Preparation of Tetraheptylammonium Iodide-Iodine Graphite-Multiwall Carbon Nanotube Paste Electrode: Electrocatalytic Determination of Ascorbic Acid in Pharmaceuticals and Foods

Noroozifar, Meissam; Khorasani-Motlagh, Mozhgan; Tavakkoli, Hamed

doi:10.2116/analsci.27.929

Cited by 13 publications

(5 citation statements)

References 31 publications

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“…where E p is oxidation potential, E p1/2 is the half-wave oxidation potential, and D 0 is the diffusion coefficient [49]. As shown in Table S1, K s values were determined as 2.00 × 10 −3 , 4.58 × 10 −3 , 1.16 × 10 −3 , 1.12 × 10 −2 , and 2.61 × 10 −3 cm s −1 for UA, G, A, T, and C, respectively.…”

Section: Chronoamperometrymentioning

confidence: 99%

Simultaneous Determination of Four DNA bases at Graphene Oxide/Multi-Walled Carbon Nanotube Nanocomposite-Modified Electrode

et al. 2020

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In this study, we developed a modified glassy carbon electrode (GCE) with graphene oxide, multi-walled carbon nanotube hybrid nanocomposite in chitosan (GCE/GO-MWCNT-CHT) to achieve simultaneous detection of four nucleobases (i.e., guanine (G), adenine (A), thymine (T) and cytosine (C)) along with uric acid (UA) as an internal standard. The nanocomposite was characterized using TEM and FT-IR. The linearity ranges were up to 151.0, 78.0, 79.5, 227.5, and 162.5 µM with a detection limit of 0.15, 0.12, 0.44, 4.02, 4.0, and 3.30 µM for UA, G, A, T, and C, respectively. Compared to a bare GCE, the nanocomposite-modified GCE demonstrated a large enhancement (~36.6%) of the electrochemical active surface area. Through chronoamperometric studies, the diffusion coefficients (D), standard catalytic rate constant (Ks), and heterogenous rate constant (Kh) were calculated for the analytes. Moreover, the nanocomposite-modified electrode was used for simultaneous detection in human serum, human saliva, and artificial saliva samples with recovery values ranging from 95% to 105%.

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Section: Chronoamperometrymentioning

confidence: 99%

Simultaneous Determination of Four DNA bases at Graphene Oxide/Multi-Walled Carbon Nanotube Nanocomposite-Modified Electrode

et al. 2020

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“…To examine the electroanalytical feature of the MWCNT@SY-CoPANI pH7 , AA oxidation and Fe(CN) 6 3– redox reactions were studied as model systems. It is well-known that most of the carbon-based electrodes including GCE, MWCNT, graphite oxide, graphene, graphite, and polyaniline have appreciable electrocatalytic activity to AA oxidation; however, they suffer from surface fouling and high overpotential problems. − Meanwhile, in some cases, to suppress the electrochemical behavior of AA, dilute Nafion solution, 0.5–1%, was generally coated on the working electrode, wherein the anionic form of AA (p K a 4.10) was electrostatically repelled by the Nafion-sulfphonic acid’s (−SO 3 – ) sites . Thus, by studying the CV behavior of MWCNT@SY-CoPANI pH7 with the above models (AA and Fe(CN) 6 3– ) and Nafion, one can get information about the surface features easily (Figure ).…”

Section: Resultsmentioning

confidence: 99%

An Unusual Electrochemical Reductive Cleavage of Azo Dye into Highly Redox Active Copolymeric Aniline Derivatives on a MWCNT Modified Electrode Surface at Neutral pH and Its Electroanalytical Features

2015

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Developments of new decomposition or degradation methods of environmentally hazardous azo dyes from textile industries are very important. Usually, strong acidbased chemical/electrochemical and neutral pH-based bacterial decomposition methods were widely used. Here, we report a mild, simple, and facile electrochemical method for decomposition of azo dye (Sudan yellow; SY) into a highly redox active copolymer of polyanilines via aniline derivatives as intermediates on a MWCNT modified glassy carbon electrode (GCE/MWCNT) surface unusually in a neutral pH using phosphate buffer solution (PBS) (GCE/MWCNT@SY-CoPANI pH7 ). One of the intermediate products, aniline (M w = 93 mol g −1 , calculated) was identified by an in situ cyclic voltammetry-electrochemical quartz crystal balance experiment. No such SY electrochemical reaction was observed on a naked GCE surface. Physico-chemical characterizations by TEM, Raman, IR, and UV−vis spectroscopic methods supported the formation of polymeric product on MWCNT surface (GCE/MWCNT@SY-CoPANI pH7 ). Electroanalytical performance of this new electrode was tested using ascorbic acid (AA) and Fe(CN) 6 3− , as models. Interestingly, a dilute solution of Nafion (Nf) casted modified electrode system (GCE/MWCNT@SY-CoPANI pH7 /Nf) showed improved electroanalytical performance, unlike the conventional Nafion modified system (GCE/MWCNT/Nf) with vanished peak current response due to the electrostatic repulsive interaction between the anionic AA (pK a = 4.10), Fe(CN) 6 3− ion, and anionic sulfonic acid groups in Nafion. A zwitter ionic complex between a polaronic copolyaniline and sulfonic acid of Nafion is proposed as a possible structure for the newly developed hybrid system. Using the GCE/MWCNT@SY-CoPANI pH7 /Nf, a selective flow injection analysis of AA has been demonstrated as an analytical application with good recovery values.

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“…Herein, a novel hybrid multi‐walled carbon nanotube‐ nanocomposite modified graphite paste electrode (GPE/MWCNT−Fe 3 O 4 NPs) was developed for simultaneous detection of INO and G as a model study, which can be extended on simultaneous detection of other nucleos(t)ides and related compounds. The MWCNT−Fe 3 O 4 NPs‐modified sensors possess an excellent performance in enhancing electrochemical reactivity, promoting electron‐transfer reactions, and reducing surface fouling [39–41]. The modification of Fe 3 O 4 NPs on MWCNTs yielded highly effective electro‐catalysts for chemically modified electrodes due to biocompatibility, low toxicity, easy preparation, and high adsorption capabilities [42–44].…”

Section: Introductionmentioning

confidence: 99%

The simultaneous voltammetric detection of guanine and inosine using a hybrid nanocomposite of multi‐walled carbon nanotubes and iron oxide nanoparticles

Soltani,

Noroozifar,

Kerman

2023

Electroanalysis

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Preparation of Tetraheptylammonium Iodide-Iodine Graphite-Multiwall Carbon Nanotube Paste Electrode: Electrocatalytic Determination of Ascorbic Acid in Pharmaceuticals and Foods

Cited by 13 publications

References 31 publications

Simultaneous Determination of Four DNA bases at Graphene Oxide/Multi-Walled Carbon Nanotube Nanocomposite-Modified Electrode

Simultaneous Determination of Four DNA bases at Graphene Oxide/Multi-Walled Carbon Nanotube Nanocomposite-Modified Electrode

An Unusual Electrochemical Reductive Cleavage of Azo Dye into Highly Redox Active Copolymeric Aniline Derivatives on a MWCNT Modified Electrode Surface at Neutral pH and Its Electroanalytical Features

The simultaneous voltammetric detection of guanine and inosine using a hybrid nanocomposite of multi‐walled carbon nanotubes and iron oxide nanoparticles

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