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Spectroscopy of metal hexaborides: Phonon dispersion models

Published: Sep 20, 2018

Author(s): Jose A. Alarco, Mahboobeh Shahbazi, Peter C. Talbot, Ian D.R. Mackinnon

Journal: Journal of Raman Spectroscopy

Abstract Raman spectroscopy of many metal hexaborides is well understood for vibrations of Pm 3 ¯ m symmetry that can be ascribed to the breathing and deforming modes of boron octahedral clusters at the corners of the cubic unit cell. However, the significance of the lower energy modes has been subject to debate wherein...

Read More thumbnail image: Spectroscopy of metal hexaborides Phonon dispersion models

Determination of trehalose by ion chromatography and its application to a pharmacokinetic study in rats after intramuscular injection

Published: Sep 19, 2018

Author(s): Hui Chen, Weizhu Chen, Bihong Hong, Yiping Zhang, Zhuan Hong, Ruizao Yi

Journal: Biomedical Chromatography

Abstract An ion chromatography method was established for detecting trehalose in rat plasma. The samples were analyzed using a CPMA1 column (250 × 4.0 mm, Thermo) with 120 mm NaOH as eluent at a flow rate of 0.7 mL/min. The standard curve was y = 1.4316x − 0.0654 (R = 0.9992), and the linear range was 0.2–10 mg/L. The relative standard deviations of within‐run and between‐run precisions at low, medium and high concentrations were within...

Read More thumbnail image: Determination of trehalose by ion chromatography and its application to a pharmacokinetic study in rats after intramuscular injection

Simultaneous qualitative and quantitative analysis of 11 active compounds in rhubarb using two reference substances by UHPLC

Published: Sep 19, 2018

Author(s): Anzhen Chen, Lei Sun, Hang Yuan, Aiying Wu, Jingguang Lu, Shuangcheng Ma

Journal: Journal of Separation Science

Abstract Multi‐component analysis is one of the key techniques for the overall quality control of traditional Chinese medicines. However, the shortage and high cost of reference substances are the greatest obstacles. The substitute method is an alternative solution. In the present study, 11 compounds of rhubarb were simultaneously determined by a method named “two reference substances for determination of multiple components”, which...

Read More thumbnail image: Simultaneous qualitative and quantitative analysis of 11 active compounds in rhubarb using two reference substances by UHPLC

Investigation of analysis methods for hyperpolarized 13C‐pyruvate metabolic MRI in prostate cancer patients

Published: Sep 19, 2018

Author(s): Peder E. Z. Larson, Hsin‐Yu Chen, Jeremy W. Gordon, Natalie Korn, John Maidens, Murat Arcak, Shuyu Tang, Mark Criekinge, Lucas Carvajal, Daniele Mammoli, Robert Bok, Rahul Aggarwal, Marcus Ferrone, James B. Slater, Sarah J. Nelson, John Kurhanewicz, Daniel B. Vigneron

Journal: NMR in Biomedicine

MRI using hyperpolarized (HP) carbon‐13 pyruvate is being investigated in clinical trials to provide non‐invasive measurements of metabolism for cancer and cardiac imaging. In this project, we applied HP [1‐13C]pyruvate dynamic MRI in prostate cancer to measure the conversion from pyruvate to lactate, which is expected to increase in aggressive cancers. The goal of this work was to develop and test analysis methods for improved quantification of...

Read More thumbnail image: Investigation of analysis methods for hyperpolarized 13Cpyruvate metabolic MRI in prostate cancer patients

Metabolism of vesatolimod in rat, dog, and human liver microsomes: Metabolic stability assessment, metabolite identification, and interspecies comparison

Published: Sep 17, 2018

Author(s): Wen Li, Jing Zhang, Yanping Wang, Fangdi Hu, Yinghua Zhang

Journal: Drug Testing and Analysis

Abstract Vesatolimod (GS‐9620) is an agonist of toll‐like receptor (TLR7) 7, which has been developed as an anti‐hepatitis B virus (HBV) agent. The focus of the present study is on the metabolic stability evaluation and metabolite identification of GS‐9620 in rat, dog, and human liver microsomes, as well as interspecies comparison. The average observed in vitro T1/2 values were 3.06, 13.06, and 15.56 minutes in rat, dog, and human liver...

Read More thumbnail image: Metabolism of vesatolimod in rat dog and human liver microsomes Metabolic stability assessment metabolite identification and interspecies comparison

Organic inclusions evidence, composition, and cathodoluminescence behaviour for the formation conditions of fluorapatite from Anemzi (Morocco)

Published: Sep 17, 2018

Author(s): Magdalena Dumańska‐Słowik, Aleksandra Wesełucha‐Birczyńska, Wiesław Heflik, Weronika Maksymiuk, Magdalena Sikorska‐Jaworowska

Journal: Journal of Raman Spectroscopy

Abstract Fluorapatite from Anemzi alkaline syenite hosts a wealth of solid organic inclusions, mainly of aliphatic (2,935–2,845 cm−1) and aromatic hydrocarbon compositions (3,100–3,000 cm−1), as well as traces of bituminous matter showing a low degree of ordering. The tiny inclusions built from oxides of titanium (rutile and anatase) are the only mineral phases found in host crystals. The two‐phase, liquid–gas fluid inclusions are composed ...

Read More thumbnail image: Organic inclusions evidence composition and cathodoluminescence behaviour for the formation conditions of fluorapatite from Anemzi Morocco

Assessment of the results of a three‐year program for National Standardization and Quality Improvement of Medical Laboratories on Drug of Abuse Testing by the Ministry of Health in Turkey

Published: Sep 17, 2018

Author(s): Tuncay Küme, Ferzane Mercan, Hatice Topsakal, Cigdem Karakukcu, Mehmet Şeneş, Aslı Pınar, Mukaddes Gürler, Hakan Kalafat, Belgin Ünal, Alain G. Verstraete, Yeşim Hamurtekin, Ahmet Aydınlı, Yasemin Şenol, Muhammed Ertuğrul Eğin, Alper Cihan, Elif Güler Kazancı, Eyüp Gümüş

Journal: Drug Testing and Analysis

Abstract The aim of this study is to assess the results of inspections in the last three years of drug abuse testing in medical laboratories according to the latest regulations in Turkey. The on‐site inspections of medical laboratories for drugs abuse testing performed in Alcohol and Drug Addiction Treatment Centers during 2014–2016 are described, and laboratory processes and performance evaluated. The performance of 35...

Read More thumbnail image: Assessment of the results of a threeyear program for National Standardization and Quality Improvement of Medical Laboratories on Drug of Abuse Testing by the Ministry of Health in Turkey

High vibrational overtone excitation‐induced conformational isomerization of glycolic acid in solid argon matrix

Published: Sep 17, 2018

Author(s): Jussi M.E. Ahokas, Iwona Kosendiak, Justyna Krupa, Maria Wierzejewska, Jan Lundell

Journal: Journal of Raman Spectroscopy

Abstract The high overtone‐induced isomerization of glycolic acid in a low‐temperature argon matrix was investigated using Raman spectroscopy. The Raman spectrum of glycolic acid is presented, and the spectral assignment is supported by vibrational anharmonic calculations. The high overtone excitation of the lowest energy conformer (SSC) at 532 nm induced direct conformational isomerization to higher energy conformers (GAC and...

Read More thumbnail image: High vibrational overtone excitationinduced conformational isomerization of glycolic acid in solid argon matrix

Alternate field evaporation by changing laser pulsing and voltage pulsing dynamically for atom probe analysis

Published: Sep 17, 2018

Author(s): M. Taniguchi, O. Nishikawa

Journal: Surface and Interface Analysis

Time‐of‐flight mass analysis in atom‐by‐atom scale is performed in atom probe (AP) by pulsed field evaporation of sample material. The pulsed field evaporation is triggered by superposing voltage pulse or shooting laser pulse together with stationary voltage for evaporation field. Voltage pulse which has been used from the establishment of AP in the 1960s is going to be replaced by short pulsed laser with high repetition rate in the...

Read More thumbnail image: Alternate field evaporation by changing laser pulsing and voltage pulsing dynamically for atom probe analysis

Numerical and experimental investigation of ‘water fan’ effect due to electrohydrodynamic force in a microchamber

Published: Sep 17, 2018

Author(s): Hai Jiang, Xu Yang, Na Fan, Bei Peng, Xuan Weng

Journal: ELECTROPHORESIS

Abstract Electrohydrodynamics is commonly used in microfluidics to control and manipulate the fluid. Though there are studies on the rotation flow in suspended films, the thin film liquid is easily broken and cannot last long hence not applicable in specific applications. Here, we established a three‐dimensional microchamber embedded with two pairs of microelectrodes to investigate the rotational phenomenon of bulk of liquid which...

Read More thumbnail image: Numerical and experimental investigation of water fan effect due to electrohydrodynamic force in a microchamber

Determination of kinetic parameters of redox reactions using CE‐ICP‐MS: A case study for the reduction of Np(V) by hydroxylamine hydrochloride

Published: Sep 17, 2018

Author(s): Christian Willberger, Samer Amayri, Tobias Reich

Journal: ELECTROPHORESIS

Abstract The rate constants k of the reduction of 5 × 10–5 M Np(V) to Np(IV) by hydroxylamine hydrochloride (HAHCl) in 1 M HCl have been determined by CE‐ICP‐MS in the temperature range of ϑ = 30–70°C and with varying concentrations of HAHCl from 1 to 7.2 M. The reaction was found to have (pseudo)first order kinetics with respect to HAHCl. The experimental results for k ranged from 0.0029(1) min−1...

Read More thumbnail image: Determination of kinetic parameters of redox reactions using CEICPMS A case study for the reduction of NpV by hydroxylamine hydrochloride

Dynamics of partially obstructed breakup of bubbles in microfluidic Y‐junctions

Published: Sep 17, 2018

Author(s): Xu Ziyi, Fu Taotao, Zhu Chunying, Jiang Shaokun, Ma Youguang, Wang Kai, Luo Guangsheng

Journal: ELECTROPHORESIS

Abstract For revealing the dynamics of partially obstructed breakup of bubbles in microfluidic Y‐junctions, the combination of dimensionless power‐law and geometric model was applied to study the effects of capillary number, bubble length, and channel angle on the bubble rupture process. In the squeezing process, the gas‐liquid interface curve follows the parabolic model. For the evolution of the bubble neck during breakup, the...

Read More thumbnail image: Dynamics of partially obstructed breakup of bubbles in microfluidic Yjunctions

Distinguishing enantiomeric amino acids with chiral cyclodextrin adducts and structures for lossless ion manipulations

Published: Sep 17, 2018

Author(s): Gabe Nagy, Christopher D. Chouinard, Isaac K. Attah, Ian K. Webb, Sandilya V. B. Garimella, Yehia M. Ibrahim, Erin S. Baker, Richard D. Smith

Journal: ELECTROPHORESIS

Abstract Enantiomeric molecular evaluations remain an enormous challenge for current analytical techniques. To date, derivatization strategies and long separation times are generally required in these studies, and the development and implementation of new approaches are needed to increase speed and distinguish currently unresolvable compounds. Herein, we describe a method using chiral cyclodextrin adducts and structures for lossless...

Read More thumbnail image: Distinguishing enantiomeric amino acids with chiral cyclodextrin adducts and structures for lossless ion manipulations

Raman spectroscopy of the eight natural carbonate minerals of calcite structure

Published: Sep 16, 2018

Author(s): William J.B. Dufresne, Carson J. Rufledt, Craig P. Marshall

Journal: Journal of Raman Spectroscopy

Abstract To date, only five natural carbonate minerals of calcite structure have been studied by Raman spectroscopy. These include calcite (CaCO3), magnesite (MgCO3), siderite (FeCO3), smithsonite (ZnCO3), and rhodochrosite (MnCO3). Thus far, only synthetic compounds of otavite (CdCO3), spherocobaltite (CoCO3), and gaspeite (NiCO3) have been investigated by Raman spectroscopy. However, the Raman spectra of natural otavite, spherocobaltite, and gaspeite ...

Read More thumbnail image: Raman spectroscopy of the eight natural carbonate minerals of calcite structure

Shifted‐excitation Raman difference spectroscopy for the detection of SERS‐encoded gold nanostar probes

Published: Sep 16, 2018

Author(s): Janna Register, Martin Maiwald, Andrew Fales, Pietro Strobbia, Bernd Sumpf, Tuan Vo‐Dinh

Journal: Journal of Raman Spectroscopy

Abstract In vivo applications of surface‐enhanced Raman spectroscopy (SERS) have limited sensitivity due to the intense background signal from real‐life complex samples such as plants and tissues. To overcome this issue, this work investigates the combination of shifted‐excitation Raman difference spectroscopy (SERDS) with SERS nanoprobes to generate background‐free SE‐SERDS spectra. The SERDS technique was performed with a...

Read More thumbnail image: Shiftedexcitation Raman difference spectroscopy for the detection of SERSencoded gold nanostar probes

A tool for assisting phase identification by micro‐Raman spectroscopy

Published: Sep 16, 2018

Author(s): G. R. Ramos, J. E. Zorzi, R. C. D. Cruz, C. A. Perottoni

Journal: Journal of Raman Spectroscopy

Abstract Although powder X‐ray diffraction is often the primary choice for the analysis of naturally occurring materials, the robust identification of individual components in a complex mixture is usually a challenging task, and other analytical tools are often needed to allow unequivocal phase identification. Among these techniques, the spatial resolution provided by micro‐Raman spectroscopy has proved to be invaluable as a...

Read More thumbnail image: A tool for assisting phase identification by microRaman spectroscopy

Mapping nanometer and micrometer‐scale structures at graphite surface by photoelectron diffraction

Published: Sep 14, 2018

Author(s): Yoshiki Fujita, Hiroshi Ota, Tomohiro Matsushita, Takayuki Muro, Yasunori Senba, Fumihiko Matsui

Journal: Surface and Interface Analysis

A series of C 1s photoelectron intensity angular distribution (PIAD) patterns from a crystalline graphite surface were mapped in two dimensions at intervals of 20 μm. Two kinds of PIAD patterns rotated by 30° from each other, corresponding to the two domains from the twinned crystal, were found. The standard deviation of the diffraction contrast was evaluated for each PIAD pattern from its intensity histogram. Surprisingly, we found...

Read More thumbnail image: Mapping nanometer and micrometerscale structures at graphite surface by photoelectron diffraction

Iterative deconvolution using the MRI model for removing experimental broadening and shift effects in SIMS depth profiles

Published: Sep 14, 2018

Author(s): Fayçal Boulsina, Brice Gautier

Journal: Surface and Interface Analysis

During the last years, depth resolution of secondary ion mass spectrometry (SIMS) has been enhanced, mainly by solving direct and inverse problems of depth profiling. The solution of both problems is based on the depth resolution function (DRF). Solving the direct problem is frequently done by using the DRF of the Mixing‐Roughness‐Information depth (MRI) model, and solving the inverse problem is frequently achieved by using the DRF...

Read More thumbnail image: Iterative deconvolution using the MRI model for removing experimental broadening and shift effects in SIMS depth profiles

Editorial for the ECASIA'17 proceedings

Published: Sep 14, 2018

Author(s): Philippe Marcus, Anouk Galtayries

Journal: Surface and Interface Analysis

Read More thumbnail image: Editorial for the ECASIA17 proceedings

Effect of anodizing conditions on the cell morphology of anodic films on AA2024‐T3 alloy

Published: Sep 14, 2018

Author(s): Jeanette M. Torrescano‐Alvarez, Michele Curioni, Xiaorong Zhou, Peter Skeldon

Journal: Surface and Interface Analysis

The effects of applied current density, anodizing time, and electrolyte temperature on the cell and pore morphology of anodic films and the voltage‐time response obtained during galvanostatic anodizing of AA2024‐T3 alloy in sulphuric acid electrolytes have been studied. Scanning electron microscopy was employed to observe the film morphology. Sponge‐like porous structure was promoted by anodizing at relatively low current density and high...

Read More thumbnail image: Effect of anodizing conditions on the cell morphology of anodic films on AA2024T3 alloy
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