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perfluorinated compounds

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https://www.readbyqxmd.com/read/30084982/analysis-of-perfluorinated-compounds-in-environmental-water-using-decyl-perfluorinated-magnetic-mesoporous-microspheres-as-magnetic-solid-phase-extraction-materials-and-microwave-assisted-derivatization-followed-by-gas-chromatography-mass-spectrometry
#1
Qing Ye, Zongbao Chen
In this work, a new method was developed for perfluorinated compounds (PFCs) analysis in water samples based on decyl-perfluorinated magnetic mesoporous nanocomposites microspheres-assisted extraction and microwave-assisted derivatization followed by gas chromatography-mass spectrometry analysis. The decyl-perfluorinated magnetic mesoporous nanocomposites have several advantages such as fast separation ability, good dispersibility in water sample and high selective preconcentration of PFCs. Various parameters, including eluting solvent and volume, the amounts of absorbents, extraction time and elution time, the microwave-assisted derivatization conditions were optimized...
July 31, 2018: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/30078310/direct-cytosolic-microrna-detection-using-single-layer-perfluorinated-tungsten-diselenide-nanoplatform
#2
Yang Song, Xu Yan, Grayson Ostermeyer, Suiqiong Li, Ling-Bo Qu, Dan Du, Zhaohui Li, Yuehe Lin
Intracellular miRNA detection is vital important for diagnosing severe diseases like cancer and for resolving the ensemble of gene products that orchestrate the living state of cells. Recent advances in the design, synthesis and application of biocompatible nanomaterials as platforms for probing miRNAs have enabled widespread efforts to mobilize new compounds in biomedical research. 2D graphene-like nanomaterials exhibit desirable physical properties such as convenient quantum size and dynamic interface functionality...
August 6, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30053370/microsphere-fiber-interpenetrated-superhydrophobic-pvdf-microporous-membranes-with-improved-waterproof-and-breathable-performance
#3
Gaoshuo Jiang, Liqiang Luo, Lu Tan, Jinliang Wang, Shenxiang Zhang, Feng Zhang, Jian Jin
Superhydrophobic membranes with extreme liquid water repellency property are good candidates for waterproof and breathable application. Different from the mostly used strategies through either mixing or postmodifying base membranes with perfluorinated compounds, we report in this work a facile methodology to fabricate superhydrophobic microporous membranes made up of pure poly(vinylidene fluoride) (PVDF) via a high-humidity induced electrospinning process. The superhydrophobic property of the PVDF microporous membrane is contributed by its special microsphere-fiber interpenetrated rough structure...
August 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30052135/perfluorinated-compounds-in-food-simulants-after-migration-from-fluorocarbon-resin-coated-frying-pans-baking-utensils-and-non-stick-baking-papers-on-the-korean-market
#4
Heeju Choi, In-Ae Bae, Jae Chun Choi, Se-Jong Park, MeeKyung Kim
Perfluorinated compounds (PFCs) are used in manufacturing food contact materials, including non-stick cookware coatings and oil- and moisture-resistant paper coatings. The chemical stability of PFCs poses an issue for human safety, as they do not degrade well naturally and hence may accumulate in the body. In terms of food safety, since dietary intake is thought to be a major source of exposure to PFCs, it is necessary to assess the migration of PFCs from food packaging articles to food under typical cooking and storage conditions...
August 10, 2018: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/30043564/differential-expression-and-analysis-of-target-regulation-of-micrornas-in-alcohol-dependent-rats
#5
F Xin, X M Ye, H B Liu, L P Liu, L J Yan, J Hu
This study analyzed the differential expression of miRNAs related to alcohol dependence in rats undergoing continued consumption and withdrawal. Furthermore miRNAs were sought and evaluated for potential use as biomarkers for diagnosis. This study used Exiqon miRCURYTM LNA miRNA microarray on alcohol-dependent and normal rats for the expression of microRNAs in perfluorinated compounds, and the stem-loop qPCR method to validate its expression in brain tissue. We forecast the relevant target genes of differentially expressed miRNA and drew the regulatory network...
July 2018: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/30032612/novel-perfluorinated-triblock-amphiphilic-copolymers-for-lipid-shelled-microbubble-stabilization
#6
Yohann Corvis, Simona Manta, Caroline Thebault, Olivier Couture, Hélène Dhotel, Jean-Philippe Michel, Johanne Seguin, Michel Bessodes, Philippe Espeau, Chantal Pichon, Cyrille Richard, Nathalie Mignet
Amphiphilic triblock (Atri) copolymers made of perfluorinated alkyl chain linked to hydrocarbon chain and methoxy-poly(ethylene glycol) of three different molecular weights were synthesized. In vitro evaluation demonstrated that these new compounds were noncytotoxic. Characterization and interaction of each triblock copolymer with a branched polyamine myristoyl lipid (2-{3[bis-(3-amino-propyl)-amino]-propylamino}- N-ditetradecyl carbamoyl methyl-acetamide, DMAPAP) were studied by the Langmuir film method and thermal analysis...
August 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30031040/perfluorobutanesulfonic-acid-pfbs-potentiates-adipogenesis-of-3t3-l1-adipocytes
#7
Weipeng Qi, John M Clark, Alicia R Timme-Laragy, Yeonhwa Park
Perfluorobutanesulfonic acid (PFBS) is used as the replacement of perfluorooctanesulfonic acid (PFOS) since 2000 because of the concern on PFOS' persistence in the environment and the bioaccumulation in animals. Accumulating evidence has shown the correlation between the exposure to perfluorinated compounds and enhanced adipogenesis. There is no report, however, of the effect of PFBS on adipogenesis. Therefore, the present work aimed to investigate the role of PFBS in adipogenesis using 3T3-L1 adipocytes. PFBS treatment for 6 days extensively promoted the differentiation of 3T3-L1 preadipocytes to adipocytes, resulting in significantly increased triglyceride levels...
July 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/30027951/unexpected-reactivity-of-cyclic-perfluorinated-iodanes-with-electrophiles
#8
Stefan Gruber, Simon M Ametamey, Roger Schibli
We have found that cyclic perfluorinated iodanes react with electrophiles (E+ = Br, Cl, F, I) to afford perfluorinated E-RF compounds. This reactivity is unexpected since cyclic perfluorinated iodanes are considered as electrophilic reagents that normally react with nucleophiles (e.g. Nu- = SR, OR) to afford Nu-RF products. The utility of this new transformation is demonstrated for a [18F]CF3CF2-containing compound which was prepared from [18F]XeF2 obtained from cyclotron produced [18F]fluoride.
August 9, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/30020562/a-stable-crystalline-copper-i-n-2-o-complex-stabilized-as-the-salt-of-a-weakly-coordinating-anion
#9
Vadim Zhuravlev, Przemysław J Malinowski
Nitrous oxide is considered a poor ligand, and therefore only a handful of well-defined metal-N2 O complexes are known. Oxidation of copper powder with an extreme oxidant, [Ag2 I2 ][An]2 ([An]- =[Al(OC(CF3 )3 )4 ]- ) in perfluorinated hexane leads to CuI [An], the first auxiliary ligand-free CuI salt of the perfluorinated alkoxyaluminate anion. The compound is capable of forming a stable and crystalline complex with nitrous oxide, Cu(N2 O)[An], where the Cu-N2 O bond is by far the strongest among all other molecular metal-N2 O complexes known...
July 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29965761/interactions-of-long-chain-perfluorotelomer-alcohol-and-perfluorinated-hydrocarbons-with-model-decomposer-membranes
#10
Aneta Wójcik, Paulina Perczyk, Paweł Wydro, Michał Flasiński, Marcin Broniatowski
Perfluorinated hydrocarbons and their polar derivatives are produced annually in high quantities and find multiple industrial and technological applications due to their chemical and physical durability, significant hydro- and lipophobicity and excellent surface activity. Unfortunately, multiple perfluorinated compounds are recognized as persistent organic pollutants as they are completely nonbiodegradable and accumulate in soils and sediments. In our studies, we applied Langmuir monolayers formed by different structural phospholipids as models of soil bacteria and fungi membranes and investigated the effects exerted by long-chain perfluorinated pollutants, perfluorotelomer alcohol and two structurally different perfluorinated hydrocarbons, on the artificial membranes...
July 26, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29964925/-perfluorinated-compounds-in-snow-from-downtown-hangzhou-china
#11
Ming Zhang, Fang-Liang Tang, Ya-Yun Yu, Jian-Fen Xu, Jin-Han Chen, Bo Yu, Shan Zhou, Wei Zhang
Snow samples were collected from the snow event on January 20-22, 2016 from 11 sites in downtown Hangzhou to explore the occurrence of sixteen perfluorinated compounds (PFCs) in the atmosphere. All samples were prepared by solid-phase extraction with Oasis WAX cartridges and analyzed using ultra performance liquid chromatography interfaced with tandem mass spectrometry (UPLC-MS/MS). The results showed that seven medium- and short-chain PFCs including C4 and C8 perfluorinated sulfonates (PFSAs) and C4 -C6 , C8 , and C9 perfluorinated carboxylic acids (PFCAs) were detected in the snow samples...
August 8, 2017: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/29961652/enantioseparation-of-fluorinated-3-arylthio-4-4-bipyridines-insights-into-chalcogen-and-%C3%AF-hole-bonds-in-high-performance-liquid-chromatography
#12
Paola Peluso, Carlo Gatti, Alessandro Dessì, Roberto Dallocchio, Robin Weiss, Emmanuel Aubert, Patrick Pale, Sergio Cossu, Victor Mamane
A chalcogen bond (ChB) is a σ-hole-based noncovalent interaction between a Lewis base and an electrophilic element of Group VI (O, S, Se, Te), which behaves as a Lewis acid. Recently, we demonstrated that halogen bond, the more familiar σ-hole-based interaction, is able to promote the enantioseparation of chiral compounds in HPLC environment. On this basis, an investigation to detect ChBs, functioning as stereoselective secondary interactions for HPLC enantioseparations, was started off and the results of this study are described herein...
June 25, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29947903/dispersive-liquid-liquid-microextraction-as-a-new-clean-up-procedure-for-the-determination-of-parabens-perfluorinated-compounds-uv-filters-biocides-surfactants-and-plasticizers-in-root-vegetables
#13
Concepción Abril, Julia Martín, José Luis Malvar, Juan Luis Santos, Irene Aparicio, Esteban Alonso
An analytical method based on ultrasound-assisted extraction and dispersive liquid-liquid microextraction (DLLME) clean-up has been developed and validated for the determination of 31 emerging pollutants in root vegetables. The target compounds were four preservatives, six perfluoroalkyl compounds, six UV filters, two biocides, eight anionic surfactants, three nonionic surfactants, and two plasticizers. The type and volume of the extraction solvent, those of the disperser solvent, the pH and NaCl content of the DLLME aqueous phase, the amount of sample, and the sonication time were optimized...
August 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29913619/plant-uptake-and-translocation-of-contaminants-of-emerging-concern-in-soil
#14
REVIEW
Venkata L Reddy Pullagurala, Swati Rawat, Ishaq O Adisa, Jose A Hernandez-Viezcas, Jose R Peralta-Videa, Jorge L Gardea-Torresdey
The advent of industrialization has led to the discovery of a wide range of chemicals designed for multiple uses including plant protection. However, after use, most of the chemicals and their derivatives end up in soil and water, interacting with living organisms. Plants, which are primary producers, are intentionally or unintentionally exposed to several chemicals, serving as a vehicle for the transfer of products into the food chain. Although the exposure of pesticides towards plants has been witnessed over a long time in agricultural production, other chemicals have attracted attention very recently...
September 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29911897/per-and-polyfluoroalkyl-substances-impact-human-spermatogenesis-in-a-stem-cell-derived-model
#15
Alyse N Steves, Adam Turry, Brittany Gill, Danielle Clarkson-Townsend, Joshua M Bradner, Ian Bachli, W Michael Caudle, Gary W Miller, Anthony W S Chan, Charles A Easley
Per- and polyfluoroalkyl substances (PFASs) represent a highly ubiquitous group of synthetic chemicals used in products ranging from water and oil repellents and lubricants to firefighting foam. These substances can enter and accumulate in multiple tissue matrices in up to 100% of people assessed. Though animal models strongly identify these compounds as male reproductive toxicants, with exposed rodents experiencing declines in sperm count, alterations in hormones, and DNA damage in spermatids, among other adverse outcomes, human studies report conflicting conclusions as to the reproductive toxicity of these chemicals...
August 2018: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/29911865/electrochemosensor-for-trace-analysis-of-perfluorooctanesulfonate-in-water-based-on-a-molecularly-imprinted-poly-o-phenylenediamine-polymer
#16
Najmeh Karimian, Angela M Stortini, Ligia M Moretto, Claudio Costantino, Sara Bogialli, Paolo Ugo
This work is aimed at developing an electrochemical sensor for the sensitive and selective detection of trace levels of perfluorooctanesulfonate (PFOS) in water. Contamination of waters by perfluorinated alkyl substances (PFAS) is a problem of global concern due to their suspected toxicity and ability to bioaccumulate. PFOS is the perfluorinated compound of major concern, as it has the lowest suggested control concentrations. The sensor reported here is based on a gold electrode modified with a thin coating of a molecularly imprinted polymer (MIP), prepared by anodic electropolymerization of o-phenylenediamine (o-PD) in the presence of PFOS as the template...
July 27, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29874860/a-molecularly-imprinted-polymer-on-a-plasmonic-plastic-optical-fiber-to-detect-perfluorinated-compounds-in-water
#17
Nunzio Cennamo, Girolamo D'Agostino, Gianni Porto, Adriano Biasiolo, Chiara Perri, Francesco Arcadio, Luigi Zeni
A novel Molecularly Imprinted Polymer (MIP) able to bind perfluorinated compounds, combined with a surface plasmon resonance (SPR) optical fiber platform, is presented. The new MIP receptor has been deposited on a D-shaped plastic optical fiber (POF) covered with a photoresist buffer layer and a thin gold film. The experimental results have shown that the developed SPR-POF-MIP sensor makes it possible to selectively detect the above compounds. In this work, we present the results obtained with perfluorooctanoate (PFOA) compound, and they hold true when obtained with a perfluorinated alkylated substances (PFAs) mixture sample...
June 5, 2018: Sensors
https://www.readbyqxmd.com/read/29851409/study-of-hybrid-membrane-filtration-and-photocatalysis-for-removal-of-perfluorooctanoic-acid-pfoa-in-groundwater
#18
Apisara Boonya-Atichart, Suwanna Kitpati Boontanon, Narin Boontanon
Groundwater contamination in Thailand from leaking of leachate due to improper solid waste disposal can cause contamination by PFOA (one of the perfluorinated compounds). This study proposed a new idea for the removal of PFOA from groundwater using a combination of membrane filtration and photocatalysis. Spiked groundwater samples were treated by nanofiltration and the rejected part was sent to a UV contact tank for photocatalysis. All samples were analyzed by high-performance liquid chromatography-tandem mass spectrometer (HPLC-MS/MS)...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29851398/levels-of-perfluorinated-compounds-pfcs-in-groundwater-around-improper-municipal-and-industrial-waste-disposal-sites-in-thailand-and-health-risk-assessment
#19
Chanidaporn Hongkachok, Suwanna Kitpati Boontanon, Narin Boontanon, Shigeo Fujii, Shuhei Tanaka, Yuji Suzuki
The aims of this study were to examine the levels of perfluorinated compounds (PFCs) in groundwater around improperly developed municipal and industrial waste disposal sites, including estimating non-cancer risk and cancer risk from ingestion of the groundwater. A total of 27 groundwater samples were collected from two cities in Thailand, Ayutthaya and Chonburi. Seven target compounds were extracted by solid phase extraction (SPE) and analyzed by high-performance liquid chromatography-tandem mass spectrometer (HPLC-MS/MS)...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29778940/pcbs-and-organochlorine-pesticides-in-indoor-environments-a-comparison-of-indoor-contamination-in-canada-and-czech-republic
#20
Ondrej Audy, Lisa Melymuk, Marta Venier, Simon Vojta, Jitka Becanova, Kevin Romanak, Martina Vykoukalova, Roman Prokes, Petr Kukucka, Miriam L Diamond, Jana Klanova
Polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) are restricted compounds that are ubiquitously detected in the environment, including indoor matrices such as air and residential dust. We report concentrations of PCBs and selected OCPs in indoor air and dust from homes in Canada (23 homes) and Czech Republic (20 homes). Indoor air concentrations of PCBs and OCPs were ∼10 times higher than that outdoors. PCB concentrations of ∼450 ng/m3 were similar in both countries, higher in homes built before the restrictions on PCBs, and had congener profiles consistent with PCB mixtures manufactured or used in each country...
September 2018: Chemosphere
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