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Anion exchange resin

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https://www.readbyqxmd.com/read/28806598/automated-synthesis-of-1-11-c-acetoacetate-on-a-trasis-aio-module
#1
Kiran Kumar Solingapuram Sai, H Donald Gage, Frankis Almaguel, Bryan Neth, Timothy M Hughes, Sebastien Tremblay, Christian-Alexandre Castellano, Stephen C Cunnane, Matthew J Jorgensen, Suzanne Craft, Akiva Mintz
We automated radiochemical synthesis of 1-[(11)C]acetoacetate in a commercially available radiochemistry module, TRASIS AllInOne by [(11)C]carboxylation of the corresponding enolate anion generated in situ from isopropenylacetate and MeLi, and purified by ion-exchange column resins.1-[(11)C]acetoacetate was synthesized with high radiochemical purity (95%) and specific activity (~ 66.6GBq/µmol, n = 30) with 35% radiochemical yield, decay corrected to end of synthesis. The total synthesis required ~ 16min. PET imaging studies were conducted with 1-[(11)C]acetoacetate in vervet monkeys to validate the radiochemical synthesis...
August 2, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28764325/anion-exchange-fibers-for-improved-sample-loading-in-ultra-trace-analysis-of-plutonium-by-thermal-ionization-mass-spectrometry
#2
Joseph M Mannion, Charles R Shick, Glenn A Fugate, Brian A Powell, Scott M Husson
A new sample loading procedure was developed for isotope ratio measurements of ultratrace amounts of plutonium with thermal ionization mass spectrometry (TIMS). The goal was to determine the efficacy of a polymer fiber architecture for TIMS sample loading by following similar sample loading procedures as those used in bead loading. Fibers with diameter of approximately 100 μm were prepared from triethylamine-quaternized-poly(vinylbenzyl chloride) cross-linked with diazabicyclo[2.2.2]octane. Fiber sections (2...
August 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28734959/removal-of-both-n-nitrosodimethylamine-and-trihalomethanes-precursors-in-a-single-treatment-using-ion-exchange-resins
#3
Wilson Beita-Sandí, Tanju Karanfil
Drinking water utilities are relying more than ever on water sources impacted by wastewater effluents. Disinfection/oxidation of these waters during water treatment may lead to the formation of several disinfection by-products, including the probable human carcinogen N-nitrosodimethylamine (NDMA) and the regulated trihalomethanes (THMs). In this study, the potential of ion exchange resins to control both NDMA and THMs precursors in a single treatment is presented. Two ion exchange resins were examined, a cation exchange resin (Plus) to target NDMA precursors and an anion exchange resin (MIEX) for THMs precursors control...
July 14, 2017: Water Research
https://www.readbyqxmd.com/read/28719875/novel-magnetic-carboxyl-modified-hypercrosslinked-resins-for-effective-removal-of-typical-ppcps
#4
Jing Jin, Tianyu Feng, Yan Ma, Wei Wang, Yunshu Wang, Qing Zhou, Aimin Li
A series of novel magnetic carboxyl modified hypercrosslinked resins were successfully prepared via a sequence of suspension polymerization, hydrolysis and post-crosslinking reactions. The serial resins possessed both high cation exchange capacity and high specific surface area with MA-10 having the supreme specific surface area of 1238.65 m(2)/g and MA-70 having the largest exchange capacity of 6.45 mmol/g. The serial resins exhibited excellent adsorption capacity of typical PPCPs including chloramphenicol, atenolol, ibuprofen and tetracycline, which were neutral, cationic, anionic and zwitterionic respectively in natural water...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28696165/quantifying-the-performance-of-a-hybrid-anion-exchanger-adsorbent-for-phosphorus-removal-using-mass-spectrometry-coupled-with-batch-kinetic-trials
#5
Benjamin D Martin, Lueta De Kock, Maxime Gallot, Elodie Guery, Sylvain Stanowski, Jitka MacAdam, Ewan J McAdam, Simon A Parsons, Bruce Jefferson
Increasingly stricter phosphorus discharge limits represent a significant challenge for the wastewater industry. Hybrid media comprising anionic exchange resins with dispersions of hydrated ferric oxide nanoparticles have been shown to selectively remove phosphorus from wastewaters, and display greater capacity and operational capability than both conventional treatment techniques and other ferric-based adsorbent materials. Spectrographic analyses of the internal surfaces of a hybrid media during kinetic experiments show that the adsorption of phosphorus is very rapid, utilising 54% of the total capacity of the media within the first 15 min and 95% within the first 60 min...
July 20, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28685504/statins-for-children-with-familial-hypercholesterolemia
#6
REVIEW
Alpo Vuorio, Jaana Kuoppala, Petri T Kovanen, Steve E Humphries, Serena Tonstad, Albert Wiegman, Euridiki Drogari, Uma Ramaswami
BACKGROUND: Familial hypercholesterolemia is one of the most common inherited metabolic diseases and is an autosomal dominant disorder meaning heterozygotes, or carriers, are affected. Those who are homozygous have severe disease. The average worldwide prevalence of heterozygous familial hypercholesterolemia is at least 1 in 500, although recent genetic epidemiological data from Denmark and next generation sequencing data suggest the frequency may be closer to 1 in 250. Diagnosis of familial hypercholesterolemia in children is based on elevated total cholesterol and low-density lipoprotein cholesterol levels or DNA-based analysis, or both...
July 7, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#7
Xiaoyang Shi, Qibin Li, Tao Wang, Klaus S Lackner
This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance of desorption process and the diffusivity of water molecules in the CO2 absorbent. It has been proved that the kinetic performance of CO2 absorption/desorption can be improved by using thin binder and hot water treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28619052/heterologous-expression-of-an-%C3%AE-amylase-inhibitor-from-common-bean-phaseolus-vulgaris-in-kluyveromyces-lactis-and-saccharomyces-cerevisiae
#8
Stephanie Brain-Isasi, Alejandro Álvarez-Lueje, Thomas Joseph V Higgins
BACKGROUND: Phaseolamin or α-amylase inhibitor 1 (αAI) is a glycoprotein from common beans (Phaseolus vulgaris L.) that inhibits some insect and mammalian α-amylases. Several clinical studies support the beneficial use of bean αAI for control of diabetes and obesity. Commercial extracts of P. vulgaris are available but their efficacy is still under question, mainly because some of these extracts contain antinutritional impurities naturally present in bean seeds and also exhibit a lower specific activity αAI...
June 15, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28618381/magnetic-recyclable-bismuth-oxyiodide-polyacrylic-anion-exchange-resin-composites-with-enhanced-photocatalytic-activity-under-visible-light
#9
Jingjing Zheng, Zhengbo Jiao
A series of magnetic recyclable bismuth oxyiodide (BiOI)/polyacrylic anion exchange resin (PAER) composites with visible light responses have been synthesized for the first time through a facile and low-cost method at normal temperature. The photocatalytic performances of BiOI/PAER composites were evaluated by photodegrading 1-amino-8-naphthol-3,6-disulfonic acid under visible light. It was found that 1-amino-8-naphthol-3,6-disulfonic acid (H-acid) removal rate reached to 90.1% (BiOI/PAER-2), which was higher than the pure BiOI (50...
May 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28600665/determination-of-degradation-kinetics-and-effect-of-anion-exchange-resin-on-dissolution-of-novel-anticancer-drug-rigosertib-in-acidic-conditions
#10
Hardikkumar H Patel, Manoj Maniar, Chen Ren, Rutesh H Dave
Rigosertib is a novel anticancer drug in clinical development by Onconova therapeutics, Inc. Currently, it is in pivotal phase III clinical trials for myelodysplastic syndrome (MDS) patients. Chemically, it is a sodium salt of weak acid with low solubility in lower pH solutions. In the preliminary studies, it was found that rigosertib is unstable in acidic conditions and forms multiple degradation products. In this research, drug degradation kinetics of rigosertib were studied in acidic conditions. Rigosertib follows pseudo-first-order general acid catalysis reaction...
June 9, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28599363/ranking-traditional-and-nano-enabled-sorbents-for-simultaneous-removal-of-arsenic-and-chromium-from-simulated-groundwater
#11
Mac Gifford, Kiril Hristovski, Paul Westerhoff
Water from many municipal and private wells are treated to meet arsenic (As(V)) regulations, and new regulations for hexavalent chromium (Cr(VI)) are soon possible. Rather than adding costly capital infrastructure, we explored many types of sorbents' ability to remove both oxygenated anions simultaneously. In laboratory pseudo-equilibrium tests, metal (hydr)oxide sorbents demonstrated high affinity for As(V) but exhibited 30 to 100-fold lower capacities to remove Cr(VI). WBAX resins had some ability to sorb both Cr(VI) and As(V), but competing anions lowered their sorption capacity for As(V) by >90% compared to in a deionized water matrix...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28599261/secretory-immunoglobulin-purification-from-whey-by-chromatographic-techniques
#12
Alexander Matlschweiger, Hannah Engelmaier, Gottfried Himmler, Rainer Hahn
Secretory immunoglobulins (SIg) are a major fraction of the mucosal immune system and represent potential drug candidates. So far, platform technologies for their purification do not exist. SIg from animal whey was used as a model to develop a simple, efficient and potentially generic chromatographic purification process. Several chromatographic stationary phases were tested. A combination of two anion-exchange steps resulted in the highest purity. The key step was the use of a small-porous anion exchanger operated in flow-through mode...
May 26, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28528413/dissolved-platinum-concentrations-in-coastal-seawater-boso-to-sanriku-areas-japan
#13
Asami Suzuki Mashio, Hajime Obata, Toshitaka Gamo
Platinum, one of the rarest elements in the earth's crust, is now widely used in a range of products, such as catalytic converters in automobiles and anticancer drugs. Increasing use and dispersal of platinum has the potential to affect aquatic environments. Platinum concentrations in open ocean seawater have been found to be very low (approximately 0.2 pmol/L); however, Pt distributions and biogeochemical cycles in coastal areas are unknown. In this study, we investigated Pt concentrations in coastal waters between the Boso and Sanriku areas, Japan, after the 2011 tsunami...
August 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28505573/effect-of-inorganic-regenerant-properties-on-pharmaceutical-adsorption-and-desorption-performance-on-polymer-anion-exchange-resin
#14
Shaokui Zheng, Xiaofeng Li, Xueyu Zhang, Wei Wang, Shengliu Yuan
This study investigated the potential effect of four frequently used inorganic regenerant properties (i.e., ionic strength, cation type, anion type, and regeneration solution volume) on the desorption and adsorption performance of 14 pharmaceuticals, belonging to 12 therapeutic classes with different predominant chemical forms and hydrophobicities, using polymeric anion exchange resin (AER)-packed fixed-bed column tests. After preconditioning with NaCl, NaOH, or saline-alkaline (SA) solutions, all resulting mobile counterion types of AERs effectively adsorbed all 14 pharmaceuticals, where the preferential magnitude of OH(-)-type = Cl(-) + OH(-)-type > Cl(-)-type...
May 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/28494246/catalytic-hydrodechlorination-of-triclosan-using-a-new-class-of-anion-exchange-resin-supported-palladium-catalysts
#15
Bing Han, Wen Liu, Jingwen Li, Jin Wang, Dongye Zhao, Rui Xu, Zhang Lin
We prepared a new class of anion-exchange-resin supported Pd catalysts for efficient hydrodechlorination of triclosan in water. The catalysts were prepared through an initial ion-exchange uptake of PdCl4(2-) and subsequent reduction of Pd(II) to Pd(0) nanoparticles at ambient temperature. Two standard strong-base anion exchange resins (IRA-900 and IRA-958) with different matrices (polystyrene and polyacrylic) were chosen as the supports. SEM and TEM images showed that Pd(0) nanoparticles were evenly attached on the resin surface with a mean size of 3-5 nm...
April 26, 2017: Water Research
https://www.readbyqxmd.com/read/28488858/development-of-a-high-throughput-ion-exchange-resin-characterization-workflow
#16
Chun Liu, Daniel Dermody, Keith Harris, Thomas Boomgaard, Jeff Sweeney, Daryl Gisch, Bob Goltz
A novel high-throughout (HTR) ion-exchange (IEX) resin workflow has been developed for characterizing ion exchange equilibrium of commercial and experimental IEX resins against a range of different applications where water environment differs from site to site. Because of its much higher throughput, design of experiment (DOE) methodology can be easily applied for studying the effects of multiple factors on resin performance. Two case studies will be presented to illustrate the efficacy of the combined HTR workflow and DOE method...
May 18, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28470063/green-synthesis-of-conjugated-linoleic-acids-from-plant-oils-using-a-novel-synergistic-catalytic-system
#17
Yu Zhang, Huaxiang Gu, Hao Shi, Fei Wang, Xun Li
A novel and efficient method has been developed for converting plant oil into a specific conjugated linoleic acid (CLA) using a synergistic biocatalytic system based on immobilized Propionibacterium acnes isomerase (PAI) and Rhizopus oryzae lipase (ROL). PAI exhibited the greatest catalytic activity when immobilized on D301R anion-exchange resin under optimal conditions (PAI dosage of 12 410 U of PAI/g of D301R, glutaraldehyde concentration of 0.4%, and reaction conditions of pH 7.0, 25 °C, and 60 min). Up to 109 g/L trans-10,cis-12-CLA was obtained after incubation of 200 g/L sunflower oil with PAI (1659 U/g of oil) and ROL (625 mU/g of oil) at pH 7...
July 5, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28458168/a-rapid-method-for-estimation-of-pu-isotopes-in-urine-samples-using-high-volume-centrifuge
#18
Ranjeet Kumar, D D Rao, Rupali Dubla, J R Yadav
The conventional radio-analytical technique used for estimation of Pu-isotopes in urine samples involves anion exchange/TEVA column separation followed by alpha spectrometry. This sequence of analysis consumes nearly 3-4 days for completion. Many a times excreta analysis results are required urgently, particularly under repeat and incidental/emergency situations. Therefore, there is need to reduce the analysis time for the estimation of Pu-isotopes in bioassay samples. This paper gives the details of standardization of a rapid method for estimation of Pu-isotopes in urine samples using multi-purpose centrifuge, TEVA resin followed by alpha spectrometry...
July 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28451653/designing-of-blue-green-and-red-cspbx3-perovskite-codoped-flexible-films-with-water-resistant-property-and-elimination-of-anion-exchange-for-tunable-white-light-emission
#19
Jun Hai, Hua Li, Yang Zhao, Fengjuan Chen, Yong Peng, Baodui Wang
We successfully synthesized blue, green, and red CsPbX3 QDs-codoped flexible films using a one-step electrospun strategy, followed by coating a strongly hydrophobic silicone resin on the surface of the films. The codoped flexible light-emitting films are resistant to water, thereby preventing anion exchange and significantly prolonging the lifetime of light emitters under ambient air conditions.
May 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28450173/a-method-for-the-improved-detection-of-aerosolized-influenza-viruses-and-the-male-specific-f-rna-coliphage-ms2
#20
J C Chandler, J W Schaeffer, M Davidson, S L Magzamen, A Pérez-Méndez, S J Reynolds, L D Goodridge, J Volckens, A B Franklin, S A Shriner, B Bisha
The detection of aerosolized viruses can serve as an important surveillance and control tool in agriculture, human health, and environmental settings. Here, we adapted an anion exchange resin-based method, initially developed to concentrate negatively charged viruses from water, to liquid impingement-based bioaerosol sampling. In this method, aerosolized viruses are collected in a 20ml liquid sample contained within widely used impingers, BioSamplers (SKC Inc., Eighty Four, PA), and further concentrated via adsorption to an anion exchange resin that is suspended within this liquid...
April 24, 2017: Journal of Virological Methods
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