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https://www.readbyqxmd.com/read/29694937/migration-of-plasticizers-from-poly-vinyl-chloride-and-multilayer-infusion-bags-using-selective-extraction-and-gc-ms
#1
Zohra Haned, Saad Moulay, Silvia Lacorte
Flexible poly(vinyl chloride) (PVC) is widely used in the pharmaceutical industry for the manufacture of medical devices (tubes, probes, bags, primary packaging, etc.). The objective of the present study was to develop a procedure to evaluate the migration potential of nine plastic additives in aqueous infusion bags (NaCl 0.9% and glucose 5%): five phthalates, one adipate, two alkylphenols, and benzophenone. Two types of materials were analyzed: (i) new and outdated plasticized PVC (containing 40% of diethylhexyl phthalate DEHP); and (ii) tri-laminate polyethylene-polyamide-polypropylene, a multilayer material presumably exempt from DEHP...
April 12, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29694036/radical-carbofluorination-of-unactivated-alkenes-with-fluoride-ion
#2
Zhonglin Liu, He Chen, Ying Lv, Xinqiang Tan, Haigen Shen, Haizhu Yu, Chaozhong Li
The copper-assisted radical carbofluorination of unactivated alkenes with fluoride ion is described. With [Cu(L3)F2]H2O (L3 = 4,4'-di(methoxycarbonyl)-2,2'-bipyridine) as the fluorine source and [Ag(DMPhen)(MeCN)]BF4 (DMPhen = 2,9-dimethyl-1,10-phenanthroline) as the chloride scavenger, the reaction of unactivated alkenes with CCl4 in acetonitrile provided the corresponding carbofluorination products in satisfactory yields. The protocol exhibited a wide functional group compatibility and broad substrate scope, and could be extended to the use of a variety of activated alkyl chlorides other than CCl4...
April 25, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29694027/an-ims-fragmenter-ims-analog-of-a-triple-quadrupole-for-high-resolution-ion-analysis-at-atmospheric-pressure
#3
Mario Amo-Gonzalez, Irene Carnicero, Sergio Pérez, Rafael Delgado, Gary A Eiceman, Gonzalo Fernandez De La Mora, Juan Fernandez de la Mora
Two differential mobility analyzers (DMAs) acting as narrow band mobility filters are coupled in series, with a thermal fragmentation cell placed in between, such that parent ions selected in DMA1 are fragmented in the cell at atmospheric pressure, and their product ions are analyzed on DMA2. Additional mass spectrometer analysis is performed for ion identification purposes. A key feature of the tandem DMA is the short residence time (~0.2 ms) of ions in the analyzer, compared to tens of ms in drift tube IMS...
April 25, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29693783/electron-catalyzed-cross-coupling-reaction-of-arylboron-compounds-with-aryl-iodides
#4
Keisho Okura, Tsuyoshi Teranishi, Yuto Yoshida, Eiji Shirakawa
Arylboroxines in combination with zinc chloride and potassium tert-butoxide were found to undergo the electron-catalyzed cross-coupling reaction with aryl iodides to give the corresponding biaryls with no aid of transition metal catalysis.
April 25, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29693627/effect-of-silver-nitrate-and-sodium-fluoride-with-tri-calcium-phosphate-on-streptococcus-mutans-and-demineralised-dentine
#5
Ollie Yiru Yu, Irene Shuping Zhao, May Lei Mei, Edward Chin-Man Lo, Chun-Hung Chu
This study investigated the effect of 25% silver nitrate (AgNO₃) and 5% sodium fluoride (NaF) varnish with functionalized tri-calcium phosphate (fTCP) on a Streptococcus mutans ( S. mutans ) biofilm and dentine caries lesion. Demineralised dentine specimens were treated with 25% AgNO₃ and 5% NaF + fTCP (Group 1), 25% AgNO₃ and 5% NaF (Group 2), 25% AgNO₃ (Group 3), or water (Group 4). The specimens were subjected to a S. mutans biofilm challenge after treatment. The biofilm was then studied via scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), and colony forming units (CFU)...
April 25, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29693499/adsorption-of-mercury-by-activated-carbon-prepared-from-dried-sewage-sludge-in-simulated-flue-gas
#6
Jeongmin Park, Sang-Sup Lee
Conversion of sewage sludge to activated carbon is attractive as an alternative method to ocean dumping for the disposal of sewage sludge. Injection of activated carbon upstream of particulate matter control devices has been suggested as a method to remove elemental mercury from flue gas. Activated carbon was prepared using various activation temperatures and times and was tested for their mercury adsorption efficiency using lab-scale systems. To understand the effect of the physical property of the activated carbon, its mercury adsorption efficiency was investigated as a function of their Brunauer-Emmett-Teller (BET) surface area...
April 25, 2018: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/29693418/vasorelaxant-effect-of-quercetin-on-cerebral-basilar-artery-in-vitro-and-the-underlying-mechanisms-study
#7
Tian-Yi Yuan, Zi-Ran Niu, Di Chen, Yu-Cai Chen, Hui-Fang Zhang, Lian-Hua Fang, Guan-Hua Du
The aim of this study is to investigate the vasorelaxant effect of quercetin on cerebral basilar artery in vitro and provide a preliminary discussion concerning the underlying mechanisms. Using a DMT-isolated micro vessel system, quercetin was found to exhibit a vasodilatory effect on basilar arteries contracted by potassium chloride (KCl), endothelin-1 (ET-1), and 5-hydroxytryptamine (5-HT). The vasorelaxant effect of quercetin was partially attenuated when endothelium cells were removed. L-NAME, indomethacin, and ODQ treatment also decreased the potency of quercetin...
April 25, 2018: Journal of Asian Natural Products Research
https://www.readbyqxmd.com/read/29693384/ligand-control-of-supramolecular-chloride-photorelease
#8
Michael D Turlington, Ludovic Troian-Gautier, Renato N Sampaio, Evan E Beauvilliers, Gerald J Meyer
Supramolecular assembly is shown to provide control over excited-state chloride release. Two dicationic chromophores were designed with a ligand that recognizes halide ions in CH2 Cl2 and a luminescent excited state whose dipole was directed toward, 12+ , or away, 22+ , from an associated chloride ion. The dipole orientation had little influence on the ground-state equilibrium constant, Keq ∼ 4 × 106 M-1 , but induced a profound change in the excited-state equilibrium. Light excitation of [12+ ,Cl- ]+ resulted in time-dependent shifts in the photoluminescence spectra with the appearance of biexponential kinetics consistent with the photorelease of Cl- ...
April 25, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29693146/high-glucose-promotes-tumor-cell-proliferation-and-migration-in-lung-adenocarcinoma-via-the-rage%C3%A2-noxs-pathway
#9
Yuan-Fan Liao, Sui Yin, Zi-Qi Chen, Fan Li, Bo Zhao
Over the past few decades, it has been demonstrated that hyperglycemia can promote lung carcinoma growth, potentially through significantly increased glucose metabolism; however, the underlying mechanism remains to be fully elucidated. In the present study, treatment with a high concentration of glucose (HG) significantly promoted the proliferation and migration of A549 cells. Receptor for advanced glycation end‑products (RAGE) has previously been demonstrated to be associated with diabetes mellitus and oxidative stress, and nicotinamide adenine dinucleotide phosphate oxidases (NOXs) are considered to be initiating factors of oxidative stress...
April 23, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29692924/influence-of-technique-used-to-attach-the-infusion-set-to-peristaltic-finger-smart-pumps-on-dispensing-time-an-experimental-study
#10
Masayuki Umemura, Kanae Maegawa, Daichi Arai, Katsuro Shigeno, Yoshifumi Wakiya
Background: Infusion sets designed for peristaltic finger smart pumps (PFSPs) are necessary for the pumps' accurate handling. We previously found that medication dispensing is occasionally incomplete following the calculated infusion time when using certain combinations of PFSPs and infusion sets at a Japanese hospital. Thus, in this study, we investigated the cause of this observed delay by determining the effect of infusion set attachment technique on dispensing time using a combination of three kinds of PFSPs and five kinds of polyvinyl chloride (PVC) and polybutadiene (PB) infusion sets...
2018: Journal of Pharmaceutical Health Care and Sciences
https://www.readbyqxmd.com/read/29692599/structure-and-microanalysis-of-tear-film-ferning-of-camel-tears-human-tears-and-refresh-plus
#11
Masmali Am, Fagehi Ra, Ahmad H El-Naggar, Almubrad Tm
Purpose: This study aimed to investigate the tear ferning pattern and chemical elements of the tear film of camel tears compared with human tears and Refresh Plus eye lubricant. Refresh Plus was used as a control because it provides a healthy ferning pattern, due to the presence of an optimum ratio of carboxymethylcellulose (CMC) sodium and electrolytes. The main research focus is elucidating the viability of camel tear film in the dry, harsh environment of the desert. Methods: The tears were collected from five camels, five male desert workers (20-25 years old) at a small village located 100 km from Riyadh, Saudi Arabia, and five male subjects (20-25 years old) from Riyadh...
2018: Molecular Vision
https://www.readbyqxmd.com/read/29691575/-protective-effects-of-endogenous-carbon-monoxide-against-myocardial-ischemia-reperfusion-injury-in-rats
#12
Zhen Zhou, Shuang Ma, Jie Liu, Qiao-Rong Ji, Cheng-Zhu Cao, Xiao-Na Li, Feng Tang, Wei Zhang
The present study is aimed to explore the effects of endogenous carbon monoxide on the ischemia-reperfusion in rats. Wistar rats were intraperitoneally injected with protoporphyrin cobalt chloride (CoPP, an endogenous carbon monoxide agonist, 5 mg/kg), zinc protoporphyrin (ZnPP, an endogenous carbon monoxide inhibitor, 5 mg/kg) or saline. Twenty-four hours after injection, the myocardial ischemia-reperfusion model was made by Langendorff isolated cardiac perfusion system, and cardiac function parameters were collected...
April 25, 2018: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/29691375/thc-exposure-of-human-ipsc-neurons-impacts-genes-associated-with-neuropsychiatric-disorders
#13
Boris Guennewig, Maina Bitar, Ifeanyi Obiorah, James Hanks, Elizabeth A O'Brien, Dominik C Kaczorowski, Yasmin L Hurd, Panos Roussos, Kristen J Brennand, Guy Barry
There is a strong association between cannabis use and schizophrenia but the underlying cellular links are poorly understood. Neurons derived from human-induced pluripotent stem cells (hiPSCs) offer a platform for investigating both baseline and dynamic changes in human neural cells. Here, we exposed neurons derived from hiPSCs to Δ9 -tetrahydrocannabinol (THC), and identified diagnosis-specific differences not detectable in vehicle-controls. RNA transcriptomic analyses revealed that THC administration, either by acute or chronic exposure, dampened the neuronal transcriptional response following potassium chloride (KCl)-induced neuronal depolarization...
April 25, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29691268/stability-of-milrinone-in-continuous-ambulatory-delivery-devices
#14
Farah Al Madfai, Syed Tabish R Zaidi, Long Chiau Ming, Troy Wanandy, Rahul P Patel
PURPOSE: The stability of milrinone in continuous ambulatory delivery devices (CADDs) stored at 4, 25, and 35 °C was evaluated. METHOD: Six CADDs (3 devices containing milrinone plus 0.9% sodium chloride injection and 3 devices containing milrinone plus 5% dextrose injection) were prepared. Devices were kept at 4 °C for 168 hours, followed by 24 hours at 25 °C and an additional 24 hours at 35 °C. Samples ( n = 3) were withdrawn aseptically at 0, 24, 48, 72, 96, 120, 144, and 168 hours from the CADDs stored at 4 °C and at 0, 6, and 24 hours from the CADDs stored at 25 and 35 °C...
May 1, 2018: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/29691035/copper-mediated-homogeneous-living-radical-polymerization-of-acrylamide-with-waxy-potato-starch-based-macroinitiator
#15
Yifei Fan, Huatang Cao, Frank van Mastrigt, Yutao Pei, Francesco Picchioni
Cu0 -mediated living radical polymerization (Cu0 -mediated LRP) was employed in this research for the synthesis of starch-g-polyacrylamide (St-g-PAM). The use of a controlled radical grafting technique is necessary, as compared to the traditional free-radical polymerization methods, in order to obtain a well-defined structure of the final product. This is in turn essential for studying the relationship between such structure and the end-properties. Waxy potato starch-based water-soluble macroinitiator was first synthesized by esterification with 2-bromopropionyl bromide in the mixture of dimethylacetamide and lithium chloride...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29690582/convenient-synthesis-of-thiohydantoins-imidazole-2-thiones-and-imidazo-2-1-b-thiazol-4-iums-from-polymer-supported-%C3%AE-acylamino-ketones
#16
Petra Králová, Michal Maloň, Hiroyuki Koshino, Miroslav Soural
The preparation of 5-methylene-thiohydantoins using solid-phase synthesis is reported in this paper. After sulfonylation of immobilized Ser ( t -Bu)-OH with 4-nitrobenzenesulfonyl chloride followed by alkylation with various bromoketones, the 4-Nos group was removed and the resulting polymer-supported α-acylamino ketones reacted with Fmoc-isothiocyanate. Cleavage of the Fmoc protecting group was followed by the spontaneous cyclative cleavage releasing the 5-methylene-thiohydantoin derivatives from the polymer support...
April 23, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29690516/evaluation-of-manganese-chloride-s-effect-on-biosynthetic-properties-of-in-vitro-cultures-of-eschscholzia-californica-cham
#17
Andrea Balažová, Júlia Urdová, František Bilka, Ivana Holková, Branislav Horváth, Vladimír Forman, Pavel Mučaji
The basal production of secondary metabolites in medicinal plants is limited. One of the effective approaches that encourages plants to produce a remarkable amount of precious compounds is an application of elicitors. Our work was focused on the elicitation of Eschscholzia californica Cham. suspension cultures using various concentrations of MnCl₂ (5; 10; 15 mg/L) with the aim of evaluating its effect on sanguinarine, chelerythrine, and macarpine production and gene expression of enzymes involved in the biosynthesis of mentioned secondary metabolites (BBE, 4′-OMT, CYP80B1) or in defense processes (LOX)...
April 21, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29689533/multiple-response-optimization-for-high-efficiency-energy-saving-treatment-of-rhodamine-b-wastewater-in-a-three-dimensional-electrochemical-reactor
#18
Jing Ji, Yang Liu, Xue-Yuan Yang, Juan Xu, Xiu-Yan Li
The removal of high-concentration rhodamine B (RhB) wastewater was investigated in a three-dimensional electrochemical reactor (3DER) packed with granular activated carbon (GAC) particle electrodes. Response surface methodology (RSM) coupled with grey relational analysis (GRA) was used to evaluate the effects of voltage, initial pH, aeration rate and NaCl dosage on RhB removal and energy consumption of the 3DER. The optimal conditions were determined as voltage 7.25 V, pH 5.99, aeration rate 151.13 mL/min, and NaCl concentration 0...
April 21, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29688786/comparison-of-the-efficacy-of-various-concentrations-and-combinations-of-serum-ethylenediaminetetraacetic-acid-tetracycline-doxycycline-minocycline-and-n-acetylcysteine-for-inhibition-of-collagenase-activity-in-an-in-vitro-corneal-degradation-model
#19
Beth A Kimmitt, George E Moore, Jean Stiles
OBJECTIVE To compare the efficacy of various concentrations and combinations of serum, EDTA, 3 tetracyclines, and N-acetylcysteine (NAC) for collagenase inhibition in an in vitro corneal degradation model. SAMPLE Grossly normal corneas from recently euthanized dogs and horses and fresh serum from healthy dogs and horses. PROCEDURES Serum was pooled by species for in vitro use. For each species, sections of cornea were dried, weighed, and incubated with clostridial collagenase (800 U/mL) in 5 mL of a 5mM calcium chloride-saline (0...
May 2018: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/29688706/supramolecular-organization-of-tecl-6-2-with-ionic-liquid-cations-studies-on-the-electrical-conductivity-and-luminescent-properties
#20
Nan-Nan Shen, Min-Lan Cai, Ying Song, Ze-Ping Wang, Fu-Quan Huang, Jian-Rong Li, Xiao-Ying Huang
A series of hybrid tellurium chlorides based on ionic liquids (ILs), namely, α-[Bmim]2 TeCl6 (1, Bmim = 1-butyl-3-methyl imidazolium), β-[Bmim]2 TeCl6 (2), [HOOCMim]2 TeCl6 (3, HOOCMim = 1-carboxymethyl-3-methyl imidazolium), [Bzmim]2 TeCl6 (4, Bzmim = 1-benzyl-3-methyl imidazolium), [EPy]2 TeCl6 (5, EPy = 1-ethylpyridinium), [Bmmim]2 TeCl6 (6, Bmmim = 1-butyl-2,3-dimethyl imidazolium), have been synthesized and characterized. Different kinds of supramolecular networks have been obtained via self-assemblies of isolated [TeCl6 ]2- anions and various ionic liquid cations...
April 24, 2018: Inorganic Chemistry
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