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https://www.readbyqxmd.com/read/28220763/exfoliation-of-black-phosphorus-in-ionic-liquids
#1
Miyeon Lee, Arup Kumer Roy, Seongho Jo, Yujin Choi, Ari Chae, Bongsoo Kim, Sung Yong Park, Insik In
We report the characterization and formation of sonication-assisted liquid phase exfoliation of bulk black phosphorus (BP) crystals with the incorporation of two representative ionic liquids (ILs) ([Emim][Tf2N] and [Bmim][Tf2N]) as green dispersing media was attempted, which resulted in stable dispersion of multi-layer BP flakes with unsuspected high oxidation resistance and chemical/structural integrity due to the presence of IL layer on top of BP flakes. There are two unveiled issues for the generation of BP dispersion in ILs...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28220761/electrically-tunable-terahertz-polarization-converter-based-on-overcoupled-metal-isolator-metal-metamaterials-infiltrated-with-liquid-crystals
#2
Borislav Vasić, Dimitrios C Zografopoulos, Goran Isić, Romeo Beccherelli, Radoš Gajić
Large birefringence and its electrical modulation by means of Fréedericksz transition makes nematic liquid crystals (LCs) a promising platform for tunable terahertz (THz) devices. The thickness of standard LC cells is in the order of the wavelength, requiring high driving voltages and allowing only a very slow modulation at THz frequencies. Here, we first present the concept of overcoupled metal-isolator-metal (MIM) cavities that allow for achieving simultaneously both very high phase difference between orthogonal electric field components and large reflectance...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28220757/photoexfoliation-of-two-dimensional-materials-through-continuous-uv-irradiation
#3
Wai-Chen Lin, Ming-Kai Chuang, Muchamed L Keshtov, Ganesh D Sharma, Fang-Chung Chen
This paper describes the preparation of fluorinated graphene nanosheets (FGNs) through photoexfoliation of fluorinated graphite (FG) in the liquid phase. We discovered that UV irradiation of FG dispersions in N-methyl-2-pyrolidone facilitated exfoliation to give FGNs. Transmission electron microscopy and atomic force microscopy revealed that the average thickness of the FGNs was approximately 3 nm; they were considerably thinner than the nanosheets prepared using a conventional sonication approach. Furthermore, when the FGNs were deposited uniformly onto substrates (through spin coating), they formed effective cathode interlayers for polymer solar cells (PSCs), the efficiency of which was 60% greater than that of PSCs containing FGNs prepared through ultrasonication...
February 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28219820/versatile-carboxyl-terminus-of-capsid-protein-of-porcine-circovirus-type-2-were-recognized-by-monoclonal-antibodies-with-pluripotency-of-binding
#4
Ling-Chu Hung, Ivan-Chen Cheng
We designed the peptide (C3) mimetic carboxyl-terminus (Cterminus) of capsid protein of porcine circovirus type 2b (PCV2b-1A/1B) inducing humoral immunity and generating hybridomas. The positive reactivity of the mAbs to PCV2 capsid protein was demonstrated by Western blot assay. Those mAbs also showed positive signals on PCV2b infected swine lymphocytes by indirect immunofluorescence staining. The mAb 1H3 bound to three minimal linear epitopes (P62, DPPLNP; P67, DPPLNPK; P73, LKDPPLKP), which was located at Cterminus of the capsid protein of PCV2b-1A/1B, PCV2b-1C, and PCV2a-2A respectively...
February 17, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28218678/adsorptive-desulfurization-of-model-gasoline-by-using-different-zn-sources-exchanged-nay-zeolites
#5
Jingwei Rui, Fei Liu, Rijie Wang, Yanfei Lu, Xiaoxia Yang
A series of Zn-modified NaY zeolites were prepared by the liquid-phase ion-exchange method with different Zn sources, including Zn(NO₃)₂, Zn(Ac)₂ and ZnSO₄. The samples were tested as adsorbents for removing an organic sulfur compound from a model gasoline fuel containing 1000 ppmw sulfur. Zn(Ac)₂-Y exhibited the best performance for the desulfurization of gasoline at ambient conditions. Combined with the adsorbents' characterization results, the higher adsorption capacity of Zn(Ac)₂-Y is associated with a higher ion-exchange degree...
February 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28217983/extraction-and-separation-of-lactate-dehydrogenase-inhibitors-from-poria-cocos-schw-wolf-based-on-a-hyphenated-technique-and-in-vitro-methods
#6
Sainan Li, Jianxu Zhang, Senlin Li, Chunming Liu, Shu Liu, Zhiqiang Liu
Stroke is one of the most common diseases worldwide. Lactate dehydrogenase inhibitors are widely used in the treatment of ischemic stroke, with natural products considered a promising source of lactate dehydrogenase inhibitors. In this study, ultrafiltration liquid chromatography coupled with mass spectrometry was used for the screening and identification of lactate dehydrogenase inhibitors from Poria cocos. Five lactate dehydrogenase inhibitors were selected: dehydropachymic acid, pachymic acid, dehydrotrametenolic acid, trametenolic acid, and eburicoic acid...
February 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28217979/enantioseparation-of-3-phenyllactic-acid-by-chiral-ligand-exchange-countercurrent-chromatography
#7
Shengqiang Tong, Xiaoping Wang, Mangmang Shen, Liqiong Lv, Mengxia Lu, Zhisi Bu, Jizhong Yan
3-Phenyllactic acid is an antimicrobial compound with broad-spectrum activity against various bacteria and fungus. The observed difference in pharmacological activity between optical isomeric 3-phenyllactic acid necessitates a method for enantioseparation. Chiral ligand exchange countercurrent chromatography was investigated for the enantioseparation of 3-phenyllactic acid with a synthesized chiral ligand. A two-phase solvent system was composed of n-butanol/hexane/water (0.4:0.6:1, v/v/v) to which N-n-dodecyl-l-hydroxyproline was added to the organic phase as chiral ligand and cupric acetate was added in the aqueous phase as a transitional metal ion...
February 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28217785/surfactant-free-microemulsions-of-1-butyl-3-methylimidazolium-hexafluorophosphate-propylamine-nitrate-and-water
#8
Jie Xu, Huanhuan Deng, Yunlei Fu, Yuquan Chen, Jing Zhang, Wanguo Hou
Generally, surfactants (or amphiphiles) are believed to be necessary components of microemulsions. However, it has been demonstrated that, in the absence of traditional surfactants, microemulsions can also form from a ternary system of two immiscible fluids (i.e., oil and water phases) and an amphi-solvent, but the current understanding of such surfactant-free microemulsions (SFMEs) is very limited. Herein, we report an SFME consisting of the hydrophobic ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6), the protic IL propylamine nitrate (PAN), and water, in which bmimPF6 and PAN are used as the oil phase and the amphi-solvent, respectively...
February 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28217560/core-shell-in-liquid-chromatography-application-for-determining-sulphonamides-in-feed-and-meat-using-conventional-chromatographic-systems
#9
Antonio Armentano, Simona Summa, Sonia Lo Magro, Pasquale D'Antini, Carmen Palermo, Marilena Muscarella
A C18 column packed with core-shell particles was used for the chromatographic separation of sulphonamides in feed and meat by a conventional high performance liquid chromatography system coupled with a diode array detector. Two analytical methods, already used in our laboratory, have been modified without any changes in the extraction and clean-up steps and in the liquid chromatography instrumentation. Chromatographic conditions applied on a traditional 5-µm column have been optimized on a column packed with 2...
September 20, 2016: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28216883/comparative-pharmacokinetic-profiles-of-three-protoberberine-type-alkaloids-from-raw-and-bile-processed-rhizoma-coptidis-in-heat-syndrome-rats
#10
Yuan Zi-Min, Chen Yue, Gao Hui, Lv Jia, Chen Gui-Rong, Jing Wang
BACKGROUND: The Bile-processed Rhizoma coptidis (BRC), which has a colder drug property than Rhizoma coptidis (RC), is widely used for the treatment of heat syndrome. We compared the pharmacokinetics of the protoberberine-type alkaloids in BRC and RC in rats with heat syndrome to elucidate the bile-processing mechanism. MATERIAL AND METHODS: We established a rapid and sensitive method for simultaneously determining three alkaloids: berberine, palmatine, and jatrorrhizine, in rat plasma based on ultra-performance liquid chromatography/tandem mass spectrometry...
January 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28215784/comparison-of-derivatization-ionization-techniques-for-liquid-chromatography-tandem-mass-spectrometry-analysis-of-oxylipins
#11
Sven W Meckelmann, Stefan Hellhake, Maryvonne Steuck, Michael Krohn, Nils Helge Schebb
The performance of two derivatization and ionization techniques for the quantitative reversed phase liquid chromatography (LC)- mass spectrometry (MS) analysis of hydroxy fatty acids (OH-PUFA) in plasma was evaluated: One used AMPP (N-(4-aminomethylphenyl)pyridinium chloride) leading to a positive charged amid-derivate which can be detected by electrospray ionization (ESI)-MS. Second yielded penta fluorobenzyl bromide (PFB) ester derivates allowing detection in electron capture atmospheric pressure chemical ionization (ecAPCI)-MS...
February 16, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28213708/removal-mechanisms-for-extremely-high-level-fluoroquinolone-antibiotics-in-pharmaceutical-wastewater-treatment-plants
#12
Xinyan Guo, Zheng Yan, Yi Zhang, Xiangji Kong, Deyang Kong, Zhengjun Shan, Na Wang
Pharmaceutical wastewater treatment plants (PWWTPs) receive industrial effluents from the plant that contain extremely high levels of antibiotics and are regarded as one of the major sources of antibiotics in the environment. Two PWWTPs have been selected in Zhejiang Province, China, to assess the removal mechanisms of fluoroquinolone antibiotics (FQs). PWWTP A uses activated sludge with biocarriers in a moving bed biofilm reactor in anoxic and aerobic units, and PWWTP B uses biological units under anaerobic, aerobic, and anoxic conditions...
February 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28213259/magnetic-non-magnetic-argan-press-cake-nanocellulose-for-the-selective-extraction-of-sudan-dyes-in-food-samples-prior-to-the-determination-by-capillary-liquid-chromatograpy
#13
Yassine Benmassaoud, María J Villaseñor, Rachid Salghi, Shehdeh Jodeh, Manuel Algarra, Mohammed Zougagh, Ángel Ríos
Two methods for the determination of Sudan dyes (Sudan I, Sudan II, Sudan III and Sudan IV) in food samples, by solid phase extraction - capillary liquid chromatography, are proposed. Both methods use nanocellulose (NC) extracted from bleached argan press cake (APC), as a nano-adsorbent recycled from an agricultural waste material. One of the methods involves the dispersion of NC in food sample extracts, along with the waste and eluents being separated by centrifugation. In the other method, NC was modified by magnetic iron nanoparticles before using it in the extraction of Sudan dyes...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213033/dynamic-predictive-model-for-growth-of-salmonella-spp-in-scrambled-egg-mix
#14
Lin Li, Jihan Cepeda, Jeyamkondan Subbiah, Glenn Froning, Vijay K Juneja, Harshavardhan Thippareddi
Liquid egg products can be contaminated with Salmonella spp. during processing. A dynamic model for the growth of Salmonella spp. in scrambled egg mix - high solids (SEM) was developed and validated. SEM was prepared and inoculated with ca. 2 log CFU/mL of a five serovar Salmonella spp. cocktail. Salmonella spp. growth data at isothermal temperatures (10, 15, 20, 25, 30, 35, 37, 39, 41, 43, 45, and 47 °C) in SEM were collected. Baranyi model was used (primary model) to fit growth data and the maximum growth rate and lag phase duration for each temperature were determined...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28211744/rescuing-a-quantum-phase-transition-with-quantum-noise
#15
Gu Zhang, E Novais, Harold U Baranger
We show that placing a quantum system in contact with an environment can enhance non-Fermi-liquid correlations, rather than destroy quantum effects, as is typical. The system consists of two quantum dots in series with two leads; the highly resistive leads couple charge flow through the dots to the electromagnetic environment, the source of quantum noise. While the charge transport inhibits a quantum phase transition, the quantum noise reduces charge transport and restores the transition. We find a non-Fermi-liquid intermediate fixed point for all strengths of the noise...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211639/the-use-of-on-line-heart-cutting-high-performance-liquid-chromatography-coupled-with-linear-ion-trap-mass-spectrometry-in-the-identification-of-impurities-in-vidarabine-monophosphate
#16
Hang Wang, Tongzhou Xu, Jiaojian Yuan
It is difficult to identify unknown impurities in nucleotide analogues by mass spectrometry because mass-spectrometry-incompatible mobile phases need to be used to separate the major ingredient from impurities. In this study, vidarabine monophosphate was selected, and unknown impurities were identified by online heart-cutting two-dimensional high performance liquid chromatography and linear ion trap mass spectrometry. The one dimensional reversed phase column was filled with a mobile phase containing non-volatile salt...
February 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28211335/a-comparative-study-of-extractant-and-chromatographic-phases-for-the-rapid-and-sensitive-determination-of-six-phthalates-in-rainwater-samples
#17
M Fernández-Amado, M C Prieto-Blanco, P López-Mahía, S Muniategui-Lorenzo, D Prada-Rodríguez
Six phthalic acid esters were determined in rainwater samples, from which a very low sample volume was collected. This method combines on-line in-tube solid-phase microextraction coupled to high-performance liquid chromatography with a diode-array detector. In order to obtain a short analysis time and to reduce the consumption of organic solvents, two chromatographic phases (C18 monolithic and cyanopropyl silica) are compared. Although three critical pairs are found, faster separation, good resolution and lower pressures are achieved using C18 monolithic column...
February 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28211324/aqueous-chlorination-of-fenamic-acids-kinetic-study-transformation-products-identification-and-toxicity-prediction
#18
Liyun Ma, Jian Li, Li Xu
Fenamic acids, one important type of non-steroidal anti-inflammatory drugs, are ubiquitous in environmental matrices. Thus it is of high significance to know the fate of them during chlorination disinfection considering their potential toxicity to the environment and humans. In the present study, the chlorination kinetics of three fenamic acids, i.e. mefenamic acid (MEF), tolfenamic acid (TOL) and clofenamic acid (CLO), were examined at different pHs, which followed second-order reaction under studied conditions...
February 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28210224/skin-mucus-of-gilthead-sea-bream-sparus-aurata-l-protein-mapping-and-regulation-in-chronically-stressed-fish
#19
Jaume Pérez-Sánchez, Genciana Terova, Paula Simó-Mirabet, Simona Rimoldi, Ole Folkedal, Josep A Calduch-Giner, Rolf E Olsen, Ariadna Sitjà-Bobadilla
The skin mucus of gilthead sea bream was mapped by one-dimensional gel electrophoresis followed by liquid chromatography coupled to high resolution mass spectrometry using a quadrupole time-of-flight mass analyzer. More than 2,000 proteins were identified with a protein score filter of 30. The identified proteins were represented in 418 canonical pathways of the Ingenuity Pathway software. After filtering by canonical pathway overlapping, the retained proteins were clustered in three groups. The mitochondrial cluster contained 59 proteins related to oxidative phosphorylation and mitochondrial dysfunction...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28209428/an-artificial-intelligence-based-improved-classification-of-two-phase-flow-patterns-with-feature-extracted-from-acquired-images
#20
C Shanthi, N Pappa
Flow pattern recognition is necessary to select design equations for finding operating details of the process and to perform computational simulations. Visual image processing can be used to automate the interpretation of patterns in two-phase flow. In this paper, an attempt has been made to improve the classification accuracy of the flow pattern of gas/ liquid two- phase flow using fuzzy logic and Support Vector Machine (SVM) with Principal Component Analysis (PCA). The videos of six different types of flow patterns namely, annular flow, bubble flow, churn flow, plug flow, slug flow and stratified flow are recorded for a period and converted to 2D images for processing...
February 13, 2017: ISA Transactions
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