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Influence of acid hydrolysis, saponification and sample clean‐up on the measurement of phytosterols in dairy cattle feed using GC–MS and GC with flame ionization detection

Published: Jul 31, 2018

Author(s): Samantha Duong, Norbert Strobel, Saman Buddhadasa, Katherine Stockham, Martin J. Auldist, William J. Wales, Peter J. Moate, John D. Orbell, Marlene J. Cran

Journal: Journal of Separation Science

Abstract The fortification of processed foods including dairy products is increasingly commonplace with phytosterols among many compounds used to improve the nutritional value of food products. It is also increasingly common practice for some dairy cattle feeds to be fortified for their potential to increase phytosterol levels in milk. In this study, a combined, streamlined protocol using acid hydrolysis, saponification and sample...

Read More thumbnail image: Influence of acid hydrolysis saponification and sample cleanup on the measurement of phytosterols in dairy cattle feed using GCMS and GC with flame ionization detection

Interactions between hydrogenated diamond surface and adsorbates with different concentration of NO 2 molecules: A first‐principles study

Published: Jul 31, 2018

Author(s): Fengbin Liu, Wenbin Chen, Yan Cui, Zhiwei Jiao, Min Qu, Leigang Cao

Journal: Surface and Interface Analysis

To elucidate the effects of NO2 and H2O molecules on the surface conductivity of hydrogenated diamond film, models of various adsorbates containing different molecular ratio of NO2 and H2O on hydrogenated diamond (100) surfaces were constructed. The adsorption energies, equilibrium geometries of adsorbates, density of states, and atomic Mulliken populations were studied by using first‐principles method. The results showed that H2O...

Read More thumbnail image: Interactions between hydrogenated diamond surface and adsorbates with different concentration of NO 2 molecules A firstprinciples study

Effect of 120 MeV Au 9+ ion irradiation on the structure and surface morphology of ZnO/NiO heterojunction

Published: Jul 31, 2018

Author(s): Pankaj Kumar Das, Rajib Biswal, Ram Janay Choudhary, Vasant Sathe, Vedachalaiyer Ganesan, Saif Ahmad Khan, Naresh Chandra Mishra, Pravanjan Mallick

Journal: Surface and Interface Analysis

ZnO/NiO thin films, each of thickness 100 nm, were deposited on Si(100) substrate by pulsed laser deposition method. The resulting heterojunction, ZnO/NiO/Si, was irradiated by 120‐MeV Au9+ ions and characterized by grazing incidence X‐ray diffraction (GIXRD), Raman spectroscopy, and atomic force microscopy (AFM). The GIXRD confirmed the presence of both NiO and ZnO in the samples. Ion irradiation induced suppression of crystalline nature, ...

Read More thumbnail image: Effect of 120 MeV Au 9 ion irradiation on the structure and surface morphology of ZnONiO heterojunction

Bombardment‐induced light emission of clean and oxygen‐covered Al, Cu, and Cu x Al 1‐x targets

Published: Jul 31, 2018

Author(s): Mohammed Ait El Fqih, Ahmad Afkir, Abdelaziz El Boujlaidi, Lamia Jadoual, Raja Jourdani, Abdelilah Kaddouri

Journal: Surface and Interface Analysis

Light emission during 5 keV Kr+ ion bombardment of Cu, Al, and CuAl alloys with different concentration is studied. The transient effect phenomenon has been investigated under two pressure conditions: one at base pressure (approximately 10−7 Pa) and the other with introduction of oxygen gas (approximately 10−4 Pa). The experimental oxygen sputtering yield was compared with simulation using the SRIM‐code program. Both of them were in...

Read More thumbnail image: Bombardmentinduced light emission of clean and oxygencovered Al Cu and Cu x Al 1x targets

Visualization of descriptive multiblock analysis

Published: Jul 31, 2018

Author(s): Tomas Skotare, Rickard Sjögren, Izabella Surowiec, David Nilsson, Johan Trygg

Journal: Journal of Chemometrics

Abstract Understanding and making the most of complex data collected from multiple sources is a challenging task. Data integration is the procedure of describing the main features in multiple data blocks, and several methods for multiblock analysis have been previously developed, including OnPLS and JIVE. One of the main challenges is how to visualize and interpret the results of multiblock analyses because of the increased model...

Read More thumbnail image: Visualization of descriptive multiblock analysis

Egg product freshness evaluation: A metabolomic approach

Published: Jul 30, 2018

Author(s): Daniele Cavanna, Dante Catellani, Chiara Dall'Asta, Michele Suman

Journal: Journal of Mass Spectrometry

Abstract Egg products' freshness is a crucial issue for the production of safe and high‐quality commodities. Up to now, this parameter is assessed with the quantification of few compounds, but the possibility to evaluate more molecules simultaneously could help to provide robust results. In this study, 31 compounds responsible of freshness and not freshness of egg products were selected with a metabolomic...

Read More thumbnail image: Egg product freshness evaluation A metabolomic approach

Detecting stress injury (fatigue fracture) in fibular cortical bone using quantitative ultrashort echo time‐magnetization transfer (UTE‐MT): An ex vivo study

Published: Jul 30, 2018

Author(s): Saeed Jerban, Yajun Ma, Amin Nazaran, Erik W. Dorthe, Esther Cory, Michael Carl, Darryl D'Lima, Robert L. Sah, Eric Y. Chang, Jiang Du

Journal: NMR in Biomedicine

Bone stress injury (BSI) incidents have been increasing amongst athletes in recent years as a result of more intense sporting activities. Cortical bone in the tibia and fibula is one of the most common BSI sites. Nowadays, clinical magnetic resonance imaging (MRI) is the recommended technique for BSI diagnosis at an early stage. However, clinical MRI focuses on edema observations in surrounding soft tissues, rather than the injured...

Read More thumbnail image: Detecting stress injury fatigue fracture in fibular cortical bone using quantitative ultrashort echo timemagnetization transfer UTEMT An ex vivo study

Rheological determinants for simultaneous staging of hepatic fibrosis and inflammation in patients with chronic liver disease

Published: Jul 30, 2018

Author(s): Ralph Sinkus, Simon Lambert, Khaled Z. Abd‐Elmoniem, Caryn Morse, Theo Heller, Christian Guenthner, Ahmed M. Ghanem, Sverre Holm, Ahmed M. Gharib

Journal: NMR in Biomedicine

The purpose of this study is to investigate the use of fundamental rheological parameters as quantified by MR elastography (MRE) to measure liver fibrosis and inflammation simultaneously in humans. MRE was performed on 45 patients at 3 T using a vibration frequency of 56 Hz. Fibrosis and inflammation scores were obtained from liver biopsies. Biomechanical properties were quantified in terms of complex shear...

Read More thumbnail image: Rheological determinants for simultaneous staging of hepatic fibrosis and inflammation in patients with chronic liver disease

Combination of sugar and stable isotopes analyses to detect the use of nongrape sugars in balsamic vinegar must

Published: Jul 30, 2018

Author(s): Matteo Perini, Tiziana Nardin, Federica Camin, Mario Malacarne, Roberto Larcher

Journal: Journal of Mass Spectrometry

Abstract “Aceto Balsamico di Modena” (ABM) is a protected geographical indication salad dressing obtained from cooked and/or concentrated grape must, with the addition of wine vinegar and a maximum of 2% caramel (EU Reg 583/2009). In this study, we investigated whether the combination of 13C/12C of ethanol using isotope ratio mass spectrometry with 2H‐site‐specific natural isotope fractionation–nuclear magnetic resonance...

Read More thumbnail image: Combination of sugar and stable isotopes analyses to detect the use of nongrape sugars in balsamic vinegar must

Development of an analytical strategy to identify and classify the global chemical constituents of Ziziphi Spinosae Semen by using UHPLC with quadrupole time‐of‐flight mass spectrometry combined with multiple data‐processing approaches

Published: Jul 29, 2018

Author(s): Xiaochai Zhu, Xiao Liu, Ke Pei, Yu Duan, Hui Zhu, Jia Ma, Yinghui Xu, Zejun Wu, Qigang Zhou, Baochang Cai

Journal: Journal of Separation Science

Abstract According to traditional Chinese medical theory, Ziziphi Spinosae Semen needs to be stir‐fried before clinical application for its sedative‐hypnotic effect enhancement. A rapid and comprehensive analysis strategy of ultra high performance liquid chromatography with quadrupole time‐of‐flight mass spectrometry and multiple data analysis platforms was developed for the efficient and sensitive identification of components in...

Read More thumbnail image: Development of an analytical strategy to identify and classify the global chemical constituents of Ziziphi Spinosae Semen by using UHPLC with quadrupole timeofflight mass spectrometry combined with multiple dataprocessing approaches

Simultaneous determination of total homocysteine, cysteine, glutathione, and N ‐acetylcysteine in brain homogenates by HPLC

Published: Jul 29, 2018

Author(s): Adrianna Kamińska, Patrycja Olejarz, Kamila Borowczyk, Rafał Głowacki, Grażyna Chwatko

Journal: Journal of Separation Science

Abstract We have developed a simple, fast, accurate, and cheap method for the simultaneous determination of total cysteine, homocysteine, glutathione, and N‐acetylcysteine in brain homogenates based on the reduction of disulfide bonds by tris(2‐carboxyethyl) phosphine, pre‐column derivatization of free thiol groups with 2‐chloro‐1‐methylquinolinium tetrafluoroborate followed by ion‐pair reversed‐phase high‐performance liquid...

Read More thumbnail image: Simultaneous determination of total homocysteine cysteine glutathione and N acetylcysteine in brain homogenates by HPLC

Chromatographic method for the simultaneous quantification of dapsone and clofazimine in nanoformulations

Published: Jul 29, 2018

Author(s): Sandia Machado, Sara R. Fernandes, Luise L. Chaves, Sofia A. C. Lima, Eduarda M. P. Silva, Luísa Barreiros, Salette Reis, Marcela A. Segundo

Journal: Journal of Separation Science

Abstract The low bioavailability and nonspecific distribution of dapsone and clofazimine, commonly applied in combination for the treatment of leprosy, can produce toxic effects. Nanotechnological approaches enhance the delivery of these drugs. Therefore, a high‐performance liquid chromatography method was developed for the simultaneous determination of dapsone and clofazimine loaded in nanoformulations for quality control purposes....

Read More thumbnail image: Chromatographic method for the simultaneous quantification of dapsone and clofazimine in nanoformulations

A sensitive, high‐throughput, and eco‐friendly analysis of daidzein and its valine carbamate prodrug in rat plasma by supercritical fluid chromatography with tandem mass spectrometry

Published: Jul 29, 2018

Author(s): Yingchao Li, Xingxing Zhang, Xiaochen Bai, Xiaoting Li, Qikun Jiang, Tianhong Zhang

Journal: Journal of Separation Science

Abstract A valine carbamate prodrug of daidzein was synthesized to improve its bioavailability because of the poor solubility and low permeability of daidzein. To evaluate the pharmacokinetic behavior of the prodrug, a sensitive and high‐throughput method was developed and validated for the simultaneous determination of daidzein and its prodrug in rat plasma. The samples were extracted by ethyl acetate and then analyzed by a...

Read More thumbnail image: A sensitive highthroughput and ecofriendly analysis of daidzein and its valine carbamate prodrug in rat plasma by supercritical fluid chromatography with tandem mass spectrometry

The microemulsion electrokinetic capillary chromatography combined with reversed‐electrode polarity stacking mode for enriching and quantifying lignanoids and ginsenosides in TCMs preparation Shengmai injection

Published: Jul 29, 2018

Author(s): Huifen Ma, Jin Li, Heshui Yu, Zheng Li, Xiu‐mei Gao, Yan‐xu Chang

Journal: ELECTROPHORESIS

Abstract An on‐line large volume sample stacking with polarity switching (LVSS) method was proposed for simultaneously determining lignanoids and ginsenosides in MEEKC. The parameters including the pH value and concentration of buffer solution, SDS, organic modifier, oil phase, running voltage, and temperature as well as injection time, sample matrix, stacking voltage, and time influencing separation and stacking were systematically...

Read More thumbnail image: The microemulsion electrokinetic capillary chromatography combined with reversedelectrode polarity stacking mode for enriching and quantifying lignanoids and ginsenosides in TCMs preparation Shengmai injection

Dispersive liquid–liquid microextraction of five chlorophenols in water samples followed by determination using capillary electrophoresis

Published: Jul 27, 2018

Author(s): Fangfang Gao, Wenhui Lu, Huitao Liu, Jinhua Li, Lingxin Chen

Journal: ELECTROPHORESIS

Abstract Dispersive liquid–liquid microextraction (DLLME) coupled with CE was developed for simultaneous determination of five types of chlorophenols (CPs), namely 2‐chlorophenol (2‐CP), 4‐chlorophenol (4‐CP), 2,4‐dichlorophenol (2,4‐DCP), 2,6‐dichlorophenol (2,6‐DCP), and 2,4,6‐trichlorophenol (2,4,6‐TCP) in water samples. Several parameters affecting DLLME and CE conditions were systematically investigated. Under the optimized...

Read More thumbnail image: Dispersive liquidliquid microextraction of five chlorophenols in water samples followed by determination using capillary electrophoresis

A robust deconvolution method to disentangle multiple water pools in diffusion MRI

Published: Jul 27, 2018

Author(s): Alberto De Luca, Alexander Leemans, Alessandra Bertoldo, Filippo Arrigoni, Martijn Froeling

Journal: NMR in Biomedicine

The diffusion‐weighted magnetic resonance imaging (dMRI) signal measured in vivo arises from multiple diffusion domains, including hindered and restricted water pools, free water and blood pseudo‐diffusion. Not accounting for the correct number of components can bias metrics obtained from model fitting because of partial volume effects that are present in, for instance, diffusion tensor imaging (DTI) and diffusion kurtosis imaging (DKI)....

Read More thumbnail image: A robust deconvolution method to disentangle multiple water pools in diffusion MRI

High‐resolution echo‐planar spectroscopic imaging at ultra‐high field

Published: Jul 27, 2018

Author(s): Eduardo Coello, Ralph Noeske, Brian L. Burns, Jeremy W. Gordon, Angela Jakary, Bjoern Menze, Axel Haase, Peder E.Z. Larson, Yan Li, Rolf F. Schulte

Journal: NMR in Biomedicine

MR spectroscopic imaging (MRSI) at ultra‐high field (≥7 T) benefits from improved sensitivity that allows the detection of low‐concentration metabolites in the brain. However, optimized acquisition techniques are required to overcome inherent limitations of MRSI at ultra‐high field. This work describes an optimized method for fast high‐resolution 1H‐MRSI of the brain at 7 T. The proposed acquisition sequence combines precise volume...

Read More thumbnail image: Highresolution echoplanar spectroscopic imaging at ultrahigh field

Brain investigations of rodent disease models by chemical exchange saturation transfer at 21.1 T

Published: Jul 27, 2018

Author(s): Tangi Roussel, Jens T. Rosenberg, Samuel C. Grant, Lucio Frydman

Journal: NMR in Biomedicine

This study explores opportunities opened up by ultrahigh fields for in vivo saturation transfer brain magnetic resonance imaging experiments. Fast spin‐echo images weighted by chemical exchange saturation transfer (CEST) effects were collected on Sprague–Dawley rats at 21.1 T, focusing on two neurological models. One involved a middle cerebral artery occlusion emulating ischemic stroke; the other involved xenografted glioma cells...

Read More thumbnail image: Brain investigations of rodent disease models by chemical exchange saturation transfer at 21_1T

Study of the chromatographic parameters of ultra‐high‐performance supercritical fluid chromatography and method development using a design of experiments approach for the quantification of pesticides in lettuce

Published: Jul 26, 2018

Author(s): Karen Priscila de Lima, Isabel Cristina Sales Fontes Jardim, Márcia Cristina Breitkreitz

Journal: Journal of Separation Science

Abstract We examine the potential of ultra‐high‐performance supercritical fluid chromatography for multiresidue quantification of ten pesticides commonly applied to lettuce and compares it to ultra‐high‐performance liquid chromatography. Initially, a thorough study of the stationary and mobile phase composition and injection solvent was carried out. In a second step, a chemometric approach based on design of experiments was used to...

Read More thumbnail image: Study of the chromatographic parameters of ultrahighperformance supercritical fluid chromatography and method development using a design of experiments approach for the quantification of pesticides in lettuce

Role of Auger electrons in X‐ray excitation by electron beam

Published: Jul 26, 2018

Author(s): Gely V. Pavlinsky, Yury G. Lavrent'ev

Journal: X-Ray Spectrometry

We present an algorithm that allows an estimation of the number of ionizations of atoms with low atomic number by Auger electrons produced in the matrix during excitation of X‐rays by an electron beam. The dependence of Auger ionization on the atomic number of the matrix has a maximum resulting from the increasing energy of Auger electrons and the decrease of their number as a function of the atomic number. Dependence of the contribution...

Read More thumbnail image: Role of Auger electrons in Xray excitation by electron beam
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