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Anion exchange resin

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https://www.readbyqxmd.com/read/28087056/extraction-chromatographic-separations-of-tantalum-and-tungsten-from-hafnium-and-complex-matrix-constituents
#1
Mathew S Snow, Martha R Finck, Kevin P Carney, Samuel S Morrison
Tantalum (Ta), hafnium (Hf), and tungsten (W) analyses from complex matrices require high purification of these analytes from each other and major/trace matrix constituents, however, current state-of-the-art Ta/Hf/W separations rely on traditional anion exchange approaches that show relatively similar distribution coefficient (Kd) values for each element. This work reports an assessment of three commercially available extraction chromatographic resins (TEVA, TRU, and UTEVA) for Ta/Hf/W separations. Batch contact studies show differences in Ta/Hf and Ta/W Kd values of up to 10(6) and 10(4) (respectively), representing an improvement of a factor of 100 and 300 in Ta/Hf and Ta/W Kd values (respectively) over AG1×4 resin...
January 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28063313/desulfurization-critical-step-towards-enhanced-selenium-removal-from-industrial-effluents
#2
Lucian C Staicu, Nadia Morin-Crini, Grégorio Crini
Selenium (Se) removal from synthetic solutions and from real Flue Gas Desulfurization (FGD) wastewater generated by a coal-fired power plant was studied for the first time using a commercial iron oxide impregnated strong base anion exchange resin, Purolite(®) FerrIX A33E. In synthetic solutions, the resin showed high affinity for selenate and selenite, while sulfate exhibited a strong competition for both oxyanions. The FGD wastewater investigated is a complex system that contains Se (∼1200 μg L(-1)), SO4(2-) (∼1...
December 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/28040870/innovative-methods-to-generate-clean-sugar-stream-from-biomass-feedstocks-for-efficient-fermentation
#3
REVIEW
Jung-Eun Lee, Yadhu N Guragain, Krishna P Bastola, Praveen V Vadlani
Sorghum stalks were evaluated to generate clean sugars; enzymatic hydrolysis efficiency of acid pretreated biomass was significantly low (12.3 g sugar/g pretreated biomass) compared to alkali method (49.1 g sugar/g pretreated biomass). Inhibitory compounds derived from acid pretreatment, such as hydroxymethyl furfural (HMF) and furfural, were effectively removed using an appropriate detoxification method using 1% (w/v) activated charcoal. The resin mixture containing cationic exchangers (DOWEX 50WX8) and anionic exchangers (IRA 743) in 7:3 ratio at pH 2...
December 31, 2016: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28034431/algal-uptake-of-dissolved-organic-nitrogen-in-wastewater-treatment-plants
#4
Jingtian Zhang, Mingzhou Su, Beidou Xi, Guangren Qian, Jianyong Liu, Fei Hua, Shouliang Huo
The algal uptake of dissolved organic nitrogen (DON) in the anaerobic-anoxic-oxic (A2O) process was investigated in this study. Anaerobic, aerobic and effluent DON samples from two wastewater treatment plants (WWTPs) were separated into hydrophilic and hydrophobic fractions using a DAX-8 resin coupled with an anion exchange resin and a nanofiltration (NF) pretreatment. Hydrophilic DON accounted for 66.66%-88.74% of the entire DON for the two plants evaluated. After a 15-day incubation, 16.95%-91.75% DON was bioavailable for algal growth, and untreated samples exhibited higher DON bioavailability, with 52...
December 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28018490/detecting-levels-of-polyquaternium-10-pq-10-via-potentiometric-titration-with-dextran-sulphate-and-monitoring-the-equivalence-point-with-a-polymeric-membrane-based-polyion-sensor
#5
Stephen A Ferguson, Xuewei Wang, Mark E Meyerhoff
Polymeric quaternary ammonium salts (polyquaterniums) have found increasing use in industrial and cosmetic applications in recent years. More specifically, polyquaternium-10 (PQ-10) is routinely used in cosmetic applications as a conditioner in personal care product formulations. Herein, we demonstrate the use of potentiometric polyion-sensitive polymeric membrane-based electrodes to quantify PQ-10 levels. Mixtures containing both PQ-10 and sodium lauryl sulfate (SLS) are used as model samples to illustrate this new method...
August 7, 2016: Analytical Methods: Advancing Methods and Applications
https://www.readbyqxmd.com/read/27997072/structural-and-performance-characteristics-of-representative-anion-exchange-resins-used-for-weak-partitioning-chromatography
#6
Shaojie Zhang, Tim Iskra, William Daniels, Jeffrey Salm, Christopher Gallo, Ranga Godavarti, Giorgio Carta
Weak partitioning chromatography (WPC) has been proposed for the purification of monoclonal antibodies using an anion exchange (AEX) resin to simultaneously remove both acidic and basic protein impurities. Despite potential advantages, the relationship between resin structure and WPC performance has not been evaluated systematically. In this work, we determine the structure of representative AEX resins (Fractogel® EMD TMAE HiCap, Q Sepharose FF, and POROS 50 HQ) using transmission electron microscopy and inverse size exclusion chromatography and characterize protein interactions while operating these resins under WPC conditions using two mAb monomers, a mAb dimer, mAb multimers, and BSA as model products and impurities...
December 20, 2016: Biotechnology Progress
https://www.readbyqxmd.com/read/27989937/unearthing-bulgakov-s-trace-proteome-from-the-master-i-margarita-manuscript
#7
Gleb Zilberstein, Uriel Maor, Emmanuil Baskin, Alfonsina D'Amato, Pier Giorgio Righetti
: Ten pages, selected from a total of 127, of the last manuscript of Master i Margarita, written by Bulgakov in the last four years of his life, have been analysed in order to harvest and identify any trace proteome left on the margin by the novelist, in the hope of finding biomarkers of his fatal nephrotic syndrome. To that aim, we prepared a special ethyl-vinyl acetate film as binder of ground AG 501 Bio-Rad mix-bed strong cation/strong anion exchange resins for adsorbing any protein left on the margins of the pages via saliva and/or sweat...
January 30, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/27939321/transfer-of-a-three-step-mab-chromatography-process-from-batch-to-continuous-optimizing-productivity-to-minimize-consumable-requirements
#8
Xhorxhi Gjoka, Rene Gantier, Mark Schofield
The goal of this study was to adapt a batch mAb purification chromatography platform for continuous operation. The experiments and rationale used to convert from batch to continuous operation are described. Experimental data was used to design chromatography methods for continuous operation that would exceed the threshold for critical quality attributes and minimize the consumables required as compared to batch mode of operation. Four unit operations comprising of Protein A capture, viral inactivation, flow-through anion exchange (AEX), and mixed-mode cation exchange chromatography (MMCEX) were integrated across two Cadence BioSMB PD multi-column chromatography systems in order to process a 25L volume of harvested cell culture fluid (HCCF) in less than 12h...
January 20, 2017: Journal of Biotechnology
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
#9
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
#10
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...
February 15, 2017: 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
#11
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...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27865455/analysis-of-ustiloxins-in-rice-using-polymer-cation-exchange-cleanup-followed-by-liquid-chromatography-tandem-mass-spectrometry
#12
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
#13
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
#14
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...
February 1, 2017: 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
#15
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
#16
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
#17
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...
February 2017: 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
#18
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 nonsulfated peptides...
November 15, 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
#19
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...
January 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27725606/interactions-of-anion-exchange-resins-with-polyacrylates-in-atmosphere
#20
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
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