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ion exchange resin

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https://www.readbyqxmd.com/read/29433080/the-impact-of-loading-approach-and-biological-activity-on-nom-removal-by-ion-exchange-resins
#1
Joerg Winter, Heather E Wray, Martin Schulz, Roman Vortisch, Benoit Barbeau, Pierre R Bérubé
The present study investigated the impact of different loading approaches and microbial activity on the Natural Organic Matter (NOM) removal efficiency and capacity of ion exchange resins. Gaining further knowledge on the impact of loading approaches is of relevance because laboratory-scale multiple loading tests (MLTs) have been introduced as a simpler and faster alternative to column tests for predicting the performance of IEX, but only anecdotal evidence exists to support their ability to forecast contaminant removal and runtime until breakthrough of IEX systems...
February 9, 2018: Water Research
https://www.readbyqxmd.com/read/29425448/design-of-carrageenan-based-heparin-mimetic-gel-beads-as-self-anticoagulant-hemoperfusion-adsorbents
#2
Xin Song, Kang Wang, Cheng-Qiang Tang, Wen-Wen Yang, Weifeng Zhao, Changsheng Zhao
The currently used hemoperfusion adsorbents such as activated carbon and ion exchange resin show dissatisfactory hemocompatibility, and a large dose of injected heparin leads to the increasing cost and the risk of systematic bleeding. Natural polysaccharide adsorbents commonly have good biocompatibility, but their application is restricted by the poor mechanical strength and low content of functional groups. Herein, we developed an efficient, self-anticoagulant and blood compatible hemoperfusion adsorbent by imitating the structure and functional groups of heparin...
February 9, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29422194/ultrahigh-selective-adsorption-of-zwitterionic-ppcps-both-in-the-absence-and-presence-of-humic-acid-performance-and-mechanism
#3
Jing Jin, Tianyu Feng, Rui Gao, Yan Ma, Wei Wang, Qing Zhou, Aimin Li
Since zwitterionic PPCPs could be combined with humic acid (HA) leading to certain contaminants residue in aqueous solution, adsorbents with much stronger binding with zwitterionic PPCPs were needed to avoid this phenomenon. Through comparison of serial magnetic carboxyl modified hypercrosslinked resins including MA10, MA30, MA40 and MA70, MA50 was found to exhibit ultrahigh selective adsorption of zwitterionic PPCPs including tetracycline and quinolone antibiotics due to the remarkable synergistic effects generated from cation exchange interaction and non-ion exchange interaction...
April 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29407648/development-of-nanoscale-zirconium-molybdate-embedded-anion-exchange-resin-for-selective-removal-of-phosphate
#4
Trung Huu Bui, Sung Pil Hong, Jeyong Yoon
Development of a selective adsorbent with an enhanced removal efficiency for phosphate from wastewater is urgently needed. Here, a hybrid adsorbent of nanoscale zirconium molybdate embedded in a macroporous anion exchange resin (ZMAE) is proposed for the selective removal of phosphate. The ZMAE consists of a low agglomeration of zirconium molybdate nanoparticles (ZM NPs) dispersed within the structure of the anion exchange (AE) resin. As major results, the phosphate adsorption capacity of the ZMAE (26.1 mg-P/g) in the presence of excess sulfate (5 mM) is superior to that of the pristine AE resin (1...
February 1, 2018: Water Research
https://www.readbyqxmd.com/read/29404045/taste-masking-of-ofloxacin-and-formation-of-interpenetrating-polymer-network-beads-for-sustained-release
#5
A Michael Rajesh, Kiritkumar Mangaldas Popat
The objective of this study was to carry out taste masking of ofloxacin (Ofl) by ion exchange resins (IERs) followed by sustained release of Ofl by forming interpenetrating polymer network (IPN) beads. Drug-resin complexes (DRCs) with three different ratios of Ofl to IERs (1:1, 1:2, 1:4) were prepared by batch method and investigated for in vivo and in vitro taste masking. DRC of methacrylic acid-divinyl benzene (MD) resin and Ofl prepared at a ratio of 1:4 was used to form IPN beads. IPN beads of MD 1:4 were prepared by following the ionic cross-linking method using sodium carboxymethyl xanthan gum (SCMXG) and SCMXG-sodium carboxymethyl cellulose (SCMXG-SCMC)...
August 2017: Journal of Pharmaceutical Analysis
https://www.readbyqxmd.com/read/29396990/determination-of-the-speciation-and-bioavailability-of-sm-to-chlamydomonas-reinhardtii-in-the-presence-of-natural-organic-matter
#6
Justine-Anne Rowell, Marc-Alexandre Fillion, Scott Smith, Kevin J Wilkinson
As technological interest and environmental emissions of the rare earth elements (REE) increase, it is becoming more important to assess their potential environmental impact. Samarium (Sm) is a lanthanide of intermediate molar mass that is used in numerous high technology applications including wind turbines, solar panels and electric vehicles. The present study relates the speciation of samarium (Sm) determined in the presence of natural organic matter (NOM) to its bioavailability to the unicellular green alga, Chlamydomonas reinhardtii...
February 3, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29384362/enhanced-electrochemical-stability-of-a-zwitterionic-polymer-functionalized-electrode-for-capacitive-deionization
#7
Youngsuk Jung, Yooseong Yang, Taeyoon Kim, Hyun Suk Shin, Sunghoon Hong, Sungmin Cha, Soonchul Kwon
In capacitive deionization, the salt-adsorption capacity of the electrode is critical for efficient hard water desalination. To improve the water-deionization capacity, the carbon electrode surface can be modified with ion-exchange resins. Herein, we introduce the encapsulation of zwitterionic polymers over activated carbon to provide a resistant barrier that stabilizes the structure of electrode during electrochemical performance and enhances the capacitive deionization efficiency. Compared to conventional activated carbon, the surface-modified activated carbon exhibits significantly enhanced capacitive deionization, with a minimum conductivity of ~43 μS/cm...
January 31, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29378261/improving-the-quality-of-a-recombinant-rabbit-monoclonal-antibody-against-plxdc2-by-optimizing-transient-expression-conditions-and-purification-method
#8
Hisayo Shimizu, Masataka Nakagawa, Nemuri Todaka, Keitaro Imaizumi, Yasunori Kurosawa, Toshiaki Maruyama, C J Okumura, Takashi Shibata, Yosuke Tanaka, Yoshinori Sato, Yasuo Ono, Teruo Akuta
Rabbit monoclonal antibodies (mAbs) have many advantages over mouse antibodies in biological research and diagnostics applications because they exhibit high affinity and specificity. However, the methods of recombinant rabbit mAb production have not been optimized to the same extent as techniques used to produce mouse and human mAbs. In this study, we sought to optimize the production of a recombinant rabbit mAb against human plexin domain containing protein 2 (PLXDC2), a known cell surface antigen, by culturing HEK293-6E cells transfected with antibody-encoding genes at two different temperatures and by purifying the end-product by three different chromatography methods...
January 26, 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29376346/synthesis-of-prebiotic-caramels-catalyzed-by-ion-exchange-resin-particles-kinetic-model-for-the-formation-of-di-d-fructose-dianhydrides
#9
Imelda-Elizabeth Ortiz Cerda, Phahath Thammavong, Vincent Caqueret, Catherine Porte, Isabelle Mabille, José Manuel García Fernández, Mario Moscosa Santillan, Jean-Louis Havet
Caramel enriched in di-D-fructose dianhydrides (DFAs, a family of prebiotic cyclic fructodisaccharides) is a functional food with beneficial properties for health. The aim of this work was to study the conversion of fructose into DFAs catalyzed by acid ion-exchange resin, in order to establish a simplified mechanism of the caramelization reaction and a kinetic model for DFA formation. Batch reactor experiments were carried out in a 250 mL spherical glass flask and afforded up to 50%DFA yields. The mechanism proposed entails order 2 reactions that describe fructose conversion on DFAs or formation of by-products such as HMF or melanoidins...
January 27, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29329813/effects-of-metal-ions-in-tea-polysaccharides-on-their-in-vitro-antioxidant-activity-and-hypoglycemic-activity
#10
Minghao Fan, Xun Sun, Yilin Qian, Ying Xu, Dongfeng Wang, Yanping Cao
Total tea polysaccharides (TTPS) were extracted from two kinds of pruning leaves of tea plant and fractionated into neutral tea polysaccharides (TPSI) and acidic tea polysaccharides (TPSII) by anion exchange resin D315. Some physicochemical properties, including structure, monosaccharide composition, and molecular weight distribution, as well as the 4 in vitro antioxidant activities and inhibitory effects on α-glucosidase of above polysaccharides before and after removing metal ions were investigated. By comparing TTPS and TPSII, we found that they exhibited different antioxidant activities and inhibitory actions against α-glucosidase after their metal ions were removed...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29326277/%C3%A2-patiromer-for-the-management-of-hyperkalaemia
#11
(no author information available yet)
Hyperkalaemia is a potentially life-threatening condition, in which there is an abnormally high concentration of potassium ions in the blood.1,2 Cation-exchange resins (e.g. calcium or sodium polystyrene sulfonate) that bind potassium in the gastrointestinal tract to increase faecal elimination have been used as part of the management of hyperkalaemia but they have some serious adverse effects, including potentially fatal gastrointestinal necrosis.3,4 Patiromer (▼Veltassa - Vifor Fresenius) is a cation-exchange polymer that is licensed for the treatment of hyperkalaemia in adults and, unlike other exchange resins, its licence is not restricted to people with anuria, severe oliguria or those requiring or undergoing dialysis...
January 2018: Drug and Therapeutics Bulletin
https://www.readbyqxmd.com/read/29322862/feasibility-of-developing-a-passive-sampler-for-sampling-heavy-metals-in-bmps-for-stormwater-runoff-management
#12
Yueqin Dou, Mitch Klein, Tian C Zhang, John Stansbury, Massoum Moussavi, Dana L Richter-Egger, Jing Zeng
Structural Best Management Practices (BMPs) have been used for stormwater treatment and management for several decades. How to monitor these BMPs performance reliably and economically is a challenge. This paper reports feasibility of developing a flow through passive sampler (PS) based on Amberlite IRC748 ion exchange resin operated in kinetic regime for sampling heavy metals in BMPs (infiltration systems) for stormwater treatment and management. Tests were conducted using batch reactors and laboratory-scale BMPs (bioretention cells)...
January 11, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29321412/the-successful-treatment-of-sodium-polystyrene-sulfonate-induced-enteritis-diagnosed-by-small-bowel-endoscopy
#13
Kohei Okayama, Yoshikazu Hirata, Daisuke Kumai, Yuki Yamamoto, Yuki Kojima, Takuya Kanno, Hirokazu Ikeuchi, Hisato Mochizuki, Hiroki Takada, Satoshi Sobue
Sodium polystyrene sulfonate (SPS: Kayexalate®) is an ion-exchange resin used to treat hyperkalemia in patients with chronic kidney disease. It is known that this resin sometimes causes colonic necrosis and perforation, but there are few reports about small bowel necrosis associated with SPS. We herein report the case of a patient who developed SPS-induced small bowel necrosis, which was diagnosed based on the examination of a small bowel endoscopic biopsy specimen. The SPS-induced small bowel necrosis was resistant to conservative treatment including the cessation of SPS, and finally required surgical bowel resection...
January 11, 2018: Internal Medicine
https://www.readbyqxmd.com/read/29286243/effects-of-resin-architecture-and-protein-size-on-nanoscale-protein-distribution-in-ion-exchange-media
#14
Stijn H S Koshari, Norman J Wagner, Abraham M Lenhoff
Knowledge of the nanoscale distribution of proteins in chromatographic resins is critical to our mechanistic understanding of separations performance. However, the nano- to mesoscale architecture of these materials is challenging to characterize using conventional techniques. Small-angle neutron scattering was used to probe (1) the nano- to mesoscale structure of chromatographic media and (2) protein sorption in these media in situ with protein-scale resolution. In particular, we characterize the effect of the architecture of cellulose-based and traditional and dextran-modified agarose-based ion-exchange resins on the nanoscale distribution of a relatively small protein (lysozyme) and two larger proteins (lactoferrin and a monoclonal antibody) at different protein loadings...
December 29, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29276111/efficient-detoxification-of-corn-cob-hydrolysate-with-ion-exchange-resins-for-enhanced-xylitol-production-by-candida-tropicalis-mtcc-6192
#15
Vinod Kumar, Meena Krishania, Pankaj Preet Sandhu, Vivek Ahluwalia, Edgard Gnansounou, Rajender S Sangwan
The present study demonstrates utilization of secondary agricultural wastes for xylitol production. The highest xylan-to-xylose (70%) conversion was achieved using dilute nitric acid as catalyst followed by resin treatment. Results show that resin treatment efficiently removed nitrate salt (70%), phenolic content and 5-HMF (70%). Highest xylitol yield (85%) was achieved during fermentation using Candida tropicalis MTCC 6192 from the neutralized hemicellulosic hydrolysate medium. Good recovery (>15%) was achieved from corncob with 85% xylose to xylitol conversion during fermentation...
December 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29274557/zif-67-supported-on-marcoscale-resin-as-an-efficient-and-convenient-heterogeneous-catalyst-for-oxone-activation
#16
Chang-Hsun Wu, Wan-Chu Yun, Thomas Wi-Afedzi, Kun-Yi Andrew Lin
While metal organic frameworks (MOFs) are promising catalysts for aqueous chemical oxidation, MOFs are typically prepared to be nanoscale and thus less practical for solution-based reactions. Although a few attempts have developed substrate-supported MOFs, many of them are still small and none of them are developed for sulfate-radical based chemical oxidation. However, there is still an urgent demand for developing substrate-supported MOFs which are catalytically effective, conveniently prepared, and simply recyclable...
November 26, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29213186/cyclic-fractionation-process-for-saccharina-latissima-using-aqueous-chelator-and-ion-exchange-resin
#17
Martin Sterner, Mauricio Sodré Ribeiro, Fredrik Gröndahl, Ulrica Edlund
A new approach to process Saccharina latissima algal biomass was developed using sodium citrate and a polyvalent cation-specific resin to sequentially extract the alginate into several usable fractions. The fractionation was performed in a cyclic manner, utilizing a stepwise removal of the native polyvalent ions present in the algae to isolate fractions of alginate with different solubility in the presence of these ions. Sodium citrate was used in different concentrations in the extraction solution to remove polyvalent cations to adjust the alginate liberation while AMBERLITE IRC718 resin was added to further remove these ions and regenerate the extraction solution...
2017: Journal of Applied Phycology
https://www.readbyqxmd.com/read/29213069/preparation-of-permanent-magnetic-resin-crosslinking-by-diallyl-itaconate-and-its-adsorptive-and-anti-fouling-behaviors-for-humic-acid-removal
#18
Qimeng Li, Ji Wu, Ming Hua, Guang Zhang, Wentao Li, Chendong Shuang, Aimin Li
In this research, a series of permanent magnetic anion exchange resins (MAERs) were prepared by polymerizing glycidyl methacrylate monomer and crosslinking diallyl itaconate (DAI) and divinylbenzene. The properties and performances of these novel MAERs were systematically characterized and evaluated for humic acid (HA) adsorption by batch experiments. With the increase of DAI content from 0 to 15%, the moisture of MAERs was elevated from 50.23% to 68.53%, along with the adsorption capacity increasing from 2...
December 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29200711/biological-activities-and-cytotoxicity-of-eperua-oleifera-ducke-oil-resin
#19
Fernanda Torlania Alves Gomes, Ana Paula de Araújo Boleti, Lidiam M Leandro, Diego Squinello, Ellen S P Aranha, Marne C Vasconcelos, Paul Cos, Valdir F Veiga-Junior, Emerson Silva Lima
Background: The oil-resin of Eperua oleifera Ducke has been used in popular medicine similarly to the copaiba oil (Copaifera spp.). Objective: This study aimed to investigate the effects of the acid fraction of E. oleifera oil-resin (AFEOR) on cell proliferation, collagen production in human fibroblasts, inhibition of metalloproteinases, and cytotoxicity against tumor cell lines. Materials and Methods: Acid fraction of E. oleifera was fractionated in the ion exchange column chromatography...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29195216/photo-induced-toxicity-of-tungsten-oxide-photochromic-nanoparticles
#20
A L Popov, N M Zholobak, O I Balko, O B Balko, A B Shcherbakov, N R Popova, O S Ivanova, A E Baranchikov, V K Ivanov
We synthesised a new type of photochromic tungsten oxide nanoparticles, analysed their photocatalytic activity and carried out a thorough analysis of their effect on prokaryotic and eukaryotic organisms. Ultrasmall hydrated tungsten oxide nanoparticles were prepared by means of hydrothermal treatment of tungstic acid in the presence of polyvinylpyrrolidone as a template, stabiliser and growth regulator. Tungstic acid was synthesised through an ion-exchange method using sodium tungstate solution and a strongly acidic cation exchange resin...
November 20, 2017: Journal of Photochemistry and Photobiology. B, Biology
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