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Anion exchange resin

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https://www.readbyqxmd.com/read/29329813/effects-of-metal-ions-in-tea-polysaccharides-on-their-in-vitro-antioxidant-activity-and-hypoglycemic-activity
#1
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/29311435/preparative-separation-of-high-purity-dihydroartemisinic-acid-from-artemisinin-production-waste-by-combined-chromatography
#2
Shuoqian Liu, Jorge Freire da Silva Ferreira, Dongming Tian, Yuwei Tang, Liping Liu, Wei Yang, Zhonghua Liu, Na Tian
In order to make full use of artemisinin production waste and thus to reduce the production cost of artemisinin, we developed an efficient and scalable method to isolate high-purity dihydroartemisinic acid from artemisinin production waste by combining anion-exchange resin with silica-gel column chromatography. The adsorption and desorption characteristics of dihydroartemisinic acid on 10 types of anion-exchange resin were investigated, and the results showed that the 717 anion-exchange resin exhibited the highest capacity of adsorption and desorption to dihydroartemisinic acid...
December 28, 2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29310856/chemoenzymatic-synthesis-of-sucuronic-acid-using-d-glucurono-6-3-lactone-and-sucrose-as-raw-materials-and-properties-of-the-product
#3
Hiroki Hosaka, Saori Mizoguchi, Mitsuru Tashiro, Takashi Fujimoto, Takako Hirano, Wataru Hakamata, Toshiyuki Nishio
Using d-glucurono-6,3-lactone (GlcL) and sucrose (Suc) as raw materials, we synthesized sucuronic acid (SucA), in which the d-glucose (Glc) residue of Suc was replaced with d-glucuronic acid, by a three-step chemoenzymatic method. In the 1st chemical step, methyl d-glucuronate (GlcAM) was synthesized by treating GlcL with a strong base anion exchange resin, Amberlite IRA402BL OH AG, in anhydrous methanol. In the 2nd step, which included an enzyme reaction, methyl sucuronate (SucAM) was synthesized from GlcAM and fructose by exploiting the transfructosylation activity of the Microbacterium saccharophilum K-1 β-fructofuranosidase, a reaction that is suppressed in the presence of high-concentration Glc...
March 2018: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/29305937/of-mice-and-men-traces-of-life-in-the-death-registries-of-the-1630-plague-in-milano
#4
Alfonsina D'Amato, Gleb Zilberstein, Svetlana Zilberstein, Benedetto Luigi Compagnoni, Pier Giorgio Righetti
The death registries of the plague epidemic of 1630, stored at the Archivio di Stato of Milano, have been interrogated via the EVA film technology (ethyl vinyl acetate film studded with crushed strong anion and cation exchangers as well as C8 resins). The EVA diskettes have been left in contact with the lower right margins of 11 different pages pertaining to the peak months of the raging disease (June through end of September) for 60-90min and then the captured material, after elution and digestion, analysed by mass spectrometry...
January 3, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29278725/evaluating-the-effect-of-in-process-material-on-the-binding-mechanisms-of-surrogate-viral-particles-to-a-multi-modal-anion-exchange-resin
#5
Matthew R Brown, Michael S Burnham, Sarah A Johnson, Scott C Lute, Kurt A Brorson, David J Roush
Bacteriophage binding mechanisms to multi-modal anion exchange resin may include both anion exchange and hydrophobic interactions, or the mechanism can be dominated by a single moiety. However, previous studies have reported binding mechanisms defined for simple solutions containing only buffer and a surrogate viral spike (i.e. bacteriophage ΦX174, PR772, and PP7). We employed phage spiked in-process monoclonal antibody (mAb) pools to model binding under bioprocessing conditions. These experiments allow the individual contributions of the mAb, in-process impurities, and buffer composition on mechanistic removal of phages to be studied...
December 23, 2017: Journal of Biotechnology
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
#6
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/29181600/strategies-for-improving-production-performance-of-probiotic-pediococcus-acidilactici-viable-cell-by-overcoming-lactic-acid-inhibition
#7
Majdiah Othman, Arbakariya B Ariff, Helmi Wasoh, Mohd Rizal Kapri, Murni Halim
Lactic acid bacteria are industrially important microorganisms recognized for fermentative ability mostly in their probiotic benefits as well as lactic acid production for various applications. Fermentation conditions such as concentration of initial glucose in the culture, concentration of lactic acid accumulated in the culture, types of pH control strategy, types of aeration mode and different agitation speed had influenced the cultivation performance of batch fermentation of Pediococcus acidilactici. The maximum viable cell concentration obtained in constant fed-batch fermentation at a feeding rate of 0...
November 27, 2017: AMB Express
https://www.readbyqxmd.com/read/29128590/synthesis-and-characterization-of-a-new-soluble-soybean-polysaccharide-iron-iii-complex-using-ion-exchange-column
#8
Wenhong Gao, Yangping Huang, Ruixue He, Xin-An Zeng
A new ion exchange column method was investigated to synthesize the soluble soybean polysaccharide-iron(III) complex (SSPS-FeIII(1)) using soluble soybean polysaccharides (SSPS). The feasibility of ion exchange column reaction was explored firstly. Results indicated the D730 anion macroporous adsorption resin could effectively absorb SSPS and the static adsorption saturation time was 20h. The iron content of the complex reached up to 15.07% when trisodium citrate concentration was 2mg/mL. The structure of SSPS-FeIII complex synthesized by this method (SSPS-FeIII1(2)) was compared with that prepared by trisodium citrate - ferric chloride method (SSPS-FeIII2(3))...
November 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29100119/simultaneous-uptake-of-nom-and-microcystin-lr-by-anion-exchange-resins-effect-of-inorganic-ions-and-resin-regeneration
#9
Fuhar Dixit, Benoit Barbeau, Madjid Mohseni
This study investigated the efficiency of a strongly basic macroporous anion exchange resin for the co-removal of Microcystin-LR (MCLR) and natural organic matter (NOM) in waters affected by toxic algal blooms. Environmental factors influencing the uptake behavior included MCLR and resin concentrations, NOM and anionic species, specifically nitrate, sulphate and bicarbonate. A860 resin exhibited an excellent adsorption capacity of 3800 μg/g; more than 60% of the MCLR removal was achieved within 10 min with a resin dosage of 200 mg/L (∼1 mL/L)...
October 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/29096150/comparison-of-different-methodologies-for-the-90-sr-determination-in-environmental-samples
#10
Željko Grahek, Silvia Dulanská, Gorana Karanović, Ivana Coha, Ivana Tucaković, Marijana Nodilo, Ľubomír Mátel
The paper describes different isolation/separation and detection procedures for (90)Sr determination in the environmental samples which are routinely used in Laboratories A and B. In this context, four different methods for strontium isolation and two methods for detection were tested and compared by (90)Sr determination in proficiency test samples (water, soil, vegetation) and animal bone samples. The chromatographic isolation of Sr on Sr resin, AnaLig(®)Sr01 resin gel, strong base anion exchange resins in nitrate form and combination of strong base anion exchange and Sr resin were used for the examination of the impact of sample matrix constituents on efficiency of strontium isolation (chemical yield), while Cherenkov counting of (90)Y and counting of (90)Sr((90)Y) on proportional counter were used for the quantitative (90)Sr determination...
October 28, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29080819/isolation-purification-and-antioxidant-activity-of-polysaccharides-from-the-leaves-of-maca-lepidium-meyenii
#11
Kang Caicai, Hao Limin, Zhang Liming, Zheng Zhiqiang, Yang Yongwu
Two fractions of polysaccharides (MLP-1 and MLP-2) were extracted from the leaves of maca (Lepidium Meyenii Walp.) by water, and purified using DEAE-52 ion exchange resin and sephadex G-200 clumns chromatography. An investigation was carried out for their structural characterization and antioxidant activity in vitro. The results indicated that MLP-1 was mainly composed of ribose, rhamnose, arabinose, xylose, mannose, glucose and galactose, with the molar ratio of 0.12:0.32:1.50:0.32:1.03:1.00:0.93; the MLP-2 was a homopolysaccharide composed of glucose...
October 25, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29080542/effect-of-pore-structure-on-the-removal-of-clofibric-acid-by-magnetic-anion-exchange-resin
#12
Liang Tan, Chendong Shuang, Yunshu Wang, Jun Wang, Yihong Su, Aimin Li
The effect of pore structure of resin on clofibric acid (CA) adsorption behavior was investigated by using magnetic anion exchange resins (ND-1, ND-2, ND-3) with increasing pore diameter by 11.68, 15.37, 24.94 nm. Resin with larger pores showed faster adsorption rates and a higher adsorption capacity because the more opened tunnels provided by larger pores benefit the CA diffusion into the resin matrix. The ion exchange by the electrostatic interactions between Cl-type resin and CA resulted in chloride releasing to the solution, and the ratio of released chloride to CA adsorption amount decreased from 0...
October 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29078192/n-nitrosodimethylamine-ndma-and-its-precursors-in-water-and-wastewater-a-review-on-formation-and-removal
#13
REVIEW
Massimiliano Sgroi, Federico G A Vagliasindi, Shane A Snyder, Paolo Roccaro
This review summarizes major findings over the last decade related to N-Nitrosodimethylamine (NDMA) in water and wastewater. In particular, the review is focused on the removal of NDMA and of its precursors by conventional and advanced water and wastewater treatment processes. New information regarding formation mechanisms and precursors are discussed as well. NDMA precursors are generally of anthropogenic origin and their main source in water have been recognized to be wastewater discharges. Chloramination is the most common process that results in formation of NDMA during water and wastewater treatment...
October 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29075891/efficient-in-situ-separation-and-production-of-l-lactic-acid-by-bacillus-coagulans-using-weak-basic-anion-exchange-resin
#14
Yitong Zhang, Zijun Qian, Peng Liu, Lei Liu, Zhaojuan Zheng, Jia Ouyang
To get rid of the dependence on lactic acid neutralizer, a simple and economical approach for efficient in situ separation and production of L-lactic acid was established by Bacillus coagulans using weak basic anion-exchange resin. During ten tested resins, the 335 weak basic anion-exchange resins demonstrated the highest adsorption capacity and selectivity for lactic acid recovery. The adsorption study of the 335 resins for lactic acid confirmed that it is an efficient adsorbent under fermentation condition...
October 26, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28991211/determination-of-cadmium-in-brown-rice-samples-by-fluorescence-spectroscopy-using-a-fluoroionophore-after-purification-of-cadmium-by-anion-exchange-resin
#15
Akira Hafuka, Akiyoshi Takitani, Hiroko Suzuki, Takuya Iwabuchi, Masahiro Takahashi, Satoshi Okabe, Hisashi Satoh
Simple analytical methods are needed for determining the cadmium (Cd) content of brown rice samples. In the present study, we developed a new analytical procedure consisting of the digestion of rice using HCl, Cd purification using anion exchange resin, and then determining the Cd content using fluorescence spectroscopy. Digestion with 0.1 M HCl for 10 min at room temperature was sufficient to extract Cd from the ground rice samples. The Cd in the extract was successfully purified in preference to other metals using Dowex 1X8 chloride form resin...
October 9, 2017: Sensors
https://www.readbyqxmd.com/read/28965031/utilizing-ion-exchange-resin-to-improve-recovery-from-organic-shock-loading-in-an-anmbr-treating-sewage-sludge
#16
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...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/28950202/hot-rolling-sludge-incineration-suppression-of-pcdd-fs-by-spent-anion-exchange-resins
#17
Shuaixi Xu, Tong Chen, Mengmei Zhang, Alfons Buekens, Yongmei Yu, Yanyan Ling, Zhiliang Chen, Xiaodong Li
Steel industry is the main industrial source of 'dioxins', i.e. polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). These arise mainly in the off-gas from sintering plant, yet also other operations, such as continuous casting, and hot and cold rolling could generate albeit minor amounts of dioxins. In this contribution it is verified in how far the incineration of hot rolling sludge (HRS) could contribute to such emissions and, if so, how these could be suppressed at low cost. Spent anion exchange resin (SAER) appeared as a dioxins suppressant during combustion tests of hot rolling sludge in a bench-scale tubular furnace...
July 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28923588/development-of-silver-nanoparticle-doped-adsorbents-for-the-separation-and-recovery-of-radioactive-iodine-from-alkaline-solutions
#18
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/28916097/determination-of-99-tc-in-fresh-water-using-tru-resin-by-icp-ms
#19
Nicolas Guérin, Remi Riopel, Sheila Kramer-Tremblay, Nimal de Silva, Jack Cornett, Xiongxin Dai
Technetium-99 ((99)Tc) determination at trace level by inductively coupled plasma mass spectrometry (ICP-MS) is challenging because there is no readily available appropriate Tc isotopic tracer. A new method using Re as a recovery tracer to determine (99)Tc in fresh water samples, which does not require any evaporation step, was developed. Tc(VII) and Re(VII) were pre-concentrated on a small anion exchange resin (AER) cartridge from one litre of water sample. They were then efficiently eluted from the AER using a potassium permanganate (KMnO4) solution...
October 2, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28890550/electrochemical-fluorination-and-radiofluorination-of-methyl-phenylthio-acetate-using-tetrabutylammonium-fluoride-tbaf
#20
Mehrdad Balandeh, Christopher Waldmann, Daniela Shirazi, Adrian Gomez, Alejandra Rios, Nathanael Allison, Asad Khan, Saman Sadeghi
Electrochemical fluorination of methyl(phenylthio)acetate was achieved using tetrabutylammonium fluoride (TBAF). Electrochemical fluorination was performed under potentiostatic anodic oxidation using an undivided cell in acetonitrile containing TBAF and triflic acid. The influence of several parameters including: oxidation potential, time, temperature, sonication, TBAF concentration and triflic acid concentration on fluorination efficiency were studied. It was found that the triflic acid to TBAF concentration ratio plays a key role in the fluorination efficiency...
2017: Journal of the Electrochemical Society
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