Characterization of the ultraviolet–visible photoproducts of thiophanate-methyl using high performance liquid chromatography coupled with high resolution tandem mass spectrometry—Detection in grapes and tomatoes

Chayata, Houda; Lassalle, Yannick; Nicol, Édith; Manolikakes, Sophia; Souissi, Yasmine; Bourcier, Sophie; Gosmini, Corinne; Bouchonnet, Stéphane

doi:10.1016/j.chroma.2016.02.078

Cited by 14 publications

(9 citation statements)

References 31 publications

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“…Ultrahigh-resolution mass spectrometric analysis was performed using a 9.4 Tesla "solariX XR" Fourier-transform ion cyclotron mass spectrometer (Bruker Daltonics, Bremen, Germany) fitted with electrospray ionization operated in positive ionization mode. The instrumental conditions were adapted from Chayata et al [29]. Infusion with 100 accumulated scans was preferred to liquid chromatography injection with no accumulated scan, in order to increase signal-to-noise ratio.…”

Section: Analytical Devicesmentioning

confidence: 99%

Is It Possible to Measure Monobromamine Using Colorimetric Methods Based on the Berthelot Reaction, Like for Monochloramine?

2020

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Analytical methods based on the Berthelot reaction were recently adapted for determining monochloramine (MCA: NH2Cl) in freshwater. The specificity of the Berthelot reaction with regard to MCA is related to the need for two exchangeable hydrogen atoms to form indophenol blue. MCA can thus be distinguished from organic N-chloramines, which have only one exchangeable hydrogen atom. Monobromamine (MBA: NH2Br) may be formed during chlorination of seawater containing ammonium ions. Quantifying MBA is quite challenging and no method has been reported for its specific determination in seawater. As MBA also has two exchangeable hydrogen atoms, its reactivity might be analogous to that of MCA, but this hypothesis has never been investigated. The aim of this study was to examine the applicability of the so-called “indophenol method” for the determination of the MBA in freshwater and seawater samples. The reaction between MBA and Berthelot reagents was studied in both ultrapure water and artificial seawater. The reaction products were characterized by using gas chromatography coupled to mass spectrometry (GC–MS), Fourier transform-ion cyclotron resonance mass spectrometry (FT–ICR MS), and UV–vis spectroscopy. Results showed that colorimetric methods based on the Berthelot reaction were not suitable for measuring MBA in freshwater or seawater, since NH2Br reacts with alkaline phenol derivative via electrophilic substitution to form ortho- and para-brominated phenols instead of forming indophenol.

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Section: Analytical Devicesmentioning

confidence: 99%

Is It Possible to Measure Monobromamine Using Colorimetric Methods Based on the Berthelot Reaction, Like for Monochloramine?

2020

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“…Thiophanate methyl whose chemical structure is shown in Figure 1 is known as a member of the benzimidazole group of fungicides [16]. It is a broad-spectrum systemic fungicide that has been employed to control the pathogens recently.…”

Section: Introductionmentioning

confidence: 99%

“…It is a broad-spectrum systemic fungicide that has been employed to control the pathogens recently. However according to the office of Environmental Health Hazard Assessment (OEHHA), long exposure to residue from thiophanate methyl in agricultural products may cause serious effects on human health [16]. Therefore, it is essential to develop a sensitive on-site method to detect residual thiophanate methyl in agricultural products to prevent humans from being exposed to thiophanate methyl [17].…”

Section: Introductionmentioning

confidence: 99%

Potential Application of Gold Nanospheres as a Surface Plasmon Resonance Based Sensor for In-Situ Detection of Residual Fungicides

Nhat

Phong

Nguyen

et al. 2020

Sensors

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It is essential to develop a simple and sensitive method to rapidly detect residual fungicides in agricultural products to protect human health. So far, little studies have been reported on potential application of gold nanospheres (AuNSps) as a surface plasmon resonance based sensor for in-situ detection of residual fungicides. Therefore, in this study, we investigated the potential application of AuNSps as a surface plasmon resonance based sensor for in-situ detection of fungicides. AuNSps were successfully synthesized via a seed-mediated method with some modifications. Firstly, gold nanoseeds were made during the reduction of chloroauric acid by trisodium citrate dihydrate (TSC). Then, AuNSps were grown from the seeds by using HAuCl 4 , TSC and EDTA. AuNSps were subsequently dropped on a glass substrate before covered by thiophanate methyl, a broad-spectrum systemic fungicide. The AuNSps coated glass substrate was subsequently dried in the air for further surface-enhanced Raman spectroscopy (SERS) measurements. Optical properties, shape and size of AuNSps were confirmed by UV-vis spectroscopy, XRD, SEM-EDX and TEM. The results showed that AuNSps were successfully synthesized with the size of 53 nm, and their resonance peak was located at 560 nm. The Raman signal intensity of thiophanate methyl covered on AuNSps is higher than that without AuNSps, indicating SERS effects of AuNSps deposited glass substrate.

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“…Nowadays, the use of pesticides is inevitable to protect the agricultural products against fungi, insects, and other organisms . However, in spite of their potential benefits, they are a large class of environmental pollutants .…”

Section: Introductionmentioning

confidence: 99%

“…Besides, due to the wide usage of pesticides, they can be released into the environmental water sources/soils and enter fruits and vegetables [5][6][7]. Moreover, the presence of pesticides in grape and tomato has been reported in the concentration range of 0.1-3.9 mg/kg [1]. According to European Union regulation of pesticides residues in grape, apple, and tomato are in analytes [19,20].…”

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confidence: 99%

Electroless‐coated magnetic three‐dimensional graphene with silver nanoparticles used for the determination of pesticides in fruit samples

Sereshti

Afsharsaveh

Gaikani

et al. 2018

J of Separation Science

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A new type of adsorbent composed of magnetic three-dimensional graphene coated with silver nanoparticles was synthesized by an electroless technique and used in the magnetic solid-phase extraction of selected pesticides (fenitrothion, chlorpyrifos, and hexaconazole) before gas chromatography with a micro-electron capture detector. The adsorbent was characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometry, and field-emission scanning electron microscopy. The important extraction parameters such as pH, adsorbent dose, extraction time, and desorption conditions were investigated. Under the optimal conditions, the analytical figures of merit were obtained as: linear dynamic range of 0.1-5 ng/g with determination coefficients of 0.991-0.996; limit of detection of 0.07-0.13 ng/g; limit of quantification of 0.242-0.448 ng/g; and the intraday and interday relative standard deviations (C = 5 ng/g, n = 3) were 3.8-8.7 and 6.6-8.9%, respectively. The developed method was successfully applied for analysis of the selected pesticides in tomato and grape with extraction recoveries in the range of 72.8-109.6%.

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Characterization of the ultraviolet–visible photoproducts of thiophanate-methyl using high performance liquid chromatography coupled with high resolution tandem mass spectrometry—Detection in grapes and tomatoes

Cited by 14 publications

References 31 publications

Is It Possible to Measure Monobromamine Using Colorimetric Methods Based on the Berthelot Reaction, Like for Monochloramine?

Is It Possible to Measure Monobromamine Using Colorimetric Methods Based on the Berthelot Reaction, Like for Monochloramine?

Potential Application of Gold Nanospheres as a Surface Plasmon Resonance Based Sensor for In-Situ Detection of Residual Fungicides

Electroless‐coated magnetic three‐dimensional graphene with silver nanoparticles used for the determination of pesticides in fruit samples

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