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https://www.readbyqxmd.com/read/29680661/determination-of-fluoroquinolones-in-cattle-manure-based-biogas-residue-by-ultrasonic-enhanced-microwave-assisted-extraction-followed-by-online-solid-phase-extraction-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#1
Xue-Feng Lu, Yang Zhou, Jian Zhang, Yu-Peng Ren
The present work describes the development and application of an ultrasonic-enhanced microwave-assisted extraction (UEMAE) followed by online solid phase extraction (SPE)-ultra-high performance liquid chromatography-tandem mass spectrometry method for the analysis of 14 fluoroquinolones in cattle manure-based biogas residue (CMBBR). The UEMAE was performed using the mixed solution of sodium dihydrogen phosphate and disodium ethylenediamine tetraacetic acid, avoiding use of any organic solvent. The online SPE system employed two solid phase extraction columns in a parallel manner, and the extraction was performed by passing 1 mL of the extract through the column...
January 31, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29676918/template-assisted-proximity-for-oligomerization-of-fullerenes
#2
Kum-Yi Cheng, Shern-Long Lee, Ting-Yang Kuo, Chih-Hsun Lin, Yen-Chen Chen, Ting-Hao Kuo, Cheng-Chih Hsu, Chun-Hsien Chen
Demonstrated herein is an unprecedented porous template-assisted reaction at the solid-liquid interface involving bond formation, which is typically collision-driven and occurs in the solution and gas phases. The template is a TMA (trimesic acid) monolayer with two-dimensional pores that host fullerenes, which otherwise exhibit an insignificant affinity to an undecorated graphite substrate. The confinement of C84 units in the TMA pores formulates a proximity that is ideal for bond formation. The oligomerization of C84 is triggered by an electric pulse via an STM (scanning tunneling microscope) tip...
April 20, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29674096/kinetic-analysis-of-retention-of-so-2-using-waste-ulexite-ore-in-an-aqueous-medium
#3
Özlem Karagöz, Mehmet Çopur, M Muhtar Kocakerim
This study was carried out under atmospheric pressure and examined the kinetics of retention of SO2 , a toxic gas, by waste ulexite ore (WUO) from a boron concentration plant, as well as the kinetics of passing B2 O3 content of WUO to solution. The parameters of temperature, solid-to-liquid ratio, particle size, gas flow rate, and stirring speed were selected for the experiments carried out in a jacketted cylindirical glass reactor. The data on retention-dissolution and an XRD graph showed that SO2 had been captured as CaSO3 ·0...
April 4, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29673871/tailored-on-demand-anti-coagulant-dosing-an-in-vitro-and-in-vivo-evaluation-of-3d-printed-purpose-designed-oral-dosage-forms
#4
Basel Arafat, Nidal Qinna, Milena Cieszynska, Robert T Forbes, Mohamed A Alhnan
Coumarin therapy has been associated with high levels of inter- and intra-individual variation in the required dose to reach a therapeutic anticoagulation outcome. Therefore, a dynamic system that is able to achieve accurate delivery of a warfarin dose is of significant importance. Here we assess, the ability of 3D printing to fabricate and deliver tailored individualised precision dosing using an in-vitro model. Sodium warfarin loaded filaments were compounded using hot melt extrusion (HME) and further fabricated via fused deposition modelling (FDM) 3D printing to produce capsular-ovoid-shaped dosage forms loaded at 200 and 400 µg dose...
April 16, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29671070/determination-of-thiamethoxam-residues-in-banana-stem-and-fruit-through-lc-ms-ms
#5
A Suganthi, S A Nikita, J Kousika, K Bhuvaneswari, S Sridharan
An analytical method based on liquid chromatography coupled with mass spectroscopy/mass spectroscopy was developed and validated for the determination of thiamethoxam residues in banana fruit and stem tissue samples. In this study, Waters Alliance LC and Acquity TQD were used with an electrospray ionization interface in the positive ion mode. An isocratic flow of 0.5% HCOOH in water and 0.05% HCOOH in CH3 CN was used for separation. Thiamethoxam residue was extracted from the samples using CH3 CN and a dispersive solid-phase extraction method was used for subsequent cleanup...
April 18, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29669397/direct-detection-of-the-psychoactive-substance-mt-45-in-human-tissue-samples-by-probe-electrospray-ionization-tandem-mass-spectrometry
#6
Kiyotaka Usui, Tasuku Murata, Yuji Fujita, Yoshito Kamijo, Tomoki Hanazawa, Tomohiro Yoshizawa, Masato Funayama
Analyses of drugs and poisons in tissue samples are essential in forensic toxicology and pharmacology. However, current procedures for tissue analysis are laborious and time-consuming. Therefore, we assessed the utility of a newly devised probe electrospray ionization (PESI) technique with tandem mass spectrometry (MS/MS) for easy, ultra-rapid drug detection in human tissue samples. Using this system, typical pre-treatment procedures, such as solid-phase extraction, liquid-liquid extraction, deproteinization, or homogenization, can be avoided...
April 18, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29667816/nitrate-photochemistry-at-the-air-ice-interface-and-in-other-ice-reservoirs
#7
Alexander S McFall, Kasey C Edwards, Cort Anastasio
The photolysis of snowpack nitrate (NO3-) is an important source of gaseous reactive nitrogen species that affect atmospheric oxidants, particularly in remote regions. However, it is unclear whether nitrate photochemistry differs between the three solute reservoirs in/on ice: in liquid-like regions (LLRs) in the ice; within the solid ice matrix; and in a quasi-liquid layer (QLL) at the air-ice interface, where past work indicates photolysis is enhanced. In this work, we explore the photoformation of nitrite in these reservoirs using laboratory ices...
April 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29664608/cyclopentadithiophene-benzothiadiazole-donor-acceptor-polymers-as-prototypical-semiconductors-for-high-performance-field-effect-transistors
#8
Mengmeng Li, Cunbin An, Wojciech Pisula, Klaus Müllen
Donor-acceptor (D-A) conjugated polymers are of great interest as organic semiconductors, because they offer a rational tailoring of the electronic properties by modification of the donor and acceptor units. Nowadays, D-A polymers exhibit field-effect mobilities on the order of 10-2 -100 cm2 V-1 s-1 , while several examples showed a mobility over 10 cm2 V-1 s-1 . The development of cyclopentadithiophene-benzothiadiazole (CDT-BTZ) copolymers one decade ago represents an important step toward high-performance organic semiconductors for field-effect transistors...
April 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29659596/universal-expression-for-the-drag-on-a-fluid-sphere
#9
D A Barry, J-Y Parlange
An expression was developed for prediction of drag coefficients for any spherical particle, drop or bubble in an infinite, homogeneous liquid. The formula reproduces the limiting cases for gas bubbles and solid spheres, as well as the exact Hadamard-Rybczynski solution. The accuracy of the expression, which is valid for Reynolds numbers up to a few hundred, was confirmed by comparison with published numerical predictions of the drag coefficient for a range of physical circumstances.
2018: PloS One
https://www.readbyqxmd.com/read/29658544/aerosol-processing-a-wind-of-innovation-in-the-field-of-advanced-heterogeneous-catalysts
#10
REVIEW
Damien P Debecker, Solène Le Bras, Cédric Boissière, Alexandra Chaumonnot, Clément Sanchez
Aerosol processing is long known and implemented industrially to obtain various types of divided materials and nanomaterials. The atomisation of a liquid solution or suspension produces a mist of aerosol droplets which can then be transformed via a diversity of processes including spray-drying, spray pyrolysis, flame spray pyrolysis, thermal decomposition, micronisation, gas atomisation, etc. The attractive technical features of these aerosol processes make them highly interesting for the continuous, large scale, and tailored production of heterogeneous catalysts...
April 16, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29655724/solid-phase-extraction-with-high-polarity-carb-psa-as-composite-fillers-prior-to-uplc-ms-ms-to-determine-six-bisphenols-and-alkylphenols-in-trace-level-hotpot-seasoning
#11
Hao Dong, Xiaofang Zeng, Weidong Bai
The present study reports an ultra high-performance liquid chromatography tandem mass spectrometry method for the simultaneous determination of six bisphenols (bisphenol A, bisphenol B and bisphenol F) and alkylphenols (4-nonylphenol, 4-n-nonylphenol and octylphenol) in hotpot seasoning. Samples were dispersed in n-hexane after addition of internal standards bisphenol A-d4 and 4-n-nonylphenol-d4 . Sample solutions were then centrifuged, and the supernatants purified using solid phase extraction with high polarity Carb/PSA composite fillers...
August 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29651731/identification-of-sialic-acid-linkages-on-intact-glycopeptides-via-differential-chemical-modification-using-intactgig-hilic
#12
Shuang Yang, Wells W Wu, Rong-Fong Shen, Marshall Bern, John Cipollo
Mass spectrometric analysis of intact glycopeptides can reveal detailed information about glycosite, glycan structural features, and their heterogeneity. Sialyl glycopeptides can be positively, negatively, or neutrally charged depending on pH of their buffer solution and ionization conditions. To detect sialoglycopeptides, a negative-ion mode mass spectrometry may be applied with a minimal loss of sialic acids, although the positively charged or neutral glycopeptides may be excluded. Alternatively, the sialyl glycopeptides can be identified using positive-ion mode analysis by doping a high concentration of sodium salts to the analytes...
April 12, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29651479/spatially-dependent-dose-rate-in-liquid-cell-transmission-electron-microscopy
#13
Tanya Gupta, Nicholas M Schneider, Jeung Hun Park, Dan Steingart, Frances M Ross
The use of liquid cell electron microscopy as a quantitative probe of nanomaterial structures and reactions requires an accurate understanding of how the sample is altered by the imaging electron beam. In particular, changes in the chemical environment due to beam-induced radiolysis can strongly affect processes such as solution-phase nanocrystal synthesis or electrochemical deposition. It is generally assumed that beam effects are uniform throughout the irradiated liquid. Here we show that for a liquid cell filled with water, the inevitable presence of interfaces between water and the surrounding surfaces causes a spatial variation in the energy absorbed by the water near the walls...
April 13, 2018: Nanoscale
https://www.readbyqxmd.com/read/29650981/optical-characterization-of-surface-adlayers-and-their-compositional-demixing-at-the-nanoscale
#14
Limin Xiang, Michal Wojcik, Samuel J Kenny, Rui Yan, Seonah Moon, Wan Li, Ke Xu
Under ambient conditions, the behavior of a solid surface is often dominated by a molecularly thin adsorbed layer (adlayer) of small molecules. Here we develop an optical approach to unveil the nanoscale structure and composition of small-molecule adlayers on glass surfaces through spectrally resolved super-resolution microscopy. By recording the images and emission spectra of millions of individual solvatochromic molecules that turn fluorescent in the adlayer phase, we obtain ~30 nm spatial resolution and achieve concurrent measurement of local polarity...
April 12, 2018: Nature Communications
https://www.readbyqxmd.com/read/29648445/manipulating-femtoliter-to-picoliter-droplets-by-pins-for-single-cell-analysis-and-quantitative-biological-assay
#15
Xiao-Li Guo, Yan Wei, Qi Lou, Ying Zhu, Qun Fang
Herein, we developed an automated and flexible system for performing miniaturized liquid-liquid reactions and assays in the femtoliter to picoliter range, by combining the contact printing and the droplet-based microfluidics techniques. The system mainly consisted of solid pins and an oil-covered hydrophilic micropillar array chip fixed on an automated x- y- z translation stage. A novel droplet manipulation mode called "dipping-depositing-moving" (DDM) was proposed, which was based on the programmable combination of three basic operations, dipping liquids and depositing liquids with the solid pins and moving the two-dimensional oil-covered hydrophilic pillar microchip...
April 12, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29645033/ion-pairing-in-1-butyl-3-methylpyridinium-halide-ionic-liquids-studied-using-nmr-and-dft-calculations
#16
Vincent P Swamy, Hirekodathakallu V Thulasiram, Federico Rastrelli, Giacomo Saielli
We present the 1H, 13C and 15N NMR chemical shifts of bulk ionic liquids based on 1-butyl-3-methylimidazolium (the cation also known as 1-butyl-3-picolinium) halides (Cl-, Br- and I-) and tribromide (Br3-) salts. A characterization in solution of the analogous ICl2- and I3- salts is also reported. A series of DFT calculations has been run to predict the features of the NMR spectra of the pure ILs based on a few selected supramolecular ionic aggregates. To test the effect of temperature, and vibrational and conformational motions, only for the chloride salt, we also run first-principles molecular dynamics simulations of the ion pair in the gas phase, using the ADMP scheme (Atom Centered Density Matrix Propagation molecular dynamics model)...
April 12, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29642753/determination-of-olaquindox-carbadox-and-cyadox-in-animal-feeds-by-ultra-performance-liquid-chromatography-tandem-mass-spectrometry
#17
Xiaohuan Miao, Lijun Xu, Haipu Li, Zhaoguang Yang
Olaquindox, carbadox, and cyadox are chemically synthesized antibacterial and growth promoting agents for animals. At high doses they may exert mutagenicity and hepatic and adrenal toxicities in animals. Regrettably, these substances are frequently abused or misused when added into animal feeds. Thus, developing a sensitive and reliable method for simultaneous determination of olaquindox, carbadox, and cyadox in different kinds of animal feeds is crucially important for food safety monitoring. In this paper we optimized instrumental conditions, various extraction solutions, different kinds of solid phase extraction cartridges, and effects of pH on the loading solvents of the Oasis HLB cartridge...
April 12, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29628246/preparation-of-elastic-diglycolamic-acid-modified-chitosan-sponges-and-their-application-to-recycling-of-rare-earth-from-waste-phosphor-powder
#18
Ruixi Bai, Fan Yang, Yang Zhang, Zhigang Zhao, Qiuxia Liao, Peng Chen, Panpan Zhao, Wanghuan Guo, Chunqing Cai
Inspired by the phenomenon of sponges soaking up water, a novel syringe-like adsorption device used diglycolamic-acid modified chitosan sponges (CSs-DGAA) as adsorbents is reported for recycling of rare-earth elements (REEs) by Squeezing & Soaking (S&S) operation. Integrating the elasticity of sponges and selective extraction ability of diglycolamic acid groups, the new device can efficiently recycle REEs from aqueous solutions. This device only needs 10 min to achieve adsorption equilibrium; squeezing the water from the sponges achieves solid-liquid separation...
June 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29627345/a-spontaneous-binge-like-eating-model-in-mice-using-unpredictable-once-weekly-access-to-palatable-diets
#19
M Murphy, D J Dijkstra, J S Duncan, G W Horgan, J G Mercer
Many pre-clinical models of binge-like eating involve predictable, scheduled, access to a palatable diet high in fat (HF), where access may be preceded by anticipatory behaviour. Here, to introduce spontaneity into the binge-type consumption of palatable diets, mice were allowed 2 h access on a random day once per week and at a random time within an 8 h window either side of the transition from dark phase to light phase. Despite normal intake of a stock diet prior to unpredictable access to HF diet, mice immediately initiated a substantial eating episode when presented with HF diet...
April 5, 2018: Appetite
https://www.readbyqxmd.com/read/29620875/highly-adaptive-solid-liquid-interfacing-triboelectric-nanogenerator-for-harvesting-diverse-water-wave-energy
#20
Xue Jiao Zhao, Shuang Yang Kuang, Zhong Lin Wang, Guang Zhu
Harvesting water wave energy presents a significantly practical route to energy supply for self-powered wireless sensing network. Here we report a networked integrated triboelectric nanogenerators (NI-TENG) as a highly adaptive means of harvesting energy from interfacing interactions with various types of water wave. Having an arrayed networking structure, the NI-TENG can accommodate diverse water wave motions and generate stable electric output regardless of how random the water wave is. Nano-scaled surface morphology consisting of dense nanowire arrays is the key for obtaining high electric output...
April 5, 2018: ACS Nano
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