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Cationic surfactant regulated synthesis of Au nanorods for sensitive detection of negatively charged colorants by surface‐enhanced Raman spectroscopy

Published: Feb 13, 2019

Author(s): Miao Qin, Pan Li, Xia Zhou, Jun Zhu, Hongyan Wang, Liangbao Yang

Journal: Journal of Raman Spectroscopy

Abstract Although surface‐enhanced Raman spectroscopy (SERS) has recently emerged as a powerful analytical tool, its widespread use is hindered by several inherent problems (e.g., low reproducibility) that need to be solved before further progress is possible. Herein, we used dodecyltrimethylammonium bromide (DTAB), N‐dodecyl‐N‐2‐hydroxyethyl‐N,N‐dimethylammonium bromide (C12HDAB), and N‐dodecyl‐N,N‐2‐dihydroxyethyl‐N‐methylammonium bromide (C12DHAB) as templates for the seed‐mediated growth...

Read More thumbnail image: Cationic surfactant regulated synthesis of Au nanorods for sensitive detection of negatively charged colorants by surfaceenhanced Raman spectroscopy

In situ full view of the Portland cement hydration by confocal Raman microscopy

Published: Feb 13, 2019

Author(s): Manuel Torres‐Carrasco, Adolfo Campo, Miguel A. Rubia, Encarnación Reyes, Amparo Moragues, Jose F. Fernández

Journal: Journal of Raman Spectroscopy

Abstract The study of the hydration reactions of Portland cement is well documented by conventional techniques such as X‐ray diffraction, differential thermal and thermogravimetric analysis, or NMR, for instance. However, a complete view of all the phases present in the reactions is elusive. In this study, by using an in situ analysis through confocal Raman microscopy (CRM), the reaction of the initial phases (C2S, C3S, and C3A) to form new crystalline phases (portlandite, ettringite, and...

Read More thumbnail image: In situ full view of the Portland cement hydration by confocal Raman microscopy

Metabolic profiling of synthetic cannabinoid 5F‐ADB by human liver microsome incubations and urine samples using high‐resolution mass spectrometry

Published: Feb 13, 2019

Author(s): Oya Yeter, Yeter Erol Ozturk

Journal: Drug Testing and Analysis

Abstract 5F‐ADB (methyl 2‐{[1‐(5‐fluoropentyl)‐1H‐indazole‐3‐carbonyl] amino}‐3,3‐dimethylbutanoate) is a frequently abused new synthetic cannabinoid that has been sold since at least the end of 2014 on the drug market and has been classified as an illicit drug in most European countries, as well as Turkey, Japan, and the United States. In this study, the in vitro metabolism of 5F‐ADB was investigated by using pooled human liver microsomes (HLMs) assay and liquid chromatography‐high‐resolution...

Read More thumbnail image: Metabolic profiling of synthetic cannabinoid 5FADB by human liver microsome incubations and urine samples using highresolution mass spectrometry

Diagram, valence‐to‐core, and hypersatellite Kβ X‐ray transitions in metallic chromium

Published: Feb 13, 2019

Author(s): Faisal Zeeshan, Joanna Hoszowska, Jean‐Claude Dousse, Dimosthenis Sokaras, Tsu‐Chien Weng, Roberto Alonso‐Mori, Matjaz Kavčič, Mauro Guerra, Jorge Miguel Sampaio, Fernando Parente, Paul Indelicato, José Pires Marques, José Paulo Santos

Journal: X-Ray Spectrometry

We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the present study confirms the line shape features observed in previous works, whereas the Khβ hypersatellite transition was...

Read More thumbnail image: Diagram valencetocore and hypersatellite K Xray transitions in metallic chromium

Advances in the histopathological characterization of breast tissue using combined X‐ray fluorescence and X‐ray diffraction data in a multivariate analysis approach

Published: Feb 13, 2019

Author(s): Eric M. Johnston, Erica Dao, Michael J. Farquharson

Journal: X-Ray Spectrometry

Previous studies have shown that the combination of X‐ray fluorescence and X‐ray diffraction data can be used as a histopathological characterization tool for breast tissue. Recent advances in energy‐dispersive X‐ray fluorescence techniques have allowed for benchtop systems to produce useful results in a reasonable time frame, allowing for clinical implementation to be realized. Using a polarized energy‐dispersive X‐ray fluorescence and energy‐dispersive X‐ray diffraction system optimized for...

Read More thumbnail image: Advances in the histopathological characterization of breast tissue using combined Xray fluorescence and Xray diffraction data in a multivariate analysis approach

DIY XES—development of an inexpensive, versatile, and easy to fabricate XES analyzer and sample delivery system

Published: Feb 13, 2019

Author(s): Scott C. Jensen, Brendan Sullivan, Daniel A. Hartzler, Yulia Pushkar

Journal: X-Ray Spectrometry

The application of X‐ray emission spectroscopy (XES) has grown substantially with the development of X‐ray free‐electron lasers, third and fourth generation synchrotron sources, and high‐power benchtop sources. By providing the high X‐ray flux required for XES, these sources broaden the availability and application of this method of probing electronic structure. As the number of sources increase, so does the demand for X‐ray emission detection and sample delivery systems that are cost...

Read More thumbnail image: DIY XESdevelopment of an inexpensive versatile and easy to fabricate XES analyzer and sample delivery system

Enantioseparation of tryptophan and its unnatural derivatives by nano‐LC on CSP‐teicoplanin silica based

Published: Feb 12, 2019

Author(s): Giovanni D'Orazio, Chiara Fanali, Alessandra Gentili, Salvatore Fanali

Journal: ELECTROPHORESIS

Abstract This work deals with the potentiality of nano liquid chromatography (Nano‐LC) for the chiral separation of racemic mixture of tryptophan and some selected derivatives by using 100 μm i.d. fused silica capillary packed with teicoplanin bonded to 5 μm diol silica stationary phase. The experiments were carried out by using a cheap and laboratory‐assembled nano‐LC–UV system. Elution was done in an isocratic mode using a polar organic mobile phase. In order to find the optimum chiral...

Read More thumbnail image: Enantioseparation of tryptophan and its unnatural derivatives by nanoLC on CSPteicoplanin silica based

Electrophoresis of hydrophilic/hydrophobic rigid colloid with effects of relaxation and ion size

Published: Feb 12, 2019

Author(s): Binod Kumar, Partha P. Gopmandal, R. K. Sinha, H. Ohshima

Journal: ELECTROPHORESIS

Abstract This article deals with a semi‐analytical study on the electrophoresis of charged spherical rigid colloid by considering the effects of relaxation and ion size. The particle surface is taken to be either hydrophilic or hydrophobic in nature. In order to consider the ion size effect we have invoked the Carnahan and Starling model (J. Chem. Phys. 1969, 51, 635‐636). The mathematical model is based on Stokes equation for fluid flow, modified Boltzmann equation for spatial distribution of...

Read More thumbnail image: Electrophoresis of hydrophilichydrophobic rigid colloid with effects of relaxation and ion size

Understanding anomalous mobility of proteins on SDS‐PAGE with special reference to the highly acidic extracellular domains of human E‐ and N‐cadherins

Published: Feb 12, 2019

Author(s): Prince Tiwari, Pallavi Kaila, Purnananda Guptasarma

Journal: ELECTROPHORESIS

Abstract During SDS‐PAGE experiments, proteins generally display electrophoretic mobility in keeping with their molecular weights; however, some proteins display anomalies in mobility. Here, we focus attention on the anomalies displayed by the highly acidic ∼110 residues‐long, sequence‐homologous, structurally‐analogous, extracellular domains of human E‐ and N‐cadherin. We report that there is a strong correlation between the acidity of each domain and the degree of the anomaly that it...

Read More thumbnail image: Understanding anomalous mobility of proteins on SDSPAGE with special reference to the highly acidic extracellular domains of human E and Ncadherins

Reconciling PC‐MRI and CFD: An in‐vitro study

Published: Feb 12, 2019

Author(s): Thomas Puiseux, Anou Sewonu, Olivier Meyrignac, Hervé Rousseau, Franck Nicoud, Simon Mendez, Ramiro Moreno

Journal: NMR in Biomedicine

Several well‐resolved 4D Flow MRI acquisitions of an idealized rigid flow phantom featuring an aneurysm, a curved channel as well as a bifurcation were performed under pulsatile regime. The resulting hemodynamics were processed to remove MRI artifacts. Subsequently, they were compared with CFD predictions computed on the same flow domain, using an in‐house high‐order low dissipative flow solver. Results show that reaching a good agreement is not straightforward but requires proper treatments...

Read More thumbnail image: Reconciling PCMRI and CFD An invitro study

Recent studies of docking and molecular dynamics simulation for liquid‐phase enantioseparations

Published: Feb 12, 2019

Author(s): Sergio Cossu, Victor Mamane, Roberto Dallocchio, Alessandro Dessì, Paola Peluso

Journal: ELECTROPHORESIS

Abstract Liquid‐phase enantioseparations have been fruitfully applied in several fields of science. Various applications along with technical and theoretical advancements contributed to increase significantly the knowledge in this area. Nowadays, chromatographic techniques, in particular HPLC on chiral stationary phase, are considered as mature technologies. In the last thirty years, CE has been also recognized as one of the most versatile technique for analytical scale separation of...

Read More thumbnail image: Recent studies of docking and molecular dynamics simulation for liquidphase enantioseparations

Magnetic solid‐phase extraction based on carbon nanosphere@Fe3O4 for enantioselective determination of eight triazole fungicides in water samples

Published: Feb 12, 2019

Author(s): Zhaokun Wang, Xia Wang, Shuang Li, Zhen Jiang, Xingjie Guo

Journal: ELECTROPHORESIS

Abstract In this work, a carbon nanosphere decorated by Fe3O4 nanoparticles was prepared, characterized and used as the magnetic adsorbent. Eight commonly used chiral triazole fungicides, including penconazole, uniconazole, paclobutrazol, triazolone, tebuconazole, hexaconazole, triticonazole and epoxiconazole were extracted from two environmental water samples (river water and lake water) by magnetic solid‐phase extraction, followed by the enantiomeric analysis on a Chiralpark IC column...

Read More thumbnail image: Magnetic solidphase extraction based on carbon nanosphereFe3O4 for enantioselective determination of eight triazole fungicides in water samples

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Published: Feb 11, 2019

Author(s): Caruline S. C. Machado, Rafael E. Klumpp, Victor H. Ayusso, Uyime Donatus, Mariana X. Milagre, João V. S. Araujo, Glauson A. F. Machado, I. Costa

Journal: Surface and Interface Analysis

In this work, the effect of eight types of surface treatments on the corrosion resistance of friction stir welded samples of an AA2198‐T8 Al‐Cu‐Li alloy were tested and compared in an attempt to find suitable alternatives to toxic and carcinogenic hexavalent chromium treatments. All the samples were anodized and subjected to different post‐anodizing treatments. The post‐anodizing treatments were (1) hydrothermal treatment in Ce (NO3)3 6H2O solution; (2) hydrothermal treatment in Ce (NO3)3 6H2O...

Read More thumbnail image: Effect of surface treatments on the localized corrosion resistance of the AA2198T8 aluminum lithium alloy welded by FSW process

Electrochemical behavior of active surface layers in AA8xxx aluminum alloys

Published: Feb 11, 2019

Author(s): Francesco Andreatta, Alex Lanzutti, Stefano Maschio, Lorenzo Fedrizzi

Journal: Surface and Interface Analysis

AA8xxx alloys employed in the HVAC&R sector (heating, ventilating, air conditioning, and refrigerating) were investigated to highlight the effect of active surface layers in heat‐exchanger fins. The local behavior of the surface and the bulk of the alloy sheets was studied by means of an electrochemical microcell in combination with glow‐discharge optical‐emission spectrometry. Surface layers strongly enhance the electrochemical activity of the fin material. This is related to the segregation...

Read More thumbnail image: Electrochemical behavior of active surface layers in AA8xxx aluminum alloys

ARDESIA: A fast silicon drift detector X‐ray spectrometer for synchrotron applications

Published: Feb 10, 2019

Author(s): Idham Hafizh, Giovanni Bellotti, Marco Carminati, Gianlorenzo Utica, Matteo Gugiatti, Antonella Balerna, Vinicio Tullio, Giacomo Borghi, Antonio Picciotto, Francesco Ficorella, Nicola Zorzi, Andrea Capsoni, Simone Coelli, Luca Bombelli, Carlo Fiorini

Journal: X-Ray Spectrometry

ARDESIA, a four‐channel X‐ray spectrometer based on silicon drift detectors (SDDs), is presented. It has been developed for synchrotron applications targeting especially X‐ray fluorescence (XRF) and X‐ray absorption spectroscopy (XAS) with good energy resolution at high count rates (a few Mcps per second). The main target applications are XRF and XAFS techniques. The system features a 2 × 2 monolithic array of 5‐mm‐pitch SDDs cooled with a double Peltier scheme and coupled to a four‐channel...

Read More thumbnail image: ARDESIA A fast silicon drift detector Xray spectrometer for synchrotron applications

Evaluation of the structural characteristics and the fading effects of image plates

Published: Feb 10, 2019

Author(s): A.S.S. Silva, C.S. Gomes, A.S. Machado, J.R. Nascimento, R.S. Santos, D.F. Oliveira, M.J. Dos Anjos, R.T. Lopes

Journal: X-Ray Spectrometry

The photostimulated luminescence (PSL) is the basis for the digital image formation of image plates (IPs). However, the PSL decreases exponentially with the increasing of the elapsed time between the exposure and the IP scanning (t), and consequently, there is a fading of the digital image. The purpose of this paper is to investigate the relationship between IPs physical structure and elemental composition with the fading behavior. Three different types of IPs, with distinct resolutions, were...

Read More thumbnail image: Evaluation of the structural characteristics and the fading effects of image plates

In vivo 1H MRS of human gallbladder bile in understanding the pathophysiology of primary sclerosing cholangitis (PSC): Immune‐mediated disease versus bile acid‐induced injury

Published: Feb 8, 2019

Author(s): Sanaz Mohajeri, Tedros Bezabeh, Omkar B. Ijare, Scott B. King, Michael Albert Thomas, Gerald Minuk, Jeremy Lipschitz, Iain Kirkpatrick, Allan B. Micflikier, Randy Summers, Ian C.P. Smith

Journal: NMR in Biomedicine

Primary sclerosing cholangitis (PSC) has been considered to be either an “autoimmune disease” or a “bile acid‐induced injury.” In vitro MRS studies on PSC patients have limitations due to the contamination of bile with contrast agent (commonly administered during endoscopic retrograde cholangiopancreatography) and/or the use of patient cohorts with other diseases as controls. The objective of this study was to quantify biliary metabolites using in vivo 1H MRS and gain insight into the...

Read More thumbnail image: In vivo 1H MRS of human gallbladder bile in understanding the pathophysiology of primary sclerosing cholangitis PSC Immunemediated disease versus bile acidinduced injury

Cyclodextrin‐mediated capillary electrophoresis enantioseparation of dansylated β‐amino acids with bicyclo[2.2.2]octane, bicyclo[3.1.1]heptane and cyclopenta[d][1,2]oxazole core structures

Published: Feb 8, 2019

Author(s): Henrik Harnisch, István Ilisz, Ferenc Fülöp, Zsolt Szakonyi, Lóránd Kiss, Antal Péter, Gerhard K. E. Scriba

Journal: ELECTROPHORESIS

Abstract The present study investigated the separation of bicyclic β‐amino acids with bicyclo[2.2.2]octane, bicyclo[3.1.1]heptane and cyclopenta[d][1,2]oxazole core structures by capillary electrophoresis using native cyclodextrins as well as neutral and charged derivatives as chiral selectors. The amino acids were derivatized with dansyl chloride to provide a UV chromophore. Separations were carried out at 20°C in a 48.5/40 cm, 50 μm fused‐silica capillary at an applied voltage of 20 kV....

Read More thumbnail image: Cyclodextrinmediated capillary electrophoresis enantioseparation of dansylated amino acids with bicyclo2_2_2octane bicyclo3_1_1heptane and cyclopentad12oxazole core structures

Selective detection of cytochrome C by microchip electrophoresis based on an aptamer strategy

Published: Feb 8, 2019

Author(s): Luqi Zhu, Feifei Luo, Zhi Li, Ge Dai, Pingang He, Qingjiang Wang, Qiming Chen

Journal: ELECTROPHORESIS

Abstract The release of cytochrome C (Cyt C) plays an important role in apoptosis. In this study, selective and sensitive detection of Cyt C based on an aptamer strategy coupled with MCE was developed. Following the binding of a specific aptamer to Cyt C, the aptamer exhibited an irregular state, reducing the binding affinity of a fluorescent probe, and thus preventing the aptamer‐Cyt C complexes from detection within the MCE. The height of the detection peak of the residual aptamer linearly...

Read More thumbnail image: Selective detection of cytochrome C by microchip electrophoresis based on an aptamer strategy

Spectroscopic analysis of polychromic sculptures belonging to the cultural heritage of Extremadura (Spain)

Published: Feb 7, 2019

Author(s): Maria José Nuevo, Alejandro Martín Sánchez, Miguel Angel Ojeda

Journal: X-Ray Spectrometry

Several spectroscopic techniques have been applied in order to characterize the polychrome pigments used in some religious sculptures, from the 13th to the 18th centuries, belonging to the cultural heritage of Extremadura (west of Spain). First, two energy‐dispersive X‐ray fluorescence portable devices were used. The measurements were carried out in situ, where the artworks were been restored. In addition to these nondestructive analyses, various samples with a millimeter size were taken from...

Read More thumbnail image: Spectroscopic analysis of polychromic sculptures belonging to the cultural heritage of Extremadura Spain
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