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QuEChERS

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https://www.readbyqxmd.com/read/28334957/quechers-based-method-for-pesticides-analysis-in-adipose-tissue-associated-with-rat-ovaries
#1
Nathalie Zamariola, Pedro Toledo Netto, Carla Adriene da Silva Franchi, João Lauro Viana de Camargo, Mary Rosa Rodrigues de Marchi
The concomitant exposure to low doses of various pesticides is one of the most relevant issues in human toxicology today. An experimental toxicology study was developed to evaluate the effects of this type of exposure on the reproductive capacity of females of three species of rats that were exposed to mixtures of dicofol, dieldrin, endosulfan and permethrin at low doses (LOAEL and NOAEL). In this context, we have developed a method for determining pesticides in adipose tissue (0.5 g, 49% lipid) associated with the ovaries, based on the QuEChERS (quick, easy, cheap, effective, rugged and safe) strategy...
March 14, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28330527/validation-of-multiresidue-method-for-analysis-of-31-pesticides-in-rice-using-gas-chromatography-tandem-mass-spectrometry
#2
Rahul Mondal, Ramen Kumar Kole, Anjan Bhattacharyya
Five modified QuEChERS were tested for the multiresidue analysis of 31 pesticides in rice. Rice was spiked with mixturesolution of pesticides at 10 ng/g. Method selection was based on the LODs (sensitivity) and recovery tests (accuracy) of the pesticides. Analysis was done in GC-tandem MS in multiple reaction monitoring mode with a total run time of approximately 37 min. The selected method was validated after spiking rice at 20 and 100 ng/g in rice. The performance characteristics of the method impacted for all selected pesticides were acceptable according to the guidelines for method validation (recovery of 70-120% with an RSD of <20% and r<sup>2</sup> value of ≥0...
February 22, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28317742/determination-of-hymexazol-in-26-foods-of-plant-origin-by-modified-quechers-method-and-liquid-chromatography-tandem-mass-spectrometry
#3
Zejun Jiang, Hui Li, Xiaolin Cao, Pengfei Du, Hua Shao, Fen Jin, Maojun Jin, Jing Wang
A rapid and sensitive method based on modified QuEChERS for hymexazol determination in 26 plant-derived foods using liquid chromatography tandem-mass spectrometry (LC-MS/MS) was developed. Variables affecting the separation (LC column, mobile phase additives) and clean-up effects of various dispersive phases, such as PSA, C18, GCB, MWCNTs, PEP-2, Al2O3, Florisil, and PVPP were evaluated. The method was validated using 26 matrices at spiked levels of 0.01 or 0.02, 0.05, 0.1, and 0.5mg/kg (0.05, 0.2, 0.5, and 1...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28315638/determination-of-triazines-and-triazoles-in-grapes-using-atmospheric-pressure-matrix-assisted-laser-desorption-ionization-high-resolution-mass-spectrometry
#4
Vishal Mahale, Ajeet Singh, Gayatri S Phadke, Avinash D Ghanate, Dasharath P Oulkar, Kaushik Banerjee, Venkateswarlu Panchagnula
A chromatography-free atmospheric pressure matrix-assisted laser desorption/ionization high-resolution mass spectrometry (AP-MALDI HRMS) method is described for the simultaneous and quantitative detection of triazines and triazoles in grapes. The analytes were detected reproducibly with high mass accuracy (mass error within 5 ppm) and further confirmed by collision-induced dissociation fragmentation in tandem MS. The LODs and LOQs for all the analytes were found to be in the nanogram per gram level (15-20 ng/g LOQ)...
March 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28314393/simple-cost-effective-and-sensitive-liquid-chromatography-diode-array-detector-method-for-simultaneous-determination-of-eight-sulfonylurea-herbicides-in-soya-milk-samples
#5
Tomasz Rejczak, Tomasz Tuzimski
In this study authors propose a simple, cost-effective and sensitive liquid chromatography diode array detector (HPLC-DAD) method for the simultaneous determination of eight sulfonylurea herbicides (oxasulfuron, metsulfuron-methyl, triasulfuron, rimsulfuron, chlorsulfuron, mesosulfuron-methyl, amidosulfuron and bensulfuron-methyl) in soya milk samples. QuEChERS-based extraction procedure presents good performance for all of the analytes with recoveries in the range of 61-108% and relative standard deviations (RSD%) less than 15%...
November 18, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28303785/fast-gas-chromatography-with-tandem-mass-spectrometry-analysis-of-selected-persistent-organic-pollutants-and-organophosphorus-and-synthetic-pyrethroid-pesticides-in-indian-prawn-fenneropenaeus-indicus-in-compliance-with-the-eu-mrls
#6
Durvesh Sawant, Jitendra Kelkar, Pratap Rasam, Ajit Datar, Prashant Hase, Dheeraj Handique, Ankush Bhone, Sanket Chiplunkar, Manish Hate
A fast GC with tandem MS method was developed and validated for multiresidue determination of 95 chemical contaminants(24 synthetic pyrethroids, 17 organochlorines, 17 organophosphorus compounds, 18 polycyclic aromatic hydrocarbons, and 19 polychlorinated biphenyls) in Indian prawns (<i>Fenneropenaeus indicus</i>) as per the European Union maximum residual limit requirements. Chromatographic separation and MS determination were achieved within a short run time of 18 min, without compromising sensitivity and specificity...
March 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28300025/evaluation-of-matrix-effects-in-multiresidue-analysis-of-pesticide-residues-in-vegetables-and-spices-by-lc-ms-ms
#7
Suchi Chawla, Hemlatta K Patel, Hetal N Gor, Kiran M Vaghela, Priti P Solanki, Paresh G Shah
The study was conducted to investigate matrix interferences using QuEChERS sample preparation to understand whether thedilution of matrix and/or the grouping of commodities can eliminate the need for selective individual matrix-matched standards in LC with tandem MS (MS/MS) analysis, and whether the calibration graph based on only one matrix can be used for quantification in the other matrixes. Matrix effects (MEs) were studied by comparing the slopes of calibration curves of the matrix-matched standards (diluted with mobile phase) vis-à-vis the solvent-based standards...
March 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28300022/optimization-of-a-modified-quechers-method-for-multiresidue-analysis-of-pharmaceuticals-and-personal-care-products-in-sewage-and-surface-water-by-lc-ms-ms
#8
Akanksha S Kachhawaha, Pranav M Nagarnaik, Manjusha Jadhav, Anjali Pudale Pawan K Labhasetwar, Kaushik Banerjee
A quick, sensitive multiresidue method was developed for the analysis of 19 multiclass pharmaceuticals and personal care products (PPCPs) in surface water and sewage water. The proposed modified QuEChERS method involved the extraction of water samples (10 mL) with acetonitrile (10 mL) after the addition of 1% acetic acid, 4 g magnesium sulfate, and 0.2 g ammonium acetate, and was validated in distilled water, surface water, and sewage water with respect to linearity, LOD and LOQ, precision, and accuracy. The LOD and LOQ varied within the ranges of 0...
March 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28291815/residue-analysis-and-persistence-evaluation-of-fipronil-and-its-metabolites-in-cotton-using-high-performance-liquid-chromatography-tandem-mass-spectrometry
#9
Xiaohu Wu, Yang Yu, Jun Xu, Fengshou Dong, Xingang Liu, Pengqiang Du, Dongmei Wei, Yongquan Zheng
A simple residue analytical method based on the QuEChERS approach and high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) detection was developed for the analysis of fipronil and its three metabolites in cottonseed, cotton plant and soil. The average recoveries of four test compounds from all three matrices were 78.6-108.9% at the level of 0.005 to 0.5 mg/kg, with an RSD in the range of 0.6 to 13.7%. The limit of quantification (LOQ) of the four test compounds ranged from 0.005 to 0...
2017: PloS One
https://www.readbyqxmd.com/read/28277176/accelerated-solvent-extraction-by-using-an-in-line-clean-up-approach-for-multiresidue-analysis-of-pesticides-in-organic-honey
#10
Luca Maria Chiesa, Giuseppe Federico Labella, Sara Panseri, Domenico Britti, Fabrizio Galbiati, Roberto Villa, Francesco Arioli
The worldwide loss of honeybee colonies may be due to their exposure to several contaminants (i.e., pesticides); such contamination may also have impacts on consumers' health. Therefore, it is essential to develop quick and new methods to detect several pesticide residues in honey samples. In this study, the effectiveness of accelerated solvent extraction (ASE) was compared with QuEChERS methods for the analysis of 53 pesticides in organic honey by gas chromatography-triple quadrupole mass spectrometry. Two simple and rapid ASE methods with 'in-line' clean-up were optimised and then compared with QuEChERS...
February 22, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28274427/determination-of-pesticide-residues-in-globe-artichoke-leaves-and-fruits-by-gc-ms-and-lc-ms-ms-using-the-same-quechers-procedure
#11
Ignacio Machado, Natalia Gérez, Mariela Pistón, Horacio Heinzen, María Verónica Cesio
Aiming to select the most suitable sample preparation for the multiresidue analysis of pesticides in globe artichoke (Cynara cardunculus L.), a modified QuEChERS, a matrix solid phase dispersion and a dispersive ethyl acetate extraction were compared. Trueness and precision were determined at 0.2mgkg(-1) for the three methods. The modified QuEChERS showed the best performance. The scope of the method was enlarged to 35 GC and 63 LC amenable pesticides, its overall performance was evaluated and validated to artichoke leaves and fruits according to DG-SANTE Guidelines...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28249780/multi-mycotoxin-determination-in-barley-and-derived-products-from-tunisia-and-estimation-of-their-dietary-intake
#12
C Juan, H Berrada, J Mañes, S Oueslati
A study on raw barley and derived products (barley soup and beers) was carried out to determine the natural presence of twenty-four mycotoxins by both liquid chromatography and gas chromatography coupled to tandem mass spectrometry (MS/MS). The developed multi-mycotoxin procedure was based on both SLE and QuEChERS extraction steps. 66% of analyzed samples presented mycotoxin contamination and only one sample, which was soup of barley (6 ng/g), exceeded the maximum level (ML) established by EU for OTA (5 ng/g)...
February 27, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28242945/detection-of-pesticides-in-popular-medicinal-herbs-a-modified-quechers-and-gas-chromatography-mass-spectrometry-based-approach
#13
Vandana Tripathy, Ajoy Saha, Jitendra Kumar
Although a lot of work has been conducted in the pesticide residues analysis in food matrices but the quality determination (with respect to major contaminants such as pesticide residues) in medicinal plant matrices has a long way to go. Hence a study was conducted to determine pesticide residues in four medicinal herbs, which are highly traded commodities in international market. Samples were extracted and cleaned up by modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) approach and analyzed by gas chromatograph-mass spectrometer (GC-MS)...
February 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28238322/analytical-strategies-for-organic-food-packaging-contaminants
#14
REVIEW
Yovana Sanchis, Vicent Yusà, Clara Coscollà
In this review, we present current approaches in the analysis of food-packaging contaminants. Gas and liquid chromatography coupled to mass spectrometry detection have been widely used in the analysis of some relevant families of these compounds such as primary aromatic amines, bisphenol A, bisphenol A diglycidyl ether and related compounds, UV-ink photoinitiators, perfluorinated compounds, phthalates and non-intentionally added substances. Main applications for sample treatment and different types of food-contact material migration studies have been also discussed...
February 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28225030/chemometric-assisted-quechers-extraction-method-for-post-harvest-pesticide-determination-in-fruits-and-vegetables
#15
Minmin Li, Chao Dai, Fengzhong Wang, Zhiqiang Kong, Yan He, Ya Tao Huang, Bei Fan
An effective analysis method was developed based on a chemometric tool for the simultaneous quantification of five different post-harvest pesticides (2,4-dichlorophenoxyacetic acid (2,4-D), carbendazim, thiabendazole, iprodione, and prochloraz) in fruits and vegetables. In the modified QuEChERS (quick, easy, cheap, effective, rugged and safe) method, the factors and responses for optimization of the extraction and cleanup analyses were compared using the Plackett-Burman (P-B) screening design. Furthermore, the significant factors (toluene percentage, hydrochloric acid (HCl) percentage, and graphitized carbon black (GCB) amount) were optimized using a central composite design (CCD) combined with Derringer's desirability function (DF)...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224245/evaluation-of-ms-2-workflows-in-lc-q-orbitrap-for-pesticide-multi-residue-methods-in-fruits-and-vegetables
#16
Łukasz Rajski, María Del Mar Gómez Ramos, Amadeo R Fernández-Alba
LC-Q-Orbitrap efficiency was evaluated for pesticide multi-residue analysis by using three workflows involving simultaneous MS and MS(2) analysis. They were as follows: data-dependent MS(2) (dd-MS(2)), all-ion fragmentation (AIF) and variable data-independent analysis (vDIA). These MS(2) workflows were tested for the main method validation parameters such as detection and identification capabilities, repeatability, linear range and quantitation. QuEChER acetonitrile extracts (blanks and spiked with 166 pesticides) of 11 different fruits and vegetables were used for this evaluation...
February 21, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28221947/rapid-determination-of-trace-multiresidues-of-18-sulfonamides-in-chicken-eggs-using-a-modified-quechers-method-coupled-with-ultrahigh-performance-liquid-chromatography
#17
X U Xu, Yuan-Can Xiao, Feng-Zu Hu, Dan-Dan Geng
A modified QuEChERS method was used and an ultrahigh performance liquid chromatography (UHPLC) method was developed for the rapid determination of 18 kinds of sulfonamide residues in chicken eggs. Sample preparation and cleanup conditions were carefully evaluated, and factors such as the adsorbent type and adsorption condition were key parameters in improving the cleanup. The modified QuEChERS method removed matrix interferences, and the sensitivity of the method increased about 5% for recovery and efficiency of the method...
September 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28215082/development-of-a-quechers-based-method-for-determination-of-carcinogenic-2-nitrofluorene-and-1-nitropyrene-in-rice-grains-and-vegetables-a-comparative-study-with-benzo-a-pyrene
#18
Kailin Deng, Wan Chan
Nitrated polycyclic aromatic hydrocarbons (nitro-PAHs) are ubiquitous environmental pollutants attracting increasing attention because of their potent mutagenicity to humans. Previous studies of nitro-PAHs focused on investigating their formation mechanisms and detecting them in atmospheric environment; however, few studies have reported their occurrence in food samples, and regulations on nitro-PAHs are still lacking. We report in this study the development and application of a quick, easy, cheap, effective, rugged, and safe (QuEChERS) method for determination of nitro-PAHs in rice and vegetable samples...
February 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28206877/the-quechers-approach-for-the-determination-of-pesticide-residues-in-soil-samples-an-overview
#19
REVIEW
Klaudia Pszczolińska, Monika Michel
Soil samples are complex matrixes; therefore, soil sample preparation is a critical step, and one that is usually expensive, time-consuming, and labor intensive. The quick, easy, cheap, effective, rugged, and safe (QuEChERS) method, originally developed for the determination of pesticides in fruits and vegetables, has been recently modified and adopted for the analysis of pesticides in soil. This paper reviews all aspects of sample preparation, including extraction and clean-up, and describes the applications of conventional and modified QuEChERS techniques...
November 1, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/28206876/sample-treatment-in-pesticide-residue-determination-in-food-by-high-resolution-mass-spectrometry-are-generic-extraction-methods-the-end-of-the-road
#20
Roberto Romero-González, Francisco Javier Arrebola Liébanas, Rosalía López-Ruiz, Antonia Garrido Frenich
The use of high-resolution MS (HRMS) is becoming popular in laboratories for the determination of pesticide residues in food commodities. The recent improvements in the instrumentation have helped to increase the number of active compounds and transformation products that can be monitored within a simple chromatographic run. However, prior to instrumental determination, it is necessary to perform a nonspecific, or generic, sample treatment that allows the efficient extraction of several compounds with very relevant differences in their physical and chemical properties...
November 1, 2016: Journal of AOAC International
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