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https://www.readbyqxmd.com/read/29223092/treatment-of-dye-wastewater-using-an-ultrasonic-aided-nanoparticle-stacked-activated-carbon-kinetic-and-isotherm-modelling
#1
Ponnusamy Senthil Kumar, Sunita J Varjani, Subburaj Suganya
The present work explains the biosorption of malachite green dye from aquatic systems by nano zero valent iron stacked activated carbon (NZVI-AC), which was prepared by dual surface modification strategy. NZVI-AC was characterized by using FTIR, SEM-EDX, XRD and TGA. NZVI-AC exhibited efficient performance in dye biosorption properties. Experimental variables such as time, pH, dye concentration, temperature and biosorbent dosage influenced Langmuir adsorption capacity of 187.3 mg/g. The present biosorption system was best described by pseudo-first order kinetics...
December 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29210700/characterization-of-a-supported-ionic-liquid-membrane-used-for-the-removal-of-cyanide-from-wastewater
#2
Juan Qin Xue, Ni Na Liu, Guo Ping Li, Long Tao Dang
This work evaluated the performance of ionic liquids (ILs) in supported liquid membranes in the removal of total cyanide from wastewater. Membranes were characterized by scanning electron microscopy and contact angle measurements to study the membrane morphology and wetting ability. In particular, the effects of operational parameters such as membrane immersion time, feed-phase concentration, and pH on cyanide removal were investigated. ILs are organic salts that are entirely composed of organic cations and either organic or inorganic anions...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29210575/phase-separation-behavior-of-supercharged-proteins-and-polyelectrolytes
#3
Chad S Cummings, Allie C Obermeyer
Membraneless organelles, like membrane-bound organelles, are essential to cell homeostasis and provide discrete cellular sub-compartments. Unlike classical organelles, membraneless organelles possess no physical barrier, but rather arise by phase separation of the organelle components from the surrounding cytoplasm or nucleoplasm. Complex coacervation, the liquid-liquid phase separation of oppositely charged polyelectrolytes, is one of several phenomena that is hypothesized to drive the formation and regulation of some membraneless organelles...
December 6, 2017: Biochemistry
https://www.readbyqxmd.com/read/29210563/thermally-responsive-capillary-suspensions
#4
Anupam A K Das, Timothy S Dunstan, Simeon D Stoyanov, Pierre Starck, Vesselin N Paunov
We demonstrate that stimulus-responsive capillary-structured materials can be formed from hydrophobized calcium carbonate particles suspended in a non-polar phase (silicone oil) and bridged by very small amounts of a hydrogel as the secondary aqueous phase. Inclusion of thermally responsive polymers into the aqueous phase yielded a capillary-structured suspension whose rheology is controlled by a change in temperature and can increase its complex modulus by several orders of magnitude because of the gelation of the capillary bridges between the solid particles...
December 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29205550/co-structure-directing-effect-in-ionothermal-synthesis-of-extra-large-pore-aluminophosphate-zeotype-with-clo-topology
#5
Yutong Lin, Ling Zhang, Ke Guo, Miao Wang, Ying Wei
Ionothermal synthesis of extra-large pore aluminophosphate zeotype with -CLO topological structure, DNL-1, was studied using 1,6-hexanediamine and several quaternary ammonium compounds with different types of cations and anions as co-structure-directing agent (co-SDA). Phase selectivity and crystallization process were comparatively investigated, showing that the crystallization of -CLO structure as well as LTA structure was correlated with the alkalinity and concentration rather than structure of co-SDA. Combining solid/solution 13C NMR and other characterizations on DNL-1 obtained with different co-SDAs, it was demonstrated that ionic liquid cation was unalterably occluded in the structure, while the occlusion of co-SDA cation was not imperative...
December 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29202362/multi-residue-analysis-of-sedative-drugs-in-human-plasma-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#6
Liqun Zhang, Pinggu Wu, Quan Jin, Zhengyan Hu, Junlin Wang
BACKGROUND: Sedative drugs are often used for the treatment of depression, anxiety and insomnia and they are involved in many forensic cases. This work established a method for the simultaneous determination of multi-groups of sedative drugs (benzodiazepines, barbitals, phenothiazines, tricyclic antidepressant and butyrophenone) in human plasma for forensic analysis. A large number of sedative drugs with forensic interest can be analyzed in a short time with lower limits of quantification by combination of SPE extraction and ultra performance liquid chromatography-tandem mass spectrometry...
November 28, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29202218/biocompatible-amphiphilic-hydrogel-solid-dimer-particles-as-colloidal-surfactants
#7
Dong Chen, Esther Amstad, Chun-Xia Zhao, Liheng Cai, Jing Fan, Qiushui Chen, Mingtan Hai, Stephan Koehler, Huidan Zhang, Fuxin Liang, Zhenzhong Yang, David A Weitz
Emulsions of two immiscible liquids can slowly coalesce over time when stabilized by surfactant molecules. Pickering emulsions stabilized by colloidal particles can be much more stable. Here, we fabricate biocompatible amphiphilic dimer particles using a hydrogel, a strongly hydrophilic material, and achieve large contrast in the wetting properties of the two bulbs, resulting in enhanced stabilization of emulsions. We generate monodisperse single emulsions of alginate and shellac solution in oil using a flow-focusing microfluidics device...
December 4, 2017: ACS Nano
https://www.readbyqxmd.com/read/29199825/unusual-aggregation-arrangement-of-eu-containing-polyoxometalate-hybrid-in-a-protic-ionic-liquid-with-improved-luminescence-property
#8
Nana Lei, Sijing Yi, Jiao Wang, Qintang Li, Xiao Chen
Hybridization of polyoxometalates (POMs) with cationic surfactants offers the opportunity to greatly improve their functionalities as well as processabilities. Here, a surfactant-encapsulated Eu-containing POM complex (SEP) was formed via electrostatic interaction between 1-octadecyl-3-methylimidazolium bromide (OB) and Na9(EuW10O36)•32H2O (EuW10). SEP was firstly self-assembled in a protic ionic liquid to prepare the soft aggregates to fundamentally avoid the fluorescence quenching by water molecules. The structures and photophysical properties of SEP or aggregates were investigated thoroughly by NMR and FTIR spectroscopy, optical and electron microscopy, small-angle X-ray scattering and fluorescence measurements...
December 4, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29198983/concentration-dependent-supramolecular-patterns-of-c3-and-c2-symmetric-molecules-at-the-solid-liquid-interface
#9
Mohamed El Garah, Timothy R Cook, Hajar Sepehrpour, Artur Ciesielski, Peter J Stang, Paolo Samorì
Here we report on a scanning tunnelling microscopy (STM) investigation on the self-assembly of C3- and C2-symmetric molecules at the solution/graphite interface. 1,3,5-tris((E)-2-(pyridin-4-yl)vinyl)benzene and 1,1,2,2-tetrakis(4-(pyridin-4-yl)phenyl)ethane are used as model systems. These molecules displayed a concentration dependent self-assembly behaviour on graphite, resulting in highly ordered supramolecular structures, which are stabilized jointly by van der Waals substrate-adsorbate interactions and in-plane intermolecular H-bonding...
November 28, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29193969/synthesis-and-study-at-a-solid-liquid-interface-of-porphyrin-dimers-linked-by-metal-ions
#10
Mary-Ambre Carvalho, Hervé Dekkiche, Lydia Karmazin, Fabien Sanchez, Bruno Vincent, Masatoshi Kanesato, Yoshihiro Kikkawa, Romain Ruppert
Several porphyrin dimers linked by metal ions were prepared. One trimeric compound was also isolated and one porphyrin dimer linked by palladium(II) could be structurally characterized. In solution, the size of the new compounds was estimated by DOSY NMR techniques. These compounds all contained long aliphatic chains (O-C12H25), which were used to assemble them at a highly oriented pyrolytic graphite (HOPG)/liquid interface. The highly ordered arrays were visualized by scanning tunneling microscopy (STM).
December 1, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29190067/matrix-sputtering-method-a-novel-physical-approach-for-photoluminescent-noble-metal-nanoclusters
#11
Yohei Ishida, Ryan D Corpuz, Tetsu Yonezawa
Noble metal nanoclusters are believed to be the transition between single metal atoms, which show distinct optical properties, and metal nanoparticles, which show characteristic plasmon absorbance. The interesting properties of these materials emerge when the particle size is well below 2 nm, such as photoluminescence, which has potential application particularly in biomedical fields. These photoluminescent ultrasmall nanoclusters are typically produced by chemical reduction, which limits their practical application because of the inherent toxicity of the reagents used in this method...
November 30, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29184989/enhanced-avermectin-production-by-streptomyces-avermitilis-atcc-31267-using-high-throughput-screening-aided-by-fluorescence-activated-cell-sorting
#12
Xiaomei Cao, Zhengshan Luo, Weizhu Zeng, Sha Xu, Liqing Zhao, Jingwen Zhou
Avermectins, produced by Streptomyces avermitilis, are important antiparasitic agents. The use of traditional microbial breeding methods for this organism has been limited by the low-throughput shake flask-based screening process. The unique growth cycle of actinomycetes makes the establishment of a reliable high-throughput screening (HTS) process difficult. To enhance the efficiency of screening strains with high yields of avermectin, a HTS process aided by fluorescence-activated cell sorting (FACS) was established...
November 29, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29183147/development-and-optimization-of-sulforaphane-loaded-nanostructured-lipid-carriers-by-the-box-behnken-design-for-improved-oral-efficacy-against-cancer-in-vitro-ex-vivo-and-in-vivo-assessments
#13
Kriti Soni, Md Rizwanullah, Kanchan Kohli
In the present study, sulforaphane (SFN)-loaded nanostructured lipid carriers (NLC) were developed and optimized for improved oral efficacy against cancer. The SFN-loaded NLC formulation was developed by melt emulsification ultrasonication technique and optimized by Box-Behnken statistical design. The optimized SFN-loaded NLC formulation composed of precirol® ATO 5 (solid lipid) and vitamin E (liquid lipid) as lipid phase (3% w/v), poloxamer 188 (1%) and Tween 80 (1%) as surfactant. The mean particle size, polydispersity index, zeta potential, entrapment efficiency (%) and drug loading (%) of optimized SFN-loaded NLC formulation was observed to be 145...
November 28, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29182997/bioanalytical-methods-for-the-quantification-of-hydromorphone-fentanyl-norfentanyl-morphine-morphine-3%C3%A3-glucuronide-and-morphine-6%C3%A3-glucuronide-in-human-plasma
#14
Peter de Bruijn, Evelien J M Kuip, Mei-Ho Lam, Ron H J Mathijssen, Stijn L W Koolen
The aim of this study was to develop an assay for the quantification of hydromorphone, morphine, fentanyl and the metabolites norfentanyl, morphine-3ß-glucuronide and morphine-6ß-glucuronide in human plasma to support pharmacokinetic studies investigating the large interpatient variability in response to opioid treatment. For the quantitation of hydromorphone, morphine, fentanyl and its metabolite norfentanyl aliquots of 200μL human potassium EDTA plasma were deproteinized with deuterated internal standards in a mixture of acetonitrile and acetone, followed by a liquid-liquid extraction with 4% ammonium hydroxide and ethyl acetate...
November 17, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29182853/role-of-precursor-conversion-chemistry-in-the-crystal-phase-control-of-catalytically-grown-colloidal-semiconductor-quantum-wires
#15
Fudong Wang, William E Buhro
Crystal-phase control is one of the most challenging problems in nanowire growth. We demonstrate that in the solution-phase, catalyzed growth of colloidal cadmium telluride (CdTe) quantum wires (QWs), the crystal phase can be controlled by manipulating the reaction chemistry of the Cd precursors and tri-n-octylphosphine telluride (TOPTe) to favor the production of either a CdTe solute or Te, which consequently determines the composition and (liquid or solid) state of the BixCdyTez catalyst nanoparticles. Growth of single-phase (e...
November 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/29181973/selective-separation-and-pre-concentration-of-scandium-with-mesoporous-silica
#16
Simon Giret, Yimu Hu, Nima Masoumifard, Jean-Francois Boulanger, Estelle Juère, Freddy Kleitz, Dominic Larivière
Separation and pre-concentration of scandium (Sc) were successfully achieved using a mesoporous silica support that showed good selectivity for this element. Unmodified mesoporous silica materials were used as an extracting medium in a solid-liquid extraction (SLE) process. Selectivity, extraction capacity, kinetic of extraction and reusability under acidic conditions were investigated. The results demonstrate the potential of unmodified mesoporous silica materials for the selective separation and pre-concentration of Sc...
November 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29179808/ultrasound-assisted-extraction-of-anthocyanins-from-red-rose-petals-and-new-spectrophotometric-methods-for-the-determination-of-total-monomeric-anthocyanins
#17
Mahmure Üstün Özgür, Emrah Çimen
In this study, four extraction technologies for the extraction of anthocyanins (Acyns) from red rose petals (RRPs) were investigated and compared, including ultrasound-assisted extraction (UAE), reflux extraction, Soxhlet extraction, and marinated extraction. UAE was the most suitable for the extraction of Acyns from RRPs because of its high extraction efficiency and short extraction time. The results showed that the best conditions for UAE are an extraction solution of ethanol–0.1 N HCl (80 + 20, v/v), a solid-to-liquid ratio of 1:40 g/mL, a temperature of 30°C, and an extraction time of 15 min performed three times...
November 28, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29176756/cryogenic-3d-printing-of-super-soft-hydrogels
#18
Zhengchu Tan, Cristian Parisi, Lucy Di Silvio, Daniele Dini, Antonio Elia Forte
Conventional 3D bioprinting allows fabrication of 3D scaffolds for biomedical applications. In this contribution we present a cryogenic 3D printing method able to produce stable 3D structures by utilising the liquid to solid phase change of a composite hydrogel (CH) ink. This is achieved by rapidly cooling the ink solution below its freezing point using solid carbon dioxide (CO2) in an isopropanol bath. The setup was able to successfully create 3D complex geometrical structures, with an average compressive stiffness of O(1) kPa (0...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29174132/development-of-magnetic-dispersive-solid-phase-extraction-using-toner-powder-as-an-efficient-and-economic-sorbent-in-combination-with-dispersive-liquid-liquid-microextraction-for-extraction-of-some-widely-used-pesticides-in-fruit-juices
#19
Mir Ali Farajzadeh, Ali Mohebbi
In this study, for the first time, a magnetic dispersive solid phase extraction method using an easy-accessible, cheap, and efficient magnetic sorbent (toner powder) combined with dispersive liquid-liquid microextraction has been developed for the extraction and preconcentration of some widely used pesticides (diazinon, ametryn, chlorpyrifos, penconazole, oxadiazon, diniconazole, and fenazaquin) from fruit juices prior to their determination by gas chromatography-flame ionization detection. In this method, the magnetic sorbent is mixed with an appropriate dispersive solvent (methanol-water, 80:20, v/v) and then injected into an aqueous sample containing the analytes...
November 22, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29164891/unexpected-solubility-enhancement-of-drug-bases-in-presence-of-a-dimethylaminoethyl-methacrylate-copolymer
#20
Wiebke Saal, Alfred Ross, Nicole Wyttenbach, Jochem Alsenz, Martin Kuentz
The methacrylate-copolymer Eudragit® EPO (EPO) has previously shown to greatly enhance solubilization of acidic drugs via ionic interactions and by multiple hydrophobic contacts with polymeric side chains. The latter type of interaction could also play a role for solubilization of other compounds than acids. The aim of this study was therefore to investigate the solubility of six poorly soluble bases in presence and absence of EPO by quantitative ultra-pressure liquid chromatography with concomitant X-ray powder diffraction (XRPD) analysis of the solid state...
November 22, 2017: Molecular Pharmaceutics
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