Interaction study of paraquat and silver electrode using electrochemical impedance spectroscopy: Application in milk and tomato samples

Farahi, A.; Gaini, L. El; Achak, M.; Yamani, S. El; Mhammedi, M.A. El; Bakasse, M.

doi:10.1016/j.foodcont.2014.08.005

Cited by 24 publications

(10 citation statements)

References 41 publications

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Section: Resultsmentioning

confidence: 99%

“…Because PQ is highly water soluble, the contamination of common food items with PQ is one of the major problems encountered during food processing.T he production of superoxide radicals during the metabolism of PQ is the primary source of its acutet oxicity. [42,43] Considering these disturbing facts, we furthera ppliedo ur new procedure for the detection of PQ in the commonly consumed dairyp roduct, milk (see the Supporting Information, Figure S10). Various diluted milk samples were spiked with PQ and the addition of the QDs to these solutions resultedi np rominent emission quenching, without any interferencef rom other dietaryc omponents (Figure 8a).…”

Section: Identification Of Paraquat In Adulterated Milk Samplementioning

confidence: 99%

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Utilization of Red‐Light‐Emitting CdTe Nanoparticles for the Trace‐Level Detection of Harmful Herbicides in Adulterated Food and Agricultural Crops

Dey

Bhagat

Cherukaraveedu

et al. 2016

Chemistry An Asian Journal

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Red-light-emitting water-soluble semiconducting quantum dots (QDs) were synthesized by using a wide variety of commercially available thiol-type capping agents. QDs with a negatively charged nanosurface showed excellent selectivity for paraquat (PQ) at pH 7.4 over other commonly encountered pesticides/herbicides, including diquat (DQ). The presence of a 4,4'-bis-pyridinium unit in PQ enabled it to initiate long-range aggregation, thereby leading to the formation of nanostructures with excellent emission-quenching behavior. Precoated quartz plates were developed as a low-cost, portable sensor for the on-site detection of PQ in both natural water and human urine. Estimation of the PQ concentration was performed in different commercial formulations and the detection of PQ contamination in adulterated dairy product was also achieved with excellent sensitivity. Finally, we screened more than 50 different food items, including vegetables, fruits, cereals, and fodders, to construct a generalized marker for any residual PQ in such specimens.

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Section: Resultsmentioning

confidence: 99%

Section: Identification Of Paraquat In Adulterated Milk Samplementioning

confidence: 99%

Utilization of Red‐Light‐Emitting CdTe Nanoparticles for the Trace‐Level Detection of Harmful Herbicides in Adulterated Food and Agricultural Crops

Dey

Bhagat

Cherukaraveedu

et al. 2016

Chemistry An Asian Journal

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“…This technique is an efficient tool to distinguish the complex electrochemical reactions, along with Faradic and non‐Faradic processes . These advantages make general application of EIS in various electrochemical systems .…”

Section: Introductionmentioning

confidence: 98%

Electrochemical Impedance Spectroscopic Investigation in Detecting 2,4‐dinitrophenylhydrazine Using Catalytic Effect of Copper at Glassy Electrode

et al. 2016

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This paper reports on the use of electrochemical impedance spectroscopy (EIS) allied to copper (II) for the determination of 2,4‐dinitrophenylhydrazine (DNPH) at glassy carbon electrode (GCE). The experiment measurements were carried out in methanol at a potential of 0.3 V versus Ag/AgCl. The Nyquist plots were modeled with a Randle equivalent circuit, by identifying the charge transfer resistance as the relevant concentration dependent parameter. These measurements show that the impedance spectra of DNPH increased by the formation of non‐electroactive compound produced from specific interaction between DNPH and Cu (II), which will block the electron‐transfer process of the redox probe. Therefore, the proposed methodology offers a detection limit of 4.0×10−8 mol L−1. The proposed methodology was satisfactorily applied to determine DNPH in industrial water samples.

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“…Electrochemical impedance spectroscopy method (EIS) has been known as one of the most common techniques because it is simple, direct, rapid and has been broadly utilized to quantify organic compounds [ 13 , 14 , 15 ]. Indeed, this sensitive technique is used to monitor the electrical current response of the studied system by applying a periodic small amplitude signal.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical impedance spectroscopy measurements for determination of derivatized aldehydes in several matrices

Boumya

Laghrib

Lahrich

et al. 2017

Heliyon

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A simple, selective and sensitive electrochemical method is described for the determination of different aldehydes at glassy carbon electrode using electrochemical impedance spectroscopy (EIS). The measurements were performed after their derivatization with 2,4-dinitrophenylhydrazine (DNPH) in acidic medium. The impedance measurements were investigated in the frequency range from 100 mHz to 100 kHz at a potential of 1.0 V versus Ag/AgCl. The Nyquist plots were modeled with a Randle’s equivalent circuit. The charge transfer resistance was identified as the dependent parameter on relevant concentration of aldehydes (determined as their hydrazones). Under the optimized conditions, the linearity was established over the concentration range of 1000–0.05 μmol L−1. The limits of detection (LODs) obtained were from 0.097 to 0.0109 μmol L−1. Finally, the developed method has been applied to the determination of aldehydes in drinking water, orange juice and apple vinegar samples with relative standard deviations (RSDs) < 3.1% and acceptable recovery rate (around of 80%).

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Interaction study of paraquat and silver electrode using electrochemical impedance spectroscopy: Application in milk and tomato samples

Cited by 24 publications

References 41 publications

Utilization of Red‐Light‐Emitting CdTe Nanoparticles for the Trace‐Level Detection of Harmful Herbicides in Adulterated Food and Agricultural Crops

Utilization of Red‐Light‐Emitting CdTe Nanoparticles for the Trace‐Level Detection of Harmful Herbicides in Adulterated Food and Agricultural Crops

Electrochemical Impedance Spectroscopic Investigation in Detecting 2,4‐dinitrophenylhydrazine Using Catalytic Effect of Copper at Glassy Electrode

Electrochemical impedance spectroscopy measurements for determination of derivatized aldehydes in several matrices

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