Liquid chromatography-electrochemical detection for the determination of ethoxyquin and its dimer in pear skin and salmon samples

Rodríguez-Gómez, R.; Vandeput, Marie; Zafra-Gómez, Alberto; Kauffmann, Jean‐Michel

doi:10.1016/j.talanta.2017.08.078

Cited by 15 publications

(15 citation statements)

References 24 publications

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“…The samples were analyzed in triplicate and EQ was not detected or it was below the LOQ. Those results were confirmed by LC‐EC . The developed FIA does not compete with other chromatographic methods in terms of LOD and LOQ but it can be considered as a high throughput method for quantification of EQ in real samples such as salmon meal and animal feed.…”

Section: Resultsmentioning

confidence: 58%

“…An oxidation peak was observed at +0.47 V. By multiple cyclings of an EQDM solution, a couple of reversible redox peaks near +0.1 V was detected (Figure C). The CV experiment indicated that EQ and EQDM were readily oxidized and this was recently exploited for EQ and EQDM determination by HPLC‐EC .…”

Section: Resultsmentioning

confidence: 99%

“…Due to the absence of certified reference materials for recovery studies, blank salmon samples were spiked with EQ. The blank samples were previously analyzed by LC‐EC in order to ensure the absence of EQ (< at the LOD of the method i. e. 0.05 mg/kg) . An aliquot of 1 g of salmon was weighted and spiked by adding a volume of standard solution of EQ.…”

Section: Methodsmentioning

confidence: 99%

“…EC methods can also be exploited for the quantitative determination of electroactive compounds in real samples. Several instrumental methods have been reported for the assay of EQ including gas chromatography with MS/MS and liquid chromatography with UV , EC , chemiluminescent nitrogen or fluorimetric detection. Ultra‐high pressure LC coupled to a quadrupole‐time‐of‐flight mass spectrometry (ULPC‐QTOF‐MS) was applied on salmon feed to detect EQ as well as on pears and apples to identify some EQ metabolites that are different from those reported in animal tissues .…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Studies of Ethoxyquin and its Determination in Salmon Samples by Flow Injection Analysis with an Amperometric Dual Detector

et al. 2017

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Ethoxyquin (EQ) is an antioxidant widely used in the food industry. Some concerns for human health have been reported since its utilization in animal feed may lead to residues in human food such as salmon samples. This work aimed to investigate the electrochemical behavior of EQ and its major oxidation products namely a dimer of EQ (EQDM) and ethoxyquin quinone imine (EQI) by cyclic voltammetry (CV) at a carbon screen printed electrode (cSPE). The stability of these products and their reactivity against glutathione (GSH) were also studied. Oxidized products and thiol adducts were identified by a microelectrolysis of an EQ solution onto a cSPE in the absence and in the presence of GSH. The products were analyzed off‐line, by liquid chromatography coupled to a mass spectrometer (LC‐MS). One of the generated product (EQI) was shown to be highly reactive towards GSH. Based on the redox pattern of EQ, a flow injection analysis with a dual cSPE was developed in order to detect in a rapid manner EQ in salmon samples. Since matrix effects were observed, matrix‐matched calibration curves with spiked samples were built. A linear response was obtained between 20–100 μM and a limit of detection (LOD) of 7.5 μM (8.2 mg/kg of salmon). Trueness was assessed with recovery assays at three levels of concentration. The recovery was close to 100 %. Precision was determined as RSD (%) with values lower than 6 % in all cases.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Studies of Ethoxyquin and its Determination in Salmon Samples by Flow Injection Analysis with an Amperometric Dual Detector

et al. 2017

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“…To date, various liquids have been identified by different methods such as liquid chromatography [ [24] , [25] ] and microfluidics [ [26] , [27] , [28] , [29] ]. First, the molecules are separated and then detected by various methods such as ultraviolet, photoluminescence, fluorescence, electrochemical, refractive index and electrical conductivity.…”

Section: Ptsi/porous Si Schottky Junctionmentioning

confidence: 99%

Ultrasensitive bio-detection using single-electron effect

Ashoori

Naderpour

Ghezelayagh

et al. 2021

Talanta

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Nanosized particles can detect minute changes in surrounding electric fields via a phenomenon known as single-electron effect. Sensitivity can reach as much as counting single electrons. This phenomenon promises the possibilty of detection of atoms, molecules, cells or pathogens passing over or suspended around the nanosized particles whose IV characteristics is being monitored. Unfortunately, practical realization of such devices has been challenging because of their small size and low operating temperature, well below freezing temperature of regular liquids. Here we introduce PtSi/porous Si Schottky junction as a room temperature large size single-electron device capable of detecting very minute changes in the electric fields and hence identifying molecules, cells, and bacteria suspended or dissolved in liquid solutions. Encouraging results for detection of healthy and cancerous human cells as well as liquids and microorganisms are provided.

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Analytical methods to analyze pesticides and herbicides

Wang

Shen

Gong

et al. 2019

Water Environment Research

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Presented in this paper is an annual review of literatures published in 2018 on topics relating to analytical methods for pesticides and herbicides. According to the different techniques, this review is divided into six sections, including extraction methods; chromatographic or mass spectrometric techniques; electrochemical techniques; spectrophotometric techniques; chemiluminescence and fluorescence methods; and biochemical assays.Practitioner points Totally 134 relevant research articles are summarized. The review is divided into six parts according to the techniques. Chromatographic and mass spectrometric methods are the most widely used.

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Liquid chromatography-electrochemical detection for the determination of ethoxyquin and its dimer in pear skin and salmon samples

Cited by 15 publications

References 24 publications

Electrochemical Studies of Ethoxyquin and its Determination in Salmon Samples by Flow Injection Analysis with an Amperometric Dual Detector

Electrochemical Studies of Ethoxyquin and its Determination in Salmon Samples by Flow Injection Analysis with an Amperometric Dual Detector

Ultrasensitive bio-detection using single-electron effect

Analytical methods to analyze pesticides and herbicides

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