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https://www.readbyqxmd.com/read/28934694/development-and-implementation-of-a-pass-fail-field-friendly-method-for-detecting-sildenafil-in-suspect-pharmaceutical-tablets-using-a-handheld-raman-spectrometer-and-silver-colloids
#1
Adam Lanzarotta, Lisa Lorenz, JaCinta S Batson, Cheryl Flurer
A simple, fast, sensitive and effective pass/fail field-friendly method has been developed for detecting sildenafil in suspect Viagra and unapproved tablets using handheld Raman spectrometers and silver colloids. The method involves dissolving a portion of a tablet in water followed by filtration and addition of silver colloids, resulting in a solution that can be measured directly through a glass vial. Over one hundred counterfeit Viagra and unapproved tablets were examined on three different devices during the method development phase of the study...
September 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28934655/nano-sized-emission-from-commercially-available-paints-used-for-indoor-surfaces-during-drying
#2
Rikke Bramming Jørgensen, Ingrid Grav Hveding, Karoline Solheim
Consumers worry about the presence of nano-particles in paints and the risk of exposure. As a result, the paint industry now omits marketing paints as containing nanoparticles. The industry claims that no nanoparticles are released into the indoor environment; this, however, has yet to be documented. In this study, the emission of nano-sized emission from four indoor paints was investigated. The emission was studied for both base and full-pigmented versions of the paints, which consisted of three water-borne acrylic paints and one solvent-borne alkyd paint...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28933841/supramolecular-self-assembly-and-dual-switch-vapochromic-vapoluminescent-and-resistive-memory-behaviors-of-amphiphilic-platinum-ii-complexes
#3
Yongguang Li, Ling Chen, Yeye Ai, Eugene Yau-Hin Hong, Alan Kwun-Wa Chan, Vivian Wing-Wah Yam
A series of amphiphilic platinum(II) complexes with tridentate N-donor ligands has been synthesized and characterized. Different supramolecular architectures are constructed using the amphiphilic molecules as the building blocks through the formation of Pt···Pt and π-π stacking interactions in aqueous media. The aggregation-deaggregation-aggregation self-assembly behavior together with obvious spectroscopic changes could be fine-tuned by the addition of THF in aqueous media. More interestingly, one of the complexes is found to show fast response and high selectivity toward alcohol and water vapors with good reversibility, leading to drastic color and luminescence changes, and hence unique dual switching behavior, with the water molecules readily displaced by the alcohol vapor...
September 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28933825/the-surface-chemistry-of-perovskite-type-electrodes-during-high-temperature-co2-electrolysis-investigated-by-operando-photoelectron-spectroscopy
#4
Alexander Karl Opitz, Andreas Nenning, Christoph Rameshan, Markus Kubicek, Thomas Götsch, Raoul Blume, Michael Hävecker, Axel Knop-Gericke, Gunther Rupprechter, Bernhard Klötzer, Juergen Fleig
Any substantial move of energy sources from fossil fuels to renewable resources requires large scale storage of excess energy, for example via power to fuel processes. In this respect electrochemical reduction of CO2 may become very important, since it offers a method of sustainable CO production, which is a crucial prerequisite for synthesis of sustainable fuels. Carbon dioxide reduction in solid oxide electrolysis cells (SOECs) is particularly promising owing to the high operating temperature, which leads to both improved thermodynamics and fast kinetics...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28932618/a-simple-fast-and-inexpensive-simultaneous-determination-of-trace-bismuth-iii-and-lead-ii-in-water-samples-by-adsorptive-stripping-voltammetry
#5
Malgorzata Grabarczyk, Marzena Adamczyk
A simple, fast, and inexpensive voltammetric method for the simultaneous determination of trace bismuth(III) and lead(II) using (Hg(Ag)FE) as a working electrode was optimized. For adsorptive stripping voltammetric determination of Bi(III) and Pb(II) in a single scan, the cupferron was applied as a complexing agent. Experimental conditions under which these elements can be simultaneously detected include 0.1 mol L(-1) acetate buffer (pH = 4.6), 1 × 10(-4) mol L(-1) cupferron, accumulation potential -0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28932197/antiplasmodial-activity-and-toxicological-assessment-of-curcumin-plga-encapsulated-nanoparticles
#6
Zulaikha A Busari, Kabiru A Dauda, Olajumoke A Morenikeji, Funmilayo Afolayan, Oyetunde T Oyeyemi, Jairam Meena, Debasis Sahu, Amulya K Panda
Curcumin is a polyphenolic pigment isolated from the rhizomes of Curcuma longa (turmeric), a medicinal plant widely used in the ancient Indian and Chinese medicine. The antiplasmodial activity of curcumin is often hampered by its fast metabolism and poor water solubility, thus its incorporation into a delivery system could circumvent this problem. This study aimed to evaluate the in vivo antiplasmodial activity and the toxicity assessment of curcumin incorporated into poly (lactic-co-glycolic) acid (PLGA) nanoparticles...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28932108/cognitive-and-behavioral-evaluation-of-nutritional-interventions-in-rodent-models-of-brain-aging-and-dementia
#7
REVIEW
Devin Wahl, Sean Cp Coogan, Samantha M Solon-Biet, Rafael de Cabo, James B Haran, David Raubenheimer, Victoria C Cogger, Mark P Mattson, Stephen J Simpson, David G Le Couteur
Evaluation of behavior and cognition in rodent models underpins mechanistic and interventional studies of brain aging and neurodegenerative diseases, especially dementia. Commonly used tests include Morris water maze, Barnes maze, object recognition, fear conditioning, radial arm water maze, and Y maze. Each of these tests reflects some aspects of human memory including episodic memory, recognition memory, semantic memory, spatial memory, and emotional memory. Although most interventional studies in rodent models of dementia have focused on pharmacological agents, there are an increasing number of studies that have evaluated nutritional interventions including caloric restriction, intermittent fasting, and manipulation of macronutrients...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28930464/gastric-water-emptying-under-fed-state-clinical-trial-conditions-is-as-fast-as-under-fasted-conditions
#8
Michael Grimm, Elisabeth Scholz, Mirko Koziolek, Jens Peter Kuhn, Werner Weitschies
The Magenstrasse (stomach road) describes the fast emptying of ingested liquids from the postprandial stomach. The occurrence of the Magenstrasse has great importance for drugs administered together with food as it represents a shortcut through the fed stomach and allows rapid onset of plasma levels. In this study, we investigated the effect of different meals, their texture and fat content on the occurrence of the Magenstrasse. Since the administration of water is common 60 min after drug intake in clinical trials, we also investigated the effect of time point of water administration on the Magenstrasse by a second water administration...
September 20, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28929769/design-and-solidification-of-fast-releasing-clofazimine-nanoparticles-for-treatment-of-cryptosporidiosis
#9
Yingyue Zhang, Jie Feng, Simon A McManus, Hoang D Lu, Kurt D Ristroph, Eugene J Cho, Ellen L Dobrijevic, Hak-Kim Chan, Robert K Prud'homme
Clofazimine, a lipophilic (log P = 7.66) riminophenazine antibiotic approved by the US Food and Drug Administration (FDA) with a good safety record, was recently identified as a lead hit for cryptosporidiosis through a high-throughput phenotypic screen. Cryptosporidiosis requires fast-acting treatment as it leads to severe symptoms which, if untreated, result in morbidity for infants and small children. Consequently, a fast-releasing oral formulation of clofazimine in a water-dispersible form for pediatric administration is highly desirable...
September 20, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28929745/stabilization-of-polyoxometalate-water-oxidation-catalysts-on-hematite-by-atomic-layer-deposition
#10
Sarah M Lauinger, Brandon Deane Piercy, Wei Li, Qiushi Yin, Daniel Lynn Collins-Wildman, Elliot N Glass, Mark D Losego, Dunwei Wang, Yurii V Geletii, Craig L Hill
Fast and earth-abundant-element polyoxometalates (POMs) have been heavily studied recently as water oxidation catalysts (WOCs) in homogeneous solution. However, POM WOCs can be quite unstable when supported on electrode or photoelectrode surfaces under applied potential. This article reports for the first time that a nanoscale oxide coating (Al2O3) applied by atomic layer deposition (ALD) aids immobilization and greatly stabilizes this now large family of molecular WOCs when on electrode surfaces. In this study, [{RuIV4(OH)2(H2O)4}(γ-SiW10O34)2]10- (Ru4Si2) is supported on hematite photoelectrodes, then protected by ALD Al2O3, and this ternary system was characterized before and after photoelectrocatalytic water oxidation by FTIR, XPS, EDX and voltammetry...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929655/-a-semimicroquality-evaluation-method-on-panax-notoginseng-and-its-application-in-analysis-of-continuous-cropping-obstacles-research-samples
#11
Yi Cao, Chao-Qun Wang, Feng Xu, Xiu-Hong Jia, Guang-Xue Liu, Sheng-Chao Yang, Guang-Qiang Long, Zhong-Jian Chen, Fu-Zhou Wei, Shao-Zhou Yang, Kozo Fukuda, Xuan Wang, Shao-Qing Cai
Panax notoginseng is a commonly used traditional Chinese medicine with blood activating effect while has continuous cropping obstacle problem in planting process. In present study, a semimicroextraction method with water-saturated n-butanol on 0.1 g notoginseng sample was established with good repeatability (RSD<2.5%) and 9.6%-20.6% higher extraction efficiency of seven saponins than the conventional method. A total of 16 characteristic peaks were identified by LC-MS-IT-TOF, including eight 20(S)-protopanaxatriol (PPT) type saponins and eight 20(S)-protopanaxadiol (PPD) type saponins...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28928507/characteristics-of-xanthosoma-sagittifolium-roots-during-cooking-using-physicochemical-analysis-uniaxial-compression-multispectral-imaging-and-low-field-nmr-spectroscopy
#12
Abena Achiaa Boakye, María Gudjónsdóttir, Jacob Lercke Skytte, Ioannis S Chronakis, Faustina Dufie Wireko-Manu, Ibok Oduro
To effectively promote the industrial utilization of cocoyam (Xanthosoma sagittifolium) roots for enhanced food sustainability and security, there is a need to study their molecular, mechanical and physicochemical properties in detail. The physicochemical and textural characteristics of the red and white varieties of cocoyam roots were thus analysed by low field nuclear magnetic resonance relaxometry, multispectral imaging, uniaxial compression testing, and relevant physicochemical analysis in the current study...
August 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28925687/film-confinement-induced-jump-percolation-wetting-transition-in-amphiphilic-block-copolymer-films
#13
Namrata Salunke, Asritha Nallapaneni, Guangcui Yuan, Christopher M Stafford, Hui Niu, Matthew D Shawkey, Robert A Weiss, Alamgir Karim
We report a first-order like sharp surface wettability transition with varying film thickness dependent morphology in cast films of an amphiphilic triblock copolymer. Films comprised of poly(2-(N-ethylperfluotooctanesulfonamido) ethyl methylacrylate), poly(FOSM), and poly(N,N'-dimethyl acrylamide), poly(DMA), with thickness (h) in the transition-range, 200 < h < 300 nm, exhibited an abrupt hydrophobic to hydrophilic dynamic water contact angle transition. After an induction time, ti ≈ 40 to 180 s, water contact angle varied as θc ≈ 116° to 40° with an ultra-fast contact angle decay time constant, dθc/dt ≈ -18 °/s...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925686/a-naphthalimide-based-fluorophore-for-soft-anionic-interface-monitoring
#14
Li Wang, Gang Wang, Congdi Shang, Rui Kang, Yu Fang
A naphthalimide-based low-molecular mass fluorophore (NA) was designed and synthesized by introducing an azetidine unit onto the aromatic ring of the compound as an electron-donating structure, and a hydrophilic (2-(2-aminoethylamino)ethanol) moiety into the 'N-imide site' of the core structure. UV-vis absorption and fluorescence measurements revealed that the fluorophore is soluble in water, and shows a fluorescent quantum yield of ~20% and lifetime of ~3.7 ns in the solvent within a wide pH range. Moreover, the fluorescence emission and anisotropy of the fluorophore as produced are both dependent upon the viscosity and polarity of the medium...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28924898/formation-of-tyrosine-radicals-in-photosystem-ii-under-far-red-illumination
#15
Nigar Ahmadova, Fikret Mamedov
Photosystem II (PS II) contains two redox-active tyrosine residues on the donor side at symmetrical positions to the primary donor, P680. TyrZ, part of the water-oxidizing complex, is a preferential fast electron donor while TyrD is a slow auxiliary donor to P680(+). We used PS II membranes from spinach which were depleted of the water oxidation complex (Mn-depleted PS II) to study electron donation from both tyrosines by time-resolved EPR spectroscopy under visible and far-red continuous light and laser flash illumination...
September 18, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28923747/measurement-of-interfacial-area-from-nmr-time-dependent-diffusion-and-relaxation-measurements
#16
M Fleury
The interfacial area between two immiscible phases in porous media is an important parameter for describing and predicting 2 phase flow. Although present in several models, experimental investigations are sparse due to the lack of appropriate measurement techniques. We propose two NMR techniques for the measurement of oil-water interfacial area: (i) a time dependent NMR diffusion technique applicable in static conditions, similar to those used for the measurement of the solid specific surface of a porous media, and (ii) a fast relaxation technique applicable in dynamic conditions while flowing, based on an interfacial relaxation mechanism induced by the inclusion of paramagnetic salts in the water phase...
September 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923342/total-mercury-concentrations-in-liver-and-muscle-of-european-whitefish-coregonus-lavaretus-l-in-a-subarctic-lake-assessing-the-factors-driving-year-round-variation
#17
Ossi Keva, Brian Hayden, Chris Harrod, Kimmo K Kahilainen
Subarctic lakes are characterised by extreme seasonal variation in light and temperature which influences growth, maturation, condition and resource use of fishes. However, our understanding of how seasonal changes affect mercury concentrations of fishes is limited. We conducted a year-round study (3 ice-covered months, 3 open-water months) with open-water inter-annual aspect (3 years: samples from August/September), focusing on total mercury (THg) concentrations and ecological characteristics of a common freshwater fish, European whitefish (Coregonus lavaretus (L...
September 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28923341/acute-toxicity-bioconcentration-elimination-and-antioxidant-effects-of-fluralaner-in-zebrafish-danio-rerio
#18
Zhong-Qiang Jia, Di Liu, Cheng-Wang Sheng, John E Casida, Chen Wang, Ping-Ping Song, Yu-Ming Chen, Zhao-Jun Han, Chun-Qing Zhao
Fluralaner is a novel isoxazoline insecticide which shows high insecticidal activity against parasitic, sanitary and agricultural pests, but there is little information about the effect of fluralaner on non-target organisms. This study reports the acute toxicity, bioconcentration, elimination and antioxidant response of fluralaner in zebrafish. All LC50 values of fluralaner to zebrafish were higher than 10 mg L(-1) at 24, 48, 72 and 96 h. To study the bioconcentration and elimination, the zebrafish were exposed to sub-lethal concentrations of fluralaner (2...
September 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28923320/effect-of-water-on-the-chemical-stability-of-amorphous-pharmaceuticals-2-deamidation-of-peptides-and-proteins
#19
Satoshi Ohtake, Shaoxin Feng, Evgenyi Shalaev
Role of water in chemical (in)stability is revisited, with focus on deamidation in freeze-dried amorphous proteins and peptides. Two distinct patterns for deamidation vs. water have been reported, i.e., a consistent increase in rate constant with water, and a "hockey stick"-type behavior. For the latter, deamidation is essentially independent of water at lower water contents, and accelerates when water content increases above a threshold value. Two simple kinetic models are developed to analyze literature-reported relationships between water content and deamidation rate constants...
September 15, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28923276/rapid-whole-brain-resting-state-fmri-at-3%C3%A2-tesla-efficiency-optimized-three-dimensional-epi-versus-repetition-time-matched-simultaneous-multi-slice-epi
#20
Rüdiger Stirnberg, Willem Huijbers, Daniel Brenner, Benedikt A Poser, Monique Breteler, Tony Stöcker
State-of-the-art simultaneous-multi-slice (SMS-)EPI and 3D-EPI share several properties that benefit functional MRI acquisition. Both sequences employ equivalent parallel imaging undersampling with controlled aliasing to achieve high temporal sampling rates. As a volumetric imaging sequence, 3D-EPI offers additional means of acceleration complementary to 2D-CAIPIRINHA sampling, such as fast water excitation and elliptical sampling. We performed an application-oriented comparison between a tailored, six-fold CAIPIRINHA-accelerated 3D-EPI protocol at 530 ms temporal and 2...
September 15, 2017: NeuroImage
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