Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes

Torres, Arturo; Bârsan, Mădălina M.; Brett, Christopher M.A.

doi:10.1016/j.foodchem.2013.10.114

Cited by 85 publications

(19 citation statements)

References 26 publications

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“…The oxidation process of CAF on all electrodes is irreversible, which is consistent with other reports [29]. The oxidation mechanism of CAF has been revealed by Hansen et al [30].…”

Section: Electrochemical Proceduressupporting

confidence: 91%

Fullerene/MWCNT/Nafion Modified Glassy Carbon Electrode for the Electrochemical Determination of Caffeine

Tajeu¹,

Dongmo²,

Tonlé³

2020

AJAC

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Herein, a convenient method based on a fullerene/multiwalled carbon nanotube/Nafion modified glassy carbon electrode (fullerene/MWCNT/Naf/GCE) for the electrochemical determination of caffeine (CAF) is reported. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to study ionic exchange properties and conductivity the proposed electrode using [Fe(CN) 6 ] 3−/4− redox couple. Caffeine gave an irreversible oxidation peak around +1.33 V (vs. Ag/AgCl reference electrode) in HClO 4 (pH 1). The linear dependence of the peak current with the square root of the scan rate showed that the electron transfer process is controlled by diffusion. After optimization of key analytical parameters involved in differential pulse voltammetry (DPV), the oxidation peak current varied linearly with CAF concentration in the range of 10 to 1000 µM. A detection limit of 7.289 × 10 −8 M (S/N = 3) was found. Kinetic and chronocoulometric studies were also performed to characterize the diffusion of CAF. The developed electrode exhibited good stability and was easily regenerated. The influence of some potential interfering compounds such as dopamine, uric acid, glucose and sulfite ions on the anodic peak current of CAF was also examined. The proposed method was successfully employed in the determination of CAF in some commercial drugs.

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“…The oxidation process of CAF on all electrodes is irreversible, which is consistent with other reports [29]. The oxidation mechanism of CAF has been revealed by Hansen et al [30].…”

Section: Electrochemical Proceduressupporting

confidence: 91%

Fullerene/MWCNT/Nafion Modified Glassy Carbon Electrode for the Electrochemical Determination of Caffeine

Tajeu¹,

Dongmo²,

Tonlé³

2020

AJAC

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“…Thus, the electroanalytical methods appear as an alternative to the traditional analytical methods. Carbon-based electrodes have been used widely for the electrochemical detection of different types of analytes [5][6][7], including caffeine [8][9][10]. In recent years, porous carbons have gained attention as potential electrochemical detectors [11,12] mainly due to its large surface area, tunable pore size, and efficient preparation.…”

Section: Introductionmentioning

confidence: 99%

Applicability of activated carbon obtained from peach stone as an electrochemical sensor for detecting caffeine

Arroyo-Gómez

Villarroel-Rocha

Araújo

et al. 2018

Journal of Electroanalytical Chemistry

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Simple, economical and highly sensitive electrodes for the detection of caffeine by using activated carbon from peach stones have been developed. The activated carbons were synthesized by chemical activation using ZnCl 2 and ZnCl 2 :FeCl 3 (1:1) as chemical agents, producing carbons with different textural properties and morphologies, which led to differences in the electroactive area of the materials that affected the electrochemical response to caffeine. The electrodes presented a linear response in the concentration range from 3.98 × 10 −5 to 4.58 × 10 −4 and 6.37 × 10 −4 M for the carbon activated with ZnCl 2 and ZnCl 2 :FeCl 3 (1:1), respectively. The detection limits were estimated in 2.85 × 10 −5 and 1.60 × 10 −5 M. The electrodes were tested to measure caffeine in real life samples, giving caffeine concentrations close to the reported values. Despite presenting the lowest surface area and the lowest thermal stability, the activated carbon obtained with ZnCl 2 :FeCl 3 (1:1) was more sensitive to caffeine, measuring caffeine concentrations very close to the reported values for the tested beverages. These results show that these electrodes may be an alternative to develop new and reliable analytical tools at low cost with high efficiency.

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“…High performance liquid chromatography [16, 17], capillary chromatography [18, 19], spectroscopy [20, 21], and electrochemical [22, 23] methods are among the reported methods for determination of caffeine in coffee, tea, and cola beverage samples. Most of the reported methods require carcinogenic organic solvents for extraction and hence are environmentally nonfriendly.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the reported methods require carcinogenic organic solvents for extraction and hence are environmentally nonfriendly. Moreover, using time-consuming sample preparation procedures such as liquid-liquid extraction and solid-phase extraction or the use of more than one chromatographic step, costly instrumentation, and high skilled technician [12, 23] makes them inconvenient.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to the conventional analytical methods, electrochemical methods are powerful and versatile analytical techniques that offer high sensitivity, accuracy and precision, relatively wider linear dynamic range and low-cost instrumentation, specificity for a particular oxidation state of an element, relative inexpensiveness, and being usually environmentally friendly (use no or minimum amount of organic solvent) [23, 24]. …”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode

Amare

Aklog

2017

Journal of Analytical Methods in Chemistry

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Lignin film was deposited at the surface of glassy carbon electrode potentiostatically. In contrast to the unmodified glassy carbon electrode, an oxidative peak with an improved current and overpotential for caffeine at modified electrode showed catalytic activity of the modifier towards oxidation of caffeine. Linear dependence of peak current on caffeine concentration in the range 6 × 10−6 to 100 × 10−6 mol L−1 with determination coefficient and method detection limit (LoD = 3 s/slope) of 0.99925 and 8.37 × 10−7 mol L−1, respectively, supplemented by recovery results of 93.79–102.17% validated the developed method. An attempt was made to determine the caffeine content of aqueous coffee extracts of Ethiopian coffees grown in four coffee cultivating localities (Wonbera, Wolega, Finoteselam, and Zegie) and hence to evaluate the correlation between users preference and caffeine content. In agreement with reported works, caffeine contents (w/w%) of 0.164 in Wonbera coffee; 0.134 in Wolega coffee; 0.097 in Finoteselam coffee; and 0.089 in Zegie coffee were detected confirming the applicability of the developed method for determination of caffeine in a complex matrix environment. The result indicated that users' highest preference for Wonbera and least preference for Zegie cultivated coffees are in agreement with the caffeine content.

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Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes

Cited by 85 publications

References 26 publications

Fullerene/MWCNT/Nafion Modified Glassy Carbon Electrode for the Electrochemical Determination of Caffeine

Fullerene/MWCNT/Nafion Modified Glassy Carbon Electrode for the Electrochemical Determination of Caffeine

Applicability of activated carbon obtained from peach stone as an electrochemical sensor for detecting caffeine

Electrochemical Determination of Caffeine Content in Ethiopian Coffee Samples Using Lignin Modified Glassy Carbon Electrode

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