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https://www.readbyqxmd.com/read/28807548/application-of-a-simple-column-switching-ion-chromatography-technique-for-removal-of-matrix-interferences-and-sensitive-fluorescence-determination-of-acidic-compounds-pharmaceutical-drugs-in-complex-samples
#1
Nadeem Muhammad, Qamar Subhani, Fenglian Wang, Dandan Guo, Qiming Zhao, Shuchao Wu, Yan Zhu
This work illustrates the introduction of a simple, rugged and flexible column-switching ion chromatography (IC) technique for an automated on-line QuEChERS extracted samples extracts washing followed by sensitive fluorescence (FLD) determination of five acidic pharmaceutical drugs namely; clofibric acid (CLO), ibuprofen (IBU), aspirin (ASP), naproxen (NAP) and flurobrofen (FLU) in three complex samples (spinach, apple and hospital sewage sludge). An old anion exchange column IonPac(®) AS11-HC was utilized as a pre-treatment column for on-line washing of inorganic and organic interferences followed by isocratic separation of five acidic drugs with another anion exchange IonPac(®) AS12A analytical column by exploiting the column-switching technique...
July 5, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28806686/simultaneous-determination-of-16-macrolide-antibiotics-and-4-metabolites-in-milk-by-using-quick-easy-cheap-effective-rugged-and-safe-extraction-quechers-and-high-performance-liquid-chromatography-tandem-mass-spectrometry
#2
Weie Zhou, Yun Ling, Tong Liu, Yuan Zhang, Jianzhi Li, Hongna Li, Wenjie Wu, Shoujun Jiang, Feng Feng, Fei Yuan, Feng Zhang
A novel analytical method was developed and validated for simultaneous analysis of 16 macrolide antibiotics and 4 metabolites in milk. A modified quick, easy, cheap, effective, rugged, and safe extraction method (QuEChERS) optimized by response surface methodology (RSM) was used for sample preparation. All the drugs were subsequently separated and detected by high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS), using roxithromycin as internal standards for maximum accuracy and precision...
August 5, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28803648/automated-multi-filtration-cleanup-with-nitrogen-enriched-activated-carbon-material-as-pesticide-multi-residue-analysis-method-in-representative-crop-commodities
#3
Yuhong Qin, Jingru Zhang, Yifan Li, Qiuxiao Wang, Yangliu Wu, Lanshu Xu, Xiaojuan Jin, Canping Pan
An automated multi-filtration cleanup (Auto m-FC) method with nitrogen-enriched activated carbon material based on modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) extracts was developed. It was applied to pesticide multi-residue analysis in six representative crop commodities. The automatic device was aimed to improve the cleanup efficiency and reduce manual operation workload in cleanup step. By controlling extracts volume, flow rate and Auto m-FC cycles, the device could finish cleanup process accurately...
August 5, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28799051/measuring-the-internal-concentration-of-volatile-organic-compounds-in-small-organisms-using-micro-quechers-coupled-to-lvi-gc-ms-ms
#4
Denise Kurth, Martin Krauss, Tobias Schulze, Werner Brack
There is an increasing demand for analytical tools to measure the internal concentrations of xenobiotic pollutants in small organisms. Such tools are required to determine exposure in ecotoxicological studies yet avoid sophisticated clean-up and enrichment techniques or large-scale experimental design. Thus, this paper presents a modified QuEChERS method coupled to gas chromatography tandem mass spectrometry (GC-MS/MS) for small volume organic samples. Ten zebrafish (Danio rerio) embryos were exposed to a 46-compound mixture at 10 ng/mL...
August 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28794337/determination-of-polychlorinated-biphenyls-in-fish-tissues-from-shanghai-seafood-markets-using-a-modified-quechers-method
#5
Yunyun Cui, Zhengquan Wang, Jian Cong, Liping Wang, Yuan Liu, Xichang Wang, Jing Xie
Optimized Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) pretreatment methods for determination of six polychlorinated biphenyls (PCBs) residues in fish and aquatic invertebrates samples were investigated. Large volume injection (LVI) coupled gas chromatography tandem mass spectrometry (GC-MS/MS) with selected reaction monitoring (SRM) was used to provide a very sensitive and selective means of analyzing PCBs via internal calibration. Three analytical processes were validated and compared, and the florisil Celite(®)545 pretreatment method was selected...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28783000/multiclass-mycotoxin-analysis-in-edible-oils-using-a-simple-solvent-extraction-method-and-liquid-chromatography-with-tandem-mass-spectrometry
#6
Taeyong Eom, Hyun-Deok Cho, Junghyun Kim, Mihee Park, Jinyoung An, Moosung Kim, Sheen-Hee Kim, Sang Beom Han
A simple and rapid method for the simultaneous determination of eleven mycotoxins-aflatoxins B1, B2, G1, and G2; fumonisins B1, B2, and B3; ochratoxin A; zearalenone; deoxynivalenol; and T-2 toxin-in edible oils was established using liquid chromatography tandem mass spectrometry (LC-MS/MS). In this study, QuEChERS, QuEChERS with dispersive liquid-liquid microextraction, and solvent extraction were examined for sample preparation. Among these methods, solvent extraction with a mixture of formic acid/acetonitrile (5/95, v/v) successfully extracted all target mycotoxins...
August 7, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28781908/simultaneous-analysis-of-ursolic-acid-and-oleanolic-acid-in-guava-leaves-using-quechers-based-extraction-followed-by-high-performance-liquid-chromatography
#7
Chang Xu, Yiyi Liao, Chunyan Fang, Makoto Tsunoda, Yingxia Zhang, Yanting Song, Shiming Deng
In this paper, a novel method of QuEChERS-based extraction coupled with high-performance liquid chromatography has been developed for the simultaneous determination of ursolic acid (UA) and oleanolic acid (OA) in guava leaves. The QuEChERS-based extraction parameters, including the amount of added salt, vortex-assisted extraction time, and absorbent amount, and the chromatographic conditions were investigated for the analysis of UA and OA in guava leaves. Under the optimized conditions, the method showed good linearity over a range of 1-320 μg mL(-1), with correlation coefficients above 0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28774714/evaluation-of-an-alternative-fluorinated-sorbent-for-dispersive-solid-phase-extraction-clean-up-of-the-quick-easy-cheap-effective-rugged-and-safe-method-for-pesticide-residues-analysis
#8
Manoel L Martins, Magali Kemmerich, Osmar D Prestes, Liane Maldaner, Isabel C S F Jardim, Renato Zanella
In this study, the efficiency of a new fluorinated sorbent for dispersive solid-phase extraction (d-SPE) clean-up in extracts provided by the QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) acetate method from tomato and sweet pepper samples was evaluated by ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS). Clean-up using d-SPE technique has been widely used associated with the QuEChERS method. The most commonly sorbents used in d-SPE are primary secondary amine (PSA), octadecylsilane (C18) and graphitized carbon black (GCB), which are indicated to remove sugars, fatty acids, pigments, among others...
July 26, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28757570/monitoring-of-pesticide-residues-in-commonly-used-fruits-and-vegetables-in-kuwait
#9
Mustapha F A Jallow, Dawood G Awadh, Mohammed S Albaho, Vimala Y Devi, Nisar Ahmad
The presence of pesticide residues in primary and derived agricultural products raises serious health concerns for consumers. The aim of this study was to assess the level of pesticide residues in commonly consumed fruits and vegetables in Kuwait. A total of 150 samples of different fresh vegetables and fruits were analyzed for the presence of 34 pesticides using the quick easy cheap effective rugged and safe (QuEChERS) multi-residue extraction, followed by gas chromatography-mass spectrometry (GC-MS) or liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
July 25, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28756171/quantification-of-16-%C3%AE-lactams-in-chicken-muscle-by-quechers-extraction-and-uplc-q-orbitrap-ms-with-parallel-reaction-monitoring
#10
Qing Chen, Xiao-Dong Pan, Bai-Fen Huang, Jian-Long Han
A method is described for the analysis of 16 β-lactams in chicken muscle by UPLC-quadrupole(Q)-Orbitrap-MS with parallel reaction monitoring (PRM). QuEChERS approach includes clean-up step by sorbent of primary-secondary amine (PSA) and C18 was adopted for sample preparation. Q-Orbitrap with PRM showed high sensitivity with limits of detection (LODs) ranged from 0.01μgkg(-1) to 0.35μgkg(-1). The method was further validated by intra- and inter-day test with spiking levels less than MRLs (maximum residue limits, the European Union)...
July 21, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28738653/development-of-an-efficient-method-for-multi-residue-analysis-of-160-pesticides-in-herbal-plant-by-ethyl-acetate-hexane-mixture-with-direct-injection-to-gc-ms-ms
#11
Sherif M Taha, Sohair A Gadalla
A simple and efficient multi residue method was developed, for the analysis of 160 pesticides by GC-MS/MS in herbal plants. The developed method employs pesticide residue extraction by EtAC/ n. hexane (6:4) with a cleanup step using florisil/ PSA mixture. The optimized conditions have resulted in lower co-extracted matrix components than those extracted using EtAC or MeCN (QuEChERS method), according to FTIR and full scan GC/MS analyses. In addition, the developed method (EtAC/ Hexane) eliminates the evaporation step that is usually performed when using MeCN as an extraction solvent prior to the GC-MS/MS injection...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738648/matrix-interference-evaluation-employing-gc-and-lc-coupled-to-triple-quadrupole-tandem-mass-spectrometry
#12
S Uclés, A Lozano, A Sosa, P Parrilla Vázquez, A Valverde, A R Fernández-Alba
Gas and liquid chromatography coupled to triple quadrupole tandem mass spectrometry are currently the most powerful tools employed for the routine analysis of pesticide residues in food control laboratories. However, whatever the multiresidue extraction method, there will be a residual matrix effect making it difficult to identify/quantify some specific compounds in certain cases. Two main effects stand out: (i) co-elution with isobaric matrix interferents, which can be a major drawback for unequivocal identification, and therefore false negative detections, and (ii) signal suppression/enhancement, commonly called the "matrix effect", which may cause serious problems including inaccurate quantitation, low analyte detectability and increased method uncertainty...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28720218/pesticide-analysis-in-coffee-leaves-using-a-quick-easy-cheap-effective-rugged-and-safe-approach-and-liquid-chromatography-tandem-mass-spectrometry-optimization-of-the-clean-up-step
#13
Maria Teresa Salles Trevisan, Robert Wyn Owen, Pau Calatayud-Vernich, Andrea Breuer, Yolanda Picó
An analytical method using a quick, easy, cheap, effective, rugged and safe (QuEChERS) procedure for multi-residue determination of 52 pesticides in coffee leaf extractshas been developed and validated according to SANTE/11945/2015 guidelines. Different sorbent combinations for dispersive solid phase extraction (d-SPE) clean-up as well as dispersive liquid-liquid microextraction (DLLME) were tested. The relative standard deviations (RSDs) for the recovery of 87-94% of pesticides added to coffee leaf extracts,was ≤20% for samples spiked at concentrations up to 50ng*g(-1) depending on the clean-up procedures...
July 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28720177/validation-of-multiresidue-method-for-analysis-of-31-pesticides-in-rice-using-gas-chromatography-tandem-mass-spectrometry
#14
Rahul Mondal, Ramen Kumar Kole, Anjan Bhttacharyya
Five modified QuEChERS were tested for the multiresidue analysis of 31 pesticides in rice. Rice was spiked with mixture solution 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 r2 value of ≥0...
July 1, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28712016/a-survey-of-pesticide-accumulation-in-a-specialist-feeder-the-koala-phascolarctos-cinereus
#15
Caroline Marschner, Damien P Higgins, Mark B Krockenberger
To maintain profitability in Australia's agricultural and urban landscapes pesticides are used throughout the range of koala habitats. The koala is a specialist feeder, reliant on metabolic enzyme capacities to utilise a toxic diet of eucalypt leaves and is potentially prone to adverse effects when xenobiotic interactions between dietary and anthropogenic xenobiotics occur. The aim of this study was to investigate accumulation of frequently used pesticides in wild koalas in 4 areas of New South Wales and Queensland...
July 15, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28708032/comparison-of-a-newly-developed-liquid-chromatography-with-tandem-mass-spectrometry-method-and-enzyme-linked-immunosorbent-assay-for-detection-of-multiple-mycotoxins-in-red-pepper-powder
#16
Sunyoung Kim, Sanghee Lee, Tae-Gyu Nam, Dongwon Seo, Miyoung Yoo
In this study, we aimed to establish a method for determination of multiple mycotoxins such as aflatoxins, ochratoxin A, and zearalenone in red pepper powder samples based on the quick, easy, cheap, effective, rugged, and safe (QuEChERS) approach for extraction and cleanup, with detection and quantification by high-performance liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) in both positive- and negative-ion modes. The developed LC-MS/MS analytical method was compared with an enzyme-linked immunosorbent assay (ELISA) to improve the reliability of our developed method...
July 14, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28707620/a-quechers-based-sample-preparation-method-for-the-analysis-of-5-nitroimidazoles-in-bovine-milk-by-hplc-dad
#17
Tomasz Tuzimski, Tomasz Rejczak
In this study, a simple, cost-effective, and sensitive HPLC diode-array detection method was developed for thesimultaneous determination of six different 5-nitroimidazoles [metronidazole, 2-hydroxymethyl-1-methyl-5-nitro-(1)H-imidazole, dimetridazole (DMZ), ronidazole, ornidazole, and ipronidazole] in bovine milk samples. A QuEChERS-based sample preparation procedure was optimized by evaluating different cleanup sorbents, including zirconium-based sorbents (Z-Sep and Z-Sep+), C18, and primary-secondary amine (PSA), as well as EMR-Lipid cleanup solution...
July 13, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28699157/determination-of-cyclic-volatile-methylsiloxanes-in-personal-care-products-by-gas-chromatography
#18
Herbert M Brothers, Thomas Boehmer, Roy A Campbell, Steven Dorn, Joel J Kerbleski, Sarah Lewis, Christian Mund, Donald Pero, Kenji Saito, Michael Wieser, Wolfgang Zoller
OBJECTIVE: Organosiloxanes are prevalent in personal care products (PCPs) due to the desired properties they impart in the usage and application of such products. However, the European Chemical Agency (ECHA) has recently published restriction proposals on the amount of two cyclic siloxanes, octamethylcyclotetrasiloxane (D4) and decamethylcyclotetrasiloxane (D5) allowed in wash off products such as shampoos and conditioners which are discharged down the drain during consumer use. This legislation will require that reliable analytical methods are available for manufacturers and government agencies to use in documenting compliance with the restrictions...
July 12, 2017: International Journal of Cosmetic Science
https://www.readbyqxmd.com/read/28692891/degradation-studies-of-quizalofop-p-and-related-compounds-in-soils-using-liquid-chromatography-coupled-to-low-and-high-resolution-mass-analyzers
#19
Rosalía López-Ruiz, Roberto Romero-González, José Luis Martínez Vidal, Manuel Fernández-Pérez, Antonia Garrido Frenich
A comprehensive degradation study of quizalofop-p, quizalofop-p-ethyl, quizalofop-p-tefuryl and propaquizafop in soil samples have been firstly performed using ultra high performance liquid chromatography coupled to Orbitrap mass spectrometry (UHPLC-Orbitrap-MS). Thus, metabolites or degradation products, such as CHHQ (dihydroxychloroquinoxalin), CHQ (6-chloroquinoxalin-2-ol), PPA ((R)-2-(4-hydroxyphenoxy)propionic acid) and 2,3-dihydroxyquinoxaline were also monitored. An extraction procedure based on QuEChERS procedure was used...
July 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28681076/a-multiresidue-method-for-the-analysis-of-90-pesticides-16-pahs-and-22-pcbs-in-honey-using-quechers-spme
#20
Josephine Al-Alam, Ziad Fajloun, Asma Chbani, Maurice Millet
An optimized analytical method was developed for the simultaneous analysis of 90 pesticides, 16 polycyclic aromatic hydrocarbons, and 22 polychlorinated biphenyls. The method was based on quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction using acetonitrile followed by a dispersive solid-phase extraction cleanup using primary-secondary amine and octadecyl (C18). The extract obtained was concentrated by evaporation and then reconstituted with acetonitrile to prepare it for chromatographic analysis by liquid chromatography-triple-quadrupole tandem mass spectrometry and gas chromatography-ion-trap tandem mass spectrometry, which was preceded by a preconcentration step using solid-phase microextraction with appropriate fibers...
August 2017: Analytical and Bioanalytical Chemistry
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