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ion exchange resin

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https://www.readbyqxmd.com/read/28822252/removal-of-gadolinium-a-neutron-poison-from-the-moderator-system-of-nuclear-reactors
#1
A L Rufus, Padma S Kumar, K Jeena, S Velmurugan
Gadolinium as gadolinium nitrate is used as neutron poison in the moderator system for regulating and controlling the power generation of Pressurized Heavy Water Reactors (PHWR) and proposed to be used in Advanced Heavy Water Reactors (AHWR) owing to its high neutron absorption cross section. Removal of the added gadolinium nitrate (Gd(3+) and NO3(-)) from the system after its intended use is done using ion exchange resins. In the present investigation, attempts have been made to optimize the ion exchange process for generation of low radioactive waste and maximize utilization of the ion exchange resins by employing different types of resins and different modes of operation...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28806598/automated-synthesis-of-1-11-c-acetoacetate-on-a-trasis-aio-module
#2
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/28796828/acid-free-glyoxal-as-a-substitute-of-formalin-for-structural-and-molecular-preservation-in-tissue-samples
#3
Gianni Bussolati, Laura Annaratone, Enrico Berrino, Umberto Miglio, Mara Panero, Marco Cupo, Patrizia Gugliotta, Tiziana Venesio, Anna Sapino, Caterina Marchiò
Tissue fixation in phosphate buffered formalin (PBF) remains the standard procedure in histopathology, since it results in an optimal structural, antigenic and molecular preservation that justifies the pivotal role presently played by diagnoses on PBF-fixed tissues in precision medicine. However, toxicity of formaldehyde causes an environmental concern and may demand substitution of this reagent. Having observed that the reported drawbacks of commercially available glyoxal substitutes of PBF (Prefer, Glyo-fix, Histo-Fix, Histo-CHOICE, and Safe-Fix II) are likely related to their acidity, we have devised a neutral fixative, obtained by removing acids from the dialdehyde glyoxal with an ion-exchange resin...
2017: PloS One
https://www.readbyqxmd.com/read/28772808/production-of-high-purity-anhydrous-nickel-ii-perrhenate-for-tungsten-based-sintered-heavy-alloys
#4
Katarzyna Leszczyńska-Sejda, Grzegorz Benke, Dorota Kopyto, Tomasz Majewski, Michał Drzazga
This paper presents a method for the production of high-purity anhydrous nickel(II) perrhenate. The method comprises sorption of nickel(II) ions from aqueous nickel(II) nitrate solutions, using strongly acidic C160 cation exchange resin, and subsequent elution of sorbed nickel(II) ions using concentrated perrhenic acid solutions. After the neutralization of the resulting rhenium-nickel solutions, hydrated nickel(II) perrhenate is then separated and then dried at 160 °C to obtain the anhydrous form. The resulting compound is reduced in an atmosphere of dissociated ammonia in order to produce a Re-Ni alloy powder...
April 24, 2017: Materials
https://www.readbyqxmd.com/read/28764325/anion-exchange-fibers-for-improved-sample-loading-in-ultra-trace-analysis-of-plutonium-by-thermal-ionization-mass-spectrometry
#5
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
#6
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/28732156/fixed-bed-modeling-of-nonsteroidal-anti-inflammatory-drug-removal-by-ion-exchange-in-synthetic-urine-mass-removal-or-toxicity-reduction
#7
Kelly Ann Landry, Treavor H Boyer
Ion-exchange removal of nonsteroidal anti-inflammatory drugs (NSAIDs) in synthetic urine can selectively remove pharmaceuticals with minimal co-removal of nutrients to enhance nutrient recovery efforts. However, the effect of endogenous metabolites in urine on ion-exchange removal, and the corresponding reduction in ecotoxicity potential of pharmaceuticals in treated urine entering the environment, is unknown. To assess treatment efficacy, this work paired predicted breakthrough curves determined by the homogenous surface diffusion model to an in vitro bioassay to evaluate COX-1 inhibition...
July 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28715740/rhamnolipid-biosurfactant-complexation-of-rare-earth-elements
#8
David E Hogan, Joan E Curry, Jeanne E Pemberton, Raina M Maier
Rare earth elements (REE) are vital for modern technologies and considered critical materials. This study investigated monorhamnolipid biosurfactant interactions with REE as the basis for REE recovery technology. Conditional stability constants (log β), measured using a resin-based ion exchange method, are reported for 16 REE and metals. These results were combined with existing data for 10 other metals to assess comparative strength and determinants of binding. The stability constants could be divided into three groups: weakly, moderately, and strongly bound...
June 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28655394/orientation-of-monoclonal-antibodies-in-ion-exchange-chromatography-a-predictive-quantitative-structure-activity-relationship-modeling-approach
#9
Jörg Kittelmann, Katharina M H Lang, Marcel Ottens, Jürgen Hubbuch
Chromatographic separation of biopharmaceuticals in general and monoclonal antibodies (mAbs) specifically is the bottleneck in terms of cost and throughput in preparative purification. Still, generalized platform processes are used, neglecting molecule specific characteristics, defining protein-resin interaction terms. Currently used in silico modeling approaches do not consider the orientation of the molecule towards the chromatographic resins as a result of the structural features on an atomic level. This paper describes a quantitative structure-activity relationship (QSAR) approach to model the orientation of mAbs on ion exchange chromatographic matrices as a function of property distribution and mobile phase characteristics...
August 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#10
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/28629233/a-new-antibiotic-produced-by-the-cyanobacterium-symbiotic-fungus-simplicillium-lanosoniveum
#11
Qinglin Dong, Rongzhen Dong, Xiangying Xing, Yukuan Li
The culture broth of the cyanobacterium-symbiotic fungus Simplicillium lanosoniveum var. Tianjinienss Q. L. Dong exhibited unanticipated antibacterial activities against the Gram-positive bacteria, particularly the pathogenic bacterium Staphylococcus aureus, indicating the secretion of antibiotic-like metabolite, for which the modified Sabouraud medium was the suitable medium. The antibiotic-like metabolite was separated with macroporous resins CT-12 (absorption) and 95% ethanol (desorption), purified by ion-exchange resins D301T and displayed a characteristic absorption peak at 228 nm, suggesting the presence of nitrogen...
June 19, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28614537/hba1c-levels-in-individuals-heterozygous-for-hemoglobin-variants
#12
Ricardo Silva Tavares, Fábio Oliveira de Souza, Isabel Cristina Carvalho Medeiros Francescantonio, Weslley Carvalho Soares, Mauro Meira Mesquita
Objective: To evaluate the levels of glycated hemoglobin (HbA1c) in patients heterozygous for hemoglobin variants and compare the results of this test with those of a control group. Method: This was an experimental study based on the comparison of HbA1c tests in two different populations, with a test group represented by individuals heterozygous for hemoglobin variants (AS and AC) and a control group consisting of people with electrophoretic profile AA. The two populations were required to meet the following inclusion criteria: Normal levels of fasting glucose, hemoglobin, urea and triglycerides, bilirubin > 20 mg/dL and non-use of acetylsalicylic acid...
April 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/28583390/relating-saturation-capacity-to-charge-density-in-strong-cation-exchangers
#13
Fabian Steinebach, Bertrand Coquebert de Neuville, Massimo Morbidelli
In this work the relation between physical and chemical resin characteristics and the total amount of adsorbed protein (saturation capacity) for ion-exchange resins is discussed. Eleven different packing materials with a sulfo-functionalization and one multimodal resin were analyzed in terms of their porosity, pore size distribution, ligand density and binding capacity. By specifying the ligand density and binding capacity by the total and accessible surface area, two different groups of resins were identified: Below a ligand density of approx...
May 26, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28561091/design-of-a-highly-active-base-catalyst-through-utilizing-organic-solvent-treated-layered-silicate-hiroshima-university-silicates
#14
Nao Tsunoji, Mahuya Bandyopadhyay, Yuya Yagenji, Hidechika Nishida, Masahiro Sadakane, Tsuneji Sano
Crystalline layered silicates are promising materials for the rational design of innovative catalysts owing to their wide variety and easily tunable surfaces. However, diffusional limitation in their interlayer spaces limits their catalytic efficiency. Herein, we have developed a novel synthesis route to a highly active layered silicate catalyst utilizing Hiroshima University Silicates (HUSs). We attempted to tune the stacking structure of the silicate layers of HUS-2 and HUS-7 ion-exchanged with hexadecyltrimethylammonium (C16TMA) using organic-solvent treatment, and found that cyclohexane treatment of HUS-7 gave an aggregate of randomly restacked silicate nanosheets without degradation of the original silicate framework...
June 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28557424/carbon-dioxide-as-a-traceless-caramelization-promotor-preparation-of-prebiotic-difructose-dianhydrides-dfas-enriched-caramels-from-d-fructose
#15
Maïté Audemar, Loyda Atencio-Genes, Carmen Ortiz Mellet, François Jérôme, José Manuel Garcia Fernandez, Karine De Oliveira Vigier
Activation of a concentrated solution of d-fructose with carbonic acid, generated from carbon dioxide, induces the formation of difructose dianhydrides (DFAs) and their glycosylated derivatives (glycosyl-DFAs), a family of prebiotic oligosaccharides. Under optimized conditions, up to 70% of the active DFA species were obtained from a highly concentrated solution of fructose, avoiding the filtration step and contamination risk associated with the current procedures that employ heterogeneous catalysis with acid ion-exchange resins...
August 2, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28545211/nano-enabling-of-strong-base-ion-exchange-media-via-a-room-temperature-aluminum-hydr-oxide-synthesis-method-to-simultaneously-remove-nitrate-and-fluoride
#16
Jasmina Markovski, Jose Garcia, Kiril D Hristovski, Paul Westerhoff
This study demonstrated a new room-temperature method for synthesizing aluminum (hydr)oxide material inside the pores of strong-base ion-exchange resin to fabricate a novel class of hybrid media capable of simultaneously removing nitrate and fluoride as model groundwater contaminants. The aluminum (hydr)oxide hybrid media was fabricated by reducing aluminum ion precursors with borohydride within ion-exchange resin at room temperature, followed by exposure to environmental oxygen. The hybrid media was characterized, and its performance to simultaneously remove nitrate and fluoride was determined in simple and complex water matrices using short-bed column tests operated under conditions realistic for point-of-use systems...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28523725/differential-attenuation-of-nmr-signals-by-complementary-ion-exchange-resin-beads-for-de-novo-analysis-of-complex-metabolomics-mixtures
#17
Bo Zhang, Jiaqi Yuan, Rafael Brüschweiler
A primary goal of metabolomics is the characterization of a potentially very large number of metabolites that are part of complex mixtures. Application to biofluids and tissue samples offers insights into biochemical metabolic pathways and their role in health and disease. 1D (1) H and 2D (13) C-(1) H HSQC NMR spectra are most commonly used for this purpose. They yield quantitative information about each proton of the mixture, but do not tell which protons belong to the same molecule. Interpretation requires the use of NMR spectral databases, which naturally limits these investigations to known metabolites...
May 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28501995/one-step-preservation-and-decalcification-of-bony-tissue-for-molecular-profiling
#18
Claudius Mueller, Michael G Harpole, Virginia Espina
Bone metastasis from primary cancer sites creates diagnostic and therapeutic challenges. Calcified bone is difficult to biopsy due to tissue hardness and patient discomfort, thus limiting the frequency and availability of bone/bone marrow biopsy material for molecular profiling. In addition, bony tissue must be demineralized (decalcified) prior to histomorphologic analysis. Decalcification processes rely on three main principles: (a) solubility of calcium salts in an acid, such as formic or nitric acid; (b) calcium chelation with ethylenediaminetetraacetic acid (EDTA); or (c) ion-exchange resins in a weak acid...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28494246/catalytic-hydrodechlorination-of-triclosan-using-a-new-class-of-anion-exchange-resin-supported-palladium-catalysts
#19
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
#20
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
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