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https://www.readbyqxmd.com/read/29227544/a-fast-and-accurate-isotope-dilution-gc-it-ms-ms-method-for-determination-of-eugenol-in-different-tissues-of-fish-application-to-a-depletion-study-in-mandarin-fish
#1
Yongtao Liu, Xiaohui Ai, Le Li, Jincheng Li, Hong Yang
An accurate, rapid and effective method was established for determination of eugenol in plasma, muscle, skin, liver, kidney and gill of fish using gas chromatography-ion trap tandem mass spectrometry (GC-IT-MS/MS). Samples of muscle, skin, liver, kidney and gill were prepared using the modified QuEChERS (quick, easy, cheap, effective, rugged and safe) procedure, and plasma sample was prepared by a liquid-liquid extraction procedure. Eugenol was monitored in less than 7 min using an electron-ionization source (EI) in MS/MS mode and quantified by internal standard (IS) of eugenol-d3 ...
December 11, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29209966/residue-behavior-and-risk-assessment-of-imidacloprid-applied-on-greenhouse-cultivated-strawberries-under-different-application-conditions
#2
Tao Cang, Caixia Sun, Hua Zhao, Tao Tang, Changpeng Zhang, Ruixian Yu, Xinquan Wang, Qiang Wang, Fen Dai, Xueping Zhao
A risk assessment for imidacloprid applied on strawberries under different conditions was performed after residue determination using the quick, cheap, effective, rugged, and safe (QuEChERS) method. The application conditions were varied according to the applied dosage, addition of a plant oil or organosilicon surfactant, water volume, and sprayer type. The degradation dynamics of imidacloprid on strawberries followed first-order kinetics. At applied doses of 30-60 g a.i. ha-1, the half-lives of imidacloprid were 2...
December 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29203114/a-simultaneous-screening-and-quantitative-method-for-the-multiresidue-analysis-of-pesticides-in-spices-using-ultra-high-performance-liquid-chromatography-high-resolution-orbitrap-mass-spectrometry
#3
Arnab Goon, Zareen Khan, Dasharath Oulkar, Raviraj Shinde, Suresh Gaikwad, Kaushik Banerjee
A novel screening and quantitation method is reported for non-target multiresidue analysis of pesticides using ultra-HPLC-quadrupole-Orbitrap mass spectrometry in spice matrices, including black pepper, cardamom, chili, coriander, cumin, and turmeric. The method involved sequential full-scan (resolution = 70,000), and variable data independent acquisition (vDIA) with nine consecutive fragmentation events (resolution = 17,500). Samples were extracted by the QuEChERS method. The introduction of an SPE-based clean-up step through hydrophilic-lipophilic-balance (HLB) cartridges proved advantageous in minimizing the false negatives...
November 29, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29198836/facile-synthesis-of-amide-functional-reduced-graphene-oxides-as-modified-quick-easy-cheap-effective-rugged-and-safe-adsorbent-for-multi-pesticide-residues-analysis-of-tea
#4
Guicen Ma, Minglu Zhang, Li Zhu, Hongping Chen, Xin Liu, Chengyin Lu
Amide-functional reduced graphene oxide (amide-rGO) with different carbon chain length amino groups were successfully synthesized. The graphene oxides (GO) reduction as well as amino grafting were achieved simultaneously in one step via a facile solvothermal synthetic strategy. The obtained materials were characterized by X-ray diffraction, Raman spectroscopy, Fourier-transform infrared spectrometry and X-ray photoelectron spectroscopy to confirm the modification of GO with different amino groups. The adsorption performance of catechins and caffeine from tea acetonitrile extracts on different amide functional rGO samples were evaluated...
November 21, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29197758/uv-filters-and-musk-fragrances-in-seafood-commercialized-in-europe-union-occurrence-risk-and-exposure-assessment
#5
S C Cunha, L Trabalón, S Jacobs, M Castro, M Fernandez-Tejedor, K Granby, W Verbeke, C Kwadijk, F Ferrari, J Robbens, I Sioen, E Pocurull, A Marques, J O Fernandes, J L Domingo
In the framework of the FP7 ECsafeSeafood project, 62 seafood samples commercialized in Europe Union from several representative species - mackerel, tuna, salmon, seabream, cod, monkfish, crab, shrimp, octopus, perch and plaice - were analysed for residues of 21 personal care products (PCPs), including 11 UV-filters (UV-Fs) and 10 musk fragrances (musks). PCPs analysis were performed by Quick, Easy, Cheap, Effective Rugged, Safe (QuEChERS), combined with liquid-liquid extraction (LLE) or dispersive solid-phase extraction (dSPE), followed by gas chromatography-tandem mass spectrometry (GC-MS/MS)...
November 30, 2017: Environmental Research
https://www.readbyqxmd.com/read/29195223/dissipation-behaviour-residue-distribution-and-dietary-risk-assessment-of-tetraconazole-and-kresoxim-methyl-in-greenhouse-strawberry-via-rrlc-qqq-ms-ms-technique
#6
Xiaoxin Chen, Xueqi Fan, Yecheng Ma, Jiye Hu
20% commercial suspension emulsion (SE) of (8% tetraconazole + 12% kresoxim-methyl), as a pre-registered product in China, was firstly investigated under Chinese greenhouse-field conditions. A MWCNTs-based QuEChERS method for simultaneous determination of tetraconazole and kresoxim-methyl in strawberry was developed and validated via RRLC-QqQ-MS/MS. On basis of this method, the dissipation behaviours, residue distributions and dietary risk probability of these fungicides in strawberry were further investigated for food safety...
November 28, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29194519/development-of-an-analytical-procedure-for-the-determination-of-multiclass-compounds-for-forensic-veterinary-toxicology
#7
Bartosz Sell, Tomasz Sniegocki, Jan Zmudzki, Andrzej Posyniak
Reported here is a new analytical multiclass method based on QuEChERS technique, which has proven to be effective in diagnosing fatal poisoning cases in animals. This method has been developed for the determination of analytes in liver samples comprising rodenticides, carbamate and organophosphorus pesticides, coccidiostats and mycotoxins. The procedure entails addition of acetonitrile and sodium acetate to 2 g of homogenized liver sample. The mixture was shaken intensively and centrifuged for phase separation, which was followed by an organic phase transfer into a tube containing sorbents (PSA and C18) and magnesium sulfate, then it was centrifuged, the supernatant was filtered and analyzed by liquid chromatography tandem mass spectrometry...
November 29, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/29181027/dispersive-solid-phase-extraction-for-the-analysis-of-veterinary-drugs-applied-to-food-samples-a-review
#8
REVIEW
Gabriela Islas, Israel S Ibarra, Prisciliano Hernandez, Jose M Miranda, Alberto Cepeda
To achieve analytical success, it is necessary to develop thorough clean-up procedures to extract analytes from the matrix. Dispersive solid phase extraction (DSPE) has been used as a pretreatment technique for the analysis of several compounds. This technique is based on the dispersion of a solid sorbent in liquid samples in the extraction isolation and clean-up of different analytes from complex matrices. DSPE has found a wide range of applications in several fields, and it is considered to be a selective, robust, and versatile technique...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29174133/optimization-for-quechers-extraction-of-mycotoxins-and-veterinary-drugs-by-response-surface-methodology-for-application-to-egg-and-milk
#9
Jian Zhou, Jiao-Jiao Xu, Jin-Mi Cong, Zeng-Xuan Cai, Jing-Shun Zhang, Jun-Lin Wang, Yi-Ping Ren
A multiclass method was proposed for the simultaneous determination of various classes of veterinary drugs (n = 65), mycotoxins and metabolites (n = 39) in egg and milk by ultra-high performance liquid chromatography-tandem mass spectrometry. The contaminants were extracted by QuEChERS-based strategy including salt-out partitioning and dispersive solid-phase extraction for cleanup further. With the aim of maximizing throughput and extraction efficiency, Plackett-Burman design was employed initially for screening significant variables...
November 23, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29169203/dissipation-residues-and-risk-assessment-of-spirotetramat-and-its-four-metabolites-in-citrus-and-soil-under-field-conditions-by-lc-ms-ms
#10
Qingtao Zhang, Yuling Chen, Shouyi Wang, Yurong Yu, Ping Lu, Deyu Hu, Zaihui Yang
A modified Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) method for the simultaneous determination of spirotetramat and its four metabolite residues in citrus, peel, pulp and soil was developed and validated by liquid chromatography with tandem mass spectrometry (LC-MS/MS). The samples were extracted with acetonitrile (1%, glacial acetic acid, v/v) and purified using primary secondary amine and octadecylsilane. The limit of detection was 0.01-0.13 mg/kg, whereas that of quantification was 0.02-0...
November 23, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29166175/simultaneous-determination-of-isopyrazam-and-azoxystrobin-in-cucumbers-by-liquid-chromatography-tandem-mass-spectrometry
#11
Dan Hu, Xu Xu, Tian Cai, Wei-Ying Wang, Chun-Jie Wu, Li-Ming Ye
A rapid and sensitive analytical method based on high-performance liquid chromatography-tandem mass spectrometry was developed and validated for the determination of isopyrazam (IZM) and azoxystrobin (AZT) in cucumbers. A modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) method was used as the pretreatment procedure. The samples were extracted with acetonitrile and cleaned up with octadecylsilyl silica (C18) and graphite carbon black. The proposed method resulted in satisfactory recovery of IZM and AZT (91...
November 22, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29154120/optimization-of-multi-residue-method-for-targeted-screening-and-quantitation-of-243-pesticide-residues-in-cardamom-elettaria-cardamomum-by-gas-chromatography-tandem-mass-spectrometry-gc-ms-ms-analysis
#12
T P Ahammed Shabeer, Rushali Girame, Sagar Utture, Dasharath Oulkar, Kaushik Banerjee, D Ajay, Ranjith Arimboor, K R K Menon
Higher matrix interference makes the multi-residue pesticide analysis in spices more challenging. A simple, sensitive, and robust large-scale multi-residue method was developed for the rapid analysis of 243 pesticides in cardamom matrix by gas chromatography tandem mass spectrometry (GC-MS/MS). Prehydration of cardamom in 1:4 sample:water for 30 min improved the homogeneity and extractability. QuEChERS extraction followed by cleanup with 25 mg primary secondary amine, 100 mg C18, and 10 mg graphitized carbon black to 1 ml supernatant was used for sample preparation...
November 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29141711/application-of-gas-chromatography-coupled-to-quadrupole-orbitrap-mass-spectrometry-for-pesticide-residue-analysis-in-cereals-and-feed-ingredients
#13
Marc Tienstra, Hans G J Mol
A method for residue analysis of pesticides and polychlorinated biphenyls in cereals and feed ingredients based on QuEChERS extraction, programmed temperature vaporizer large-volume injection, and GC with electron ionization (EI) quadrupole Orbitrap full-scan high-resolution MS (60 000 full width at half-maximum at m/z 200) has been developed. In addition to full-scan acquisition, simultaneous full-scan and selected-ion monitoring acquisition was used to improve detectability in incidental cases in which analytes coeluted with intense signals from coextractants...
November 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29141708/sensitive-detection-of-neonicotinoid-insecticides-and-other-selected-pesticides-in-pollen-and-nectar-using-nanoflow-liquid-chromatography-orbitrap-tandem-mass-spectrometry
#14
David Moreno-González, Jaime Alcántara-Durán, Bienvenida Gilbert-López, Miriam Beneito-Cambra, Víctor M Cutillas, Łukasz Rajski, Antonio Molina-Díaz, Juan F García-Reyes
In this work, a new method based on nanoflow LC with high-resolution MS was developed for the determination ofeight pesticides in pollen and nectar samples, including neonicotinoid insecticides and other selected pesticides commonly found in bees and beeswax. Detection was undertaken with a hybrid quadrupole-Orbitrap mass spectrometer (Q Exactive™) equipped with a commercial nanospray ion source. The extraction of pesticides from pollen samples was performed by a modified micro-QuEChERS method scaled down to Eppendorf tubes, whereas nectar samples were simply diluted with a water–methanol (95 + 5, v/v) solution...
November 15, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29136927/enantioselective-determination-of-metconazole-in-multi-matrices-by-high-performance-liquid-chromatography
#15
Rujian He, Jun Fan, Qi Tan, Yecai Lai, Xiaodong Chen, Tai Wang, Ying Jiang, Yaomou Zhang, Weiguang Zhang
A reliable and effective HPLC analytical method has been developed to stereoselectively quantify metconazole in soil and flour matrices. Effects of polysaccharide chiral stationary phase, type and content of alcoholic modifier on separation of racemic metconazole have been discussed in detail. Resolution and quantitative determination of metconazole stereoisomers were performed by using an Enantiopak OD column, with the n-hexane-ethanol mixture (97:3, v/v) at the flow rate of 1.0mL/min. Then, extraction and cleanup procedures followed by the modified QuEChERS (quick, easy, cheap, effective, rugged and safe) method were used for metconazole racemate in soil and flour matrices...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136841/miniaturized-quechers-based-methodology-for-multiresidue-determination-of-pesticides-in-odonate-nymphs-as-ecosystem-biomonitors
#16
Florencia Jesús, Ricardo Hladki, Natalia Gérez, Natalia Besil, Silvina Niell, Grisel Fernández, Horacio Heinzen, María Verónica Cesio
The impacts of the modern, agrochemicals based agriculture that threatens the overall systems sustainability, need to be monitored and evaluated. Seeking for agroecosystems monitors, the present article focus in the occurrence and abundance of aquatic macroinvertebrates, that have been frequently used as bioindicators of water quality due to their relationship with land use. Some of these organisms are on the top of the food chain, where bioaccumulation and biomagnification processes can be observed, and they can turn into secondary pollution sources of systems and terrestrial organisms as well...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136552/development-and-validation-of-modified-quechers-method-coupled-with-lc-ms-ms-for-simultaneous-determination-of-cymiazole-fipronil-coumaphos-fluvalinate-amitraz-and-its-metabolite-in-various-types-of-honey-and-royal-jelly
#17
Weijia Zheng, Jin-A Park, A M Abd El-Aty, Seong-Kwan Kim, Sang-Hyun Cho, Jeong-Min Choi, Hee Yi, Soo-Min Cho, Amer Ramadan, Ji Hoon Jeong, Jae-Han Shim, Ho-Chul Shin
Over the past few decades, honey products have been polluted by different contaminants, such as pesticides, which are widely applied in agriculture. In this work, a modified EN - quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction method was developed for the simultaneous quantification of pesticide residues, including cymiazole, fipronil, coumaphos, fluvalinate, amitraz, and its metabolite 2,4-dimethylaniline (2,4-DMA), in four types of honey (acacia, wild, chestnut, and manuka) and royal jelly...
November 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29136366/use-of-an-efficient-measurement-uncertainty-approach-to-compare-room-temperature-and-cryogenic-sample-processing-in-the-analysis-of-chemical-contaminants-in-foods
#18
Lijun Han, Steven J Lehotay, Yelena Sapozhnikova
In this study, analytical results were compared when using different approaches to bulk food sample comminution, consisting of a vertical chopper (Blixer(®)) at room temperature and at dry ice cryogenic conditions, followed by further subsample processing (20 g) using liquid nitrogen cryogenic conditions (cryomill). Analysis of the 43 targeted spiked and incurred contaminants in a food mixture consisting of equal parts orange, apple, kale, salmon, and croaker involved QuEChERS with automated mini-column solid-phase extraction (known as ITSP) cleanup followed by low pressure gas chromatography - tandem mass spectrometry (LPGC-MS/MS)...
November 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29134768/determination-of-multiple-antibiotics-in-leafy-vegetables-using-quechers-uhplc-ms-ms
#19
Xiaolu Yu, Hang Liu, Chengjun Pu, Junhao Chen, Ying Sun, Lin Hu
A modified quick, easy, cheap, effective, rugged and safe method was established for simultaneous extraction and cleanup of multiple antibiotics in leafy vegetables, and ultra high performance liquid chromatography with tandem mass spectrometry was used for analysis. Antibiotics in leafy vegetables were extracted with citric acid/sodium citrate in mixed solvents consisting of acetonitrile/methanol (85:15 v/v) from 10 g of vegetables. Octadecylsilyl and graphitized carbon black were used as dispersant adsorbents...
November 14, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29132025/micro-quechers-extraction-coupled-to-gc-ms-for-a-fast-determination-of-bisphenol-a-in-human-urine
#20
Luísa Correia-Sá, Sónia Norberto, Cristina Delerue-Matos, Conceição Calhau, Valentina F Domingues
Bisphenol A (BPA) is considered an endocrine disruptor and public concern over BPA exposure has been raised. Several studies have assessed human exposure to this plasticizer, confirming its ubiquitous presence and highlighting children as a public of special concern. A simple, efficient, cheap and green analytical procedure is reported within this paper. This paper reports, for the first time, the development of a modified Micro-QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method coupled to gas chromatography-mass spectrometry (GC-MS) as a new strategy for the efficient extraction and determination of Bisphenol A in human urine samples...
November 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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