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https://www.readbyqxmd.com/read/28206877/the-quechers-approach-for-the-determination-of-pesticide-residues-in-soil-samples-an-overview
#1
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
#2
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
https://www.readbyqxmd.com/read/28206875/multiclass-multiresidue-methods-mrms-for-the-determination-of-pesticides-by-modern-extraction-and-detection-techniques-the-combination-of-quechers-and-high-resolution-mass-spectrometry-hrms
#3
https://www.readbyqxmd.com/read/28153263/quechers-extraction-for-multi-residue-analysis-of-pcbs-pahs-pbdes-and-pcdd-fs-in-biological-samples
#4
Pierre-Luc Cloutier, Frédérik Fortin, Paule Emilie Groleau, Pauline Brousseau, Michel Fournier, Mélanie Desrosiers
In this study, a fast and rugged method is presented for the analysis of PCBs, PAHs, PBDEs and PCDD/Fs in biological tissues using a simple Quick, Easy, Cheap, Efficient, Rugged and Safe (QuEChERS) extraction and a clean-up by Gel Permeation Chromatography (GPC) and silica Solid Phase Extraction (SPE). Development was performed on blue mussels (Mytilus edulis) and Atlantic salmon (Salmo salar) for evaluation of two ranges of lipid and water content of biological tissues. Statistical validation was performed with Atlantic salmon samples...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28135698/graphene-oxide-sio2-nanocomposite-as-the-adsorbent-for-extraction-and-preconcentration-of-plant-hormones-for-hplc-analysis
#5
Xiaona Zhang, Jiahua Niu, Xiaoting Zhang, Rui Xiao, Minghua Lu, Zongwei Cai
In this research, a modified Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) method based on graphene oxide@SiO2(SiO2@GO) nanocomposite as adsorbent of dispersive solid-phase extraction (dSPE) combined with high performance liquid chromatography (HPLC) for the analysis of four plant hormones in different plants was established. The as-prepared SiO2@GO was characterized by scanning electron microscopy, transmission electron microscopy and infrared spectroscopy. The experimental conditions for dSPE, including the ratio of material to liquid, pH of sample, adsorption and desorption time, desorption temperature as well as desorption solution, were investigated...
January 5, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28126629/evolution-of-novel-sorbents-for-effective-clean-up-of-honeybee-matrix-in-highly-toxic-insecticide-lc-ms-ms-analysis
#6
Piotr Kaczynski, Izabela Hrynko, Bozena Lozowicka
Highly toxic insecticides (HTIs) belonging to different chemical groups are dangerous to pollinating organisms, even in sublethal doses. An important objective of this study was to develop a method to determine over fifty HTIs at very low concentrations in the bee matrix. The novelty of this research involved obtaining extract completely free from beewaxes, lipids and proteins using EMR-lipid (enhanced matrix removal-lipid), chitin and Z-Sep+ (zirconium oxide and C18 dual-bonded to silica) as clean-up sorbents...
January 23, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28107999/determination-of-sulfonamides-in-animal-tissues-by-modified-quechers-and-liquid-chromatography-tandem-mass-spectrometry
#7
Ching-Hsuan Wen, Shu-Ling Lin, Ming-Ren Fuh
In this study, the salting-out solvent extraction and dispersive solid-phase extraction (dSPE) clean-up steps in QuEChERS (quick, easy, cheap, effective, rugged, and safe) method were optimized to reduce matrix effect and efficiently extract target sulfonamides from a variety of edible animal tissues. The extracted sulfonamides were then analyzed using liquid chromatography tandem mass spectrometry (LC-MS/MS). Good extraction recoveries (74.0-100.3% in five different sources of animal tissues; n=3) with acceptable matrix effect (<10%, except for liver samples) were obtained using the proposed method...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107942/stereoselective-quantification-of-triticonazole-in-vegetables-by-supercritical-fluid-chromatography
#8
Qi Tan, Jun Fan, Ruiqi Gao, Rujian He, Tai Wang, Yaomou Zhang, Weiguang Zhang
A highly fast analytical method though supercritical fluid chromatography (SFC) has been developed to quantify triticonazole enantiomers in cucumbers and tomatoes. Effects of organic modifier type and concentration on chiral separation and quantification of standard solution as well as matrix-matched standard solutions have been studied in detail. Among three organic modifiers, better separation of triticonazole racemate was achieved with 20% ethanol (v/v). The run time in SFC (ca 3min) with CO2-ethanol (80:20, v/v) as the mobile phase was six-fold shorter than HPLC analysis (about 18min)...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107701/simultaneous-determination-of-amantadine-rimantadine-and-memantine-in-processed-products-chicken-tissues-and-eggs-by-liquid-chromatography-with-tandem-mass-spectrometry
#9
Yumi Tsuruoka, Takayuki Nakajima, Maki Kanda, Hiroshi Hayashi, Yoko Matsushima, Souichi Yoshikawa, Marie Nagata, Hiroshi Koike, Chieko Nagano, Kotaro Sekimura, Tsuneo Hashimoto, Ichiro Takano, Tetsuya Shindo
A simultaneous determination of amantadine, rimantadine, and memantine in processed products (deep-fried chicken, fried chicken, fried quail egg, and grilled chicken) with liquid chromatography tandem mass spectrometry (LC-MS/MS) was developed. This new method was also applicable for chicken tissue (muscle, liver, and gizzard) and eggs. The chromatographic separation was performed on a Kinetex(®) XB-C18 core-shell technology column using a mobile phase of acetonitrile and 0.1% formic acid in a 10mmol/L ammonium formate solution, resulting in the complete separation of isomers (rimantadine and memantine) and any other obstructive peaks from the sample matrices...
January 11, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28106339/determination-of-19-sulfonamides-residues-in-pork-samples-by-combining-quechers-with-dispersive-liquid-liquid-microextraction-followed-by-uhplc-ms-ms
#10
Xiaojing Li, Hong Yu, Rongfei Peng, Pingsheng Gan
A new simple and rapid pretreatment method for simultaneous determination of 19 sulfonamides in pork samples was developed through combining the QuEChERS method with dispersive liquid-liquid microextraction followed by ultra high performance liquid chromatography with tandem mass spectrometry. The sample preparation involves extraction/partitioning with QuEChERS method followed by dispersive liquid-liquid microextraction using tetrachloroethane as extractive solvent and the acetonitrile extract as dispersive solvent which obtained by QuEChERS...
January 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28099798/development-of-a-quechers-based-method-for-the-simultaneous-determination-of-acidic-pesticides-their-esters-and-conjugates-following-alkaline-hydrolysis
#11
Angelika Steinborn, Lutz Alder, Madeleine Spitzke, Daniela Dörk, Michelangelo Anastassiades
An analytical procedure was developed allowing the simultaneous determination of acidic pesticides and their conjugates by addition of an alkaline hydrolysis step into the European Union (EU) version of the QuEChERS method. The procedure resulted additionally in hydrolysis of most esters of phenoxy acids. On the basis of information from metabolism studies and the hydrolytic conditions employed in supervised field trials as well as results on the influence of physical and chemical parameters (temperature, time, type of solvent, type of matrix), alkaline hydrolysis for 30 min at 40 °C was deemed a good compromise for the determination of residues of 2,4-D, dichlorprop, fluazifop, haloxyfop, MCPA, and MCPB...
February 7, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28093672/influence-of-quechers-modifications-on-recovery-and-matrix-effect-during-the-multi-residue-pesticide-analysis-in-soil-by-gc-ms-ms-and-gc-ecd-npd
#12
Bożena Łozowicka, Ewa Rutkowska, Magdalena Jankowska
A QuEChERS extraction followed by GC/MS/MS and GC-μECD/NPD for 216 pesticide and metabolites determination in soil simultaneously were developed and compared. Volume of water, volume and polarity of solvent, and cleanup sorbents (C18, GCB, PSA) were optimized. The QuEChERS with and without purification step were applied to estimate effectiveness of the method. The recovery and matrix effect (ME) were critical parameters within each tested procedure. The optimal method without cleanup was validated. Accuracy (expressed as recovery), precision (expressed as RSD), linearity, LOQ, and uncertainty were determined...
January 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28090975/pesticide-residues-in-leafy-vegetables-and-human-health-risk-assessment-in-north-central-agricultural-areas-of-chile
#13
Sebastian Elgueta, Stella Moyano, Paulina Sepúlveda, Carlos Quiroz, Arturo Correa
To investigate pesticide residue concentrations and potential human health risk, a study was conducted in 118 leafy vegetable samples collected in 2014-2015 from the North Central agricultural areas of Chile. The pesticides residues were determined using the multiresidue QuEChERS method using gas chromatography as well as high-performance liquid chromatography. The results indicated that 27% of the total samples contained pesticide residues above the maximum residue limits of each active ingredient. The maximum estimated daily intake obtained for carbon disulphide (CS2), methamidophos, azoxystrobin and cypermethrin were 0...
January 16, 2017: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/28089066/evaluation-and-prevention-of-the-negative-matrix-effect-of-terpenoids-on-pesticides-in-apples-quantification-by-gas-chromatography-tandem-mass-spectrometry
#14
Géraldine Giacinti, Christine Raynaud, Sophie Capblancq, Valérie Simon
The sample matrix can enhance the gas chromatography signal of pesticide residues relative to that obtained with the same concentration of pesticide in solvent. This paper is related to negative matrix effects observed in coupled gas chromatography-mass spectrometry ion trap (GC/MS(2)) quantification of pesticides in concentrated extracts of apple peel prepared by the Quick Easy Cheap Effective Rugged and Safe (QuEChERS) method. It is focused on the pesticides most frequently used on the apple varieties studied, throughout the crop cycle, right up to harvest, to combat pests and diseases and to improve fruit storage properties...
December 21, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28069166/evaluation-and-prevention-of-the-negative-matrix-effect-of-terpenoids-on-pesticides-in-apples-quantification-by-gas-chromatography-tandem-mass-spectrometry
#15
Géraldine Giacinti, Christine Raynaud, Sophie Capblancq, Valérie Simon
The sample matrix can enhance the gas chromatography signal of pesticide residues relative to that obtained with the same concentration of pesticide in solvent. This paper is related to negative matrix effects observed in coupled gas chromatography-mass spectrometry ion trap (GC/MS(2)) quantification of pesticides in concentrated extracts of apple peel prepared by the Quick Easy Cheap Effective Rugged and Safe (QuEChERS) method. It is focused on the pesticides most frequently used on the apple varieties studied, throughout the crop cycle, right up to harvest, to combat pests and diseases and to improve fruit storage properties...
February 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28064506/simultaneous-analysis-of-3-mcpd-and-1-3-dcp-in-asian-style-sauces-using-quechers-extraction-and-gas-chromatography-triple-quadrupole-mass-spectrometry
#16
Susan Genualdi, Patricia Nyman, Lowri DeJager
Acid hydrolyzed vegetable protein (aHVP) is used for flavoring a wide variety of foods and also in the production of nonfermented soy sauce. During the production of aHVP, chloropropanols including 3-monochloropropane-1,2-diol (3-MCPD) and 1,3 dichloropropane-2-ol (1,3-DCP) can be formed through the reaction of the hydrochloric acid catalyst and residual fat and the reaction of 3-MCPD with acetic acid, respectively. 3-MCPD is a carcinogen, and 1,3-DCP has been classified as a genotoxic carcinogen. The European Union (EU) has set a maximum concentration of 0...
February 1, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28056418/multiclass-pesticide-residue-analysis-in-fish-muscle-and-liver-on-one-step-extraction-cleanup-strategy-coupled-with-liquid-chromatography-tandem-mass-spectrometry
#17
Piotr Kaczyński, Bożena Łozowicka, Maciej Perkowski, Julia Szabuńko
The analysis of pesticide residues in fish samples is challenging due to the low concentrations and large number of analytes that need to be monitored and quantified in a complex matrix. This is the first report providing a novel one-step extraction-cleanup strategy for simultaneous analysis of over 340 pesticides in a fatty fish and liver matrix, coupled with liquid-chromatography tandem mass spectrometry. The samples of fish muscle and liver were prepared according to the modified QuEChERS (quick, easy, cheap, effective, rugged and safe) procedure, wherein the extraction and cleanup protocol were integrated into one step...
April 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28043257/-quechers-pretreatment-method-for-determination-of-organophosphate-pesticide-and-raticide-in-whole-blood
#18
F Dong, H L Li, J Ma, B Zhou, Y Yu
Objective: To investigate the QuEChERS pretreatment method combined with on-line gel permeation chromatography-gas chromatography/mass spectrometry (GPC-GC/MS) for the determination of organophosphate pesticide and raticide in whole blood. Methods: The samples were pretreated with QuEChERS. A total of 1 ml acetonitrile was added to 1 ml whole blood sample for extraction, and 0.5 g sodium chloride was added. The mixture was oscillated for 15 seconds at a temperature of 4° C and centrifuged at a high speed of 12 000 r/min for 10 minutes...
October 20, 2016: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28040892/use-of-onion-extract-as-a-dairy-cattle-feed-supplement-monitoring-propyl-propane-thiosulfonate-as-a-marker-of-its-effect-on-milk-attributes
#19
Paloma Abad, Natalia Arroyo-Manzanares, Lidia Gil, Ana M García-Campaña
Onion extract is used as a feed supplement for the diet of dairy cows, acting as inhibitor of methane production; however, its properties could alter sensory attributes of milk. In this work, we propose a method to evaluate the influence of this extract on milk properties, using propyl propane thiosulfonate (PTSO) as a marker. PTSO is extracted using a quick, easy, cheap, effective, rugged, and safe procedure and monitored by high-performance liquid chromatography with ultraviolet detection. The method was applied to milk samples obtained from 100 dairy cows fed during 2 months with enriched feed...
February 1, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28034504/revisiting-quick-easy-cheap-effective-rugged-and-safe-parameters-for-sample-preparation-in-pesticide-residue-analysis-of-lettuce-by-liquid-chromatography-tandem-mass-spectrometry
#20
Fernanda Ribeiro Begnini Konatu, Márcia Cristina Breitkreitz, Isabel Cristina Sales Fontes Jardim
A new analytical method using a quick, easy, cheap, effective, rugged, and safe (QuEChERS) procedure for multi-residue determination of 16 multiclass pesticides in five different types of lettuce was developed using high-performance liquid chromatography coupled to electrospray ionization tandem mass spectrometry. The QuEChERS procedure was optimized in terms of extractor solvent, partitioning salts and clean-up salts, through recovery, gravimetric analysis and matrix-effect studies. Microwave extraction and the use of disposable pipette extraction in the clean-up step were also tested, providing interesting alternatives to the traditional QuEChERS method, depending on the pesticides properties...
January 27, 2017: Journal of Chromatography. A
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