Analysis of organophosphorus and pyrethroid pesticides in organic and conventional vegetables using QuEChERS combined with dispersive liquid-liquid microextraction based on the solidification of floating organic droplet

Mao, Xuejin; Wan, Yiqun; Li, Zhanming; Chen, Lin; Lew, H.; Yang, Hongshun

doi:10.1016/j.foodchem.2019.125755

Cited by 77 publications

(37 citation statements)

References 39 publications

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“…Appropriate coefficients of determination (R 2 ) were obtained for the scope of the targeted pesticides, with R 2 in the range of 0.9900-0.9994. The LOQ values were similar to or better than those of previously published works [19][20][21]. The LOQ ranged from 0.77 to 1.79 µg/kg for OCP and 0.57-1.57 µg/kg for OPP.…”

Section: Methods Evaluationsupporting

confidence: 83%

“…Regarding OPP, no detection was observed in the studied samples. However, in recent studies, the presence of OPP (e.g., chlorpyrifos) has been reported in organic lettuce [21] and conventional strawberries [46]. The results obtained in the present study showed that there are concerns with OPP in regards to chemical safety.…”

Section: Sample Analysiscontrasting

confidence: 45%

“…The 2019 European Food Safety Authority (EFSA) report on pesticide residues in food [ 18 ] concluded that there is a lack of work in the scientific literature on organic products. There are only a few recent studies that describe chemical safety in terms of pesticides in organic lettuce samples [ 19 , 20 , 21 ]. Similarly, and in accordance with the European food legislation (Regulation (EC) No.…”

Section: Introductionmentioning

confidence: 99%

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Microbiological and Chemical Quality of Portuguese Lettuce—Results of a Case Study

Ferreira

Lopes

Costa

et al. 2020

Foods

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In addition to environmental pollution issues, social concerns about the sustainability, safety, and quality of conventionally grown fruits and vegetables have been increasing. In order to evaluate if there were any microbiological differences between samples of organic and conventional lettuce, a wide range of parameters were tested, including pathogens and indicator organisms: the enumeration of Escherichia coli; the detection of Salmonella spp.; the detection/enumeration of Listeria monocytogenes; the enumeration of lactic acid bacteria, Pseudomonas spp. yeasts and molds, and Enterobacteriaceae. This study also evaluated the chemical safety of the lettuce samples, quantifying the nitrate concentration and 20 pesticides (14 organochlorine and 6 organophosphorus pesticides). Significant differences (p < 0.05) between the conventional and organic samples were only detected for the counts of total microorganisms at 30 °C. Pathogens were absent in all the samples. The analytical method, using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) approach for pesticide extraction, was suitable for detecting the targeted analytes; the limit of quantification (LOQ) was between 0.6 and 1.8 µg/kg (lower than the Maximum Residue Levels (MRLs) established by EU legislation). In three organic lettuce samples, one organochlorine pesticide (α-HCH) was observed below the MRLs. For the samples analyzed and for the parameters investigated, except for the total mesophilic counts, the organic and conventional lettuces were not different.

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Section: Methods Evaluationsupporting

confidence: 83%

Section: Sample Analysiscontrasting

confidence: 45%

Section: Introductionmentioning

confidence: 99%

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Microbiological and Chemical Quality of Portuguese Lettuce—Results of a Case Study

Ferreira

Lopes

Costa

et al. 2020

Foods

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“…The conventional methods for pyrethroid analysis are gas chromatography-electron capture detector (GC-ECD) [ 37 , 38 , 39 , 40 ], gas chromatography–mass spectrometry (GC-MS) [ 41 , 42 , 43 , 44 ], liquid chromatography-UV (LC-UV) [ 45 , 46 ], and liquid chromatography–mass spectrometry (LC-MS) [ 47 , 48 , 49 , 50 , 51 ]. The instrumental techniques mentioned above offer high accuracy and precision, good sensitivity, and a very low detection limit, although they are expensive, complicated, and laborious.…”

Section: Introductionmentioning

confidence: 99%

A Microfluidic Paper-Based Analytical Device for Type-II Pyrethroid Targets in an Environmental Water Sample

Pengpumkiat

Nammoonnoy²,

Wongsakoonkan

et al. 2020

Sensors

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A detection method for type-II pyrethroids in an environmental water sample using a microfluidic paper-based analytical device (µPAD) is reported here. The detection approach is based on the formation of cyanide from the hydrolysis of type-II pyrethroids and the colorimetric detection of cyanide on a layer-based µPAD. Parafilm and inexpensive laminating pouches were used to create a hydrophobic barrier for the assay on the µPAD. This detection approach was selective to type-II pyrethroids in water for which an environmental water sample was tested. The calibration curves for cypermethrin, deltamethrin, cyhalothrin, and fenvalerate ranged from 2 to 40 µg/mL without sample preconcentration. The lower concentrations of type-II pyrethroids can be assessed by including a preconcentration step prior to the detection on a µPAD. This detection system provides an alternative platform for fast, semiquantitative testing for pesticide contamination in environmental surface water by allowing for portability, low reagent/sample consumption, and low-cost testing.

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“…Consequently, OPP has been found to be the major contaminant in water, environment and eco-chain [5,6]. In the pollution situation of traditional Chinese medicinal materials, OPP is the main object of pesticide pollution [7][8][9][10]. Inevitably, the highly prevalent use of pesticides has made the quality and safety of the herbal products a highly worrisome problem.…”

Section: Introductionmentioning

confidence: 99%

A new fluorescent technique for pesticide detection by using metal coordination polymer and nanozyme

Wei

Xue

Dong³

et al. 2020

Chin Med

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Background: Chinese herbs have been widely used for thousands of years. In order to kill or control insects and fungus during the cultivation of herb plants, pesticides have played a significant role. More than 30 kinds of pesticides have been documented in the latest version of Chinese Pharmacopoeia. It is urgent to develop new analytical methods for pesticide detection. Methods: A fluorescent detection system was established by using Cerium based fluorescent polymer and Sm-CeO 2. As a new doped nanozyme, Sm-CeO 2 exhibits OPH-like activity to hydrolyze OPP pesticide. Results: The morphology of the prepared CFP and Sm-CeO 2 were characterized. The optimal conditions for CFP synthesis are CeCl 3 (16 mmol L −1 , 200 μL), ATP (4 mmol L −1 , 200 μL) and Tris buffer (5 mmol L −1 , 500 μL, pH 8.0). Sm-CeO 2 shows the best mimic activity to hydrolyze OPP pesticide at pH = 8.0. The results exhibit good linear relationship between fluorescent quenching effect and MP in the range of 2-50 μmol L −1. Finally, this fluorescent technique was successfully applied in Poria cocos and Semen Coicis sample. Conclusions: It is the first report on OPP detection by using CFP and doped nanozyme. The successful application in real sample indicates this method is a rapid, reliable strategy to detect OPP in Chinese herbs.

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Analysis of organophosphorus and pyrethroid pesticides in organic and conventional vegetables using QuEChERS combined with dispersive liquid-liquid microextraction based on the solidification of floating organic droplet

Cited by 77 publications

References 39 publications

Microbiological and Chemical Quality of Portuguese Lettuce—Results of a Case Study

Microbiological and Chemical Quality of Portuguese Lettuce—Results of a Case Study

A Microfluidic Paper-Based Analytical Device for Type-II Pyrethroid Targets in an Environmental Water Sample

A new fluorescent technique for pesticide detection by using metal coordination polymer and nanozyme

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