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https://www.readbyqxmd.com/read/28631158/rapid-and-reliable-steroid-hormone-profiling-in-tursiops-truncatus-blubber-using-liquid-chromatography-tandem-mass-spectrometry-lc-ms-ms
#1
Ashley S P Boggs, Tracey B Schock, Lori H Schwacke, Thomas M Galligan, Jeanine S Morey, Wayne E McFee, John R Kucklick
Monitoring of marine mammal steroid hormone status using matrices alternative to blood is desirable due to the ability to remotely collect samples, which minimizes stress to the animal. However, measurement techniques in alternative matrices such as blubber described to date are limited in the number and types of hormones measured. Therefore, a new method using bead homogenization to QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) extraction, C18 post extraction cleanup and analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS) was developed and applied to the measurement of hormone suites in bottlenose dolphin blubber...
June 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28624638/the-fate-of-spirotetramat-and-dissipation-metabolites-in-apiaceae-and-brassicaceae-leaf-root-and-soil-system-under-greenhouse-conditions-estimated-by-modified-quechers-lc-ms-ms
#2
Bożena Łozowicka, Patrycja Mojsak, Piotr Kaczyński, Rafał Konecki, Andrzej Borusiewicz
The aim of this study was to investigate the dissipation of spirotetramat and its four metabolites (B-enol, B-keto, B-mono and B-glu) in different parts of vegetables belong to the minor crops (Appiacea and Brassicaceae) and soil from cultivation. The challenge of this study was to apply an optimized clean up step in QuEChERS to obtain one universal sorbent for different complex matrices like leaves with high levels of pigments, roots containing acids, sugars, polyphenolls and pigments and soil with organic ingredients...
June 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28609661/the-use-of-pesticides-in-belgian-illicit-indoor-cannabis-plantations
#3
Eva Cuypers, Wouter Vanhove, Joachim Gotink, Arne Bonneure, Patrick Van Damme, Jan Tytgat
Cannabis (Cannabis spp.) use and cultivation continue to increase in many (European) countries. The illicit indoor cannabis plantations that supply Belgian and European cannabis markets create problems and concerns about health and safety of intervention staff, dismantling companies, the direct environment of cannabis plantations and, eventually, of cannabis users. Main risks may come from pesticide residues on plants, cultivation infrastructure and materials; left-over plant growth-promoting substances; mycotoxins from fungal pathogens on harvested plants; and/or high levels of cannabinoids in cannabis plant parts for consumption...
May 25, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28605838/dietary-risk-assessment-of-pesticides-from-vegetables-and-drinking-water-in-gardening-areas-in-burkina-faso
#4
Edouard Lehmann, Nuria Turrero, Marius Kolia, Yacouba Konaté, Luiz Felippe de Alencastro
Vegetables and water samples have been collected around the lake of Loumbila in Burkina Faso. Pesticides residues in food commodities were analyzed using a modified QuEChERS extraction method prior analysis on GC-MS and UPLC-MS/MS of 31 pesticides. Maximum Residue Limits (MRLs) were exceeded in 36% of the samples for seven pesticides: acetamiprid, carbofuran, chlorpyrifos, lambda-cyhalothrin, dieldrin, imidacloprid and profenofos. Exceedance of MRLs suggests a risk for the consumers and limits the opportunities of exportation...
June 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28604234/effects-of-milling-on-extraction-efficiency-of-incurred-pesticides-in-cereals
#5
Susan S Herrmann, Parvaneh Hajeb, Gitte Andersen, Mette E Poulsen
This study investigated the effects of particle size and milling temperature on the extraction efficiencies of pesticide residues from cereal flour. Samples of cereal grains (barley, oat, rye and wheat) were milled using a centrifugal mill with four different sieves (0.2, 1.0, 3.0 and 5.0 mm) or a knife mill both at room temperature and after freezing of the grain at -80 ºC overnight. The incurred pesticides in the test materials were extracted by the QuEChERS method and analysed by LC-MS/MS and GC-MS/MS. The particle size distribution for the milled samples was determined using a vibratory sieve shaker...
June 12, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28602282/multi-class-determination-of-undesirables-in-aquaculture-samples-by-gas-chromatography-tandem-mass-spectrometry-with-atmospheric-pressure-chemical-ionization-a-novel-approach-for-polycyclic-aromatic-hydrocarbons
#6
T Portolés, B Garlito, Jaime Nácher-Mestre, M H G Berntssen, J Pérez-Sánchez
In this work, a method for the analysis of 24 PAHs in 19 different matrices, including fish tissues, feeds and feed ingredients, has been developed using gas chromatography coupled to triple quadrupole tandem mass spectrometry with atmospheric pressure chemical ionization source (GC-APCI-MS/MS). The method is based on a modification of the unbuffered QuEChERS method, using freezing as an additional clean-up step and applying a 20-fold dilution factor to the final extract. The procedure was also tested for 15 pesticides and 7 polychlorinated biphenyl (PCB) congeners in order to widen the scope of the method...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28585083/multiclass-analytical-method-for-the-determination-of-natural-synthetic-steroid-hormones-phytoestrogens-and-mycoestrogens-in-milk-and-yogurt
#7
Bárbara Socas-Rodríguez, Darina Lanková, Kateřina Urbancová, Veronika Krtková, Javier Hernández-Borges, Miguel Ángel Rodríguez-Delgado, Jana Pulkrabová, Jana Hajšlová
Within this study, a new method enabling monitoring of various estrogenic substances potentially occurring in milk and dairy products was proposed. Groups of compounds fairly differing in physico-chemical properties and biological activity were analyzed: four natural estrogens, four synthetic estrogens, five mycoestrogens, and nine phytoestrogens. Since they may pass into milk mainly in glucuronated and sulfated forms, an enzymatic hydrolysis was involved prior to the extraction based on the QuEChERS methodology...
June 6, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28583391/rapid-determination-of-9-aromatic-amines-in-mainstream-cigarette-smoke-by-modified-dispersive-liquid-liquid-microextraction-and-ultraperformance-convergence-chromatography-tandem-mass-spectrometry
#8
Huimin Deng, Fei Yang, Zhonghao Li, Zhaoyang Bian, Ziyan Fan, Ying Wang, Shanshan Liu, Gangling Tang
Aromatic amines in mainstream cigarette smoke have long been monitored due to their carcinogenic toxicity. In this work, a reliable and rapid method was developed for the simultaneous determination of 9 aromatic amines in mainstream cigarette smoke by modified dispersive liquid liquid microextraction (DLLME) and ultraperformance convergence chromatography tandem mass spectrometry (UPC(2)-MS/MS). Briefly, the particulate phase of the cigarette smoke was captured by a Cambridge filter pad, and diluted hydrogen chloride aqueous solution is employed to extract the aromatic amines under mechanical shaking...
May 27, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28581738/identification-and-quantitation-of-furocoumarins-in-popularly-consumed-foods-in-the-u-s-using-quechers-extraction-coupled-with-uplc-ms-ms-analysis
#9
Melissa M Melough, Sang Gil Lee, Eunyoung Cho, Kijoon Kim, Anthony A Provatas, Christopher Perkins, Min Kyung Park, Abrar Qureshi, Ock K Chun
Furocoumarins are a class of photoactive compounds found in several plant species and may be responsible for the observed association between consumption of citrus products and the risk of skin cancer. Furocoumarin contents of several foods have been reported previously, but no comprehensive database of furocoumarin content of foods is currently available. Therefore, this study aimed to determine the distribution of furocoumarins in popularly consumed foods in the U.S. Samples of three varieties of each of 29 foods known or suspected to contain furocoumarins were purchased, prepared for analysis using a solid phase extraction method, and analyzed using UPLC-MS/MS for the presence of seven major furocoumarins...
June 21, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28573566/determination-of-carbamazepine-and-12-degradation-products-in-various-compartments-of-an-outdoor-aquatic-mesocosm-by-reliable-analytical-methods-based-on-liquid-chromatography-tandem-mass-spectrometry
#10
Gaëlle Daniele, Maëva Fieu, Sandrine Joachim, Anne Bado-Nilles, Rémy Beaudouin, Patrick Baudoin, Alice James-Casas, Sandrine Andres, Marc Bonnard, Isabelle Bonnard, Alain Geffard, Emmanuelle Vulliet
The aims of this work are to develop suitable analytical methods to determine the widely used anticonvulsant carbamazepine and 12 of its degradation/transformation products in water, sediment, fish (Gasterosteus aculeatus) and mollusc (Dreissena polymorpha). Protocols based on solid phase extraction for water, pressurized-liquid extraction for sediments and QuEChERS (quick easy cheap efficient rugged and safe) extraction for both organisms followed by liquid chromatography-tandem mass spectrometry (LC-MS/MS) are developed, validated and finally applied to samples collected during a 6-month experiment in outdoor mesocosms...
June 2, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28560823/identification-and-quantification-of-predominant-metabolites-of-synthetic-cannabinoid-mab-chminaca-in-an-authentic-human-urine-specimen
#11
Koutaro Hasegawa, Kayoko Minakata, Kunio Gonmori, Hideki Nozawa, Itaru Yamagishi, Kanako Watanabe, Osamu Suzuki
An autopsy case in which the cause of death was judged as drug poisoning by two synthetic cannabinoids, including MAB-CHMINACA, was experienced. Although unchanged MAB-CHMINACA could be detected from solid tissues, blood and stomach contents in the case, the compound could not be detected from the urine specimen. In this article, we obtained six kinds of reference standards of MAB-CHMINACA metabolites from a commercial source. The MAB-CHMINACA metabolites from the urine specimen of the abuser were extracted by a QuEChERS method including dispersive solid-phase extraction, and analyzed by liquid chromatography-tandem mass spectrometry with or without hydrolysis with β-glucuronidase...
May 30, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28558907/cold-induced-aqueous-acetonitrile-phase-separation-a-salt-free-way-to-begin-quick-easy-cheap-effective-rugged-safe
#12
Gang Shao, Jeffrey Agar, Roger W Giese
Cooling a 1:1 (v/v) solution of acetonitrile and water at -16° C is known to result in two clear phases. We will refer to this event as "cold-induced aqueous acetonitrile phase separation (CIPS)". On a molar basis, acetonitrile is 71.7% and 13.6% in the upper and lower phases, respectively, in our study. The phase separation proceeds as a descending cloud of microdroplets. At the convenient temperature (typical freezer) employed here the lower phase is rather resistant to solidification, although it emerges from the freezer as a solid if various insoluble matter is present at the outset...
July 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28551239/development-and-validation-of-a-quechers-method-coupled-to-liquid-chromatography-and-high-resolution-mass-spectrometry-to-determine-pyrrolizidine-and-tropane-alkaloids-in-honey
#13
Marianna Martinello, Alice Borin, Roberto Stella, Davide Bovo, Giancarlo Biancotto, Albino Gallina, Franco Mutinelli
Awareness about pyrrolizidine alkaloids (PAs) and tropane alkaloids (TAs) in food was recently raised by the European Food Safety Authority stressing the lack of data and gaps of knowledge required to improve the risk assessment strategy. The present study aimed at the elaboration and validation of a method to determine PAs and TAs in honey. QuEChERS sample treatment and liquid chromatography coupled to hybrid high resolution mass spectrometry, were used. The method resulted in good linearity (R(2)>0.99) and low limits of detection and quantification, ranging from 0...
November 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28551144/multiresidue-method-for-identification-and-quantification-of-avermectins-benzimidazoles-and-nitroimidazoles-residues-in-bovine-muscle-tissue-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-uhplc-ms-ms-using-a-quechers-approach
#14
Guilherme Resende da Silva, Josefa Abucater Lima, Leonardo Francisco de Souza, Flávio Alves Santos, Mary Ane Gonçalves Lana, Débora Cristina Sampaio de Assis, Silvana de Vasconcelos Cançado
A quantitative and confirmatory multiresidue method for determining the presence of avermectins, benzimidazoles and nitroimidazoles in bovine muscle tissue by ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) was developed, optimized and validated, using a QuEChERS extraction. The evaluated performance parameters were linearity, selectivity, matrix effect, decision limits (CCα), detection capability (CCβ), limits of detection (LOD), limits of quantification (LOQ), accuracy, precision and robustness...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28514648/determination-of-fenobucarb-residues-in-animal-and-aquatic-food-products-using-liquid-chromatography-tandem-mass-spectrometry-coupled-with-a-quechers-extraction-method
#15
Weijia Zheng, Jin-A Park, Dan Zhang, A M Abd El-Aty, Seong-Kwan Kim, Sang-Hyun Cho, Jeong-Min Choi, Jae-Han Shim, Byung-Joon Chang, Jin-Suk Kim, Ho-Chul Shin
A modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction method coupled with liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI(+)/MS-MS) was developed for quantification of fenobucarb residues in animal food products, such as porcine muscle, egg, and whole milk, and aquatic food products, such as eel, flatfish, and shrimp. Acetonitrile with the addition of 0.1% trifluoroacetic acid was employed as an extraction solvent and was compared with acetonitrile alone and 0...
May 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28505493/development-of-an-analysis-method-for-determination-of-sulfonamides-and-their-five-acetylated-metabolites-in-baby-foods-by-ultra-high-performance-liquid-chromatography-coupled-to-high-resolution-mass-spectrometry-orbitrap-ms
#16
Ülgen I Konak, Muharrem Certel, Bülent Şık, Timur Tongur
A high sensitive and reliable multiresidue method was developed and validated for determination of twelve sulfonamides and five acetylated metabolites in baby foods by using UHPLC-Orbitrap-MS. The sample preparation included two extraction methods as QuEChERS and ASE. The original QuEChERS method was performed, whereas ASE method was optimized to achieve the best recovery for all analytes. UHPLC-Orbitrap-MS parameters were optimized to obtain good retention and separation in LC and high sensitivity and selectivity in MS...
July 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28505067/risk-assessment-of-florists-exposed-to-pesticide-residues-through-handling-of-flowers-and-preparing-bouquets
#17
Khaoula Toumi, Laure Joly, Christiane Vleminckx, Bruno Schiffers
Flowers are frequently treated with pesticides and, as a result, florists handling daily a large number of flowers can be exposed to pesticide residues. A study was conducted among twenty volunteer florists located in Namur Province and in the Brussels Capital Region of Belgium in order to assess their potential dermal exposure to dislodgeable pesticide residues transferred from flowers to hands. Two pairs of cotton gloves were worn during two consecutive half days while handling flowers and preparing bouquets (from min 2 h to max 3 h/day)...
May 13, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28501208/evaluation-of-a-quechers-like-extraction-approach-for-the-determination-of-pbdes-in-mussels-by-immuno-assay-based-screening-methods
#18
Sara Romanelli, Francesca Bettazzi, Tania Martellini, Weilin L Shelver, Alessandra Cincinelli, Roberta Galarini, Ilaria Palchetti
A sample preparation method was evaluated for the determination of polybrominated diphenyl ethers (PBDEs) in mussel samples, by using colorimetric and electrochemical immunoassay-based screening methods. Herein, a rapid procedure based on QuEChERS-like extraction approach followed by solid phase purification was optimized for PBDE extraction from mussel samples. The detection limits for colorimetric and electrochemical immunoassays, calculated as BDE-47 equivalent concentration, were 0.6ngg(-1) and 1.1ngg(-1), respectively...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28499340/tebuconazole-and-azoxystrobin-residue-behaviors-and-distribution-in-field-and-cooked-peanut
#19
Fan Hou, Peipei Teng, Fengmao Liu, Wenzhuo Wang
Residue behaviors of tebuconazole and azoxystrobin in field condition and the variation of their residue levels during the boiling process were evaluated. The terminal residues of peanut kernels were determined by using a modified QuEChERS method (quick, easy, cheap, effective, rugged, and safe) by means of the optimization of the novel purification procedure with multiwalled carbon nanotubes (MWCNTs) and Fe3O4-magnetic nanoparticle (Fe3O4-MNP) in the presence of an external magnetic field, and the terminal residues were all at trace level at harvest time...
June 7, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28490138/contamination-of-chinese-salted-fish-with-volatile-n-nitrosamines-as-determined-by-quechers-and-gas-chromatography-tandem-mass-spectrometry
#20
Yuesheng Qiu, Jie-Hua Chen, Weijun Yu, Pei Wang, Minxian Rong, Hong Deng
The QuEChERS sample preparation method and gas chromatography-tandem mass spectrometry were employed to determine nine volatile N-nitrosamines (VNAs) in Chinese salted fish. This method was validated by considering calibration plot linearity, selectivity, matrix effects, trueness, precision, limits of quantification and specificity. Fifty-four samples of Chinese salted fish obtained from five provinces were analyzed. The results indicated that the concentrations of one VNA, N-nitrosodimethylamine in 57.4% of the samples exceeded the acceptable limit (the China national standard value of 4μgkg(-1)), and total VNA contents in 68...
October 1, 2017: Food Chemistry
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