On the amperometric detection and electrocatalytic analysis of ascorbic acid and dopamine using a poly(acriflavine)-modified electrode

Simultaneous voltammetric determination for DA, AA and NO2− based on graphene/poly-cyclodextrin/MWCNTs nanocomposite platform

“…Therefore, it is important to establish simply, rapid and sensitive methods for simultaneous detect DA, AA and NO 2 − . For this purpose, various materials have been employed to modify electrodes, such as nanoparticles, polymers, carbon nanotubes and organic redox mediator (Thiagarajan and Chen, 2007;Nien et al, 2009;Zhang et al, 2005;Palraj Kalimuthu and John, 2009). Graphene sheets (GS), a two-dimensional (2D) carbon material, have high surface area, superior conductivity and broad potential window (Stankovich et al, 2006;Novoselov et al, 2004;Geim and Novoselov, 2007).…”

Fast and Accurate Analysis of Drugs Using Amperometry Associated With Flow Injection Analysis

“…The electrochemical oxidation of ascorbic acid associated to flow systems has been the subject of many studies, employing several types of electrodes. The electrode materials include glassy carbon153 carbon electrode modified with 2,6‐dichlorophenolindophenol,154, 155 glassy carbon electrode modified with films of 3,4‐dihydroxybenzaldehyde,156 polyaniline,157 Prussian Blue,158 poly‐1‐naphthylamine,159 octacyanomolybdate‐incorporated‐poly(4‐vinylpyridine)160 and poly‐acriflavine,161 gold electrode modified with palladium162 and platinum,163 aluminum electrode modified with nickel hexacyanoferrate film,164 carbon paste electrode modified with zirconium165 and methylene blue/titanium166 and graphite modified with polyvinyl chloride/tetrathiafulvalene‐tetracyanoquinodimethane (PVC/TTF‐TCNQ) 167…”

Enzymatic Platforms for Sensitive Neurotransmitter Detection

“…The method described here was based on original polymers, which acted as a matrix for enzyme immobilization (stable matrix for a protein anchoring, which also ensured stability during measurements), detection based on an enzyme-dependent redox reaction and electrochemical measurements, and presented a highly sensitive, quick, and simple analytical procedure. However, the main advantage over the other systems known from the literature is the low detection limit in comparison with other systems [25][26][27] and excellent selectivity. The fabricated gold and platinum electrodes modified with semiconducting polymers (poly[2,6-bis(3,4-ethylenedioxythiophene)-4-methyl-4-octyl-dithienosilole], poly[2,6-bis(selenophen-2-yl)-4-methyl-4-octyl-dithienosilole)]), and laccase or horseradish peroxidase (HRP) exhibited exquisite electrochemical behavior and direct electron transfer was achieved.…”