New electrode architectures based on poly(methylene green) and functionalized carbon nanotubes: Characterization and application to detection of acetaminophen and pyridoxine

Poly(thionine)-carbon nanotube modified carbon film electrodes and application to the simultaneous determination of acetaminophen and dipyrone

“…Regarding the Warburg element, there are small differences in the diffusional resistance; however, the diffusional time, τ, is increasing with addition of modifiers, as expected. The EIS spectra were similar for the electrodes modified with both CNT and PTH, as previously observed for other poly(phenazine)/CNT combinations [34,36]; the results obtained here indicate PTH/MWCNT/CFE as better electrocatalyst, since lower values of charge transfer resistance and diffusional time were obtained, compared with MWCNT/PTH/CFE.…”

“…It is also noticeable that at MWCNT/PTH/CFE, the polymer peaks are less well defined than at PTH/CFE and PTH/MWCNT/CFE, due to the fact that CNT cover the polymer. In all cases, the anodic and cathodic peak current density increases linearly with the square root of scan rate, indicating a diffusion-controlled process, attributed to the rate determining process being insertion or extraction of counterions from solution into the polymer structures, as previously observed with other poly(phenazines) [35], as well as with CNT/polyphenazines [36]. For PTH/CFE (Fig.…”

“…For this modified electrode architecture, the highest sensitivity was achieved at MWCNT/PTH/CFE (Table 2). This behaviour was also observed in [36], with CNT and poly(methylene green) modified electrodes. The explanation is that considering that the oxidation of ACOP occurs at the surface of the polymer redox mediator, in fixed-potential amperometry, there is enough time for substrate to diffuse through CNT and reach PTH, some accumulation also occurring within the CNT layer.…”

A Glucose-Responsive Enzymatic Electrode on Carbon Nanodots for Glucose Biosensor and Glucose/Air Biofuel Cell

“…are presented in Figure 2(B). As shown in this figure, the potential for NADH oxidation at the polyMG-CNDs/GC electrode was observed at −0.10 V, which has a good agreement with the value reported previously [27]. These results indicate that the presence of polyMG-CNDs resulted in a substantial decrease of the overpotential to about 650 mV for NADH oxidation at conventional bare GC electrode.…”

RETRACTED: Bimetallic magnetic nanoparticle as a new platform for fabrication of pyridoxine and pyridoxal-5′-phosphate imprinted polymer modified high throughput electrochemical sensor

“…This made the detection of vitamin B 6 very important both in the supplements as well as in whole blood/serum or plasma samples. In the literatures, several methods have been reported for the estimation of Py and PLP, like high performance liquid chromatography (HPLC; Marzall et al, 2005), capillary zone electrophoresis (Crevillen et al, 2008), spectrophotometry and fluorimetry (Asadpour-Zeynali and Bastami, 2010;Llorent-Martinez et al, 2006), optical (Koneswarana and Narayanaswamy, 2015) or electrochemical detection (Barsan et al, 2015;Razmi and Mohammad-Rezaei, 2010;Fonseca et al, 2011;Nie et al, 2013Nie et al, , , 2014 methods require expensive, sophisticated and time-taking instrumentation. Due to the necessity of their detection, several commercial Enzyme-linked immunosorbent assay (ELISA) and normal detection kits are also available in the market for Py and PLP determination.…”