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Anion exchange resin

Matthew J O'Hara, Nathaniel J Murray, Jennifer C Carter, Samuel S Morrison
Zirconium-89 (89 Zr), produced by the (p, n) reaction from naturally monoisotopic yttrium (nat Y), is a promising positron emitting isotope for immunoPET imaging. Its long half-life of 78.4 h is sufficient for evaluating slow physiological processes. A prototype automated fluidic system, coupled to on-line and in-line detectors, has been constructed to facilitate development of new89 Zr purification methodologies. The highly reproducible reagent delivery platform and near-real time monitoring of column effluents allows for efficient method optimization...
February 24, 2018: Journal of Chromatography. A
Guogang Jia
A new method has been developed for determination of210 Pb and a simultaneous determination of210 Po and210 Pb was performed in solid samples.210 Po and210 Pb were sequentially leached at 250 °C with HNO3 +HF, HClO4 and HCl. Twenty percent of the leaching solution was used for210 Po determination by α-spectrometry after210 Po spontaneous deposition on a silver disc from a weak HCl solution that containing hydroxylamine hydrochloride, sodium citrate and209 Po tracer. The remains of the leaching solution were used for determination of210 Pb, conducted by precipitation as PbCrO4 at about pH < 4, purification with an anion-exchange resin column, source preparation as PbSO4 , and measurement with a β-counter...
February 22, 2018: Applied Radiation and Isotopes
Alfonsina D'Amato, Gleb Zilberstein, Svetlana Zilberstein, Mikhail Ivanovich Golovan, Anastasiya Anatolyevna Zhuravleva, Pier Giorgio Righetti
Five different letters and post cards as well as the shirt worn by Anton Chekhov on his death bed, stored in A. Chekhov's museum in Melikhovo (nearby Moscow), have been analyzed by applying to these surfaces EVA (an ethyl vinyl acetate foil studded with crushed strong anion and cation exchangers and with C8 resins) diskettes. Three different eluates (under acidic and basic conditions and with acetonitrile) were analyzed by high resolution mass spectrometry. The environmental microbiota present on samples and the Mycobacterium tuberculosis strain were described by a meta-proteomics approach...
March 9, 2018: Proteomics
Ayswarya Ravi, Shengchun Guo, Beth Rasala, Miller Tran, Stephen Mayfield, Zivko L Nikolov
Correct folding and post-translational modifications are vital for therapeutic proteins to elicit their biological functions. Osteopontin (OPN), a bone regenerative protein present in a range of mammalian cells, is an acidic phosphoprotein with multiple potential phosphorylation sites. In this study, the ability of unicellular microalgae, Chlamydomonas reinhardtii , to produce phosphorylated recombinant OPN in its chloroplast is investigated. This study further explores the impact of phosphorylation and expression from a "plant-like" algae on separation of OPN...
February 16, 2018: International Journal of Molecular Sciences
Marie Louise Bornø, Dorette Sophie Müller-Stöver, Fulai Liu
We investigated how two different biochars (wood biochar - WBC and straw biochar - SBC) affected P dynamics and bioavailability in five different soils differing in pH, C%, texture, Fe, Al, Ca, and Mg giving a range of soils with low (S1 and S2), intermediate (S4), and high (S3 and S5) P sorption capacities. Langmuir and Freundlich equations were fitted to the sorption data of soil and soil/biochar mixtures. P fertilizer applied to all treatments was fractioned into strongly sorbed P (qS), easily available sorbed P (qA) and solution P (c) by determining the anion exchange resin (AER)-extractable P in samples from the sorption experiment...
February 2, 2018: Science of the Total Environment
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
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
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
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
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
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
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
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
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
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
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
Željko Grahek, Silvia Dulanská, Gorana Karanović, Ivana Coha, Ivana Tucaković, Marijana Nodilo, Ľubomír Mátel
The paper describes different isolation/separation and detection procedures for90 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 by90 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 of90 Y and counting of90 Sr(90 Y) on proportional counter were used for the quantitative90 Sr determination...
January 2018: Journal of Environmental Radioactivity
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
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...
January 2018: Chemosphere
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...
January 2018: Chemosphere
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