Read by QxMD icon Read

ion exchange resin

Sylvie Pochet, Céline Arnould, Perrine Debournoux, Jocelyne Flament, Odile Rolet-Répécaud, Eric Beuvier
Lactoferrin is an iron-binding cationic glycoprotein (pI = 8.7) beneficial for mammal health, especially udder and milk preservation. A new simple two-step method of quantification was developed. Lactoferrin in 1 mL of bovine skim milk was first adsorbed onto 100 mg of macroporous sulfonated-resin at pH 6.8 by rotary stirring for 90 min at 20-25 °C. After washing the resin, lactoferrin was desorbed using 1 mL of 2 M NaCl containing phenylalanine as a dilution marker, then fully resolved and quantified by RP-HPLC at 220 nm using a wide-bore C4 silica column...
September 1, 2018: Food Chemistry
Mingming Wang, Habtamu Admassu Tessema, Mohammed A A Gasmalla, Xiao Hua, Ruijin Yang
BACKGROUND: Lactulose, a valuable lactose-originated "bifidus factor" product, is exclusively produced by chemical-based isomerization commercially. Complexing agent of sodium aluminate exhibited high conversion efficiency and strong recyclable stability is more practical for industrial applications. In this study, efficient purification of high-purity lactulose through recycling of sodium aluminate and further desalination by nanofiltration (NF) was implemented in a pilot scale...
April 16, 2018: Journal of the Science of Food and Agriculture
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
Guangxin Wang, Yunchao Zhao, Bin Yang, Yongfa Song
BACKGROUND: High purity cobalt has many important applications, such as magnetic recording media, magnetic recording heads, optoelectronic devices, magnetic sensors, and integrated circuits, etc. To produce 5N or higher purity cobalt in an electro-refining process, one of the challenges is to effectively reduce the Fe content of aqueous cobalt salt solution before electrolysis. This paper describes thermodynamic and kinetic investigations of the Fe adsorption process of a new sulfonated monophosphonic resin with the trade mark Monophos...
January 2018: Journal of Applied Biomaterials & Functional Materials
Lan Tang, Lulu Fu, Zhuanfeng Zhu, Yan Yang, Boxuan Sun, Weiguang Shan, Zhenhai Zhang
Polymer nanoparticles modified with collagen peptides (CPs) are an attractive strategy for the oral delivery of active ingredients from Chinese medicine. Thus, in the present study, collagen cationic CPs were simply separated using ion-exchange resin from bovine CPs, to modify mixed nanomicelles (MMs) on the surface to improve the oral bioavailability of Cucurbitacin B (CuB). The physicochemical property of micelles was characterized, which confirmed the successful modification of the nanomicelles. CPs-modified nanomicelles in vitro were found to significantly increase cellular uptake and transportation...
January 1, 2018: Drug Delivery
Ran Niu, Thomas Palberg
We propose a simple seedless approach to assemble millimeter sized monolayer single colloidal crystals with desired orientations at predetermined locations on an unstructured charged substrate. This approach utilizes the millimeter-ranged fluid flow on the bottom glass substrate induced by an ion exchange resin (IEX) fixed on top of the closed sample cell. The fluid flow increases with decreasing height of the sample cell and increasing radius R of the IEX. For a single inverted pump, millimeter sized monolayer single crystals of hexagonal close packing can be obtained...
March 28, 2018: Soft Matter
Lin Zhang, Yan Sun
Regulation of molecular orientation of charged dipeptides and involved interactions by electrostatic repulsion from like-charged surfaces were studied using all-atom molecular dynamics simulations. It was found that a charged surface can induce oriented alignment of like-charged peptides, and the oriented alignment leads to enhanced electrostatic repulsion between the peptide molecules. The findings are consistent with previous experimental results about the inhibition of charged protein aggregation using like-charged ion-exchange resin...
March 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Atsushi Hirano, Kazuki Iwashita, Shun Sakuraba, Kentaro Shiraki, Tsutomu Arakawa, Tomoshi Kameda
Ion-exchange chromatography and multimodal ion-exchange chromatography are widely used for the separation of small molecules, peptides and proteins. Salts generally attenuate the electrostatic interactions between charged moieties of solutes and those of resins through electrostatic screening. However, little is known about how salts affect the interaction between the uncharged moieties of the solutes, such as aromatic moieties, and the charged moieties of the resins. In this study, we used alkyl gallates as model aromatic solutes to investigate the interaction mechanism of aromatic moieties with multimodal and conventional ion-exchange resins...
March 6, 2018: Journal of Chromatography. A
Rodrigo de Abreu Domingos, Fabiana Valéria da Fonseca
The oil refinery industry seeks solutions to reduce its water uptake and consumption by encouraging the reuse of internal streams and wastewater from treatment systems. After conventional treatment the petroleum refinery wastewater still contains a considerable quantity of recalcitrant organics and the adsorption on activated carbon is currently used in Brazilian refineries, although it is still expensive due to the difficulty of its regeneration. This study evaluated the use of adsorbent and ion exchange resins for the removal of organic matter from refinery wastewater after conventional treatment in order to verify its feasibility, applying successive resin regenerations and comparing the results with those obtained for activated carbon process...
March 12, 2018: Journal of Environmental Management
Liping Zhang, Alexandre Goncalves, Baojiang Jiang, Mietek Jaroniec
Due to the scarcity of iodine as well as its threat to the environment if in excess, iodine as a waste needs to be captured. As compared with ion-exchange resins and silver-containing materials, which are two popular iodide adsorbents, bismuth-containing compounds show some important advantages such as high iodide capture capacity and fast kinetics. In this study, two bismuth-containing compounds, bismuth vanadate (BiVO4) and bismuth oxide (Bi2O3), have been comprehensively investigated for iodide immobilization...
March 14, 2018: ChemSusChem
Valentin H Klaus, Till Kleinebecker, Verena Busch, Markus Fischer, Norbert Hölzel, Sascha Nowak, Daniel Prati, Deborah Schäfer, Ingo Schöning, Marion Schrumpf, Ute Hamer
The intensification of land use constitutes one of the main drivers of global change and alters nutrient fluxes on all spatial scales, causing landscape-level eutrophication and contamination of natural resources. Changes in soil nutrient concentrations are thus indicative for crucial environmental issues associated with intensive land use. We measured concentrations of NO3 -N, NH4 -N, P, K, Mg and Ca by using 1326 ion-exchange resin bags buried in 20 cm depth beneath the main root zone in 150 temperate grasslands...
March 11, 2018: Global Change Biology
Felix Wittkopp, Lars Peeck, Mathias Hafner, Christian Frech
Process development and characterization based on mathematic modeling provides several advantages and has been applied more frequently over the last few years. In this work, a Donnan equilibrium ion exchange (DIX) model is applied for modelling and simulation of ion exchange chromatography of a monoclonal antibody in linear chromatography. Four different cation exchange resin prototypes consisting of weak, strong and mixed ligands are characterized using pH and salt gradient elution experiments applying the extended DIX model...
February 12, 2018: Journal of Chromatography. A
Manoj Kumar, Deepak Kaushik
Drugs having absorption window in the stomach or upper small intestine has restricted bioavailability with conventional dosage forms. The gastric residence time of these dosage forms is usually short and they do not show drug release for prolonged period of time. To avoid these problems and to enhance the bioavailability and gastric retention time of these drugs, controlled drug delivery systems with prolonged gastric retention time are currently being developed. This review highlights the various pharmaceutical approaches for gastroretention such as floating drug delivery systems, mucoadhesive systems, high density systems, expandable and swelling systems, superporous hydrogels systems, magnetic systems, ion exchange resin system and recent patents filed or granted for these approaches...
March 8, 2018: Recent Patents on Drug Delivery & Formulation
Yali Liu, Peng Li, Rong Qian, Tianyu Sun, Fangzhi Fang, Zonghua Wang, Xue Ke, Bohui Xu
The primary objective of this study was to mask bitter taste and decrease the disintegration time of carbinoxamine maleate (CAM) orally disintegrating tablets (ODTs). In order to screen the prescription of ODTs, a novel modified in vitro disintegration method (MIVDM) was developed to measure the in vitro disintegration time. In this method, different concentrations of ethanol served as disintegration medium in order to delay the in vitro water absorption and disintegration process of tablets. The MIVDM demonstrated good in vitro and in vivo correlation (IVIVC) and proved more precise and discriminative than other reported methods...
March 9, 2018: Drug Development and Industrial Pharmacy
Elżbieta Królak, Jolanta Raczuk, Danuta Sakowicz, Elżbieta Biardzka
Background: Home methods of drinking water treatment through filtration have recently become quite popular. Objective: The aim of the study was to compare chemical composition of unfiltered water with water filtered in households with pitcher water filters. Obtained results were discussed in view of the effect of analysed chemical components of water on human health. Material and methods: Water samples were taken from water works supplies and from home dug wells from the agricultural area...
2018: Roczniki Państwowego Zakładu Higieny
Yuntong Kou, Mike Halpenny, Heidi Elmoazzen, Sandra Ramirez-Arcos
BACKGROUND: Bacterial contamination of cord blood (CB) represents a safety risk for transplantation patients. CB sterility testing at Canadian Blood Services' Cord Blood Bank is performed using a 1:1 mix of CB-derived plasma and red blood cells (RBCs). Culture bottles of an automated culture system, which lack antimicrobial neutralization properties, are used for bacterial screening of CB. This process is unsuitable for CB-containing antibiotics, potentially resulting in false-negative results...
March 7, 2018: Transfusion
Caroline Serino-Silva, Karen Morais-Zani, Marcos Hikari Toyama, Daniela de Oliveira Toyama, Henrique Hessel Gaeta, Caroline Fabri Bittencourt Rodrigues, Wéslei da Silva Aguiar, Alexandre Keiji Tashima, Kathleen Fernandes Grego, Anita Mitico Tanaka-Azevedo
Phospholipases A2 (PLA2) are enzymes acting on the cell membrane phospholipids resulting in fatty acids and lysophospholipids and deconstructing the cell membrane. This protein is commonly found in snake venoms, causing tissue inflammation in the affected area. Evidence indicates that snakes have natural resistance to their own venom due to protective properties in plasma, that inhibit the action of proteins present in their venom. Given that, this study aimed to purify and characterize a γPLI from Bothrops jararaca serum, named γBjPLI...
2018: PloS One
A S Krivobok, Yu A Berkovich, V A Shcherbakova, N A Chuvilskaya
One way to cut consumables for space plant growth facilities (PGF) with artificial soil in the form of fibrous ion-exchange resin substrate (FIERS) is on-board regeneration of the used medium. After crop harvest the procedure includes removal of the roots from the fibrous media with preservation of the exchanger properties and capillary structure. One type of FIERS, namely BIONA-V3ۛ, has been used in Russian prototypes of space conveyors. We describe a two-stage treatment of BIONA-V3ۛ including primary microwave heating of the used FIERS until (90 ± 5) °C in alkali-peroxide solution during 3...
February 2018: Life Sciences in Space Research
Yi Feng Lee, Matthias Jöhnck, Christian Frech
The efficiencies of mono gradient elution and dual salt-pH gradient elution for separation of six mAb charge and size variants on a preparative-scale ion exchange chromatographic resin are compared in this study. Results showed that opposite dual salt-pH gradient elution with increasing pH gradient and simultaneously decreasing salt gradient is best suited for the separation of these mAb charge and size variants on Eshmuno® CPX. Besides giving high binding capacity, this type of opposite dual salt-pH gradient also provides better resolved mAb variant peaks and lower conductivity in the elution pools compared to single pH or salt gradients...
February 21, 2018: Biotechnology Progress
Vignesh Narasimhan Janakiraman, Marion Solé, Sophie Maria, Jérome Pezzini, Charlotte Cabanne, Xavier Santarelli
Chromatographic performances are highly influenced by operational parameters. New ion exchangers have tailored matrices providing low backpressure, thereby allowing high flow velocity. By systematic frontal analysis and selectivity determination at different flow rates, we independently evaluated cation exchangers to facilitate media selection and investigated the relationship between surface modification and chromatographic performances. Structure-extended resins showed higher binding capacities compared to resins with conventional ligands directly attached to the matrix...
February 13, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"