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https://www.readbyqxmd.com/read/28346886/simultaneous-determination-of-amitraz-chlordimeform-formetanate-and-their-main-metabolites-in-human-urine-by-high-performance-liquid-chromatography-tandem-mass-spectrometry
#1
Xue Gao, Yanglan Tan, Hao Guo
A rapid, simple and reliable high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was developed for simultaneous determination of amitraz, chlordimeform, formetanate and their main metabolites, N-(2,4-dimethylphenyl)-N-methyl-formamidine (DMPF), 2,4-dimethylformamidine (DMF), 2,4-dimethylaniline (DMA), 4-chloro-2-methylaniline and 3-hydroxyacetanilide in human urine. The urine samples were mixed with buffer solutions (pH 8) and subsequently cleaned up by solid supported liquid/liquid extraction (SLE)...
March 11, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28345934/amphiphilic-nucleating-agents-to-enhance-calcium-phosphate-growth-on-polymeric-surfaces
#2
Laura Caetano Escobar da Silva, Bruna Antunes Más, Eliana Aparecida de Rezende Duek, Richard Landers, Celso Aparecido Bertran, Maria Do Carmo Goncalves
Poly(ɛ-caprolactone) (PCL) is an aliphatic polyester widely explored in the preparation of guided bone regeneration (GBR) membranes due to its interesting mechanical properties and biodegradability. However, PCL high hydrophobicity often impairs cell adhesion and proliferation as well as calcium phosphate growth, all of which are crucial to achieve suitable bone-tissue integration. In this work, aiming to achieve less hydrophobic surfaces, amphiphilic molecules were added at low concentrations to the polymeric dope solutions that generated the GBR membranes...
March 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28344357/quantum-dot-surface-engineering-toward-inert-fluorophores-with-compact-size-and-bright-stable-emission
#3
Sung Jun Lim, Liang Ma, André Schleife, Andrew M Smith
The surfaces of colloidal nanocrystals are complex interfaces between solid crystals, coordinating ligands, and liquid solutions. For fluorescent quantum dots, the properties of the surface vastly influence the efficiency of light emission, stability, and physical interactions, and thus determine their sensitivity and specificity when they are used to detect and image biological molecules. But after more than 30 years of study, the surfaces of quantum dots remain poorly understood and continue to be an important subject of both experimental and theoretical research...
August 1, 2016: Coordination Chemistry Reviews
https://www.readbyqxmd.com/read/28342961/particulate-metal-bioaccessibility-in-physiological-fluids-and-cell-culture-media-toxicological-perspectives
#4
Bérénice Leclercq, Laurent Yves Alleman, Esperanza Perdrix, Véronique Riffault, Mélanie Happillon, Alain Strecker, Jean-Marc Lo-Guidice, Guillaume Garçon, Patrice Coddeville
According to the literature, tiny amounts of transition metals in airborne fine particles (PM2.5) may induce proinflammatory cell response through reactive oxygen species production. The solubility of particle-bound metals in physiological fluids, i.e. the metal bioaccessibility is driven by factors such as the solution chemical composition, the contact time with the particles, and the solid-to-liquid phase ratio (S/L). In this work, PM2.5-bound metal bioaccessibility was assessed in various physiological-like solutions including cell culture media in order to evidence the potential impact on normal human bronchial epithelial cells (NHBE) when studying the cytotoxicity and inflammatory responses of PM2...
March 23, 2017: Environmental Research
https://www.readbyqxmd.com/read/28340787/determination-of-ammonia-nitrogen-in-solid-and-liquid-high-complex-matrices-using-one-step-gas-diffusion-microextraction-and-fluorimetric-detection
#5
Inês M Valente, Hugo M Oliveira, Carlos D Vaz, Rui M Ramos, António J M Fonseca, Ana R J Cabrita, José A Rodrigues
This paper introduces a new method for a one-step determination of ammonia nitrogen (NH3) in high complex solid and liquid samples from the agricultural and livestock sectors. To this end, we developed a simultaneous extraction and fluorimetric labeling of NH3, using gas diffusion microextraction (GDME), followed by the fluorescence measurement under 96-well microplate format. The GDME ensured a selective diffusion of NH3 through a commercial hydrophobic membrane, and confined the acceptor solution, which included the fluorimetric labeling reagent o-phthalaldehyde (OPA)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340702/selective-solid-phase-extraction-of-jwh-synthetic-cannabinoids-by-using-computationally-designed-peptides
#6
Marcello Mascini, Camilla Montesano, German Perez, Joseph Wang, Dario Compagnone, Manuel Sergi
The objective of the present work is to demonstrate a rational way to prepare selective sorbents able to extract simultaneously several structural analogs. For this purpose the binding specificity of two hexapeptides computationally designed (VYWLVW and YYIGGF) versus four synthetic cannabinoids Naphthalen-1-yl-(1-pentylindol-3-yl)methanone (JWH 018), naphthalen-1-yl-(1-butylindol-3-yl)methanone (JWH 073), (R)-(1-((1-methylpiperidin-2-yl)methyl)-1H-indol-3-yl)(naphthalen-1-yl)methanone (AM 1220) and (R)-(+)-[2,3-Dihydro-5-methyl-3-(4-morpholinylmethyl)pyrrolo[1,2,3-de]-1,4-benzoxazin-6-yl]-1-napthalenylmethanone (WIN 55) was computationally studied and then experimentally tested by solid-phase extraction (SPE) clean-up and ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28336867/synthesis-of-multicolor-core-shell-naluf%C3%A2-yb-3-ln-3-caf%C3%A2-upconversion-nanocrystals
#7
Hui Li, Shuwei Hao, Chunhui Yang, Guanying Chen
The ability to synthesize high-quality hierarchical core/shell nanocrystals from an efficient host lattice is important to realize efficacious photon upconversion for applications ranging from bioimaging to solar cells. Here, we describe a strategy to fabricate multicolor core @ shell α-NaLuF₄:Yb(3+)/Ln(3+)@CaF₂ (Ln = Er, Ho, Tm) upconversion nanocrystals (UCNCs) based on the newly established host lattice of sodium lutetium fluoride (NaLuF₄). We exploited the liquid-solid-solution method to synthesize the NaLuF₄ core of pure cubic phase and the thermal decomposition approach to expitaxially grow the calcium fluoride (CaF₂) shell onto the core UCNCs, yielding cubic core/shell nanocrystals with a size of 15...
February 7, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28334987/magnetic-solid-phase-extraction-of-n-n-diethyl-m-toluamide-from-baby-toilet-water-prior-to-its-hplc-uv-detection
#8
Xiaowei Ma, Fan Feng, Yang Yang, Xueping Dang, Jianlin Huang, Huaixia Chen
Fe3O4@MIL-100 (MIL, Material Institut Lavoisier) core-shell magnetic microspheres were prepared and applied as the sorbent for the magnetic solid phase extraction (MSPE) of N,N-diethyl-m-toluamide (DEET) in baby toilet water for the first time. The synthesized magnetic metal-organic frameworks were characterized by transmission electron microscope, infrared spectroscopy and thermogravimetric analysis. The functionalized magnetic microparticles showed excellent dispersibility in aqueous solution. The MSPE conditions were investigated in detail...
March 3, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28334920/spe-hplc-determination-of-chlorogenic-and-phenolic-acids-in-coffee
#9
Pelin Köseoglu Yilmaz, Ufuk Kolak
A new solid phase extraction-high-performance liquid chromatography method with ultraviolet detection was developed and validated for the determination of three chlorogenic acids (5-O-caffeoylquinic, 3-O-caffeoylquinic and 4-O-caffeoylquinic acids) and six phenolic acids (caffeic, ferulic, sinapic, protocatechuic, p-hydroxybenzoic acid (PHBA) and vanillic acid (VA)) in coffee bean samples. Extraction was performed using hydrophilic-lipophilic balance cartridges. Separations were accomplished using a C18 guard column (10 × 2...
March 18, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28327718/can-charged-colloidal-particles-increase-the-thermoelectric-energy-conversion-efficiency
#10
Thomas J Salez, Bo Tao Huang, Maud Rietjens, Marco Bonetti, Cécile Wiertel-Gasquet, Michel Roger, Cleber Lopes Filomeno, Emmanuelle Dubois, Régine Perzynski, Sawako Nakamae
Currently, liquid thermocells are receiving increasing attention as an inexpensive alternative to conventional solid-state thermoelectrics for low-grade waste heat recovery applications. Here we present a novel path to increase the Seebeck coefficient of liquid thermoelectric materials using charged colloidal suspensions; namely, ionically stabilized magnetic nanoparticles (ferrofluids) dispersed in aqueous potassium ferro-/ferri-cyanide electrolytes. The dependency of thermoelectric potential on experimental parameters such as nanoparticle concentration and types of solute ions (lithium citrate and tetrabutylammonium citrate) is examined to reveal the relative contributions from the thermogalvanic potential of redox couples and the entropy of transfer of nanoparticles and ions...
March 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28323413/designing-morphology-in-epitaxial-silicon-nanowires-the-role-of-gold-surface-chemistry-and-phosphorus-doping
#11
Seokhyoung Kim, David J Hill, Christopher W Pinion, Joseph D Christesen, James R McBride, James F Cahoon
Vertically aligned semiconductor nanowires (NWs) have many potential applications for NW-based technologies, ranging from solar cells to intracellular sensors. Aligned NWs can be fabricated by top-down etching of planar wafers or synthesized from the bottom up using the vapor-liquid-solid (VLS) mechanism to induce epitaxial growth on lattice-matched substrates. The VLS process permits the modulation of dopants along the NW growth axis, which if combined with dopant-dependent wet-chemical etching, can be used to encode precise morphology...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28319845/surface-transport-processes-in-charged-porous-media
#12
Jorge Gabitto, Costas Tsouris
Surface transport processes are very important in chemistry, colloidal sciences, engineering, biology, and geophysics. Natural or externally produced charges on surfaces create electrical double layers (EDLs) at the solid-liquid interface. The existence of the EDLs produces several complex processes including bulk and surface transport of ions. In this work, a model is presented to simulate bulk and transport processes in homogeneous porous media comprising big pores. It is based on a theory for capacitive charging by ideally polarizable porous electrodes without Faradaic reactions or specific adsorption of ions...
March 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28319373/morphology-controllable-synthesis-of-zn-co-mixed-sulfide-nanostructures-on-carbon-fiber-paper-toward-efficient-rechargeable-zinc-air-batteries-and-water-electrolysis
#13
Xiaoyu Wu, Xiaopeng Han, Xiaoya Ma, Wei Zhang, Yida Deng, Cheng Zhong, Wenbin Hu
It remains an ongoing challenge to develop cheap, highly active, and stable electrocatalysts to promote the sluggish electrocatalytic oxygen evolution, oxygen reduction, and hydrogen evolution reactions for rechargeable metal-air batteries and water-splitting systems. In this work, we report the morphology-controllable synthesis of zinc cobalt mixed sulfide (Zn-Co-S) nanoarchitectures, including nanosheets, nanoplates, and nanoneedles, grown on conductive carbon fiber paper (CFP) and the micronanostructure dependent electrochemical efficacy for catalyzing hydrogen and oxygen in zinc-air batteries and water electrolysis...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28304060/bio-inspired-hybrid-nanoparticles-promote-vascularized-bone-regeneration-in-a-morphology-dependent-manner
#14
Gaojie Yang, Haoming Liu, Xixi Hu, Zetao Chen, Thor E Friis, Jianglin Wang, Yin Xiao, Shengmin Zhang
Current major obstacles for translating the nanoparticle (NP) morphology-related function into therapeutic purposes come from the challenges in understanding the mechanisms that determine cell lineage commitment and constructing a NP-based 3D functional structure, and few studies have successfully demonstrated clear evidence of regulating in vivo tissue regeneration by NP morphology so far. Here, we show that nanoparticle geometry can be harnessed to mediate bone regeneration in a rat cranial defect model. We successfully synthesized hydroxyapatite NPs with well-defined morphologies using a modified liquid-solution-solid (LSS) method...
March 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28304018/graphene-nanobubbles-on-tio2-for-in-operando-electron-spectroscopy-of-liquid-phase-chemistry
#15
S Nappini, A Matruglio, D Naumenko, S Dal Zilio, F Bondino, M Lazzarino, E Magnano
X-Ray Photoelectron Spectroscopy (XPS) and X-Ray Absorption Spectroscopy (XAS) provide unique knowledge on the electronic structure and chemical properties of materials. Unfortunately this information is scarce when investigating solid/liquid interfaces and chemical or photochemical reactions under ambient conditions because of the short electron inelastic mean free path (IMFP) that requires a vacuum environment, which poses serious limitation on the application of XPS and XAS to samples present in the atmosphere or in the presence of a solvent...
March 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28296415/proton-transfer-mechanisms-at-the-water-zno-interface-the-role-of-presolvation
#16
Vanessa Quaranta, Matti Hellström, Jörg Behler
The dissociation of water is an important step in many chemical processes at solid surfaces. In particular, water often spontaneously dissociates near metal oxide surfaces, resulting in a mixture of H2O, H(+), and OH(-) at the interface. Ubiquitous proton-transfer (PT) reactions cause these species to dynamically interconvert, but the underlying mechanisms are poorly understood. Here, we develop and use a reactive high-dimensional neural-network potential based on density functional theory data to elucidate the structural and dynamical properties of the interfacial species at the liquid-water-metal-oxide interface, using the nonpolar ZnO(101̅0) surface as a prototypical case...
March 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28294964/alginate-based-composite-sponges-as-gastroretentive-carriers-for-curcumin-loaded-self-microemulsifying-drug-delivery-systems
#17
Arpa Petchsomrit, Namfa Sermkaew, Ruedeekorn Wiwattanapatapee
Alginate-based composite sponges were developed as carriers to prolong the gastric retention time and controlled release of curcumin-loaded self-microemulsifying drug delivery systems (Cur-SMEDDS). Liquid Cur-SMEDDS was incorporated into a solution made up of a mixture of polymers and converted into a solid form by freeze-drying. The ratio of alginate as the main polymer, adsorbent (colloidal silicon dioxide), and additional polymers-sodium carboxymethyl cellulose (SCMC), hydroxypropyl methylcellulose (HPMC)-was varied systematically to adjust the drug loading and entrapment efficiency, sponge buoyancy, and the release profile of Cur-SMEDDS...
March 15, 2017: Scientia Pharmaceutica
https://www.readbyqxmd.com/read/28292517/a-liquid-chromatography-mass-spectrometry-method-based-on-post-column-derivatization-for-automated-analysis-of-urinary-hexanal-and-heptanal
#18
Di Chen, Jun Ding, Ming-Ke Wu, Tian-Yi Zhang, Chu-Bo Qi, Yu-Qi Feng
A fully automated in-tube solid phase microextraction/liquid chromatography-post column derivatization-mass spectrometry (in-tube SPME/LC-PCD-MS) method was developed for the analysis of urinary hexanal and heptanal. Online in-tube SPME enabled effective enrichment of the low level aldehydes and elimination of matrix interferences. PCD could be simply realized by mixing the LC elute and hydroxylamine hydrochloride (HAHC) solution with just a tee. The peak broadening and loss in separation efficiency associated with post column dead-volume could be ignored and even completely eliminated by employing suitable PCD configuration...
March 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28285074/irinotecan-loaded-double-reversible-thermogel-with-improved-antitumor-efficacy-without-initial-burst-effect-and-toxicity-for-intramuscular-administration
#19
Fakhar Ud Din, Dong Wuk Kim, Ju Yeon Choi, Raj Kumar Thapa, Omer Mustapha, Dong Shik Kim, Yu-Kyoung Oh, Sae Kwang Ku, Yu Seok Youn, Kyung Taek Oh, Chul Soon Yong, Jong Oh Kim, Han-Gon Choi
Intramuscularly administered, anti-tumour drugs induce severe side effects due to their direct contact with body tissues and initial burst effect. In this study, to solve this problem, a novel double-reversible thermogel system (DRTG) for the intramuscular administration of irinotecan was developed. This irinotecan-loaded DRTG was prepared by dispersing the irinotecan-loaded thermoreversible solid lipid nanoparticles (SLNs) in the thermoreversible hydrogel. In DRTG, the former was solid at 25°C but converted to liquid at 36...
March 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28272860/fabrication-of-stable-and-regenerable-amine-functionalized-magnetic-nanoparticles-mnfe2o4-sio2-nh2-as-a-potential-material-for-pt-iv-recovery-from-acidic-solutions
#20
D Harikishore Kumar Reddy, Wei Wei, Shuo Lin, Myung-Hee Song, Yeoung-Sang Yun
MnFe2O4@SiO2-NH2 magnetic nanocomposite (AFMNC) adsorbent with a particle size of ~50 nm was successfully synthesized using a facile approach. The as-prepared composite particles showed a fast binding of Pt(IV) with easy magnetic solid-liquid separation. The kinetic data were fitted to both pseudo-first and pseudo-second-order rate models, indicating that AFMNC exhibited a much higher rate of Pt(IV) binding (0.125 g mg-1 min-1) compared with commercial ion exchange resin Amberjet 4200 (0.0002 g mg-1 min-1)...
March 8, 2017: ACS Applied Materials & Interfaces
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