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ion exchange resin

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https://www.readbyqxmd.com/read/29040854/simultaneously-separation-of-xylo-oligosaccharide-and-lignosulfonate-from-wheat-straw-magnesium-bisulfite-pretreatment-spent-liquor-using-ion-exchange-resin
#1
Lei Liu, Jiwei Ren, Yitong Zhang, Xinlu Liu, Jia Ouyang
For wheat straw, an ideal bio-refinery process is that all three major components of biomass could be efficiently utilized to make high value chemicals, MBSP could directly convert the hemicelluloses and lignin into xylo-oligosaccharides and lignosulfonate. However, these value-added compounds still present in spent liquor and thus should be isolated as an individual product. In present work, a simple and efficient ion exchange process was developed for separating xylo-oligosaccharides and lignosulfonate simultaneously from spent liquor...
October 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28990530/isoform-separation-by-a-mixed-mode-resin-toyopearl-mx-trp-650m
#2
Tsutomu Arakawa
TOYOPEARL particles are cross-linked hydroxylated methacrylic polymers available in different pore and particle sizes. They are conjugated with different ligands to generate ion-exchange, hydrophobic interaction and affinity resins. They have excellent physical and chemical properties. A mixed-mode resin, TOYOPEARL MX-Trp-650M, is made of this particle with tryptophan conjugated via N-terminal amino group and hence has both hydrophobic/aromatic side chain and carboxyl group. In this review, I will summarize the properties of the TOYOPEARL particles and MX-Trp-650M resin and application of this resin for purification of proteins and in some detail the separation of disulfide (SS)-scrambled oligomers of insulin-like growth factor-1 (IGF-1)...
October 9, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28988306/nanoscale-wide-band-semiconductors-for-photocatalytic-remediation-of-aquatic-pollution
#3
Biplab Sarkar, Akshay Vishnu Daware, Priya Gupta, Kishore Kumar Krishnani, Sunandan Baruah, Surajit Bhattacharjee
Water pollution is a serious challenge to the public health. Among different forms of aquatic pollutants, chemical and biological agents create paramount threat to water quality when the safety standards are surpassed. There are many conventional remediatory strategies that are practiced such as resin-based exchanger and activated charcoal/carbon andreverse osmosis. Newer technologies using plants, microorganisms, genetic engineering, and enzyme-based approaches are also proposed for aquatic pollution management...
October 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28971358/preparation-and-evaluation-of-taste-masking-iron-suspension-taking-advantage-of-weak-cationic-exchange-resin
#4
Maryam Kouchak, Zahra Ramezani, Farid Bagheri
The objective of this study is to use weak acid cation exchange resin to mask the taste and eliminate the teeth staining problems of ferrous sulfate liquid preparations for use in pediatrics. Amberlite IPR64 was loaded by Fe(II). Then, different suspensions of the iron-resin complex were prepared using various polymers as the suspending agents, and sorbitol as well as sucrose as sweeteners. Physical stability, rheological assessment, kinetics of Fe(II) release, and taste evaluation of suspensions were studied...
October 2, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28965031/utilizing-ion-exchange-resin-to-improve-recovery-from-organic-shock-loading-in-an-anmbr-treating-sewage-sludge
#5
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...
September 21, 2017: Water Research
https://www.readbyqxmd.com/read/28948786/life-cycle-cost-and-environmental-assessment-of-decentralized-nitrogen-recovery-using-ion-exchange-from-source-separated-urine-through-spatial-modeling
#6
Olga Kavvada, William A Tarpeh, Arpad Horvath, Kara L Nelson
Nitrogen standards for discharge of wastewater effluent into aquatic bodies are becoming more stringent, requiring some treatment plants to reduce effluent nitrogen concentrations. This study aimed to assess, from a life-cycle perspective, an innovative decentralized approach to nitrogen recovery: ion exchange of source-separated urine. We modeled an approach in which nitrogen from urine at individual buildings is sorbed onto resins, then transported by truck to regeneration and fertilizer production facilities...
October 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28923588/development-of-silver-nanoparticle-doped-adsorbents-for-the-separation-and-recovery-of-radioactive-iodine-from-alkaline-solutions
#7
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/28906442/the-role-of-ion-exchange-membranes-in-membrane-capacitive-deionisation
#8
REVIEW
Armineh Hassanvand, Kajia Wei, Sahar Talebi, George Q Chen, Sandra E Kentish
Ion-exchange membranes (IEMs) are unique in combining the electrochemical properties of ion exchange resins and the permeability of a membrane. They are being used widely to treat industrial effluents, and in seawater and brackish water desalination. Membrane Capacitive Deionisation (MCDI) is an emerging, energy efficient technology for brackish water desalination in which these ion-exchange membranes act as selective gates allowing the transport of counter-ions toward carbon electrodes. This article provides a summary of recent developments in the preparation, characterization, and performance of ion exchange membranes in the MCDI field...
September 14, 2017: Membranes
https://www.readbyqxmd.com/read/28892742/toxicity-teratogenicity-and-antibacterial-activity-of-posterior-salivary-gland-psg-toxin-from-the-cuttlefish-sepia-pharaonis-ehrenberg-1831
#9
Ramachandran Karthik, Venkatesan Manigandan, Ramachandran Saravanan
Toxins from the posterior salivary gland (PSG) of cuttlefishes are known toxins with pronounced toxicity. In the present study, ionic peptide rich PSG toxin from the cuttlefish S. pharaonis was isolated by ion exchange chromatography and purified by Reversed Phase High Performance Liquid Chromatography (RP-HPLC), with active fraction at a retention time of 26min. The net protein content of the PSG toxin was estimated to be 46.6mg at a proximate molecular weight of∼50kDa. Fourier Transform Infrared Spectroscopy (FT-IR) of PSG toxin revealed the presence of alcoholic OH, primary NH, alkyl CH and conjugated CONH functional groups...
October 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28876501/aqueous-voltammetry-in-the-near-absence-of-electrolyte
#10
Xiuting Li, Christopher Batchelor-McAuley, Eduardo Laborda, Richard G Compton
In order to minimize the incidence of the CO2 hydrolysis and conduct aqueous electrochemistry in the virtual absence of electrolyte, a novel methodology is developed to achieve the near minimum conductivity (~60 nS cm-1) for an aqueous solution through in-situ deionization with ion exchange resin beads. Aqueous electrochemistry studying the oxidations of platinum, ferrocenemethanol and hydrogen (H2) were conducted in the near complete absence of trace ionic species at a platinum microelectrode (d = 10 um). Both surface and solution phase electrochemical reactions were clearly observed, indicating that under these conditions there is a sufficiently compressed double layer for an interfacial electron transfer to be driven and the iR effects are significantly smaller than theoretically expected...
September 6, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28873611/a-galactomannoglucan-derived-from-agaricus-brasiliensis-purification-characterization-and-macrophage-activation-via-mapk-and-i%C3%AE%C2%BAb-nf%C3%AE%C2%BAb-pathways
#11
Yanqing Zhang, Danting Liu, Leilei Fang, Xiaotong Zhao, Aimin Zhou, Junbo Xie
In this study, a novel galactomannoglucan named as TJ2 was isolated from Agaricus brasiliensis with microwave extraction, macroporous resin, ion exchange resin and high resolution gel chromatography. TJ2 is composed of glucose, mannose and galactose in the ratio 99.2:0.2:0.6. Infrared spectra (IR), methylation analysis and nuclear magnetic resonance spectra indicated that TJ2 mainly contained a β-(1→3) - linked glucopyranosyl backbone. Interestingly, TJ2 significantly promoted RAW264.7 cell proliferation, and was able to activate the cells to engulf E...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28869054/onsite-defluoridation-system-for-drinking-water-treatment-using-calcium-carbonate
#12
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/28865682/purification-of-trypanosoma-cruzi-metacyclic-trypomastigotes-by-ion-exchange-chromatography-in-sepharose-deae-a-novel-methodology-for-host-pathogen-interaction-studies
#13
Lissa Cruz-Saavedra, Marina Muñoz, Cielo León, Manuel Alfonso Patarroyo, Gabriela Arevalo, Paula Pavia, Gustavo Vallejo, Julio César Carranza, Juan David Ramírez
Metacyclic trypomastigotes are essential for the understanding of the biology of Trypanosoma cruzi, the agent of Chagas disease. However, obtaining these biological stages in axenic medium is difficult. Techniques based on charge and density of the parasite during different stages have been implemented, without showing a high efficiency in the purification of metacyclic trypomastigotes. So far, there is no protocol implemented where sepharose-DEAE is used as a resin. Therefore, herein we tested its ability to purify metacyclic trypomastigotes in Liver Infusion Triptose (LIT) medium cultures...
November 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28844388/cation-exchange-assisted-binding-elution-strategy-for-enzymatic-synthesis-of-human-milk-oligosaccharides-hmos
#14
Hailiang Zhu, Zhigang Wu, Madhusudhan Reddy Gadi, Shuaishuai Wang, Yuxi Guo, Garrett Edmunds, Wanyi Guan, Junqiang Fang
A cation exchange assisted binding-elution (BE) strategy for enzymatic synthesis of human milk oligosaccharides (HMOs) was developed. An amino linker was used to provide the cation ion under acidic condition which can be readily bound to cation exchange resin and then eluted off by saturated ammonium bicarbonate. Ammonium bicarbonate in the collections was easily removed by vacuum evaporation. This strategy circumvented the incompatible issue between glycosyltransferases and solid support or large polymers, and no purification was needed for intermediate products...
September 15, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28841986/indirect-determination-of-pentaerythritol-tetranitrate-petn-with-a-gold-nanoparticles-based-colorimetric-sensor
#15
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
#16
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...
August 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28806598/automated-synthesis-of-1-11-c-acetoacetate-on-a-trasis-aio-module
#17
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
https://www.readbyqxmd.com/read/28796828/acid-free-glyoxal-as-a-substitute-of-formalin-for-structural-and-molecular-preservation-in-tissue-samples
#18
Gianni Bussolati, Laura Annaratone, Enrico Berrino, Umberto Miglio, Mara Panero, Marco Cupo, Patrizia Gugliotta, Tiziana Venesio, Anna Sapino, Caterina Marchiò
Tissue fixation in phosphate buffered formalin (PBF) remains the standard procedure in histopathology, since it results in an optimal structural, antigenic and molecular preservation that justifies the pivotal role presently played by diagnoses on PBF-fixed tissues in precision medicine. However, toxicity of formaldehyde causes an environmental concern and may demand substitution of this reagent. Having observed that the reported drawbacks of commercially available glyoxal substitutes of PBF (Prefer, Glyo-fix, Histo-Fix, Histo-CHOICE, and Safe-Fix II) are likely related to their acidity, we have devised a neutral fixative, obtained by removing acids from the dialdehyde glyoxal with an ion-exchange resin...
2017: PloS One
https://www.readbyqxmd.com/read/28772808/production-of-high-purity-anhydrous-nickel-ii-perrhenate-for-tungsten-based-sintered-heavy-alloys
#19
Katarzyna Leszczyńska-Sejda, Grzegorz Benke, Dorota Kopyto, Tomasz Majewski, Michał Drzazga
This paper presents a method for the production of high-purity anhydrous nickel(II) perrhenate. The method comprises sorption of nickel(II) ions from aqueous nickel(II) nitrate solutions, using strongly acidic C160 cation exchange resin, and subsequent elution of sorbed nickel(II) ions using concentrated perrhenic acid solutions. After the neutralization of the resulting rhenium-nickel solutions, hydrated nickel(II) perrhenate is then separated and then dried at 160 °C to obtain the anhydrous form. The resulting compound is reduced in an atmosphere of dissociated ammonia in order to produce a Re-Ni alloy powder...
April 24, 2017: Materials
https://www.readbyqxmd.com/read/28764325/anion-exchange-fibers-for-improved-sample-loading-in-ultra-trace-analysis-of-plutonium-by-thermal-ionization-mass-spectrometry
#20
Joseph M Mannion, Charles R Shick, Glenn A Fugate, Brian A Powell, Scott M Husson
A new sample loading procedure was developed for isotope ratio measurements of ultratrace amounts of plutonium with thermal ionization mass spectrometry (TIMS). The goal was to determine the efficacy of a polymer fiber architecture for TIMS sample loading by following similar sample loading procedures as those used in bead loading. Fibers with diameter of approximately 100 μm were prepared from triethylamine-quaternized-poly(vinylbenzyl chloride) cross-linked with diazabicyclo[2.2.2]octane. Fiber sections (2...
September 5, 2017: Analytical Chemistry
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