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Anion exchange resin

Jie Sun, Jing Wang, Rui Zhang, Dongyang Wei, Qin Long, Yu Huang, Xianchuan Xie, Aimin Li
In this study, secondary effluent from the Wulongkou (WLK) municipal wastewater plant (Zhengzhou, China) was tested for its toxicity effects before and after five advanced treatment processes (ATPs, i.e. coagulation sedimentation, nan da magnetic polyacrylic anion exchange resin (NDMP) resin adsorption, activated carbon adsorption, ozonation and electro-adsorption). Results showed that estrogen disruption effects (EDEs) were particularly significant for the raw secondary effluent among the studied dioxin-like toxicity effect, androgenic/anti-androgenic response effect, EDEs, and genotoxicity effect...
October 20, 2016: Chemosphere
Michelle R Robinson, Jennifer S Brodbelt
Tyrosine sulfation is an important post-translational modification but remains difficult to detect in biological samples owing to its low stoichiometric abundance and the lack of effective enrichment methods. In the present study, weak anion exchange (WAX) is evaluated for the enrichment of sulfopeptides that have been modified via carbamylation to convert all primary amines to less basic carbamates. The decrease in basicity enhanced the binding of carbamylated sulfopeptides to WAX resin relative to non-sulfated peptides...
October 21, 2016: Analytical Chemistry
Erwann Le Gendre, Erwan Martin, Benoit Villemant, Pierre Cartigny, Nelly Assayag
RATIONALE: The O- and S- isotope compositions of sulfates can be used as key tracers of the fate and sink of sulfate in both terrestrial and extra-terrestrial environments. However, their application remains limited in those geological systems where sulfate occurs in low concentrations. Here we present a simple and reliable method to extract, purify and concentrate sulfate from natural samples. The method allows us to take into account the separation of nitrate, which is known to be an issue in O-isotope analysis...
October 21, 2016: Rapid Communications in Mass Spectrometry: RCM
Hiroya Tauchi, Yasumoto Sakai, Noriyuki Okawa, Hanifa Faozia, Genki Mizuguchi, Takashi Yasui, Kazutake Takada, Akio Yuchi
The interactions of polyacrylates (PAs with mean molecular weight of 4.5, 25, and 250 kDa; Na(+),pa(-)) with anion exchange resins in the Br(-) form (AXRs; -R(+),Br(-)) were studied under practical conditions by reaction stoichiometry and spectroscopy. The stoichiometric or an excess amount of PA(4.5 kDa) completely replaced Br- in the AXRs of the cross-linking degree of 2 or 8%, respectively, to give (-R(+),pa(-)), due to enhancement in selectivity of carboxylate group by multiple interactions. In contrast, PA(250 kDa) exchanged Br(-) only on the surface of AXRs and did not penetrate into the resins; CO2 was involved in the system to induce exchange with CO3(2-)...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Latchezar I Tsonev, Allen G Hirsh
We have previously described a liquid chromatographic (LC) method for uncoupling controlled, wide range pH gradients and simultaneous controlled gradients of a non-buffering solute on ion exchange resins (Hirsh and Tsonev, 2012) [1]. Here we report the application of this two dimensional LC technique to the problem of resolving Human Transferrin (HT) isoforms. This important iron transporting protein should theoretically occur in several thousand glycoforms, but only about a dozen have been reported. Using dual simultaneous independent gradients (DSIGs) of acetonitrile (ACN) and pH on a mixed bed stationary phase (SP) consisting of a mixture of an anion exchange resin and a reversed phase (RP) resin we partially resolve about 60 isoforms...
October 14, 2016: Journal of Chromatography. A
Ondrej Hanousek, Jakob Santner, Sean Mason, Torsten W Berger, Walter W Wenzel, Thomas Prohaska
A diffusive gradient in thin films (DGT) technique, based on a strongly basic anion exchange resin (Amberlite IRA-400), was successfully tested for (34)S/(32)S analysis in labile soil sulfate. Separation of matrix elements (Na, K, and Ca) that potentially cause non-spectral interferences in (34)S/(32)S analysis by MC ICP-MS (multi-collector inductively coupled plasma-mass spectrometry) during sampling of sulfate was demonstrated. No isotopic fractionation caused by diffusion or elution of sulfate was observed below a resin gel disc loading of ≤79 μg S...
September 29, 2016: Analytical and Bioanalytical Chemistry
Yingying Shi, Tingting Liu, Yun Han, Xiufang Zhu, Xiaojuan Zhao, Xijun Ma, Dingyun Jiang, Qianghua Zhang
An efficient decoloration method for polysaccharides from the sprouts of Toona sinensis (A. Juss.) Roem (PSTS) by anion exchange macroporous resins (AEMR) was investigated in the present paper. The results suggested that D941 resin offered better decoloration efficiency than other tested resins. Based on single-factor experiments, the optimal decoloration parameters of D941 resin were obtained as follows: temperature of 45°C, sample initial concentration of 30mg/ml, pH value of 8.5, static decoloration time of 90min, dynamic decoloration processing volume of 5...
February 15, 2017: Food Chemistry
Jungmin Oh, Balamurali Sreedhar, Megan E Donaldson, Timothy C Frank, Alfred K Schultz, Andreas S Bommarius, Yoshiaki Kawajiri
Reactive chromatography using an anion exchange resin is proposed for a transesterification reaction of propylene glycol methyl ether (DOWANOL™ PM) with ethyl acetate to produce propylene glycol methyl ether acetate (DOWANOL™ PMA). This reaction is studied in batch and chromatographic reactors catalyzed by an anion exchange resin. Several anion exchange resins are tested and compared based on the performance of resin as an adsorbent and a catalyst. A chromatographic column is packed with a selected catalyst, AMBERLITE™ IRA904, and both reaction and chromatographic elution are studied at different temperatures and feed concentrations...
September 30, 2016: Journal of Chromatography. A
Yanliang Chen, Yuezhou Wei, Linfeng He, Fangdong Tang
To separate thorium and uranium in nitric acid solution using anion exchange process, a strong base silica-based anion exchange resin (SiPyR-N4) was synthesized. Batch experiments were conducted and the separation factor of thorium and uranium in 9M nitric acid was about 10. Ion exchange chromatography was applied to separate thorium and uranium in different ratios. Uranium could be eluted by 9M nitric acid and thorium was eluted by 0.1M nitric acid. It was proved that thorium and uranium can be separated and recovered successfully by this method...
September 30, 2016: Journal of Chromatography. A
Agnieszka Krata, Emilia Vassileva, Ewa Bulska
The analytical procedures for reference measurements of the total Hg and methyl mercury (MeHg) mass fractions at various concentration levels in marine biota samples, candidates for certified reference materials (oyster and clam Gafrarium tumidum), were evaluated. Two modes of application of isotope dilution inductively coupled plasma mass spectrometry method (ID ICP-MS), namely direct isotope dilution and species-specific isotope dilution analysis with the use of two different quantification mass spectrometry techniques were compared...
November 1, 2016: Talanta
Biplob Kumar Pramanik, Sagor Kumar Pramanik, Dipok Chandra Sarker, Fatihah Suja
The effects of ozonation, anion exchange resin (AER) and UV/H2O2 were investigated as a pre-treatment to control organic fouling (OF) of ultrafiltration membrane in the treatment of drinking water. It was found that high molecular weight (MW) organics such as protein and polysaccharide substances were majorly responsible for reversible fouling which contributed to 90% of total fouling. The decline rate increased with successive filtration cycles due to deposition of protein content over time. All pre-treatment could reduce the foulants of a Ultrafiltration membrane which contributed to the improvement in flux, and there was a greater improvement of flux by UV/H2O2 (61%) than ozonation (43%) which in turn was greater than AER (23%) treatment...
September 20, 2016: Environmental Technology
Tomoyuki Ohya, Kotaro Nagatsu, Hisashi Suzuki, Masami Fukada, Katsuyuki Minegishi, Masayuki Hanyu, Toshimitsu Fukumura, Ming-Rong Zhang
INTRODUCTION: Copper-64 is an attractive radionuclide for positron emission tomography and is emerging as a radiotherapeutic agent. The demand of (64)Cu with low metallic impurities has increased because of its wide applications when incorporated with antibodies, peptides, and proteins. In this study, we propose a new separation method to produce high-quality (64)Cu using a cation exchange column, as well as an automated separation system suitable for large-scale production. METHODS: (64)Cu was produced from an electrodeposited (64)Ni target via the (64)Ni(p,n)-reaction with a 24MeV HH+ beam at 10eμA (electrical microampere) conducted for 1-3h...
July 30, 2016: Nuclear Medicine and Biology
Asit Mittal
Cholestatic itch is a feature of numerous hepatobiliary disorders such as primary biliary cirrhosis, primary sclerosing cholangitis, the inherited form of cholestasis, and intrahepatic cholestasis of pregnancy. Although undervalued by physicians, cholestatic itch can be a source of great discomfort to the patient and significantly affects quality of life. Many pruritogens such as bile salts, opioids, serotonin, and histamine have been implicated in the pathogenesis of cholestatic itch, but no causative link has ever been established...
2016: Current Problems in Dermatology
Yi Feng Lee, Heiner Graalfs, Christian Frech
An extended model is developed to describe protein retention in mixed-mode chromatography based on thermodynamic principles. Special features are the incorporation of pH dependence of the ionic interaction on a mixed-mode resin and the addition of a water term into the model which enables one to describe the total number of water molecules released at the hydrophobic interfaces upon protein-ligand binding. Examples are presented on how to determine the model parameters using isocratic elution chromatography...
September 16, 2016: Journal of Chromatography. A
Takahisa Yamaguchi, Shigekazu Ohyama, Hiroyuki Furukawa, Nariatsu Sato, Ichiro Ohnishi, Satomi Kasashima, Atsuhiro Kawashima, Masato Kayahara
INTRODUCTION: Sevelamer is an anion exchange resin used to treat hyperphosphatemia. A common adverse effect of sevelamer is constipation. According to a review of the available literature, colon perforation associated with this resin agent was less common. PRESENTATION OF CASE: A 66-year-old man complaining of lower abdominal pain was transferred to our hospital. The patient had been undergoing hemodialysis for chronic renal failure due to rapidly progressive glomerulonephritis, and had been receiving sevelamer hydrochloride 4...
September 2016: Annals of Medicine and Surgery
Marija Ćorović, Mladen Mihailović, Katarina Banjanac, Milica Carević, Ana Milivojević, Nenad Milosavić, Dejan Bezbradica
The aim of this study was to develop simple and efficient method for immobilization of Candida antarctica lipase B onto hydrophobic anion exchange resin Purolite(®) MN102 and to apply immobilized catalyst for the enzymatic synthesis of two valuable esters-isoamyl acetate and L-ascorbyl oleate. At optimized conditions (1 M phosphate buffer pH = 7, 7 h at 25 °C, and 18.75 mg of offered proteins g(-1) of support), immobilized lipase with hydrolytic activity of 888.4 p-nitrophenyl butyrate units g(-1) was obtained...
August 17, 2016: Bioprocess and Biosystems Engineering
Christian Willrodt, Babu Halan, Lisa Karthaus, Jessica Rehdorf, Mattijs K Julsing, Katja Buehler, Andreas Schmid
The efficiency of biocatalytic reactions involving industrially interesting reactants is often constrained by toxification of the applied biocatalyst. Here, we evaluated the combination of biologically and technologically inspired strategies to overcome toxicity related issues during the multi-step oxyfunctionalization of (R)-(+)-limonene to (R)-(+)-perillic acid. Pseudomonas putida GS1 catalyzing selective limonene oxidation via the p-cymene degradation pathway and recombinant P. taiwanensis VLB120 were evaluated for continuous perillic acid production...
August 17, 2016: Biotechnology and Bioengineering
S S Kim, G S Han, G N Kim, D S Koo, I G Kim, J W Choi
The existing decontamination method using electrokinetic equipment after acidic washing for uranium-contaminated soil requires a long decontamination time and a significant amount of electric power. However, after soil washing, with a sulfuric acid solution and an oxidant at 65 °C, the removal of the muddy solution using a 100 mesh sieve can decrease the radioactivity of the remaining coarse soil to the clearance level. Therefore, only a small amount of fine soil collected from the muddy solution requires the electrokinetic process for its decontamination...
November 2016: Journal of Environmental Radioactivity
Eri Nagashima, Takuya Yoshida, Satoshi Matsunaga, Kenji Nomiya
The effect of counteranions on the molecular structures of phosphanegold(i) cluster cations formed by polyoxometalate (POM)-mediated clusterization was investigated. A novel intercluster compound, [{(AuLCl)2(μ-OH)}2]3[α-PMo12O40]2·3EtOH (1-PMo12), was obtained as orange-yellow plate crystals in 12.0% yield from a 6 : 1 molar ratio reaction of the monomeric phosphanegold(i) carboxylato complex [Au(RS-pyrrld)(LCl)] (RS-Hpyrrld = RS-2-pyrrolidone-5-carboxylic acid; LCl = tris(4-chlorophenyl)phosphane) in CH2Cl2 with the free acid-form of Keggin polyoxometalate (POM), H3[α-PMo12O40]·14H2O...
September 14, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Thiago Muza Aversa, Carla Michele Frota da Silva, Paulo Cristiano Silva da Rocha, Elizabete Fernandes Lucas
Contamination of water by phenol is potentially a serious problem due to its high toxicity and its acid character. In this way some treatment process to remove or reduce the phenol concentration before contaminated water disposal on the environment is required. Currently, phenol can be removed by charcoal adsorption, but this process does not allow easy regeneration of the adsorbent. In contrast, polymeric resins are easily regenerated and can be reused in others cycles of adsorption process. In this work, the interaction of phenol with two polymeric resins was investigated, one of them containing a weakly basic anionic exchange group (GD-DEA) and the other, a strongly basic group (GD-QUAT)...
November 1, 2016: Journal of Environmental Management
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