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Anion exchange resin

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https://www.readbyqxmd.com/read/28194960/a-new-method-for-non-invasive-analysis-of-proteins-and-small-molecules-from-ancient-objects
#1
Marcello Manfredi, Elettra Barberis, Fabio Gosetti, Eleonora Conte, Giorgio Gatti, Clara Mattu, Elisa Robotti, Gleb Zilberstein, Igor Koman, Svetlana Zilberstein, Emilio Marengo, Pier Giorgio Righetti
Proteins and small molecules from ancient objects and cultural heritage can provide key information and contribute to study the context of objects and artists. However, all present- day protocols and strategies for the analysis of ancient samples are often invasive and require micro sampling. Here, we present a new method for the non-invasive analysis of proteins and small molecules: the technique uses a special ethyl-vinyl acetate film functionalized with strong cation/anion exchange and C8 resins, for interacting with both proteins and small molecules present on the surface of the objects, followed by LC-MS/MS analysis...
February 8, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28190834/perchlorate-selectivity-of-anion-exchange-resins-as-evaluated-using-ion-selective-electrodes
#2
Kenji Yamamoto, Shin'ya Mitsuda, Naomi Ohtake, Natsuki Murashige, Satoshi Ohmuro, Akio Yuchi
The selectivity coefficients reported for perchlorate of the high selectivity on anion exchange resins (AXRs) have not been consistent with one another. Possible errors by the unique use of four parameters (concentrations of two anions in two phases) were experimentally verified. The concentrations of perchlorate buffered at low levels (10(-6) - 10(-4) mol L(-1)) by two forms of AXRs were successfully determined by potentiometry with a perchlorate ion-selective electrode. This gave reasonable coefficients. The coefficients for perchlorate on several AXRs were independent of the relative exchange (RE), in contrast to the previous reports...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28169514/tracking-the-superefficient-anion-exchange-of-a-dynamic-porous-material-constructed-by-ag-i-nitrate-and-tripyridyltriazole-via-multistep-single-crystal-to-single-crystal-transformations
#3
Cheng-Peng Li, Bo-Lan Liu, Lei Wang, Yue Liu, Jia-Yue Tian, Chun-Sen Liu, Miao Du
To avoid the instability and inefficiency for anion-exchange resins and layered double-hydroxides materials, we present herein a flexible coordination network [Ag(L(243))](NO3)(H2O)(CH3CN) (L(243) = 3-(2-pyridyl)-4-(4-pyridyl)-5-(3-pyridyl)-1,2,4-triazole) with superefficient trapping capacity for permanganate, as a group-7 oxoanion model for radiotoxic pertechnetate pollutant. Furthermore, a high-throughput screening strategy has been developed based on concentration-gradient design principle to ascertain the process and mechanism for anion exchange...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28149527/high-performance-of-a-unique-mesoporous-polystyrene-based-adsorbent-for-blood-purification
#4
Jian Chen, Wenyan Han, Jie Chen, Wenhui Zong, Weichao Wang, Yue Wang, Guanghui Cheng, Chunran Li, Lailiang Ou, Yaoting Yu
A multi-functional polystyrene based adsorbent (NKU-9) with a unique mesoporous and a high surface area was prepared by suspension polymerization for removal of therapeutic toxins in blood purification. The adsorbent produced had an almost equal amount of mesopore distribution in the range from 2 to 50 nm. The adsorption of serum toxins with different molecular weights were examined by in vitro adsorption assays and compared with some clinical currently used adsorbents such as HA-330, Cytosorb and BL-300 which are produced by China, America and Japan, respectively...
February 2017: Regenerative Biomaterials
https://www.readbyqxmd.com/read/28126572/adsorption-performance-of-salicylic-acid-on-a-novel-resin-with-distinctive-double-pore-structure
#5
Guqing Xiao, Ruiming Wen, Aijiao Liu, Guowen He, Dan Wu
Two approaches were used to synthesize two resins with different pore structures. In one way, the CH2Cl groups in macroporous chloromethylated polystyrene resin were transformed to methylene bridges, and achieved a hypercrosslinked resin with plentiful micropores (denoted GQ-06). In the other way, 50% of the CH2Cl groups in chloromethylated polystyrene resin was used to produce micropores, while the residual 50% of the CH2Cl groups was reacted with 2-aminopyridine, and prepared another resin with double pore structure of hypercrosslinked resin and macroporous resin (denoted GQ-11)...
January 22, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28109126/a-step-wise-approach-to-define-binding-mechanisms-of-surrogate-viral-particles-to-multi-modal-anion-exchange-resin-in-a-single-solute-system
#6
Matthew Brown, Sarah Johnson, Kurt Brorson, Scott Lute, David Roush
Multi-modal anion exchange resins combine properties of both anion exchange and hydrophobic interaction chromatography for commercial protein polishing and may provide some viral clearance as well. From a regulatory viral clearance claim standpoint, it is unclear if multi-modal resins are truly orthogonal to either single-mode anion exchange or hydrophobic interaction columns. To answer this, a strategy of solute surface assays and High Throughput Screening of resin in concert with a scale-down model of large scale chromatography purification was employed to determine the predominant binding mechanisms of a panel of bacteriophage (i...
January 21, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28105864/expression-and-purification-of-l-asparaginase-from-escherichia-coli-and-the-inhibitory-effects-of-cyclic-dipeptides
#7
Yanan Zhang, Dan Li, Yan Li
L-asparaginase, a key enzyme involved in nitrogen metabolism, is an effective anti-tumour agent. Cyclic dipeptides, a group of compounds, contain several important biological functions. In this paper, we proposed a novel method for L-asparaginase expression and purification from Echerichia coli and determined the effect of cyclic dipeptides on the enzymatic activity of recombinant L-asparaginase. The gene ansB encoding L-asparaginase was amplified from the genome of E. coli BL21 (DE3) by polymerase chain reaction and sub-cloned into pET-15b vector to construct expressing plasmid pET-15b-ansB...
January 20, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28100119/distribution-of-saccharides-and-salts-on-amphoteric-ion-exchange-resin
#8
Yuki Sha, Ayako Hasegawa, Utano Aimoto, Shuji Adachi
An amphoteric ion-exchange resin hardly shrank in 550 and 300 g/L glucose and sodium chloride solutions, respectively; however, the bed packed with a cation-exchange resin shrank considerably. From the distribution coefficients of some saccharides, the swelling pressure of the amphoteric ion-exchange resin was estimated to be 2.0 MPa at 25 °C. The distribution coefficients of glucose, galactose, fructose, and mannose were independent of their concentration and were about 0.621. On the other hand, the apparent distribution coefficients of NaF, NaCl, NaBr, NaI, LiCl, KCl, and CsCl largely depended on concentration...
January 19, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28087056/extraction-chromatographic-separations-of-tantalum-and-tungsten-from-hafnium-and-complex-matrix-constituents
#9
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...
February 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28063313/desulfurization-critical-step-towards-enhanced-selenium-removal-from-industrial-effluents
#10
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...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28040870/innovative-methods-to-generate-clean-sugar-stream-from-biomass-feedstocks-for-efficient-fermentation
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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