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https://www.readbyqxmd.com/read/28927003/expanding-the-applicability-of-poly-ionic-liquids-in-solid-phase-microextraction-pyrrolidinium-coatings
#1
David J S Patinha, Liliana C Tomé, Mehmet Isik, David Mecerreyes, Armando J D Silvestre, Isabel M Marrucho
Crosslinked pyrrolidinium-based poly(ionic liquids) (Pyrr-PILs) were synthesized through a fast, simple, and solventless photopolymerization scheme, and tested as solid phase microextraction (SPME) sorbents. A series of Pyrr-PILs bearing three different alkyl side chain lengths with two, eight, and fourteen carbons was prepared, characterized, and homogeneously coated on a steel wire by using a very simple procedure. The resulting coatings showed a high thermal stability, with decomposition temperatures above 350 °C, excellent film stability, and lifetime of over 100 injections...
September 18, 2017: Materials
https://www.readbyqxmd.com/read/28926678/organic-polymer-based-monolithic-stationary-phases-with-incorporated-nanostructured-materials-for-hplc-and-cec
#2
REVIEW
Nisansala Ganewatta, Ziad El Rassi
This review article is concerned with the recent advances made in the field of organic polymer-based monoliths with incorporated nanostructured materials (NSMs) for use in liquid chromatography and capillary electrochromatography. It covers the pertinent literature published over the last 7-8 years with a total of 56 references. The present article has two distinct parts: one major part encompassing "traditional" organic polymer-based monoliths modified with NSMs and a minor part on cryogels modified with NSMs...
September 19, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28926137/metabolic-profile-of-rhizoma-coptidis-in-human-plasma-determined-using-ultra-high-performance-liquid-chromatography-coupled-with-high-resolution-mass-spectrometry
#3
Qing-Shan Zhang, Gao-Wa Wang, Zhi-Qiang Han, Xiang-Mei Chen, Risu Na, Haburi Jin, Ping Li, Renbatu Bu
RATIONALE: Rhizoma coptidis extract and its alkaloids show various pharmacological activities, but its metabolic profile in human plasma has not been thoroughly investigated. In the present research, the metabolism of Rhizoma coptidis at a clinical dose (5 g/60 kg/day) was systematically analyzed to determine its biotransformation processes in human plasma. METHODS: In this research, the metabolites of Rhizoma coptidis in human plasma after oral administration of Rhizoma coptidis extract at a clinical dose were investigated using ultra high-performance liquid chromatography (UHPLC) coupled with high-resolution LTQ-Orbitrap mass spectrometry...
September 19, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28926059/br%C3%A3-nsted-acidity-in-deep-eutectic-solvents-and-ionic-liquids
#4
Andrew P Abbott, Sahar S M Alabdullah, Azhar Y M Al-Murshedi, Karl S Ryder
Despite the importance of ionic liquids in a variety of fields, little is understood about the behaviour of protons in these media. The main difficulty arises due to the unknown activity of protons in non-aqueous solvents. This study presents acid dissociation constants for nine organic acids in deep eutectic solvents (DESs) using standard pH indicator solutes. The pKIn value for bromophenol blue was found by titrating the DES with triflic acid. The experimental method was developed to understand the acid-base properties of deep eutectic solvents, and through this study it was found that the organic acids studied were slightly less dissociated in the DES than in water with pKa values between 0...
September 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28924083/characterization-of-o-w-emulsions-prepared-by-peg-diisostearate-amphiphilic-random-copolymer
#5
Megumi Kaji, Sari Fujiwara, Kenichi Sakai, Hideki Sakai
We have characterized an emulsion system stabilized by an amphiphilic random copolymer, methoxy polyethylene glycol-23 methacrylate/glyceryl diisostearate methacrylate copolymer (MPM-GDM). The combined results of the static surface tension and transmission electron microscopy with freeze-fracture technique (FF-TEM) suggested that this copolymer forms aggregates in aqueous solutions. The membrane emulsification method produced an oil-in-water (O/W) emulsion in the mixture of squalane, water, and MPM-GDM, where the squalane concentration was set at 10 - 60 wt% and the MPM-GDM concentration was either 1 or 5 wt%...
September 15, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28923736/atomic-layered-mn-clusters-deposited-on-palygorskite-as-powerful-adsorbent-for-recovering-valuable-rees-from-wastewater-with-superior-regeneration-stability
#6
Xujian Li, Xing Zhang, Heng Yang, Qi Zhou
The control of dispersity and size of metal particles deposited on substrate surface are always the major challenges for fabricating the efficient and stable metallic nanoparticles-decorated composite. Herein, we proposed a simple liquid-phase atomic layer deposition (L-ALD) method to obtain an atomic-layered MnO2 nanoparticles loaded palygorskite nanorod (MnO2@Pal), involving two-step procedures comprised of the solid-liquid interfacial reaction between organic manganese precursor and surface hydroxyl groups of palygorskite, and then a calcination treatment to activate surface Mn, which is used as a powerful adsorbent for recovery of REE ions from wastewater...
September 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28922923/interfacial-properties-and-mechanisms-dominating-gas-hydrate-cohesion-and-adhesion-in-liquid-and-vapor-hydrocarbon-phases
#7
Sijia Hu, Carolyn A Koh
The interfacial properties and mechanisms of gas hydrate systems play a major role in controlling their interparticle and surface interactions, which is desirable for nearly all energy applications of clathrate hydrates. In particular, preventing gas hydrate interparticle agglomeration and/or particle-surface deposition is critical to the prevention of gas hydrate blockages during the exploration and transportation of oil and gas subsea flowlines. These agglomeration and deposition processes are dominated by particle-particle cohesive forces and particle-surface adhesive force...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28921965/mycelium-enhanced-bacterial-degradation-of-organic-pollutants-under-bioavailability-restrictions
#8
Rungroch Sungthong, Margalida Tauler, Magdalena Grifoll, Jose-Julio Ortega-Calvo
This work examines the role of mycelia in enhancing the degradation by attached bacteria of organic pollutants that have poor bioavailability. Two oomycetes, Pythium oligandrum and Pythium aphanidermatum, were selected as producers of mycelial networks, while Mycobacterium gilvum VM552 served as a model polycyclic aromatic hydrocarbon (PAH)-degrading bacterium. The experiments consisted of bacterial cultures exposed to a non-disturbed non-aqueous phase liquid (NAPL) layer containing a heavy fuel spiked with 14C-labeled phenanthrene that were incubated in the presence or absence of the mycelia of the oomycetes in both shaking and static conditions...
September 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28921890/phase-ii-study-of-dabigatran-in-children-with-venous-thrombosis-pharmacokinetics-safety-and-tolerabilty
#9
J M L Halton, M Albisetti, B Biss, L Bomgaars, M Brueckmann, S Gropper, R Harper, F Huang, M Luciani, H Maas, I Tartakovsky, L G Mitchell
BACKGROUND: The current standard-of-care treatments for pediatric venous thromboembolism (VTE) have limitations. Dabigatran etexilate (DE), a direct thrombin inhibitor, may offer an alternative therapeutic option. OBJECTIVES: To assess the pharmacokinetics (PK), pharmacodynamics (PD), safety and tolerability of DE oral liquid formulation (OLF) in pediatric patients with VTE. PATIENTS/METHODS: Patients who had completed planned treatment with low-molecular-weight heparin or oral anticoagulants for VTE were enrolled in two age groups (2-<12 and 1-<2 years) and received DE OLF based on an age- and weight-adjusted nomogram...
September 16, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28920987/mechanisms-of-distinct-activated-carbon-and-biochar-amendment-effects-on-petroleum-vapour-biofiltration-in-soil
#10
Khaled M Bushnaf, George Mangse, Paola Meynet, Russell J Davenport, Olaf A Cirpka, David Werner
We studied the effects of two percent by weight activated carbon versus biochar amendments in 93 cm long sand columns on the biofiltration of petroleum vapours released by a non-aqueous phase liquid (NAPL) source. Activated carbon greatly enhanced, whereas biochar slightly reduced, the biofiltration of volatile petroleum hydrocarbons (VPHs) over 430 days. Sorbent amendment benefitted the VPH biofiltration by retarding breakthrough during the biodegradation lag phase. Subsequently, sorbent amendment briefly reduced the mineralization of petroleum hydrocarbons by limiting their bioavailability...
September 18, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28918328/semiautomated-determination-of-neonicotinoids-and-characteristic-metabolite-in-urine-samples-using-turboflow%C3%A2-coupled-to-ultra-high-performance-liquid-chromatography-coupled-to-orbitrap-analyzer
#11
Marina López-García, Roberto Romero-González, Marina Lacasaña, Antonia Garrido Frenich
A semiautomated method based on ultra-high performance liquid chromatography (UHPLC) coupled to Orbitrap high resolution mass spectrometry has been developed for the determination of neonicotinoids (imidacloprid, acetamiprid, clothianidin, dinotefuran, nitenpyram, thiacloprid and thiamethoxam) and the metabolite acetamiprid-n-desmethyl in urine samples. Two automated methods were tested (solid-phase extraction "SPE" and turbulent flow chromatography "TurboFlow™"), obtaining the best results when TurboFlow™ was applied...
September 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28917081/evaluation-of-the-ecstasy-influence-on-tramadol-and-its-main-metabolite-plasma-concentration-in-rats
#12
Bardia Jamali, Behjat Sheikholeslami, Yalda Hosseinzadeh Ardakani, Hoda Lavasani, Mohammad-Reza Rouini
BACKGROUND: Tramadol is prone to be abused alone, or in combination with 3,4-methylenedioxymethamphetamine (MDMA, Ecstasy). It was reported that 95% of people with a history of substance abuse in the United States used tramadol in 2004. According to the WHO report in 2016, there was a growing number of tramadol abusers alone or in combination with psychoactive substances such as MDMA in particular in some Middle East countries. Higher concentrations of tramadol in plasma may lead to adverse drug reactions or lethal intoxication...
September 16, 2017: Drug Metabolism and Personalized Therapy
https://www.readbyqxmd.com/read/28915454/assessing-the-potential-contributions-of-additional-retention-processes-to-pfas-retardation-in-the-subsurface
#13
Mark L Brusseau
A comprehensive understanding of the transport and fate of per- and poly-fluoroalkyl substances (PFAS) in the subsurface is critical for accurate risk assessments and design of effective remedial actions. A multi-process retention model is proposed to account for potential additional sources of retardation for PFAS transport in source zones. These include partitioning to the soil atmosphere, adsorption at air-water interfaces, partitioning to trapped organic liquids (NAPL), and adsorption at NAPL-water interfaces...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28915422/determination-of-hydroxyurea-in-human-plasma-by-hplc-uv-using-derivatization-with-xanthydrol
#14
Tiphaine Legrand, Marie-Georgine Rakotoson, Frédéric Galactéros, Pablo Bartolucci, Anne Hulin
A simple and rapid high performance liquid chromatography (HPLC) method using ultraviolet (UV) detection was developed to determine hydroxyurea (HU) concentration in plasma sample after derivatization with xanthydrol. Two hundred microliters samples were spiked with methylurea (MeU) as internal standard and proteins were precipitated by adding methanol. Derivatization of HU and MeU was immediately performed by adding 0.02M xanthydrol and 1.5M HCl in order to obtain xanthyl-derivatives of HU and MeU that can be further separated using HPLC and quantified using UV detection at 240nm...
September 7, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28915419/sensitivity-improvement-of-the-lc-ms-ms-quantification-of-carbidopa-in-human-plasma-and-urine-by-derivatization-with-2-4-pentanedione
#15
Nico C van de Merbel, Kees J Bronsema, Steven H Gorman, Ray Bakhtiar
The reliable quantification of carbidopa in biological samples at low concentrations is challenging because of the polar and highly unstable nature of the compound. In this paper, LC-MS/MS methods are described for the determination of carbidopa in 50μL of human plasma and 25μL of human urine in the concentration ranges 1-1,000ng/mL and 100-50,000ng/mL, respectively. After a simple protein precipitation (plasma) or dilution (urine) step, carbidopa is derivatized at its hydrazine moiety by reaction for one hour with 2,4-pentanedione under acidic conditions and at 40°C...
September 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28915418/purification-identification-and-molecular-mechanism-of-two-dipeptidyl-peptidase-iv-dpp-iv-inhibitory-peptides-from-antarctic-krill-euphausia-superba-protein-hydrolysate
#16
Wei Ji, Chaohua Zhang, Hongwu Ji
Dipeptidyl peptidase IV (DPP-IV) played an important role in blood glucose regulation. Inhibition of DPP-IV may improve glycemic control in diabetics by preventing the rapid breakdown of incretin hormones and prolonging their physiological action. In this study, Antarctic krill (Euphausia superba) protein was hydrolyzed using animal proteolytic enzymes. The hydrolysate was purified sequentially by ultrafiltration, gel filtration chromatography and reversed phase high-performance liquid chromatography (RP-HPLC)...
September 5, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28912724/abnormalities-in-the-polysomnographic-adenosine-and-metabolic-response-to-sleep-deprivation-in-an-animal-model-of-hyperammonemia
#17
Selena Marini, Olena Santangeli, Pirjo Saarelainen, Benita Middleton, Namrata Chowdhury, Debra J Skene, Rodolfo Costa, Tarja Porkka-Heiskanen, Sara Montagnese
Patients with liver cirrhosis can develop hyperammonemia and hepatic encephalopathy (HE), accompanied by pronounced daytime sleepiness. Previous studies with healthy volunteers show that experimental increase in blood ammonium levels increases sleepiness and slows the waking electroencephalogram. As ammonium increases adenosine levels in vitro, and adenosine is a known regulator of sleep/wake homeostasis, we hypothesized that the sleepiness-inducing effect of ammonium is mediated by adenosine. Eight adult male Wistar rats were fed with an ammonium-enriched diet for 4 weeks; eight rats on standard diet served as controls...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28911942/new-perspectives-in-high-efficient-and-ultrafast-chiral-liquid-chromatography-through-zwitterionic-teicoplanin-based-2-%C3%AE-m-superficially-porous-particles
#18
Omar H Ismail, Michela Antonelli, Alessia Ciogli, Claudio Villani, Alberto Cavazzini, Martina Catani, Simona Felletti, David S Bell, Francesco Gasparrini
With the aim of pushing forward the limits of high efficient and ultrafast chiral liquid chromatography, a new Chiral Stationary Phase (CSP) has been prepared by covalently bonding the teicoplanin selector on 2.0μm Superficially Porous Particles (SPPs). An already validated bonding protocol, which permits to achieve teicoplanin-based CSPs exhibiting zwitterionic behaviour, has been employed to prepare not only the 2.0μm version of the CSP but also two other analogous CSPs based, respectively, on 2.7μm SPPs and 1...
September 6, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28911269/applicability-of-two-dimensional-surface-model-in-bacterial-biosorption-system-an-advanced-approach-in-bioremediation-of-metal-ions
#19
Vishal Mishra
The surface of Bacillus VMSDCM accession no. HQ108109 has been characterized at various pH values of the experimental solution. The boundary values of conditional parameter were used to develop a mathematical six lumped stochastic model for studying the surface chemistry of the bacterium cells. The results of the model were statistically analyzed to understand the strength of the proposed model. The simulation of the model was performed in Turbo C++ interface. The convergence values of the model were recorded and all the asymptotic points were neglected...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28910590/redox-mediator-free-degradation-of-sulfathiazole-and-tetracycline-using-phanerochaete-chrysosporium
#20
Jehun Kwak, Soonuk Yoon, Biswanath Mahanty, Chang-Gyun Kim
The removal of two of the most commonly used antibiotics, tetracycline (TC) and sulfathiazole (STZ), using laccase-producing Phanerochaete chrysosporium was studied in liquid-phase batch experiments in the absence of any synthetic redox mediator. The removal of STZ and TC from single antibiotic spikes varied from 97.8% to 15.4% and 98.8% to 31%, respectively, with increasing initial doses of 10-250 mg L(-1) within 14 days of incubation. The enzyme activity of P. chrysosporium was only minimally influenced by the concentrations of these antibiotics...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
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