Electroanalytical Method for Determining Pyrogallol in Biodiesel in the Presence of a Surfactant

Araújo, Alessandra Silveira Antunes; Caramit, Ricardo Pini; Oliveira, Lincoln Carlos Silva de; Ferreira, Valdir Souza

doi:10.1002/elan.201400647

Cited by 13 publications

(12 citation statements)

References 64 publications

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“…When the surfactant reaches its critical micelle concentration (CMC, 0.65 mmol L −1 ), the surfactant molecules remain in aggregates of bound micelles by hydrophobic interactions . The presence of surfactant micelles leads to the formation of a surfactant bilayer on the surface of the electrode that is capable of interfering with the electron transfer, reducing the increase in current . Thus, a concentration of 0.6 mmol L −1 was chosen for future experiments.…”

Section: Resultsmentioning

confidence: 99%

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

et al. 2020

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In this work, a simple and low‐cost method was developed for the simultaneous determination of the antioxidants tert‐butylhydroquinone (TBHQ) and butylated hydroxyanisole (BHA) in the presence of the cationic surfactant CPB by square wave voltammetry (SWV) technique using a carbon black paste electrode (CBPE). The performance of the method was investigated by varying parameters such as pH, electrolyte, and type and concentration of surfactant. Under the optimum conditions of 0.2 mol L−1 phosphate buffer (pH 7.0), 600.0 μmol L−1 of cetylpyridinium bromide surfactant and SWV operating parameters optimized through the Doehlert matrix, the method presented low limits of quantification for TBHQ and BHA (0.23 and 0.26 μmol L−1, respectively) and high precision in successive measurements. The proposed method was applied in mayonnaise, margarine and biodiesel and the accuracy of method was checked by the HPLC technique.

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Section: Resultsmentioning

confidence: 99%

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

et al. 2020

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“…This enhancement on analytical signal can be attributed to the surfactant capacity to adsorb on a rough surface, such as carbon‐based electrodes, via hydrophobic interactions to generate a surfactant‐adsorbed layer 44. The higher peak currents observed should result from a better adsorption and electrostatic interactions between MBC and this surfactant‐adsorbed layer, which leads to an increase on MBC available at electrode surface trough the SDS adsorbed layer.…”

Section: Resultsmentioning

confidence: 99%

Sensitive Approach for Voltammetric Determination of Carbendazim Based on the Use of an Anionic Surfactant

et al. 2016

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This report describes by the first time the use of a commercial screen‐printed carbon electrode modified with multi‐walled carbon nanotubes for voltammetric determination of the fungicide carbendazim in the presence of an anionic surfactant. The oxidation of the pesticide showed two anodic and two catodic peaks over a quasi‐reversible system. The quantitative studies were performed using square‐wave voltammetry technique at anodic direction, in that an oxidation peak was observed at +0.98 V vs. Ag/AgCl. Buffer, pH and voltammetric parameters were investigated and optimized. The use of the anionic surfactant sodium dodecyl sulphate provided a significative improvement on analytical sensitivity and its influence also was evaluated. The best conditions for analysis were achieved using a medium of 0.04 mol L−1 Britton‐Robinson buffer at pH 4.00 containing 6.04×10−4 mol L−1 of surfactant. A calibration curve with good linearity (R=0.999) was obtained and the limit of detection achieved was 1.40×10−8 mol L−1 (2.7 ppb). Lastly, the developed method was successfully applied for determination of carbendazim in a spiked orange juice sample and a recovery of 101.7 % was obtained. The results were compared with HPLC technique with good agreement. Based on the data presented, the proposed method shows great promise to be applied in routine analysis of carbendazim in food samples and the approach based on the anionic surfactant effect can be an improvement for other applications.

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“…2,[4][5][6][7] Therefore, the monitoring of this antioxidant in biodiesel can bring information related to the oxidation stability of biodiesels. 8 Electrochemical methods have been reported to the determination of pyrogallol (PY), including enzyme electrodes system, 9 screen-printed graphite electrodes, 10,11 modified carbon paste electrodes, 12,13 and polyaminoanthraquinone film-modified platinum wire, 14 which were applied to different matrices. Only one of these works was devoted to the analysis of biodiesel.…”

Section: Introductionmentioning

confidence: 99%

“…Only one of these works was devoted to the analysis of biodiesel. 10 The main drawback of the analysis of biodiesel by electrochemical methods is related to the low dielectric constant of this matrix, adsorption effects on the electrode surface and incompatibility with screen-printed electrodes. [15][16][17] Because of this difficulty, sample dilution in hydroethanolic electrolyte is often necessary to the analysis of biodiesel.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17] Because of this difficulty, sample dilution in hydroethanolic electrolyte is often necessary to the analysis of biodiesel. 10,16,17 Electrodes modified with carbon nanotubes (CNTs) are widely used because they have important characteristics such as high electron transfer due to its electrocatalytic capacity, high resistance to surface fouling, greater active area, resulting in improved electrochemical sensors with higher sensitivity. [18][19][20] CNTs are designated into two classes: single-walled carbon nanotubes (SWCNT), with a single rolled graphene sheet; and multi-walled carbon nanotubes (MWCNT) with a set of rolled graphene sheets spaced between their layers.…”

Section: Introductionmentioning

confidence: 99%

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Batch-Injection Amperometric Determination of Pyrogallol in Biodiesel Using a Multi-Walled Carbon Nanotube Modified Electrode

Cardoso¹,

Dornellas²,

Lima³

et al. 2016

J. Braz. Chem. Soc.

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This work demonstrates the application of batch-injection analysis (BIA) with amperometric detection on a multi-walled carbon nanotube (MWCNT) modified electrode for the sensitive determination of the antioxidant pyrogallol in biodiesel. Samples were diluted in electrolyte (0.1 mol L-1 HClO 4) before injection using an electronic micropipette on the BIA cell. The size effect of MWCNTs on electrochemical oxidation of pyrogallol was investigated and 3.5-fold increase in the amperometric sensitivity using the modified electrode with MWCNTs of shorter dimensions was obtained. This result was in agreement with cyclic voltammetry and electrochemical impedance spectroscopy measurements. After optimization of BIA parameters for the amperometric detection on the MWCNT-modified electrode, the proposed method presented a linear range from 0.3 to 1000 µmol L-1 , detection limit of 0.013 µmol L-1 , precision of 3%, and sample throughput of 240 h-1. Spiked biodiesel samples were analyzed and recovery values between 95-99% were obtained.

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Electroanalytical Method for Determining Pyrogallol in Biodiesel in the Presence of a Surfactant

Cited by 13 publications

References 64 publications

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

Feasibility of a Nano‐Carbon Black Paste Electrode for Simultaneous Voltammetric Determination of Antioxidants in Food Samples and Biodiesel in the Presence of Surfactant

Sensitive Approach for Voltammetric Determination of Carbendazim Based on the Use of an Anionic Surfactant

Batch-Injection Amperometric Determination of Pyrogallol in Biodiesel Using a Multi-Walled Carbon Nanotube Modified Electrode

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