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https://www.readbyqxmd.com/read/27889182/development-of-polyethyleneimine-loaded-core-shell-chitosan-hollow-beads-and-their-application-for-platinum-recovery-in-sequential-metal-scavenging-fill-and-draw-process
#1
Myung-Hee Song, Sok Kim, D Harikishore Kumar Reddy, Wei Wei, John Kwame Bediako, Sangwon Park, Yeoung-Sang Yun
Polyethyleneimine (PEI)-loaded chitosan hollow beads (CHBs) were fabricated through the ionotropic gelation process using sodium tripolyphosphate (TPP) as a counter polyanion. The CHBs were loaded with hydrophilic PEI in pre- and/or post-loading methods. Hence, the sorbent could possess a large number of amine groups which were able to function as the binding sites to recover platinum metal ions. The enhancement of the amine groups was confirmed by Fourier transform infrared spectroscopy (FTIR). Isotherm and kinetic studies were carried out to evaluate the sorption performance of the sorbents...
November 18, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27886760/practical-limitations-of-single-particle-icp-ms-in-the-determination-of-nanoparticle-size-distributions-and-dissolution-case-of-rare-earth-oxides
#2
Laurie Fréchette-Viens, Madjid Hadioui, Kevin J Wilkinson
The applicability of single particle ICP-MS (SP-ICP-MS) for the analysis of nanoparticle size distributions and the determination of particle numbers was evaluated using the rare earth oxide, La2O3, as a model particle. The composition of the storage containers, as well as the ICP-MS sample introduction system were found to significantly impact SP-ICP-MS analysis. While La2O3 nanoparticles (La2O3 NP) did not appear to interact strongly with sample containers, adsorptive losses of La(3+)(over 24h) were substantial (>72%) for fluorinated ethylene propylene bottles as opposed to polypropylene (<10%)...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27832302/rapid-ion-exchange-matrix-removal-for-a-decrease-of-detection-limits-in-the-analysis-of-salt-rich-reservoir-waters-for-fluorobenzoic-acids-by-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#3
Paweł Kubica, Véronique Vacchina, Tomasz Wasilewski, Stéphanie Reynaud, Joanna Szpunar, Ryszard Lobinski
A matrix removal procedure with ion-exchange resin prior to analysis for 18 fluorinated benzoic acids (FBAs) tracers in saline (>25% salt) reservoir water was optimized. The elimination of >98% of salt and the simultaneous matrix sample cleanup allowed the direct analysis using the supernatant by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). This resulted in a gain in detection limits for most of the tracers in comparison with the reference method (direct analysis after minimum required dilution)...
November 10, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27819157/improvement-of-side-effects-and-treatment-on-the-experimental-colitis-in-mice-of-a-resin-microcapsule-loading-hydrocortisone-sodium-succinate
#4
Kai Dong, Hefeng Zhang, Yan Yan, Jinyao Sun, Yalin Dong, Ke Wang, Lu Zhang, Xianpeng Shi, Jianfeng Xing
CONTEXT: Extensive or long-time use of corticosteroids often causes many toxic side-effects. The ion exchange resins and the coating material, Eudragit, can be used in combination to form a new oral delivery system to deliver corticosteroids. OBJECTIVES: The resin microcapsule (DRM) composed by Amberlite 717 and Eudragit S100 was used to target hydrocortisone (HC) to the colon in order to improve its treatment effect on ulcerative colitis (UC) and reduce its toxic side-effects...
November 21, 2016: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/27805763/superparamagnetic-composites-based-on-ionic-resin-beads-caco3-magnetite
#5
Ion Bunia, Vlad Socoliuc, Ladislau Vekas, Florica Doroftei, Cristian Varganici, Adina Coroaba, Bogdan C Simionescu, Marcela Mihai
The preparation of superparamagnetic composites obtained by CaCO3 mineralization from supersaturate aqueous solutions is presented. The preparation was conducted in the presence of oleic acid stabilized magnetite nanoparticles as a water-based magnetic fluid and insoluble templates as gel-like cross-linked polymeric beads. The presence of the magnetic particles in the composites provides a facile way for external manipulation using a permanent magnet, thus allowing the separation and extraction of magnetically modified materials...
November 2, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27778226/in-vitro-clearance-of-doxorubicin-with-a-dna-based-filtration-device-designed-for-intravascular-use-with-intra-arterial-chemotherapy
#6
Mariam S Aboian, Jay F Yu, Ayushi Gautam, Chia-Hung Sze, Jeffrey K Yang, Jonathan Chan, Prasheel V Lillaney, Caroline D Jordan, Hee-Jeung Oh, David M Wilson, Anand S Patel, Mark W Wilson, Steven W Hetts
To report a novel method using immobilized DNA within mesh to sequester drugs that have intrinsic DNA binding characteristics directly from flowing blood. DNA binding experiments were carried out in vitro with doxorubicin in saline (PBS solution), porcine serum, and porcine blood. Genomic DNA was used to identify the concentration of DNA that shows optimum binding clearance of doxorubicin from solution. Doxorubicin binding kinetics by DNA enclosed within porous mesh bags was evaluated. Flow model simulating blood flow in the inferior vena cava was used to determine in vitro binding kinetics between doxorubicin and DNA...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27774905/estradiol-uptake-in-a-combined-magnetic-ion-exchange-ultrafiltration-miex-uf-process-during-water-treatment
#7
Alessandra Imbrogno, Jennifer Biscarat, Andrea Iris Schäfer
BACKGROUND: Estrogens and their synthetic analogues are widely used as pharmaceuticals. Upon oral administration these drugs are eventually excreted via urine. The persistence of these pharmaceuticals and inefficient removal by water treatment lead to accumulation in surface water and effluents with negative effects for aquatic life and human health. METHODS: In this study, the uptake of estradiol by a combined magnetic ion exchange resin - ultrafiltration process (MIEX-UF) was investigated...
October 21, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27774045/automated-small-scale-protein-purification-and-analysis-for-accelerated-development-of-protein-therapeutics
#8
Xavier LeSaout, Matteo Costioli, Lynn Jordan, Jeremy Lambert, Ross Beighley, Laurel Provencher, Brian Gerwe, Kevin McGuire, Nico Verlinden, Andrew Barry
Small-scale protein purification presents opportunities for accelerated process development of biotherapeutic molecules. Miniaturization of purification conditions reduces time and allows for parallel processing of samples, thus offering increased statistical significance and greater breadth of variables. The ability of the miniaturized platform to be predictive of larger scale purification schemes is of critical importance. The PerkinElmer JANUS BioTx Pro and Pro-Plus workstations were developed as intuitive, flexible, and automated devices capable of performing parallel small-scale analytical protein purification...
March 2016: Engineering in Life Sciences
https://www.readbyqxmd.com/read/27771408/activity-of-a-peptidase-secreted-by-phanerochaete-chrysosporium-depends-on-lysine-to-subsite-s-1
#9
Ronivaldo Rodrigues da Silva, Lilian Caroline Gonçalves de Oliveira, Maria Aparecida Juliano, Luiz Juliano, Jose C Rosa, Hamilton Cabral
Peptidases are enzymes that catalyze the rupture of peptide bonds. Catalytic specificity studies of these enzymes have illuminated their modes of action and preferred hydrolysis targets. We describe the biochemical characteristics and catalytic specificity of a lysine-dependent peptidase secreted by the basidiomycete fungus Phanerochaete chrysosporium. We attained 5.7-fold purification of a ∼23-kDa neutral peptidase using size-exclusion (Sephadex G-50 resin) and ion-exchange (Source 15S resin) chromatography...
October 19, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27766859/differential-effects-of-high-atmospheric-n-and-s-deposition-on-bog-plant-lichen-tissue-and-porewater-chemistry-across-the-athabasca-oil-sands-region
#10
R Kelman Wieder, Melanie A Vile, Kimberli D Scott, Cara M Albright, Kelly McMillen, Dale H Vitt, Mark Fenn
Oil extraction and development activities in the Athabasca Oil Sands Region of northern Alberta, Canada release NOx, SOx, and NHx to the atmosphere, ultimately resulting in increasing N and S inputs to surrounding ecosystems through atmospheric deposition. Peatlands are a major feature of the northern Alberta landscape, with bogs covering 6-10% of the land area, and fens covering 21-53%. Bulk deposition of NH4+-N, NO3--N, total inorganic N (TIN), and SO42--S, was quantified using ion exchange resin collectors deployed at 23 locations, over 1-6 years, reveal maximum N and S deposition of 9...
October 21, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27765805/total-colectomy-for-colon-perforation-after-kayexalate-administration-a-case-report-and-literature-review-of-a-rare-complication
#11
Robert Hunt Dunlap, Ryan Martinez
Kayexalate is an ion exchange resin that is commonly used to acutely treat patients with hyperkalemia. Bowel ulceration and necrosis is a rare and uncommonly recognized complication of kayexalate administration. More often, concomitant administration with sorbitol is reported to damage the bowel; however, there are reports of kayexalate administration causing bowel necrosis without sorbitol. We present a case of a critically ill patient who underwent total colectomy for colonic necrosis secondary to oral kayexalate administration that was not recognized until late in the pathologic process...
October 7, 2016: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/27750003/experimental-determination-of-zinc-isotope-fractionation-in-complexes-with-the-phytosiderophore-2-deoxymugeneic-acid-dma-and-its-structural-analogues-and-implications-for-plant-uptake-mechanisms
#12
Tamara Markovic, Saba Manzoor, Emma Humphreys-Williams, Guy Kirk, Ramon Vilar, Dominik Jakob Weiss
The stable isotope signatures of zinc are increasingly used to study plant and soil processes. Complexation with phytosiderophores is a key process and understanding the controls of isotope fractionation is central to such studies. Here, we investigated isotope fractionation during complexation of Zn2+ with the phytosiderophore 2'-deoxymugeneic acid (DMA) - which we synthesised - and with three commercially-available structural analogues of DMA: EDTA, TmDTA and CyDTA. We used ion exchange chromatography to separate free and complexed zinc, and identified appropriate cation exchange resins for the individual systems...
October 17, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27729829/modelling-the-acid-base-1-h-nmr-chemical-shift-limits-of-metabolites-in-human-urine
#13
Gregory D Tredwell, Jacob G Bundy, Maria De Iorio, Timothy M D Ebbels
INTRODUCTION: Despite the use of buffering agents the (1)H NMR spectra of biofluid samples in metabolic profiling investigations typically suffer from extensive peak frequency shifting between spectra. These chemical shift changes are mainly due to differences in pH and divalent metal ion concentrations between the samples. This frequency shifting results in a correspondence problem: it can be hard to register the same peak as belonging to the same molecule across multiple samples. The problem is especially acute for urine, which can have a wide range of ionic concentrations between different samples...
2016: Metabolomics: Official Journal of the Metabolomic Society
https://www.readbyqxmd.com/read/27713017/purification-and-characterization-of-d-allulose-3-epimerase-derived-from-arthrobacter-globiformis-m30-a-gras-microorganism
#14
Akihide Yoshihara, Taro Kozakai, Tomoya Shintani, Ryo Matsutani, Kouhei Ohtani, Tetsuo Iida, Kazuya Akimitsu, Ken Izumori, Pushpa Kiran Gullapalli
An enzyme that catalyzes C-3 epimerization between d-fructose and d-allulose was found in Arthrobacter globiformis strain M30. Arthrobacter species have long been used in the food industry and are well-known for their high degree of safety. The enzyme was purified by ion exchange and hydrophobic interaction chromatographies and characterized as a d-allulose 3-epimerase (d-AE). The molecular weight of the purified enzyme was estimated to be 128 kDa with four identical subunits. The enzyme showed maximal activity and thermostability in the presence of Mg(2+)...
October 3, 2016: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/27696832/aluminum-cycle-ion-exchange-process-for-hardness-removal-a-new-approach-for-sustainable-softening
#15
Jinze Li, Suman Koner, Michael German, Arup K Sengupta
From a sustainability viewpoint, sodium exchange softening, although used widely, is under scrutiny due to its production of excess Na-laden spent regenerant and subsequent discharge to the environment. Many arid regions are introducing regulations disallowing dumping of concentrated sodium salts, the residuals from popular Na-exchange softening. The sodium content of the softened water is, also, always higher than in the feed, which poses a dietary health concern when used for drinking or cooking. An efficient, easy-to-operate hardness removal process with reduced sodium in both the treated water and in the spent regenerant is an unmet global need...
October 4, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27688175/multiple-simultaneous-independent-gradients-for-a-versatile-multidimensional-liquid-chromatography-part-ii-application-1-large-increases-in-isoform-resolution-of-human-transferrin-by-use-of-dual-simultaneous-independent-gradients-of-ph-acetonitrile-on-a-mixed
#16
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
https://www.readbyqxmd.com/read/27639209/decontamination-of-spent-ion-exchangers-contaminated-with-cesium-radionuclides-using-resorcinol-formaldehyde-resins
#17
Marina Palamarchuk, Andrey Egorin, Eduard Tokar, Mikhail Tutov, Dmitry Marinin, Valentin Avramenko
The origin of the emergence of radioactive contamination not removable in the process of acid-base regeneration of ion-exchange resins used in treatment of technological media and liquid radioactive waste streams has been determined. It has been shown that a majority of cesium radionuclides not removable by regeneration are bound to inorganic deposits on the surface and inside the ion-exchange resin beads. The nature of the above inorganic inclusions has been investigated by means of the methods of electron microscopy, IR spectrometry and X-ray diffraction...
September 4, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27631422/self-oriented-ag-based-polycrystalline-cubic-nanostructures-through-polymer-stabilization
#18
Amanda Alonso, Núria Vigués, Rosalía Rodríguez-Rodríguez, Xavier Borrisé, María Muñoz, Dmitri N Muraviev, Jordi Mas, Xavier Muñoz-Berbel
This paper presents the study of the dynamics of the formation of polymer-assisted highly-orientated polycrystalline cubic structures (CS) by a fractal-mediated mechanism. This mechanism involves the formation of seed Ag@Co nanoparticles by InterMatrix Synthesis and subsequent overgrowth after incubation at a low temperature in chloride and phosphate solutions. These ions promote the dissolution and recrystallization in an ordered configuration of pre-synthetized nanoparticles initially embedded in negatively-charged polymeric matrices...
October 21, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27614730/separation-of-thorium-and-uranium-in-nitric-acid-solution-using-silica-based-anion-exchange-resin
#19
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
https://www.readbyqxmd.com/read/27611484/enhancement-of-ocular-in-situ-gelling-properties-of-low-acyl-gellan-gum-by-use-of-ion-exchange
#20
Kenneth Reed, Amy Li, Britney Wilson, Tetchi Assamoi
PURPOSE: The purpose of this study was to determine if the addition of calcium gluconate to gellan solution results in a stronger gel structure on initial exposure to tear fluid due to the displacement of calcium from the gluconate ion by tear monovalent cations (Na(+), K(+)). METHODS: Test solutions of gellan and gellan-calcium gluconate were mixed thoroughly with simulated tear fluid (STF) at a 5:1 ratio. The resulting gel was measured for viscosity at 32°C-36°C...
September 9, 2016: Journal of Ocular Pharmacology and Therapeutics
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