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Anion exchange resin

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https://www.readbyqxmd.com/read/29128590/synthesis-and-characterization-of-a-new-soluble-soybean-polysaccharide-iron-iii-complex-using-ion-exchange-column
#1
Wenhong Gao, Yangping Huang, Ruixue He, Xin-An Zeng
A new ion exchange column method was investigated to synthesize the soluble soybean polysaccharide-iron(III) complex (SSPS-FeIII(1)) using soluble soybean polysaccharides (SSPS). The feasibility of ion exchange column reaction was explored firstly. Results indicated the D730 anion macroporous adsorption resin could effectively absorb SSPS and the static adsorption saturation time was 20h. The iron content of the complex reached up to 15.07% when trisodium citrate concentration was 2mg/mL. The structure of SSPS-FeIII complex synthesized by this method (SSPS-FeIII1(2)) was compared with that prepared by trisodium citrate - ferric chloride method (SSPS-FeIII2(3))...
November 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29100119/simultaneous-uptake-of-nom-and-microcystin-lr-by-anion-exchange-resins-effect-of-inorganic-ions-and-resin-regeneration
#2
Fuhar Dixit, Benoit Barbeau, Madjid Mohseni
This study investigated the efficiency of a strongly basic macroporous anion exchange resin for the co-removal of Microcystin-LR (MCLR) and natural organic matter (NOM) in waters affected by toxic algal blooms. Environmental factors influencing the uptake behavior included MCLR and resin concentrations, NOM and anionic species, specifically nitrate, sulphate and bicarbonate. A860 resin exhibited an excellent adsorption capacity of 3800 μg/g; more than 60% of the MCLR removal was achieved within 10 min with a resin dosage of 200 mg/L (∼1 mL/L)...
October 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/29096150/comparison-of-different-methodologies-for-the-90-sr-determination-in-environmental-samples
#3
Željko Grahek, Silvia Dulanská, Gorana Karanović, Ivana Coha, Ivana Tucaković, Marijana Nodilo, Ľubomír Mátel
The paper describes different isolation/separation and detection procedures for (90)Sr determination in the environmental samples which are routinely used in Laboratories A and B. In this context, four different methods for strontium isolation and two methods for detection were tested and compared by (90)Sr determination in proficiency test samples (water, soil, vegetation) and animal bone samples. The chromatographic isolation of Sr on Sr resin, AnaLig(®)Sr01 resin gel, strong base anion exchange resins in nitrate form and combination of strong base anion exchange and Sr resin were used for the examination of the impact of sample matrix constituents on efficiency of strontium isolation (chemical yield), while Cherenkov counting of (90)Y and counting of (90)Sr((90)Y) on proportional counter were used for the quantitative (90)Sr determination...
October 28, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29080819/isolation-purification-and-antioxidant-activity-of-polysaccharides-from-the-leaves-of-maca-lepidium-meyenii
#4
Kang Caicai, Hao Limin, Zhang Liming, Zheng Zhiqiang, Yang Yongwu
Two fractions of polysaccharides (MLP-1 and MLP-2) were extracted from the leaves of maca (Lepidium Meyenii Walp.) by water, and purified using DEAE-52 ion exchange resin and sephadex G-200 clumns chromatography. An investigation was carried out for their structural characterization and antioxidant activity in vitro. The results indicated that MLP-1 was mainly composed of ribose, rhamnose, arabinose, xylose, mannose, glucose and galactose, with the molar ratio of 0.12:0.32:1.50:0.32:1.03:1.00:0.93; the MLP-2 was a homopolysaccharide composed of glucose...
October 25, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29080542/effect-of-pore-structure-on-the-removal-of-clofibric-acid-by-magnetic-anion-exchange-resin
#5
Liang Tan, Chendong Shuang, Yunshu Wang, Jun Wang, Yihong Su, Aimin Li
The effect of pore structure of resin on clofibric acid (CA) adsorption behavior was investigated by using magnetic anion exchange resins (ND-1, ND-2, ND-3) with increasing pore diameter by 11.68, 15.37, 24.94 nm. Resin with larger pores showed faster adsorption rates and a higher adsorption capacity because the more opened tunnels provided by larger pores benefit the CA diffusion into the resin matrix. The ion exchange by the electrostatic interactions between Cl-type resin and CA resulted in chloride releasing to the solution, and the ratio of released chloride to CA adsorption amount decreased from 0...
October 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29078192/n-nitrosodimethylamine-ndma-and-its-precursors-in-water-and-wastewater-a-review-on-formation-and-removal
#6
REVIEW
Massimiliano Sgroi, Federico G A Vagliasindi, Shane A Snyder, Paolo Roccaro
This review summarizes major findings over the last decade related to N-Nitrosodimethylamine (NDMA) in water and wastewater. In particular, the review is focused on the removal of NDMA and of its precursors by conventional and advanced water and wastewater treatment processes. New information regarding formation mechanisms and precursors are discussed as well. NDMA precursors are generally of anthropogenic origin and their main source in water have been recognized to be wastewater discharges. Chloramination is the most common process that results in formation of NDMA during water and wastewater treatment...
October 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29075891/efficient-in-situ-separation-and-production-of-l-lactic-acid-by-bacillus-coagulans-using-weak-basic-anion-exchange-resin
#7
Yitong Zhang, Zijun Qian, Peng Liu, Lei Liu, Zhaojuan Zheng, Jia Ouyang
To get rid of the dependence on lactic acid neutralizer, a simple and economical approach for efficient in situ separation and production of L-lactic acid was established by Bacillus coagulans using weak basic anion-exchange resin. During ten tested resins, the 335 weak basic anion-exchange resins demonstrated the highest adsorption capacity and selectivity for lactic acid recovery. The adsorption study of the 335 resins for lactic acid confirmed that it is an efficient adsorbent under fermentation condition...
October 26, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28991211/determination-of-cadmium-in-brown-rice-samples-by-fluorescence-spectroscopy-using-a-fluoroionophore-after-purification-of-cadmium-by-anion-exchange-resin
#8
Akira Hafuka, Akiyoshi Takitani, Hiroko Suzuki, Takuya Iwabuchi, Masahiro Takahashi, Satoshi Okabe, Hisashi Satoh
Simple analytical methods are needed for determining the cadmium (Cd) content of brown rice samples. In the present study, we developed a new analytical procedure consisting of the digestion of rice using HCl, Cd purification using anion exchange resin, and then determining the Cd content using fluorescence spectroscopy. Digestion with 0.1 M HCl for 10 min at room temperature was sufficient to extract Cd from the ground rice samples. The Cd in the extract was successfully purified in preference to other metals using Dowex 1X8 chloride form resin...
October 9, 2017: Sensors
https://www.readbyqxmd.com/read/28965031/utilizing-ion-exchange-resin-to-improve-recovery-from-organic-shock-loading-in-an-anmbr-treating-sewage-sludge
#9
Ana D Martin-Ryals, Lance C Schideman, Kathryn Guy
The addition of ion-exchange resin in a two-phase continuous AnMBR system treating primary sludge at ambient temperature (20 °C) was investigated as a means to improve reactor recovery after organic shock-loading. Four commercially available anion-exchange resins were evaluated for their ability to sorb soluble organics, specifically volatile fatty acids (VFA), from AnMBR effluent. The strong-base resin, Purolite TANEX, was determined the best resin for deployment in the continuous AnMBR having achieved the greatest removal of soluble chemical oxygen demand (sCOD) (up to 36%) and acetic acid (up to 48%) in preliminary batch testing...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/28950202/hot-rolling-sludge-incineration-suppression-of-pcdd-fs-by-spent-anion-exchange-resins
#10
Shuaixi Xu, Tong Chen, Mengmei Zhang, Alfons Buekens, Yongmei Yu, Yanyan Ling, Zhiliang Chen, Xiaodong Li
Steel industry is the main industrial source of 'dioxins', i.e. polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). These arise mainly in the off-gas from sintering plant, yet also other operations, such as continuous casting, and hot and cold rolling could generate albeit minor amounts of dioxins. In this contribution it is verified in how far the incineration of hot rolling sludge (HRS) could contribute to such emissions and, if so, how these could be suppressed at low cost. Spent anion exchange resin (SAER) appeared as a dioxins suppressant during combustion tests of hot rolling sludge in a bench-scale tubular furnace...
July 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28923588/development-of-silver-nanoparticle-doped-adsorbents-for-the-separation-and-recovery-of-radioactive-iodine-from-alkaline-solutions
#11
Taewoon Kim, Seung-Kon Lee, Suseung Lee, Jun Sig Lee, Sang Wook Kim
Removing radioactive iodine from solutions containing fission products is essential for nuclear facility decontamination, radioactive waste treatment, and medical isotope production. For example, the production of high-purity fission (99)Mo by irradiation of (235)U with neutrons involves the removal of iodine from an alkaline solution of the irradiated target (which contains numerous fission products and a large quantity of aluminate ions) using silver-based materials or anion-exchange resins. To be practically applicable, the utilized iodine adsorbent should exhibit a decontamination factor of at least 200...
November 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28916097/determination-of-99-tc-in-fresh-water-using-tru-resin-by-icp-ms
#12
Nicolas Guérin, Remi Riopel, Sheila Kramer-Tremblay, Nimal de Silva, Jack Cornett, Xiongxin Dai
Technetium-99 ((99)Tc) determination at trace level by inductively coupled plasma mass spectrometry (ICP-MS) is challenging because there is no readily available appropriate Tc isotopic tracer. A new method using Re as a recovery tracer to determine (99)Tc in fresh water samples, which does not require any evaporation step, was developed. Tc(VII) and Re(VII) were pre-concentrated on a small anion exchange resin (AER) cartridge from one litre of water sample. They were then efficiently eluted from the AER using a potassium permanganate (KMnO4) solution...
October 2, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28890550/electrochemical-fluorination-and-radiofluorination-of-methyl-phenylthio-acetate-using-tetrabutylammonium-fluoride-tbaf
#13
Mehrdad Balandeh, Christopher Waldmann, Daniela Shirazi, Adrian Gomez, Alejandra Rios, Nathanael Allison, Asad Khan, Saman Sadeghi
Electrochemical fluorination of methyl(phenylthio)acetate was achieved using tetrabutylammonium fluoride (TBAF). Electrochemical fluorination was performed under potentiostatic anodic oxidation using an undivided cell in acetonitrile containing TBAF and triflic acid. The influence of several parameters including: oxidation potential, time, temperature, sonication, TBAF concentration and triflic acid concentration on fluorination efficiency were studied. It was found that the triflic acid to TBAF concentration ratio plays a key role in the fluorination efficiency...
2017: Journal of the Electrochemical Society
https://www.readbyqxmd.com/read/28884511/effects-of-ph-conductivity-host-cell-protein-and-dna-size-distribution-on-dna-clearance-in-anion-exchange-chromatography-media
#14
Melani C Stone, Jon Borman, Gisela Ferreira, P David Robbins
Flowthrough anion exchange chromatography is commonly used as a polishing step in downstream processing of monoclonal antibodies and other therapeutic proteins to remove process-related impurities and contaminants such as host cell DNA, host cell proteins, endotoxin, and viruses. DNA with a wide range of molecular weight distributions derived from Chinese Hamster Ovary cells was used to advance the understanding of DNA binding behavior in selected anion exchange media using the resin (Toyopearl SuperQ-650M) and membranes (Mustang® Q and Sartobind(®) Q) through DNA spiking studies...
September 7, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28871789/production-and-purification-of-the-native-saccharomyces-cerevisiae-hsp12-in-escherichia-coli
#15
Antoine Léger, Agnès Hocquellet, Wilfrid Dieryck, Virginie Moine, Axel Marchal, Philippe Marullo, Annabelle Josseaume, Charlotte Cabanne
Hsp12 is a small heat shock protein produced in many organisms, including the yeast Saccharomyces cerevisiae. It has been described as an indicator of yeast stress rate and has also been linked to the sweetness sensation of wine. To obtain a sufficient amount of protein, we produced and purified Hsp12 without tag in Escherichia coli. A simple fast two-step process was developed using a microplate approach and a design of experiments. A capture step on an anion-exchange salt-tolerant resin was followed by size exclusion chromatography for polishing, leading to a purity of 97%...
September 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28869668/intermediate-purification-of-cho-derived-recombinant-human-factor-ix-using-hydrophobic-interaction-membrane-based-chromatography-and-its-comparison-to-a-sulfated-resin
#16
Daniel A Ribeiro, Douglas F Passos, Helen C Ferraz, Leda R Castilho
This work investigated the use of hydrophobic interaction membrane chromatography for intermediate purification of recombinant human Factor IX (rFIX) produced by CHO cells. The first purification step was based on a strong anion exchange monolith, thus forming a purification process fully based on convective media, which allow operation at high flow rates and low pressure drops, as well as modular scale-up. Although the starting material was challenging (CHO cell culture supernatant harvested at 70% cell viability), the two-step purification process showed promising results, with a global purification factor of 298, a global recovery of 69%, and DNA and endotoxin levels close to regulatory limits...
September 4, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28869054/onsite-defluoridation-system-for-drinking-water-treatment-using-calcium-carbonate
#17
Elaine Y Wong, Michael K Stenstrom
Fluoride in drinking water has several effects on teeth and bones. At concentrations of 1-1.5 mg/L, fluoride can strengthen enamel, improving dental health, but at concentrations above 1.5 to 4 mg/L can cause dental fluorosis. At concentrations of 4-10 mg/L, skeletal fluorosis can occur. There are many areas of the world that have excessive fluoride in drinking water, such as China, India, Sri Lanka, and the Rift Valley countries in Africa. Treatment solutions are needed, especially in poor areas where drinking water treatment plants are not available...
August 28, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28841986/indirect-determination-of-pentaerythritol-tetranitrate-petn-with-a-gold-nanoparticles-based-colorimetric-sensor
#18
Ayşem Üzer, Uğur Yalçın, Ziya Can, Erol Erçağ, Reşat Apak
Pentaerythritol tetranitrate (PETN) is the nitrate ester of pentaerythritol, used as an energetic and filling material for military and civilian purposes and rarely for terrorist actions. As there is no reliable nano-colorimetric method for PETN assay, we developed an indirect method based on the determination of nitrite, obtained by reduction of nitrate derived from the alkaline hydrolysis of PETN with H2O2. We colorimetrically determined the final product, nitrite, by both conventional Griess reaction and a recently developed gold nanoparticle-4-aminothiophenol-N-(1-naphthyl)-ethylenediamine (AuNP-4-ATP+NED) method...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28822252/removal-of-gadolinium-a-neutron-poison-from-the-moderator-system-of-nuclear-reactors
#19
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...
January 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28806598/automated-synthesis-of-1-11-c-acetoacetate-on-a-trasis-aio-module
#20
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...
November 2017: Applied Radiation and Isotopes
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