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https://www.readbyqxmd.com/read/27919562/impact-of-pre-equilibration-and-diffusion-limited-release-kinetics-on-effluent-concentration-in-column-leaching-tests-insights-from-numerical-simulations
#1
Michael Finkel, Peter Grathwohl
Column leaching tests have become a standard method for assessing leaching of pollutants from materials used, e.g., for road and railway constructions and in landscaping measures. Column tests showed to be practical in laboratories yielding robust and reproducible results. However, considerable uncertainty still exists related particularly to the degree of equilibration of the pore water with the solids during preparation (pre-equilibration) and percolation of the column. We analyse equilibration time scales and sensitivity of concentrations in column leachate with respect to initial conditions in a series of numerical experiments covering a broad spectrum of material and solute properties...
December 2, 2016: Waste Management
https://www.readbyqxmd.com/read/27919517/centrifugal-partition-chromatography-a-preparative-tool-for-isolation-and-purification-of-xylindein-from-chlorociboria-aeruginosa
#2
Anukul Boonloed, Genevieve L Weber, Kelly M Ramzy, Veronica R Dias, Vincent T Remcho
A centrifugal partition chromatography (CPC) method was developed for the preparative-scale isolation and purification of xylindein from the wood-staining fungi, Chlorociboria aeruginosa. Xylindein, a blue-green pigment naturally secreted from the hyphae and fruiting bodies of the fungus, has great value in the decorative wood industry and textile coloration. Xylindein has great potential for use as a fluorescent labeling agent as well as in organic semiconductor applications. However, a primary limitation of xylindein is its poor solubility in most common HPLC solvents...
November 18, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27916116/atmospheric-pressure-solution-cathode-glow-discharge-a-versatile-ion-source-for-atomic-and-molecular-mass-spectrometry
#3
Andrew J Schwartz, Kelsey L Williams, Gary M Hieftje, Jacob T Shelley
An atmospheric-pressure solution-cathode glow discharge (SCGD) has been evaluated as an ion source for atomic, molecular, and ambient desorption/ionization mass spectrometry. The SCGD consists of a direct-current plasma, supported in the ambient air in the absence of gas flows, and sustained upon the surface of a flowing liquid cathode. Analytes introduced in the flowing liquid, as an ambient gas, or as a solid held near the plasma are vaporized and ionized by interactions within or near the discharge. Introduction of acidic solutions containing metal salts produced bare elemental ions as well as H2O, OH(-) and NO3(-) adducts...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27915030/the-effect-of-anionic-dicephalic-surfactants-on-fabrication-of-varied-core-nanocarriers-for-sustained-release-of-porphyrin-photosensitizers
#4
Urszula Bazylińska, Renata Frąckowiak, Zbigniew Brzózka, Kazimiera A Wilk
Double-headed anionic surfactants could provide a profound group of efficient stabilizers of new template-mediated nanocarriers for effective encapsulation and sustained release of highly hydrophobic photosensitizers, and therefore their improved therapeutic activity in photodynamic therapy (PDT) protocols. We have thus encapsulated porphyrin-origin dyes, i.e., verteporfin (VP) and meso-tetraphenylporphyrin (TPP) in different types of sodium alkyliminobisacetates, Cn(COONa)2-stabilized nanosystems including biocompatible poly(l-glutamic acid)/poly(l-lysine) - PGA/PLL, multilayer nanocapsules (NCs)...
November 19, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27914326/molecular-interactions-in-high-conductive-gel-electrolytes-based-on-low-molecular-weight-gelator
#5
Michał Bielejewski, Andrzej Łapiński, Oleg Demchuk
Organic ionic gel (OIG) electrolytes, also known as gel electrolytes or ionogels are one example of modern functional materials with the potential to use in wide range of electrochemical applications. The functionality of OIGs arises from the thermally reversible solidification of electrolytes or ionic liquids and their superior ionic conductivity. To understand and to predict the properties of these systems it is important to get the knowledge about the interactions on molecular level between the solid gelator matrix and the electrolyte solution...
November 16, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27906009/current-trends-and-intricacies-in-the-management-of-hiv-associated-pulmonary-tuberculosis
#6
REVIEW
Narendran Gopalan, Padmapriyadarsini Chandrasekaran, Soumya Swaminathan, Srikanth Tripathy
Human immunodeficiency virus (HIV) epidemic has undoubtedly increased the incidence of tuberculosis (TB) globally, posing a formidable global health challenge affecting 1.2 million cases. Pulmonary TB assumes utmost significance in the programmatic perspective as it is readily transmissible as well as easily diagnosable. HIV complicates every aspect of pulmonary tuberculosis from diagnosis to treatment, demanding a different approach to effectively tackle both the diseases. In order to control these converging epidemics, it is important to diagnose early, initiate appropriate therapy for both infections, prevent transmission and administer preventive therapy...
September 26, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27894967/role-of-buffers-in-protein-formulations
#7
REVIEW
Teddy J Zbacnik, Ryan E Holcomb, Derrick S Katayama, Brian M Murphy, Robert W Payne, Richard C Coccaro, Gabriel J Evans, James E Matsuura, Charles S Henry, Mark Cornell Manning
Buffers comprise an integral component of protein formulations. Not only do they function to regulate shifts in pH, they also can stabilize proteins by a variety of mechanisms. The ability of buffers to stabilize therapeutic proteins whether in liquid formulations, frozen solutions or the solid state is highlighted in this review. Addition of buffers can result in increased conformational stability of proteins, whether by ligand binding or by an excluded solute mechanism. In addition they can alter the colloidal stability of proteins and modulate interfacial damage...
November 25, 2016: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27889293/stability-behaviour-of-antiretroviral-drugs-and-their-combinations-5-characterization-of-novel-degradation-products-of-abacavir-sulfate-by-mass-and-nuclear-magnetic-resonance-spectrometry
#8
Moolchand Kurmi, Archana Sahu, Saranjit Singh
In the present study, degradation behaviour of abacavir sulfate was evaluated in solution and solid stress conditions. Solution state studies resulted in formation of eleven degradation products; of which two were also formed on solid stress. The same were separated by high performance liquid chromatography. They were characterized using liquid chromatography-high resolution mass spectrometry, liquid chromatography-multistage mass spectrometry and hydrogen/deuterium exchange mass spectrometry data. Additionally, seven degradation products were isolated and subjected to 1D and 2D nuclear magnetic resonance studies for their structural confirmation...
November 5, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27888310/determination-of-trace-bisphenol-a-in-environmental-water-by-high-performance-liquid-chromatography-using-magnetic-reduced-graphene-oxide-based-solid-phase-extraction-coupled-with-dispersive-liquid-liquid-microextraction
#9
Danping Li, Xiaoguo Ma, Rui Wang, Yumian Yu
Bisphenol A (BPA), an endocrine-disrupting chemical, has received much attention from researchers and the general public. In this paper, a novel method of determining BPA at trace levels was developed, using magnetic reduced graphene oxide (rGO-Fe3O4)-based solid-phase extraction coupled with dispersive liquid-liquid microextraction (DLLME), followed by high-performance liquid chromatographic determination. The rGO-Fe3O4 was prepared and then characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and vibrating sample magnetometry...
November 25, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27887698/simultaneous-extraction-of-polycyclic-aromatic-hydrocarbons-through-the-complete-dissolution-of-solid-biological-samples-in-sodium-hydroxide-urea-thiourea-aqueous-solution
#10
Sedigheh Ale Mohammad, Kamal Ghanemi, Arash Larki
In order to precisely and simultaneously extract polycyclic aromatic hydrocarbons (PAHs) for measurement using a high performance liquid chromatography-fluorescence detector (HPLC-FL), a novel sample preparation method was developed. This method is based on the complete and fast dissolution of biological samples in a new non-alcoholic alkaline medium. A solution composed of NaOH/urea/thiourea at an optimized ratio was used for complete dissolution of approximately 0.25g dried fish samples within 20min. The proposed method was conducted at 10°C and under atmospheric pressure to obtain a stable and highly homogeneous solution, without the need for microwaves or any other apparatus...
December 9, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27886265/effect-of-a-weak-transverse-magnetic-field-on-the-microstructure-in-directionally-solidified-peritectic-alloys
#11
Xi Li, Zhenyuan Lu, Yves Fautrelle, Annie Gagnoud, Rene Moreau, Zhongming Ren
Effect of a weak transverse magnetic field on the microstructures in directionally solidified Fe-Ni and Pb-Bi peritectic alloys has been investigated experimentally. The results indicate that the magnetic field can induce the formation of banded and island-like structures and refine the primary phase in peritectic alloys. The above results are enhanced with increasing magnetic field. Furthermore, electron probe micro analyzer (EPMA) analysis reveals that the magnetic field increases the Ni solute content on one side and enhances the solid solubility in the primary phase in the Fe-Ni alloy...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885825/multiphase-fluid-solid-coupled-analysis-of-shock-bubble-stone-interaction-in-shockwave-lithotripsy
#12
K G Wang
A novel multiphase fluid-solid coupled computational framework is applied to investigate the interaction of a kidney stone immersed in liquid with a lithotripsy shock wave (LSW) and a gas bubble near the stone. The main objective is to elucidate the effects of a bubble in the shock path to the elastic and fracture behaviors of the stone. The computational framework couples a finite volume two-phase computational fluid dynamics (CFD) solver with a finite element (FE) computational solid dynamics (CSD) solver...
November 24, 2016: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/27885331/guided-growth-of-horizontal-p-type-znte-nanowires
#13
Gilad Reut, Eitan Oksenberg, Ronit Popovitz-Biro, Katya Rechav, Ernesto Joselevich
A major challenge toward large-scale integration of nanowires is the control over their alignment and position. A possible solution to this challenge is the guided growth process, which enables the synthesis of well-aligned horizontal nanowires that grow according to specific epitaxial or graphoepitaxial relations with the substrate. However, the guided growth of horizontal nanowires was demonstrated for a limited number of materials, most of which exhibit unintentional n-type behavior. Here we demonstrate the vapor-liquid-solid growth of guided horizontal ZnTe nanowires and nanowalls displaying p-type behavior on four different planes of sapphire...
August 4, 2016: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/27882676/highly-selective-coextraction-of-rhodamine-b-and-dibenzyl-phthalate-based-on-high-density-dual-template-imprinted-shells-on-silica-microparticles
#14
Zerong Long, Weiwei Xu, Yumei Peng, Yi Lu, Qian Luo, Hongdeng Qiu
A simple one-pot approach based on molecularly imprinted polymer shells dispersed on the surface of silica for simultaneous determination of rhodamine B and dibenzyl phthalate has been developed. Highly dense molecularly imprinted polymer shells were formed in the mixture of acetonitrile and toluene by the copolymerization of methacrylic acid and ethylene glycol dimethacrylate, as well as two templates, rhodamine B and dibenzyl phthalate, at the directing by the vinyl end groups functional monolayer at surface silica microspheres after 3-methacryloxypropyl trimethoxysilane modification...
November 24, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27876143/a-dispersive-liquid-liquid-microextraction-using-a-switchable-polarity-dispersive-solvent-automated-hplc-fld-determination-of-ofloxacin-in-chicken-meat
#15
Irina Timofeeva, Semen Timofeev, Leonid Moskvin, Andrey Bulatov
In this article, dispersive liquid-liquid microextraction (DLLME), based on the use of so-called switchable polarity dispersive solvent (SPDS) for microextraction, is presented for the first time. The new extraction technique makes use of a mixture of extraction solvent (dichloromethane) and the SPDS (acrylic acid). This mixture is injected into the aqueous sample solution, which was previously fortified with the alkaline agent (NaOH). The SPDS is dissolved in aqueous phase and a cloudy solution consisting of fine droplets of extraction solvent fully dispersed in the aqueous phase is observed...
January 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27875872/obtaining-the-solid-liquid-interfacial-free-energy-via-multi-scheme-thermodynamic-integration-ag-ethylene-glycol-interfaces
#16
Xin Qi, Ya Zhou, Kristen A Fichthorn
The solid-liquid interfacial free energy γsl is an important quantity in wetting, nucleation, and crystal growth. Although various methods have been developed to calculate γsl with atomic-scale simulations, such calculations still remain challenging for multi-component interfaces between molecular fluids and solids. We present a multi-scheme thermodynamic integration method that is inspired by the "cleaving-wall" method and aimed at obtaining γsl for such systems using open-source simulation packages. This method advances two aspects of its predecessor methods...
November 21, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27874136/a-self-quenching-resistant-carbon-nanodot-powder-with-multicolored-solid-state-fluorescence-for-ultra-fast-staining-of-various-representative-bacterial-species-within-one-minute
#17
Yongqiang Zhang, Chunfeng Li, Yi Fan, Chengbin Wang, Ruifu Yang, Xingyuan Liu, Lei Zhou
In this study, we prepared self-quenching-resistant solid-state fluorescent carbon nanodots (SFCDs) without any other solid matrices. The SFCDs were prepared using a one-step microwave synthesis method through precise control of the heating power and time. The resulting SFCD powder showed excitation-dependent emission behavior with a maximum fluorescence quantum yield of 40%. The multicolored SFCDs were successfully used as fluorescent agents for rapid staining of 14 representative bacterial species, including Gram-negative, Gram-positive, and acid-fast bacteria...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27866105/pilot-scale-removal-and-recovery-of-dissolved-phosphate-from-secondary-wastewater-effluents-with-reusable-znfezr-adsorbent-fe3o4-sio2-particles-with-magnetic-harvesting
#18
Asya Drenkova-Tuhtan, Michael Schneider, Matthias Franzreb, Carsten Meyer, Carsten Gellermann, Gerhard Sextl, Karl Mandel, Heidrun Steinmetz
Advanced nanocomposite magnetic particles functionalized with ZnFeZr-adsorbent are developed, characterized and tested for the removal and recovery of phosphate directly from spiked secondary wastewater effluent (∼10 mg/L PO4-P). The phosphate loaded particles can be extracted from the liquid phase via magnetic separation, regenerated in a NaOH solution where phosphate desorption takes place, and reused in numerous cycles. Laboratory experiments demonstrate their reusability and stability in 60 consecutive adsorption/desorption runs where under optimal conditions > 90% total P-recovery efficiency is reached...
November 14, 2016: Water Research
https://www.readbyqxmd.com/read/27865455/analysis-of-ustiloxins-in-rice-using-polymer-cation-exchange-cleanup-followed-by-liquid-chromatography-tandem-mass-spectrometry
#19
Zhao-Yun Cao, Li-Hua Sun, Ren-Xiang Mou, Xiao-Yan Lin, Rong Zhou, You-Ning Ma, Ming-Xue Chen
Ustiloxins are cyclopeptide mycotoxins produced by the pathogenic fungus Ustilaginoidea virens of rice false smut. Quantification of ustiloxins is essential to assess the food safety of rice infected by rice false smut disease. This paper describes a sensitive method for the simultaneous quantification of ustiloxins A, B, C, D and F in rice grains using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Since notable matrix enhancement effects (21%-78%) occurred for all of the target analytes (except for ustiloxin A), several solid phase extraction materials were tested for their ability to retain ustiloxins from aqueous solutions prior to the LC-MS/MS analysis, including C18 sorbents, polymer anion exchange sorbents resin (PAX), and polymer cation exchange resin (PCX)...
December 9, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27860282/in-situ-solvent-formation-microextraction-combined-with-magnetic-dispersive-micro-solid-phase-extraction-for-the-determination-of-benzoylurea-insecticides-in-water-samples
#20
Ying Zhang, Xiaoling Yang, Jiankang Wang, Wenfeng Zhou, Runhua Lu, Haixiang Gao, Sanbing Zhang
A simple, fast, effective and environmentally friendly method, in situ solvent formation microextraction combined with magnetic dispersive micro-solid-phase extraction for the determination of four benzoylurea insecticides is presented herein for the first time. In the proposed method, 1-hexyl-3-methylimidazolium bis[(trifluoromethane)sulfonyl]imide was formed by the reaction between 1-hexyl-3-methylimidazolium chloride and lithium bis[(trifluoromethane)sulfonyl]imide and was used to extract benzoylurea insecticides...
November 18, 2016: Journal of Separation Science
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