Simultaneous determination of caffeine and paracetamol by square wave voltammetry at poly(4-amino-3-hydroxynaphthalene sulfonic acid)-modified glassy carbon electrode

Tefera, Molla; Geto, Alemnew; Tessema, Merid; Admassie, Shimelis

doi:10.1016/j.foodchem.2016.04.106

Cited by 95 publications

(35 citation statements)

References 21 publications

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“…As shown in Figure 4, the current response of PA with the presence of 5 fold interference species shows negligible changes. Based on our previous study [48], the selectivity of the GI/GCE can be further improved by surface functionalization of beta-cyclodextrin due to its high supramolecular recognition and enrichment capability. It was also found that 20 folds of K + , Na + , SO 4 2− , NO 3 2− , and Cl − did not interfere in the determination, suggesting the treatment-deduced electrocatalytic oxidation of PA could effectively avoid the interference.…”

Section: Resultsmentioning

confidence: 99%

Graphene Ink Film Based Electrochemical Detector for Paracetamol Analysis

Xie

Zheng

et al. 2018

Electronics

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Graphene ink is a commercialized product in the graphene industry with promising potential application in electronic device design. However, the limitation of the graphene ink is its low electronic performance due to the ink preparation protocol. In this work, we proposed a simple post-treatment of graphene ink coating via electrochemical oxidation. The electronic conductivity of the graphene ink coating was enhanced as expected after the treatment. The proposed electrochemical oxidation treatment also exposes the defects of graphene and triggered an electrocatalytic reaction during the sensing of paracetamol (PA). The overpotential of redox is much lower than conventional PA redox potential, which is favorable for avoiding the interference species. Under optimum conditions, the graphene ink-based electrochemical sensor could linearly detect PA from 10 to 500 micro molar (µM), with a limit of detection of 2.7 µM.

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Section: Resultsmentioning

confidence: 99%

Graphene Ink Film Based Electrochemical Detector for Paracetamol Analysis

Xie

Zheng

et al. 2018

Electronics

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“…Most recent relevant work is used here for the comparison. These data show that the detection limit was comparable with those of other electrochemical sensors . Regarding the linear range.…”

Section: Resultsmentioning

confidence: 99%

“…Regarding the linear range. it is wider compared with several relevant work , and inferior compared with some others . Most reported results are at modified carbon electrodes and few are at modified gold electrodes.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Electrocatalytic Oxidation of Paracetamol at DNA Modified Gold Electrode

2019

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Cysteine monolayer has been assembled onto bare gold electrode (SAM/Au), and subsequently deoxyribonucleic acid (DNA) has been successfully immobilized at the SAM/Au electrode. The thus modified electrode is assigned DNA/SAM/Au. Modification steps of the electrode were followed electrochemically using K4[Fe(CN6)] electrochemical marker. Also, the build‐up of the modified electrode composition is followed using EDX and the crystallographic orientation is inspected using XRD. The electrochemical behavior of paracetamol (PC) at DNA/SAM/Au electrode is investigated. Interestingly, the sluggish irreversible behavior of PC at the bare gold electrode is converted to a quasi‐reversible one at DNA/SAM/Au electrode pointing to some interaction between the immobilized DNA and PC. The enhanced electrochemical behavior of PC at modified DNA/SAM/Au electrode is successfully used for a sensitive electrochemical determination of PC. Square wave voltammetry (SWV) was used for this purpose. The concentration of PC was in linear relation with the peak current at the optimum conditions within the range 10.0–110.0 μg mL−1 with correlation coefficient (R2) of 0.998. Also, the standard deviation (SD) and relative standard deviation (RSD) were calculated and found to be 0.817 and 1.52, respectively, indicating the significance of the present method.

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“…This is because the electrochemical oxidation of phenolic compounds 5‐CQA and VAN can readily produce polymeric film on the electrode surface, which causes rather poor selectivity and sensitivity, or the oxidation of CAF occurs at a very positive potential that overlaps with the discharge of the background electrolytic solution that often gives low reproducible analysis. An effective way to overcome these barriers is to use chemically or biologically modified electrodes . However, it is important to mention at this point that no literature data were found in regard to the multicomponent analysis of 5‐CQA, VAN and CAF in their ternary mixtures covering any instrumental techniques except in our very recent report on the voltammetric methodology established by means of boron‐doped diamond (BDD) electrode .…”

Section: Introductionmentioning

confidence: 94%

A Graphene‐based Electrochemical Sensor for the Individual, Selective and Simultaneous Determination of Total Chlorogenic Acids, Vanillin and Caffeine in Food and Beverage Samples

et al. 2018

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An electrochemical sensor based on the electrocatalytic activity of graphene (GR) was prepared, and used for the individual, selective and simultaneous determination of 5‐O‐Caffeoylquinic acid (5‐CQA) that is major compound of chlorogenic acids in coffee, vanillin (VAN) and caffeine (CAF). The electrochemical behaviors of these compounds on GR modified glassy carbon electrode (GR/GCE) were investigated by cyclic voltammetry and square‐wave adsorptive stripping voltammetry. By using stripping conditions after 30 s accumulation under open‐circuit voltage, the electrochemical oxidation peaks appeared at +0.53, 0.83 and 1.39 V in phosphate buffer pH 2.5, and good linear current responses were obtained with detection limits of 4.4×10−9, 5.0×10−7, and 3.0×10−7 M for 5‐CQA, VAN and CAF, respectively. The potential applicability of the proposed method was illustrated in commercial food and beverage samples.

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Simultaneous determination of caffeine and paracetamol by square wave voltammetry at poly(4-amino-3-hydroxynaphthalene sulfonic acid)-modified glassy carbon electrode

Cited by 95 publications

References 21 publications

Graphene Ink Film Based Electrochemical Detector for Paracetamol Analysis

Graphene Ink Film Based Electrochemical Detector for Paracetamol Analysis

Enhanced Electrocatalytic Oxidation of Paracetamol at DNA Modified Gold Electrode

A Graphene‐based Electrochemical Sensor for the Individual, Selective and Simultaneous Determination of Total Chlorogenic Acids, Vanillin and Caffeine in Food and Beverage Samples

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