulfonic acid) modified electrode, the synergistic catalyst effect of CNT and poly(p-aminobenzene sulfonic acid) to uric acid and the electrochemical behavior of silver doped poly(p-aminobenzene sulfonic acid) modified electrode have been researched in this work.A PABSA modified glassy carbon electrode was fabricated and the electrochemical behavior of rutin and quercetin was investigated at it, respectively. Rutin and quercetin can effectively accumulate and cause a sensitive anodic peak. Flavonoids can be adsorbed to the polymer surface throughπ-πstacking between the aromatic rings and the dimers, causing an increasing signal. The charge transfer coefficient (α) and the electrode reaction rate constant (ks) were calculated. Under optimized conditions, the proposed method has been successfully applied to the determination of compound rutin tablets and quercetin in hydrolysate product of rutin.A PABSA/CNT composite-modified glassy carbon electrode was fabricated, in which the electrochemical behaviors of uric acid (UA) and ascorbic acid (AA) were investigated. In comparison with PABSA and CNT single layer modified electrodes, the composite-modified electrode had superior electrocatalytic activity. A dramatic enhancement of the peak current and a peak to peak separation of 337 mV was observed. The dimers interacted with the CNT byπ-πstacking and the sensitivity and selectivity of the modified electrode was increased. This indicated that the composite possessed the properties of each component with a synergistic effect.A silver doped PABSA modified electrode was prepared by CVs. The electrochemical behavior of H2O2 was studied by it. In a pH 7.0 PBS, a sensitive reductive peak was observed. The method was applied to the determination of H2O2 in milk with satisfactory results.