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Ionic liquid

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https://www.readbyqxmd.com/read/28528111/protection-of-%C3%AE-carotene-from-chemical-degradation-in-emulsion-based-delivery-systems-using-antioxidant-interfacial-complexes-catechin-egg-white-protein-conjugates
#1
Luping Gu, Yujie Su, Mengqi Zhang, Cuihua Chang, Junhua Li, David Julian McClements, Yanjun Yang
The aim of the present study was to fabricate catechin-egg white protein (CT-EWP) conjugates as novel food-grade antioxidant emulsifiers designed to improve the physicochemical stability of β-carotene (BC) emulsions. CT-EWP conjugates were synthesized using free radical grafting, and the formation of conjugates was confirmed by electrophoresis and liquid chromatography-mass spectrometry. The physicochemical stability of BC emulsions was characterized by measuring alterations in particle size, ζ-potential and BC retention...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28526567/synergistic-effects-of-polymyxin-and-ionic-liquids-on-lipid-vesicle-membrane-stability-and-aggregation
#2
Sylvia L Hanna, Jenny L Huang, Alana J Swinton, Gregory A Caputo, Timothy D Vaden
Ionic liquids (ILs) have been investigated for potential antibacterial and antibiotic applications due to their ability to destabilize and permeabilize the lipid bilayers in cell membranes. Bacterial assays have shown that combining ILs with antibiotics can provide a synergistic enhancement of their antibacterial activities. We have characterized the mechanism by which the conventional ILs 1-butyl-3-methylimidazolium chloride (BMICl) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4) enhance the lipid membrane permeabilization of the well-known antibiotic polymyxin B (PMB)...
May 11, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28525726/characterization-of-an-ionic-liquid-tolerant-%C3%AE-xylosidase-from-a-marine-derived-fungal-endophyte
#3
Anindita Sengupta, Angela Zabala, Si Yu Tan, Arthur Broadstock, T S Suryanarayanan, Venkat Gopalan
Ionic liquids (ILs) are used in lignocellulosic biomass (LCB) pretreatment due to their ability to disrupt the extensive hydrogen-bonding network in cellulose and hemicellulose, and thereby decrease LCB recalcitrance to subsequent enzymatic degradation. However, this approach necessitates development of a cellulases and hemicellulases that can tolerate ~20% (w/v) IL, an amount that either co-precipitates with the sugar polymers after the initial pretreatment or is typically used in single-pot biomass deconstructions...
May 19, 2017: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28525273/directional-fluid-gating-by-janus-membranes-with-heterogeneous-wetting-properties-for-selective-oil-water-separation
#4
Prashant Gupta, Balasubramanian Kandasubramanian
The rising oil seepage accidents evolved into a global issue necessitating immediate counter measure to abridge its catastrophic repercussions on sensitive marine ecosystem urging innovative techniques for effective oil/water separation. Here, we report surface tailored wettability modified superhydrophobic/superoleophilic Janus membrane by impregnating non-ionic surfactant stabilized nano-sized polytetrafluoroethylene (PTFE) dispersion polymerized via non-fluorinated processing aid onto cotton substrate using Meyer rod coating technique, exhibiting excellent separation efficiency up to 98% with various petroleum products and retaining its intrinsic properties for at least 30 recurrences...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524925/how-is-charge-transport-different-in-ionic-liquids-the-effect-of-high-pressure
#5
Z Wojnarowska, E Thoms, B Blanchard, S N Tripathy, P Goodrich, J Jacquemin, J Knapik-Kowalczuk, M Paluch
Modern ionic liquids (ILs) are considered green solvents for the future applications due to their inherited advantages and remarkable transport properties. One of the ubiquitous properties of ILs is their intrinsic ionic conductivity. However, understanding of the super-Arrhenius behavior of the ionic conductivity process at elevated pressure still remains elusive and crucial in glass science. In this work, we investigate the ion transport properties of 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide: [C4mim][NTf2], 1-butylimidazolium bis[(trifluoromethyl)-sulfonyl]imide: [C4Him][NTf2] and 1-butylimidazolium hydrogen sulfate: [C4Him][HSO4] ILs in the supercooled liquid state using dielectric spectroscopy at ambient and high pressure...
May 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28523638/quantum-chemical-modeling-of-hydrogen-bonding-in-ionic-liquids
#6
REVIEW
Patricia A Hunt
Hydrogen bonding (H-bonding) is an important and very general phenomenon. H-bonding is part of the basis of life in DNA, key in controlling the properties of water and ice, and critical to modern applications such as crystal engineering, catalysis applications, pharmaceutical and agrochemical development. H-bonding also plays a significant role for many ionic liquids (IL), determining the secondary structuring and affecting key physical parameters. ILs exhibit a particularly diverse and wide range of traditional as well as non-standard forms of H-bonding, in particular the doubly ionic H-bond is important...
June 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28523100/transdermal-bioavailability-in-rats-of-lidocaine-in-the-forms-of-ionic-liquids-salts-and-deep-eutectic
#7
Paula Berton, Kristin R Di Bona, Denise Yancey, Syed A A Rizvi, Marquita Gray, Gabriela Gurau, Julia L Shamshina, Jane F Rasco, Robin D Rogers
Tuning the bioavailability of lidocaine was explored by its incorporation into the ionic liquid lidocainium docusate ([Lid][Doc]) and the deep eutectic Lidocaine·Ibuprofen (Lid·Ibu) and comparing the transdermal absorption of these with the crystalline salt lidocainium chloride ([Lid]Cl). Each form of lidocaine was dissolved in a vehicle cream and topically applied to Sprague-Dawley rats. The concentrations of the active pharmaceutical ingredients (APIs) in blood plasma were monitored over time as an indication of systemic absorption...
May 11, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28522008/chitosan-chondroitin-sulfate-hydrogels-prepared-in-hmim-hso4-ionic-liquid
#8
Cátia S Nunes, Kessily B Rufato, Paulo R Souza, Elizângela A M S de Almeida, Michael J V da Silva, Débora B Scariot, Celso V Nakamura, Fernanda A Rosa, Alessandro F Martins, Edvani C Muniz
[Hmim][HSO4] ionic liquid (IL) and bio-renewable sources as chitosan (CHT) and chondroitin sulfate (CS) were used to yield hydrogel-based materials (CHT/CS). The use of IL to solubilize both polysaccharides was considered an innovative way based on "green chemistry" principle, aiming the production of CHT/CS blended systems. CHT/CS hydrogels were carried out in homogeneous medium from short dissolution times. The hydrogels were characterized and achieved with excellent stabilities (in the 1.2-10pH range), larger swelling capacities, as well as devoid of cytotoxicity towards the normal VERO and diseased HT29 cells...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521086/a-computational-exploration-of-h2s-and-co2-capture-by-ionic-liquids-based-on-%C3%AE-amino-acid-anion-and-n7-n9-dimethyladeninium-cation
#9
Badrosadat Seyedhosseini, Mohammad Izadyar, Mohammad Reza Housaindokht
Hydrogen sulfide (H2S) and carbon dioxide (CO2) adsorption on a series of the aliphatic amino acid ionic liquids (AAILs) composed of N7,N9- dimethyladeninium cation with amino acid anions (AA= Gly, Ala, Val, Leu and Ile) as the functionalized ILs with dual groups of amine have been investigated. Based on the obtained data, the possible sites of H2S adsorption are twice as CO2 on the ionic liquids and also the average adsorption energy of H2S (∆E=-51.5 kJ.mol-1) in the most stable region of adsorption is twice greater than that of CO2 (∆E=-25...
May 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28521081/thermophysical-and-electrochemical-properties-of-ethereal-functionalised-cyclic-alkylammonium-based-ionic-liquids-as-potential-electrolytes-for-electrochemical-applications
#10
Alex Ryan Neale, Sinead Murphy, Peter Goodrich, Christopher Hardacre, Johan Jacquemin
A series of hydrophobic room temperature ionic liquids (ILs) based on ethereal functionalised pyrrolidinium, piperidinium and azepanium cations bearing the bis{(trifluoromethyl)sulfonyl}imide, [TFSI]-, anion were synthesized and characterized. Their physicochemical properties such as density, viscosity and electrical conductivity and thermal properties including phase transition behaviour and decomposition temperature have been measured. All of the ILs showed low melting point, low viscosity and good conductivity and the latter properties have been discussed in terms of the IL fragility, an important electrolyte feature of the transport properties of glassy-forming ILs...
May 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28520196/environmentally-friendly-recycling-of-fuel-cell-s-membrane-electrode-assembly-using-ionic-liquids
#11
Sophie Legeai, Maxime Balva, Nathalie Leclerc, Emmanuel Billy, Eric Meux
The platinum nanoparticles used as catalyst in Proton Exchange Membrane Fuel Cells (PEMFCs) could represent around 46 % of the total price of the cells1 for a large scale production which is one of the limitation of their commercialization. The recycling of this platinum catalyst can then be the best alternative to limit the production cost of PEMFCs. Usual recovery routes for spent catalysts containing platinum are pyro-hydrometallurgical processes in which a calcination step is followed by aqua regia treatment, generating fumes and NOx emission, respectively...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28518073/extraction-and-characterization-of-surfactants-from-atmospheric-aerosols
#12
Barbara Nozière, Violaine Gérard, Christine Baduel, Corinne Ferronato
Surface-active compounds, or surfactants, present in atmospheric aerosols are expected to play important roles in the formation of liquid water clouds in the Earth's atmosphere, a central process in meteorology, hydrology, and for the climate system. But because specific extraction and characterization of these compounds have been lacking for decades, very little is known on their identity, properties, mode of action and origins, thus preventing the full understanding of cloud formation and its potential links with the Earth's ecosystems...
April 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516337/mesoscopic-organization-in-ionic-liquids
#13
REVIEW
Olga Russina, Fabrizio Lo Celso, Natalia Plechkova, Charl J Jafta, Giovanni Battista Appetecchi, Alessandro Triolo
We discuss some published results and provide new observations concerning the high level of structural complexity that lies behind the nanoscale correlations in ionic liquids (ILs) and their mixtures with molecular liquids. It turns out that this organization is a consequence of the hierarchical construction on both spatial (from ångström to several nanometer) and temporal (from fraction of picosecond to hundreds of nanosecond) scales, which requires joint use of experimental and computational tools.
June 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28514858/a-cholesterol-based-surface-active-ionic-liquid-that-can-form-microemulsions-and-spontaneous-vesicles
#14
Arghajit Pyne, Jagannath Kuchlyan, Chiranjit Maiti, Dibakar Dhara, Nilmoni Sarkar
In this article, we have reported the synthesis and physicochemical characterization of a novel L-glycine amino acid derived cholesterol based surface active ionic liquid (SAIL). This SAIL has been explored for the preparation of ionic liquid (IL)-in-oil microemulsions and vesicles. The formation of IL-in-oil microemulsion is characterized by construction of a ternary phase diagram, dynamic light scattering (DLS) measurement, proton nuclear magnetic resonance (1H NMR) study, fluorescence measurement using coumarin 480 (C-480) as a molecular probe and also by recording the diffusion behavior of the molecular probe rhodamine 6G (R6G) in microemulsion droplets through Fluorescence correlation spectroscopy (FCS) technique...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28514060/improved-in-tube-electro-membrane-extraction-followed-by-high-performance-liquid-chromatography-for-simple-and-selective-determination-of-ionic-compounds-optimization-by-central-composite-design
#15
Mohammad Bazregar, Maryam Rajabi, Yadollah Yamini, Alireza Asghari
In this work, an efficient sample clean-up method named in-tube electro-membrane extraction is modified to resolve the formation of bubbles in the extraction process. This modified method is applied for the extraction of two model analytes including tartrazine and sunset yellow from food samples. The method is based upon the electro-kinetic migration of ionized compounds by the application of an electrical potential difference, and on this basis, the analytes under investigation, as anionic compounds, simply migrate from the donor phase, and are concentrated in the acceptor phase...
May 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28512341/a-new-paradigm-in-sweat-based-wearable-diagnostics-biosensors-using-room-temperature-ionic-liquids-rtils
#16
Rujuta D Munje, Sriram Muthukumar, Badrinath Jagannath, Shalini Prasad
Successful commercialization of wearable diagnostic sensors necessitates stability in detection of analytes over prolonged and continuous exposure to sweat. Challenges are primarily in ensuring target disease specific small analytes (i.e. metabolites, proteins, etc.) stability in complex sweat buffer with varying pH levels and composition over time. We present a facile approach to address these challenges using RTILs with antibody functionalized sensors on nanoporous, flexible polymer membranes. Temporal studies were performed using both infrared spectroscopic, dynamic light scattering, and impedimetric spectroscopy to demonstrate stability in detection of analytes, Interleukin-6 (IL-6) and Cortisol, from human sweat in RTILs...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28511932/determination-of-piperidinium-ionic-liquid-cations-in-environmental-water-samples-by-solid-phase-extraction-and-hydrophilic-interaction-liquid-chromatography
#17
Zi-Qiang Fan, Hong Yu
This paper presents a novel analytical method for the determination of piperidinium ionic liquid cations in environmental water by hydrophilic interaction liquid chromatography and solid-phase extraction technology. The left standing, centrifuged and filtered river water samples were first purified and concentrated through the C18 solid phase extraction column, and eluted with 0.02mol/L hydrochloric acid prepared in methanol and deionized water (80/20, v/v). Then the eluents were analyzed by a hydrophilic column combined with 0...
May 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28511538/phonon-like-hydrogen-bond-modes-in-protic-ionic-liquids
#18
Judith Reichenbach, Stuart Ruddell, Mario González-Jiménez, Julio Lemes, David Andrew Turton, David J France, Klaas Wynne
Gigahertz to terahertz frequency infrared and Raman spectra contain a wealth of information concerning the structure, intermolecular forces, and dynamics of ionic liquids. However, these spectra generally have a large number of contributions ranging from slow diffusional modes to underdamped librations, and intramolecular vibrational modes. This makes it difficult to isolate effects such as the role of coulombic and hydrogen-bonding interactions. We have applied far-infrared and ultrafast optical Kerr-effect spectroscopies on carefully selected ions with a greater or lesser degree of symmetry in order to isolate spectral signals of interest...
May 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28506638/ionic-liquid-based-reagents-improve-the-stability-of-midterm-fecal-sample-storage
#19
Lilan Hao, Zhongkui Xia, Huanming Yang, Jian Wang, Mo Han
Fecal samples are widely used in metagenomic research, which aims to elucidate the relationship between human health and the intestinal microbiota. However, the best conditions for stable and reliable storage and transport of these samples at room temperature are still unknown, and whether samples stored at room temperature for several days will maintain their microbiota composition is still unknown. Here, we established and tested a preservation method using reagents containing imidazolium- or pyridinium-based ionic liquids...
May 13, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28505404/activated-porous-carbon-spheres-with-customized-mesopores-through-assembly-of-diblock-copolymers-for-electrochemical-capacitor
#20
Jing Tang, Jie Wang, Lok Kumar Shrestha, Md Shahriar A Hossain, Zeid Abdullah Alothman, Yusuke Yamauchi, Katsuhiko Ariga
A series of porous carbon spheres with precisely adjustable mesopores (4~16 nm), high specific surface area (SSA, ~2000 m2 g-1), and sub-micrometer particle size (~300 nm) have been synthesized through a facile co-assembly of diblock polymer micelles with a nontoxic dopamine source, and a common post-activation process. The mesopore size can be controlled by the diblock polymer, polystyrene-block-poly(ethylene oxide) (PS-b-PEO) templates and has an almost linear dependence on the square root of the degree of polymerization of the PS blocks...
May 15, 2017: ACS Applied Materials & Interfaces
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