Electrochemical Behavior and Sensitive Methods of the Voltammetric Determination of Food Azo Dyes Amaranth and Allura Red AC on Amalgam Electrodes

Tvorynska, Sofiia; Josypčuk, Bohdan; Barek, Jiřı́; Dubenska, Liliya

doi:10.1007/s12161-018-1372-1

Cited by 33 publications

(10 citation statements)

References 55 publications

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“…Comparing the analytical characteristics of Ch detection using two investigated arrangements, the wider linear range and lower LOD were obviously obtained with wall‐jet arrangement with working MF‐AgSAE. The similar result was also observed in the previously published papers based on the comparison of working p‐AgSAE and AgSAE covered by mercury meniscus for voltammetric determination. As expected, with higher values of flow rate ( v flow =0.3 mL min −1 ) and injection volume ( V inj =120 μL) a higher sensitivity was reached.…”

Section: Resultssupporting

confidence: 90%

Amperometric Biosensor Based on Enzymatic Reactor for Choline Determination in Flow Systems

2019

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A simple, selective and stable biosensor with the enzymatic reactor based on choline oxidase (ChOx) was developed and applied for the determination of choline (Ch) in flow injection analysis with amperometric detection. The enzyme ChOx was covalently immobilized with glutaraldehyde to mesoporous silica powder (SBA‐15) previously covered by NH2‐groups. This powder was found as an optimal filling of the reactor. The detection of Ch is based on amperometric monitoring of consumed oxygen during the enzymatic reaction, which is directly proportional to Ch concentration. Two arrangements of an electrolytic cell in FIA, namely wall‐jet cell with working silver solid amalgam electrode covered by mercury film and flow‐through cell with tubular detector of polished silver solid amalgam were compared. The experimental parameters affecting the sensitivity and stability of the biosensor (i. e. pH of the carrier solution, volume of reactor, amount of the immobilized enzyme, the detection potential, flow rate, etc.) were optimized. Under the optimized conditions, the limit of detection was found to be 9.0×10−6 mol L−1. The Michaelis‐Menten constant for covalently immobilized ChOx on SBA‐15 was calculated. The proposed amperometric biosensor with the developed ChOx‐based reactor exhibits good repeatability, reproducibility, long‐term stability, and reusability. Its efficiency has been confirmed by the successful application for the determination of Ch in two commercial pharmaceuticals.

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Section: Resultssupporting

confidence: 90%

Amperometric Biosensor Based on Enzymatic Reactor for Choline Determination in Flow Systems

2019

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“…Among these, the electrochemical biosensors are the most promising given their inherent advantages of being simple, sensitive, rapid, portable, and cost-effective [11,13,14,16].…”

Section: Introductionmentioning

confidence: 99%

“…Sensors 2020, 20, x FOR PEER REVIEW 2 of 13 promising given their inherent advantages of being simple, sensitive, rapid, portable, and costeffective [11,13,14,16]. Indole-3-acetic acid (IAA) is the first identified auxin, which is regarded as the most important phytohormone [17].…”

Section: Introductionmentioning

confidence: 99%

Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

Cao

Zhu

et al. 2019

Sensors

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A selective and sensitive electrochemical sensor was developed for simultaneous detection of phytohormones indole-3-acetic acid (IAA) and salicylic acid (SA). The sensing interface was fabricated on a porous, three-dimensional networked graphene hydrogel (GH) modified glassy carbon electrode (GCE). The electrocatalytic behavior of IAA and SA on the surface of the modified electrode (GH/GCE) was investigated by cyclic voltammetry and linear sweep voltammetry. Results show that the oxidation reactions of IAA and SA occur at different potentials, which enable their simultaneous detection at the sensing interface. Under optimal conditions, the GH/GCE exhibited good selectivity and stability and its response, unaffected by various interferents, was linear in the range of 4 to 200 µM of IAA and SA. The limit of detection (S/N = 3) achieved were 1.42 µM for IAA and 2.80 µM for SA. The sensor performance was validated by measuring for IAA and SA in real vegetable samples with satisfactory results.

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“…[1][2][3][4] Therefore, U.S.A. has forbidden the use of amaranth in food, and China does not allow amounts of this additive in so drinks over the maximum limit of 0.05 g kg À1 (GB2760-2014). [5][6][7] Amaranth has recently been determined by numerous methods, namely spectrophotometry, 8,9 high performance liquid chromatography (HPLC), 10,11 thin layer chromatography (TCL), 12 electrochemical analysis, [13][14][15][16][17][18] uorescence, 19,20 colorimetry, 21 and electrophoresis. 22 Electrochemical method is superior to the aforementioned methods due to the excellent merits, e.g., easy operation, low cost, simple equipment requirement, and quick response.…”

Section: Introductionmentioning

confidence: 99%

A simple and sensitive approach for the electrochemical determination of amaranth by a Pd/GO nanomaterial-modified screen-printed electrode

et al. 2021

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Electrochemical Behavior and Sensitive Methods of the Voltammetric Determination of Food Azo Dyes Amaranth and Allura Red AC on Amalgam Electrodes

Cited by 33 publications

References 55 publications

Amperometric Biosensor Based on Enzymatic Reactor for Choline Determination in Flow Systems

Amperometric Biosensor Based on Enzymatic Reactor for Choline Determination in Flow Systems

Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

A simple and sensitive approach for the electrochemical determination of amaranth by a Pd/GO nanomaterial-modified screen-printed electrode

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