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Anion exchange resin

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https://www.readbyqxmd.com/read/27916127/in-situ-determination-of-v-v-by-diffusive-gradients-in-thin-films-and-inductively-coupled-plasma-mass-spectrometry-techniques-using-amberlite-ira-410-resin-as-a-binding-layer
#1
Karen Silva Luko, Amauri Antonio Menegário, Carlos Alfredo Suárez, Makenly Tafurt-Cardona, Jorge Henrique Pedrobom, Ana Marta Cavinato Marchini Rolisola, Everton Tiago Sulato, Chang Hung Kiang
Amberlite IRA-410 anionic exchange resin was evaluated as the binding layer for sampling V(V) by using Diffusive Gradients in Thin Films (DGT). V(V) was determined by inductively coupled plasma mass spectrometry (ICP-MS). Mass vs. time DGT deployments (ionic strength = 0.03 mol L(-1) NaNO3, pH = 5.6 and T = 23.5 ± 0.5 °C) was characterized by excellent linear relationship (R(2) = 0.9993) and a significant retention of V(V) by the binding layer. An exchange capacity of at least 40 μg V g(-1) resin was achieved for the proposed binding layer...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27889182/development-of-polyethyleneimine-loaded-core-shell-chitosan-hollow-beads-and-their-application-for-platinum-recovery-in-sequential-metal-scavenging-fill-and-draw-process
#2
Myung-Hee Song, Sok Kim, D Harikishore Kumar Reddy, Wei Wei, John Kwame Bediako, Sangwon Park, Yeoung-Sang Yun
Polyethyleneimine (PEI)-loaded chitosan hollow beads (CHBs) were fabricated through the ionotropic gelation process using sodium tripolyphosphate (TPP) as a counter polyanion. The CHBs were loaded with hydrophilic PEI in pre- and/or post-loading methods. Hence, the sorbent could possess a large number of amine groups which were able to function as the binding sites to recover platinum metal ions. The enhancement of the amine groups was confirmed by Fourier transform infrared spectroscopy (FTIR). Isotherm and kinetic studies were carried out to evaluate the sorption performance of the sorbents...
November 18, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27880923/in-situ-speciation-of-uranium-in-treated-acid-mine-drainage-using-the-diffusion-gradients-in-thin-films-technique-dgt
#3
Jorge Henrique Pedrobom, Carlos Eduardo Eismann, Amauri A Menegário, Juliana Aparecida Galhardi, Karen Silva Luko, Thiago de Araujo Dourado, Chang Hung Kiang
The exchange membranes P81 and DE81 and Chelex-100 resin were used to perform in situ speciation of uranium in treated acid mine drainage at the Osamu Utsumi mining site, Poços de Caldas city, Southeast Brazil. To investigate possible chemical modifications in the samples during analysis, the three ligands were deployed in situ and in a laboratory (in lab). The results obtained in situ were also compared to a speciation performed using Visual MINTEQ software. Chelex-100 retained total labile U for a period of up to 48 h...
November 20, 2016: Chemosphere
https://www.readbyqxmd.com/read/27865455/analysis-of-ustiloxins-in-rice-using-polymer-cation-exchange-cleanup-followed-by-liquid-chromatography-tandem-mass-spectrometry
#4
Zhao-Yun Cao, Li-Hua Sun, Ren-Xiang Mou, Xiao-Yan Lin, Rong Zhou, You-Ning Ma, Ming-Xue Chen
Ustiloxins are cyclopeptide mycotoxins produced by the pathogenic fungus Ustilaginoidea virens of rice false smut. Quantification of ustiloxins is essential to assess the food safety of rice infected by rice false smut disease. This paper describes a sensitive method for the simultaneous quantification of ustiloxins A, B, C, D and F in rice grains using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Since notable matrix enhancement effects (21%-78%) occurred for all of the target analytes (except for ustiloxin A), several solid phase extraction materials were tested for their ability to retain ustiloxins from aqueous solutions prior to the LC-MS/MS analysis, including C18 sorbents, polymer anion exchange sorbents resin (PAX), and polymer cation exchange resin (PCX)...
December 9, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27863738/presence-of-an-adsorbent-cake-layer-improves-the-performance-of-gravity-driven-membrane-gdm-filtration-system
#5
Senlin Shao, Yijing Feng, Huarong Yu, Jiangyun Li, Guibai Li, Heng Liang
Gravity-driven membrane (GDM) filtration is a promising decentralized drinking water treatment process. To improve the performance of GDM system, a thin layer of adsorbent was pre-deposited on the membrane surface prior to filtration (adsorbent-laden GDM system). The tested adsorbents include powdered activated carbon (PAC) and anion exchange resin (AER), and an unmodified GDM system and a SiO2-laden GDM system were used as controls. In the adsorbent-laden GDM systems, the adsorption of the PAC and AER increased the removal efficiency of natural organic matter by 7...
January 1, 2017: Water Research
https://www.readbyqxmd.com/read/27836554/removal-and-recovery-of-vanadium-from-alkaline-steel-slag-leachates-with-anion-exchange-resins
#6
Helena I Gomes, Ashley Jones, Mike Rogerson, Gillian M Greenway, Diego Fernandez Lisbona, Ian T Burke, William M Mayes
Leachable vanadium (V) from steel production residues poses a potential environmental hazard due to its mobility and toxicity under the highly alkaline pH conditions that characterise these leachates. This work aims to test the efficiency of anion exchange resins for vanadium removal and recovery from steel slag leachates at a representative average pH of 11.5. Kinetic studies were performed to understand the vanadium sorption process. The sorption kinetics were consistent with a pseudo-first order kinetic model...
November 8, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27800600/cholestyramine-as-a-promising-strong-anion-exchange-resin-for-direct-capture-of-genetic-biomarkers-from-raw-pancreatic-fluids
#7
Andrew J Hilmer, R Brooke Jeffrey, Walter G Park, Chaitan Khosla
The ability to capture cell-free DNA from the gastrointestinal tract, in a minimally invasive manner, could enhance our ability to diagnose gastrointestinal disease, or gain a better understanding of the spatial mapping of the intestinal microbiota. We therefore sought to identify a class of capture agents that could directly and efficiently sequester genetic material from intestinal fluids. As a particular case study, we examined the ability to capture DNA from pancreatic secretions, for potential application in enabling the sequestration of early, genetic biomarkers of pancreatic disease...
November 1, 2016: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/27777078/field-based-evaluation-of-a-male-specific-f-rna-coliphage-concentration-method
#8
J C Chandler, A Pérez-Méndez, J Paar, M M Doolittle, B Bisha, L D Goodridge
Fecal contamination of water poses a significant risk to public health due to the potential presence of pathogens, including enteric viruses. Therefore, sensitive, reliable and easy to use methods for the concentration, detection and quantification of microorganisms associated with the safety and quality of water are needed. In this study, we performed a field evaluation of an anion exchange resin-based method to concentrate male-specific (F+) RNA coliphages (FRNA), fecal indicator organisms, from diverse environmental waters that were suspected to be contaminated with feces...
January 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/27771541/comparison-of-different-advanced-treatment-processes-in-removing-endocrine-disruption-effects-from-municipal-wastewater-secondary-effluent
#9
Jie Sun, Jing Wang, Rui Zhang, Dongyang Wei, Qin Long, Yu Huang, Xianchuan Xie, Aimin Li
In this study, secondary effluent from the Wulongkou (WLK) municipal wastewater plant (Zhengzhou, China) was tested for its toxicity effects before and after five advanced treatment processes (ATPs, i.e. coagulation sedimentation, nan da magnetic polyacrylic anion exchange resin (NDMP) resin adsorption, activated carbon adsorption, ozonation and electro-adsorption). Results showed that estrogen disruption effects (EDEs) were particularly significant for the raw secondary effluent among the studied dioxin-like toxicity effect, androgenic/anti-androgenic response effect, EDEs, and genotoxicity effect...
October 20, 2016: Chemosphere
https://www.readbyqxmd.com/read/27768275/integrating-weak-anion-exchange-and-ultraviolet-photodissociation-mass-spectrometry-with-strategic-modulation-of-peptide-basicity-for-the-enrichment-of-sulfopeptides
#10
Michelle R Robinson, Jennifer S Brodbelt
Tyrosine sulfation is an important post-translational modification but remains difficult to detect in biological samples owing to its low stoichiometric abundance and the lack of effective enrichment methods. In the present study, weak anion exchange (WAX) is evaluated for the enrichment of sulfopeptides that have been modified via carbamylation to convert all primary amines to less basic carbamates. The decrease in basicity enhanced the binding of carbamylated sulfopeptides to WAX resin relative to non-sulfated peptides...
October 21, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27766703/a-simple-and-reliable-anion-exchange-resin-method-for-sulfate-extraction-and-purification-suitable-for-multiple-o-and-s-isotope-measurements
#11
Erwann Le Gendre, Erwan Martin, Benoit Villemant, Pierre Cartigny, Nelly Assayag
RATIONALE: The O- and S- isotope compositions of sulfates can be used as key tracers of the fate and sink of sulfate in both terrestrial and extra-terrestrial environments. However, their application remains limited in those geological systems where sulfate occurs in low concentrations. Here we present a simple and reliable method to extract, purify and concentrate sulfate from natural samples. The method allows us to take into account the separation of nitrate, which is known to be an issue in O-isotope analysis...
October 21, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27725606/interactions-of-anion-exchange-resins-with-polyacrylates-in-atmosphere
#12
Hiroya Tauchi, Yasumoto Sakai, Noriyuki Okawa, Hanifa Faozia, Genki Mizuguchi, Takashi Yasui, Kazutake Takada, Akio Yuchi
The interactions of polyacrylates (PAs with mean molecular weight of 4.5, 25, and 250 kDa; Na(+),pa(-)) with anion exchange resins in the Br(-) form (AXRs; -R(+),Br(-)) were studied under practical conditions by reaction stoichiometry and spectroscopy. The stoichiometric or an excess amount of PA(4.5 kDa) completely replaced Br- in the AXRs of the cross-linking degree of 2 or 8%, respectively, to give (-R(+),pa(-)), due to enhancement in selectivity of carboxylate group by multiple interactions. In contrast, PA(250 kDa) exchanged Br(-) only on the surface of AXRs and did not penetrate into the resins; CO2 was involved in the system to induce exchange with CO3(2-)...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/27688175/multiple-simultaneous-independent-gradients-for-a-versatile-multidimensional-liquid-chromatography-part-ii-application-1-large-increases-in-isoform-resolution-of-human-transferrin-by-use-of-dual-simultaneous-independent-gradients-of-ph-acetonitrile-on-a-mixed
#13
Latchezar I Tsonev, Allen G Hirsh
We have previously described a liquid chromatographic (LC) method for uncoupling controlled, wide range pH gradients and simultaneous controlled gradients of a non-buffering solute on ion exchange resins (Hirsh and Tsonev, 2012) [1]. Here we report the application of this two dimensional LC technique to the problem of resolving Human Transferrin (HT) isoforms. This important iron transporting protein should theoretically occur in several thousand glycoforms, but only about a dozen have been reported. Using dual simultaneous independent gradients (DSIGs) of acetonitrile (ACN) and pH on a mixed bed stationary phase (SP) consisting of a mixture of an anion exchange resin and a reversed phase (RP) resin we partially resolve about 60 isoforms...
October 14, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27687185/diffusive-gradients-in-thin-films-measurement-of-sulfur-stable-isotope-variations-in-labile-soil-sulfate
#14
Ondrej Hanousek, Jakob Santner, Sean Mason, Torsten W Berger, Walter W Wenzel, Thomas Prohaska
A diffusive gradient in thin films (DGT) technique, based on a strongly basic anion exchange resin (Amberlite IRA-400), was successfully tested for (34)S/(32)S analysis in labile soil sulfate. Separation of matrix elements (Na, K, and Ca) that potentially cause non-spectral interferences in (34)S/(32)S analysis by MC ICP-MS (multi-collector inductively coupled plasma-mass spectrometry) during sampling of sulfate was demonstrated. No isotopic fractionation caused by diffusion or elution of sulfate was observed below a resin gel disc loading of ≤79 μg S...
November 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27664659/an-efficient-method-for-decoloration-of-polysaccharides-from-the-sprouts-of-toona-sinensis-a-juss-roem-by-anion-exchange-macroporous-resins
#15
Yingying Shi, Tingting Liu, Yun Han, Xiufang Zhu, Xiaojuan Zhao, Xijun Ma, Dingyun Jiang, Qianghua Zhang
An efficient decoloration method for polysaccharides from the sprouts of Toona sinensis (A. Juss.) Roem (PSTS) by anion exchange macroporous resins (AEMR) was investigated in the present paper. The results suggested that D941 resin offered better decoloration efficiency than other tested resins. Based on single-factor experiments, the optimal decoloration parameters of D941 resin were obtained as follows: temperature of 45°C, sample initial concentration of 30mg/ml, pH value of 8.5, static decoloration time of 90min, dynamic decoloration processing volume of 5...
February 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27623064/transesterification-of-propylene-glycol-methyl-ether-in-chromatographic-reactors-using-anion-exchange-resin-as-a-catalyst
#16
Jungmin Oh, Balamurali Sreedhar, Megan E Donaldson, Timothy C Frank, Alfred K Schultz, Andreas S Bommarius, Yoshiaki Kawajiri
Reactive chromatography using an anion exchange resin is proposed for a transesterification reaction of propylene glycol methyl ether (DOWANOL™ PM) with ethyl acetate to produce propylene glycol methyl ether acetate (DOWANOL™ PMA). This reaction is studied in batch and chromatographic reactors catalyzed by an anion exchange resin. Several anion exchange resins are tested and compared based on the performance of resin as an adsorbent and a catalyst. A chromatographic column is packed with a selected catalyst, AMBERLITE™ IRA904, and both reaction and chromatographic elution are studied at different temperatures and feed concentrations...
September 30, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27614730/separation-of-thorium-and-uranium-in-nitric-acid-solution-using-silica-based-anion-exchange-resin
#17
Yanliang Chen, Yuezhou Wei, Linfeng He, Fangdong Tang
To separate thorium and uranium in nitric acid solution using anion exchange process, a strong base silica-based anion exchange resin (SiPyR-N4) was synthesized. Batch experiments were conducted and the separation factor of thorium and uranium in 9M nitric acid was about 10. Ion exchange chromatography was applied to separate thorium and uranium in different ratios. Uranium could be eluted by 9M nitric acid and thorium was eluted by 0.1M nitric acid. It was proved that thorium and uranium can be separated and recovered successfully by this method...
September 30, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27591651/reference-measurements-for-total-mercury-and-methyl-mercury-content-in-marine-biota-samples-using-direct-or-species-specific-isotope-dilution-inductively-coupled-plasma-mass-spectrometry
#18
Agnieszka Krata, Emilia Vassileva, Ewa Bulska
The analytical procedures for reference measurements of the total Hg and methyl mercury (MeHg) mass fractions at various concentration levels in marine biota samples, candidates for certified reference materials (oyster and clam Gafrarium tumidum), were evaluated. Two modes of application of isotope dilution inductively coupled plasma mass spectrometry method (ID ICP-MS), namely direct isotope dilution and species-specific isotope dilution analysis with the use of two different quantification mass spectrometry techniques were compared...
November 1, 2016: Talanta
https://www.readbyqxmd.com/read/27587007/impact-of-ozonation-anion-exchange-resin-and-uv-h2o2-pre-treatments-to-control-fouling-of-ultrafiltration-membrane-for-drinking-water-treatment
#19
Biplob Kumar Pramanik, Sagor Kumar Pramanik, Dipok Chandra Sarker, Fatihah Suja
The effects of ozonation, anion exchange resin (AER) and UV/H2O2 were investigated as a pre-treatment to control organic fouling (OF) of ultrafiltration membrane in the treatment of drinking water. It was found that high molecular weight (MW) organics such as protein and polysaccharide substances were majorly responsible for reversible fouling which contributed to 90% of total fouling. The decline rate increased with successive filtration cycles due to deposition of protein content over time. All pre-treatment could reduce the foulants of a Ultrafiltration membrane which contributed to the improvement in flux, and there was a greater improvement of flux by UV/H2O2 (61%) than ozonation (43%) which in turn was greater than AER (23%) treatment...
September 20, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27580213/efficient-preparation-of-high-quality-64-cu-for-routine-use
#20
Tomoyuki Ohya, Kotaro Nagatsu, Hisashi Suzuki, Masami Fukada, Katsuyuki Minegishi, Masayuki Hanyu, Toshimitsu Fukumura, Ming-Rong Zhang
INTRODUCTION: Copper-64 is an attractive radionuclide for positron emission tomography and is emerging as a radiotherapeutic agent. The demand of (64)Cu with low metallic impurities has increased because of its wide applications when incorporated with antibodies, peptides, and proteins. In this study, we propose a new separation method to produce high-quality (64)Cu using a cation exchange column, as well as an automated separation system suitable for large-scale production. METHODS: (64)Cu was produced from an electrodeposited (64)Ni target via the (64)Ni(p,n)-reaction with a 24MeV HH+ beam at 10eμA (electrical microampere) conducted for 1-3h...
July 30, 2016: Nuclear Medicine and Biology
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