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Anion exchange resin

Jing Li, Suan Shi, Maobing Tu, Brain Via, Fubao Fuelbio Sun, Sushil Adhikari
Bioconversion of lignocellulose to biofuels suffers from the degradation compounds formed during pretreatment and acid hydrolysis. In order to achieve an efficient biomass to biofuel conversion, detoxification is often required before enzymatic hydrolysis and microbial fermentation. Prehydrolysates from ethanol organosolv-pretreated pine wood were used as substrates in butanol fermentation in this study. Six detoxification approaches were studied and compared, including overliming, anion exchange resin, nonionic resin, laccase, activated carbon, and cysteine...
May 2, 2018: Applied Biochemistry and Biotechnology
Sarah Plummer, Craig Gorman, Tarrah Henrie, Kyle Shimabuku, Robert Thompson, Chad Seidel
Hexavalent chromium [Cr(VI)] in drinking water is pending regulation in California and is being considered for regulation in other locations. While strong-base anion exchange (SBA-IX) can efficiently remove Cr(VI) to low-levels that may be required to comply with future MCLs, operational and maintenance (O&M) costs can be considerable if the spent brine is disposed of as hazardous waste. Through bench- and pilot-scale experiments and full-scale demonstrations, this study examined the ability of emerging and established brine treatment and reuse techniques as well as recently developed resins to decrease O&M costs...
April 10, 2018: Water Research
Matthew R Brown, Michael S Burnham, Scott C Lute, Sarah A Johnson, Alison A Walsh, Kurt A Brorson, David J Roush
A multi-tiered approach to determine the binding mechanism of viral clearance utilizing a multi-modal anion exchange resin was applied to a panel of four viral species that are typically used in validating viral clearance studies (i.e., X-MuLV, MVM, REO3, and PrV). First, virus spiked buffer-only experiments were conducted to evaluate the virus's affinity for single mode and multi-modal chromatography resins under different buffer conditions in a chromatography column setting. From these results we hypothesize that the mechanisms of binding of the viruses involve binding to both the hydrophobic and anionic functional groups...
April 30, 2018: Biotechnology Progress
M G Holyavka, A R Kayumov, D R Baydamshina, V A Koroleva, E Yu Trizna, M V Trushin, V G Artyukhov
The enzymatic hydrolysis of poly- and oligosaccharides from plants seems like an advantageous approach for sugars production. Two inulinases producing fructose from plant oligosaccharides were isolated from yeast Kluyveromyces marxianus and plant Helianthus tuberosus. Both enzymes were immobilized on polymeric carriers by using the static adsorption approach. We could save 80.4% of the initial catalytic activity of plant inulinase immobilized on KU-2 cation-exchange resin and 75.5% of yeast enzyme activity adsorbed on AV-17-2P anion-exchange resin...
April 23, 2018: International Journal of Biological Macromolecules
Kamila Kołacińska, Zbigniew Samczyński, Jakub Dudek, Anna Bojanowska-Czajka, Marek Trojanowicz
This work refers to a comparative study of sorbents widely used in determinations of 99 Tc such as TEVA resin and Dowex 1. Despite having a similar functional group of quaternary amines, both materials represent different chromatographic methods-extraction (TEVA resin) and anion exchange (Dowex 1)-which provides a diverse range of their properties significant in determination of 99 Tc in flow conditions. The comparative tests, carried out in a SIA-LOV (Sequential Injection Analysis-Lab-on-Valve) system combined with mass spectrometric (ICP-MS) detection, considered several factors that are crucial from the standpoint of resin´s utility such as sorption capacity, durability, or selectivity, critical in 99 Tc separation from interferences...
July 1, 2018: Talanta
Fuhar Dixit, Benoit Barbeau, Madjid Mohseni
Microcystins are the most commonly occurring cyanotoxins, and have been extensively studied across the globe. In the present study, a strongly basic anion exchange resin was employed to investigate the removal of Microcystin-LR (MCLR), one of the most toxic microcystin variants. Factors influencing the uptake behavior included the MCLR and resin concentrations, resin dosage, and natural organic matter (NOM) characteristics, specifically, the charge density and molecular weight distribution of source water NOM...
March 29, 2018: Water Research
Yunsu Lee, Hanseung Lee, Dohyun Jung, Zhengxin Chen, Seungmin Lim
This paper presents the effect of anion exchange resin (AER) on the adsorption of chloride ions in cement mortar. The kinetic and equilibrium behaviors of AER were investigated in distilled water and Ca(OH)₂ saturated solutions, and then the adsorption of chloride ions by the AER in the mortar specimen was determined. The AER was used as a partial replacement for sand in the mortar specimen. The mortar specimen was coated with epoxy, except for an exposed surface, and then immersed in a NaCl solution for 140 days...
April 5, 2018: Materials
Chandan Kumar Karan, Manish Bhattacharjee
Two new bimetallic iron-alkali metal complexes of amino acid (serine)-based reduced Schiff base ligand were synthesized and structurally characterized. Their efficacy as catalysts for the chemical fixation of carbon dioxide was explored. The heterogeneous version of the catalytic reaction was developed by the immobilization of these homogeneous bimetallic iron-alkali metal complexes in an anion-exchange resin. The resin-bound complexes can be used as recyclable catalysts up to six cycles.
April 2, 2018: Inorganic Chemistry
Yangyang Zhao, Xiaoyan Dong, Linling Yu, Yang Liu, Yan Sun
Previously, we have studied protein adsorption and chromatographic behaviors on poly(ethylenimine) (PEI)-grafted Sepharose FF anion-exchange resins, and found that protein uptake rates increased greatly when PEI grafting density reached over a critical ionic capacity (cIC) due to the occurrence of the "chain delivery" effect. Moreover, by partial charge neutralization of starting resin FF-PEI-L740 (IC = 740 mmol/L, larger than the cIC) with sodium acetate to FF-PEI-R440, it exhibited a three-fold increase in uptake rate over FF-PEI-L740...
March 23, 2018: Journal of Chromatography. A
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...
June 15, 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...
May 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...
March 1, 2018: 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
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