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Graphene oxide layers modified by irradiation with 1.0 MeV Au + ions

Published: May 28, 2018

Author(s): Petr Malinský, Mariapompea Cutroneo, Anna Macková, Vladimir Hnatowicz, Kateřina Szökölová, Marie Bohačová, Jan Luxa, Zdeněk Sofer

Journal: Surface and Interface Analysis

Graphene oxide (GO) foils were modified by irradiation using 1.0 MeV Au+ ions, and their elemental composition before and after the ion irradiation was investigated using Rutherford back‐scattering spectroscopy (RBS). The surface morphology was studied using SEM, and changes in elemental composition and structure of GO in shallow subsurface were characterized by various spectroscopy techniques including X‐ray photoelectron spectroscopy and ...

Read More thumbnail image: Graphene oxide layers modified by irradiation with 1_0 MeV Au  ions

Probing the molecular regulation of lipopolysaccharide stress in piglet liver by comparative proteomics analysis

Published: May 28, 2018

Author(s): Bing Xia, Qingshi Meng, Xiaohui Feng, Xiangfang Tang, Anfeng Jia, Jinghai Feng, Sheng Zhang, Hongfu Zhang

Journal: ELECTROPHORESIS

Abstract Lipopolysaccharide (LPS) can induce inflammatory responses in piglets, causing immunological stress and tissue damage. However, chronic LPS infection may lead to LPS‐induced immunological stress resistance. The molecular mechanisms underlying LPS stress have not been fully elucidated. Here, we conducted a global comparative proteomics analysis to investigate the molecular regulation of LPS stress using an immunological...

Read More thumbnail image: Probing the molecular regulation of lipopolysaccharide stress in piglet liver by comparative proteomics analysis

MA‐XRF study of 15th–17th century icons from the collection of the National Museum in Krakow, Poland

Published: May 27, 2018

Author(s): Małgorzata Walczak, Dominika Tarsińska‐Petruk, Michał Płotek, Maria Goryl, Mirosław P. Kruk

Journal: X-Ray Spectrometry

In 2015, the National Museum in Krakow, Poland, started a grant from the National Programme for the Development of Humanities, its goal to investigate an important collection of old Orthodox painting, including more than 50 15th to 17th century icons originating from the territory of the historical Orthodox Diocese of Przemyśl within the borders of the Polish Kingdom. The aim of researching the iconography,...

Read More thumbnail image: MAXRF study of 15th17th century icons from the collection of the National Museum in Krakow Poland

A liquid chromatography–tandem mass spectrometry method for the determination of cocaine and metabolites in blood and in dried blood spots collected from postmortem samples and evaluation of the stability over a 3‐month period

Published: May 25, 2018

Author(s): Matteo Moretti, Silvia Damiana Visonà, Francesca Freni, Ilaria Tomaciello, Claudia Vignali, Angelo Groppi, Luca Tajana, Antonio Marco Maria Osculati, Luca Morini

Journal: Drug Testing and Analysis

Abstract The aims of this study were (1) to identify and quantify cocaine (COC), benzoylecgonine (BE), ecgonine methyl ester (EME), and cocaethylene (CE) in DBS; (2) to compare dried blood spots (DBSs) analytical results with the routine blood analyses; (3) to monitor analytes stability on DBS within a 3‐month period. Eighty‐five μL of blood from postmortem cases were put on a card for DBS analysis and kept in the dark, at room...

Read More thumbnail image: A liquid chromatographytandem mass spectrometry method for the determination of cocaine and metabolites in blood and in dried blood spots collected from postmortem samples and evaluation of the stability over a 3month period

Continuous wave electron paramagnetic resonance of nitroxide biradicals in fluid solution

Published: May 25, 2018

Author(s): Sandra S. Eaton, Lukas B. Woodcock, Gareth R. Eaton

Journal: Concepts in Magnetic Resonance Part A

Abstract Nitroxide biradicals have been prepared with electron‐electron spin‐spin exchange interaction, J, ranging from weak to very strong. EPR spectra of these biradicals in fluid solution depend on the ratio of J to the nitrogen hyperfine coupling, AN, and the rates of interconversion between conformations with different values of J. For relatively rigid biradicals EPR spectra can be simulated as the superposition of AB splitting patterns arising from different...

Read More thumbnail image: Continuous wave electron paramagnetic resonance of nitroxide biradicals in fluid solution

A microfluidic glucose sensor incorporating a novel thread‐based electrode system

Published: May 24, 2018

Author(s): Michelle Gaines, Maria Jose Gonzalez‐Guerrero, Kathryn Uchida, Frank A. Gomez

Journal: ELECTROPHORESIS

Abstract An electrochemical sensor for the detection of glucose using thread‐based electrodes and fabric is described. This device is relatively simple to fabricate and can be used for multiple readings after washing with ethanol. The fabrication of the chip consisted of two steps. First, three thread‐based electrodes (reference, working, and counter) were fabricated by painting pieces of nylon thread with either layered silver ink...

Read More thumbnail image: A microfluidic glucose sensor incorporating a novel threadbased electrode system

Multivariate optimization and characterization of simultaneous removal of binary mixture of Cu(II) and Pb(II) using Fe 3 O 4 @MoS 2 nanoparticles

Published: May 24, 2018

Author(s): Javad Zolgharnein, Mahdieh Rastgordani

Journal: Journal of Chemometrics

Abstract In this study, a facile hydrothermal method was used for the synthesis of Fe3O4@MoS2 magnetic nanoparticles. Then, this compound was used as an efficient adsorbent for the simultaneous removal of Cu(II) and Pb(II) ions from water. The prepared nanoparticles were characterized by scanning electron microscopy, X‐ray diffraction, vibrating sample magnetometer, and Fourier transform infrared spectroscopy. In addition, the effect of...

Read More thumbnail image: Multivariate optimization and characterization of simultaneous removal of binary mixture of CuII and PbII using Fe 3 O 4 MoS 2 nanoparticles

Phase I metabolism of the carbazole‐derived synthetic cannabinoids EG‐018, EG‐2201, and MDMB‐CHMCZCA and detection in human urine samples

Published: May 23, 2018

Author(s): Lukas Mogler, Florian Franz, Maurice Wilde, Laura M. Huppertz, Sebastian Halter, Verena Angerer, Bjoern Moosmann, Volker Auwärter

Journal: Drug Testing and Analysis

Abstract Synthetic cannabinoids (SCs) are a structurally diverse class of new psychoactive substances. Most SCs used for recreational purposes are based on indole or indazole core structures. EG‐018 (naphthalen‐1‐yl(9‐pentyl‐9H‐carbazol‐3‐yl)methanone), EG‐2201 ((9‐(5‐fluoropentyl)‐9H‐carbazol‐3‐yl)(naphthalen‐1‐yl)methanone), and MDMB‐CHMCZCA (methyl 2‐(9‐(cyclohexylmethyl)‐9H‐carbazole‐3‐carboxamido)‐3,3‐dimethylbutanoate) are 3 representatives of a...

Read More thumbnail image: Phase I metabolism of the carbazolederived synthetic cannabinoids EG018 EG2201 and MDMBCHMCZCA and detection in human urine samples

Synthesis, analytical characterization, and monoamine transporter activity of the new psychoactive substance 4‐methylphenmetrazine (4‐MPM), with differentiation from its ortho ‐ and meta ‐ positional isomers

Published: May 23, 2018

Author(s): Gavin McLaughlin, Michael H. Baumann, Pierce V. Kavanagh, Noreen Morris, John D. Power, Geraldine Dowling, Brendan Twamley, John O'Brien, Gary Hessman, Folker Westphal, Donna Walther, Simon D. Brandt

Journal: Drug Testing and Analysis

Abstract The availability of new psychoactive substances (NPS) on the recreational drug market continues to create challenges for scientists in the forensic, clinical and toxicology fields. Phenmetrazine (3‐methyl‐2‐phenylmorpholine) and an array of its analogs form a class of psychostimulants that are well documented in the patent and scientific literature. The present study reports on two phenmetrazine analogs that have been...

Read More thumbnail image: Synthesis analytical characterization and monoamine transporter activity of the new psychoactive substance 4methylphenmetrazine 4MPM with differentiation from its ortho  and meta  positional isomers

Multi‐similarity measurement driven ensemble just‐in‐time learning for soft sensing of industrial processes

Published: May 22, 2018

Author(s): Xiaofeng Yuan, Jiao Zhou, Yalin Wang, Chunhua Yang

Journal: Journal of Chemometrics

Abstract Just‐in‐time learning (JITL) technique has been widely used for adaptive soft sensing of nonlinear processes. It builds online local model with the most relevant samples from historical dataset whenever a query sample comes. Hence, the prediction performance greatly depends on the similarity measurement for relevant sample selection. Different similarity measurements have been developed for sample selection in the past...

Read More thumbnail image: Multisimilarity measurement driven ensemble justintime learning for soft sensing of industrial processes

Quality evaluation of six bioactive constituents in goji berry based on capillary electrophoresis field amplified sample stacking

Published: May 21, 2018

Author(s): Wei‐Feng Wang, Jun‐Li Yang, Yan‐Ping Shi

Journal: ELECTROPHORESIS

Abstract Goji berry, fruits of the plant Lycium barbarum L., has long been used as traditional medicine and functional food in China. In this work, a simple and easy‐operation on‐line concentration capillary electrophoresis (CE) for detection flavonoids in goji berry was developed by coupling of field amplified sample stacking (FASS) with an electroosmotic (EOF) pump driving water removal process. Due to the EOF pump and electrokinetic ...

Read More thumbnail image: Quality evaluation of six bioactive constituents in goji berry based on capillary electrophoresis field amplified sample stacking

Different theoretical approaches at optical characterization of randomly rough silicon surfaces covered with native oxide layers

Published: May 21, 2018

Author(s): Ivan Ohlídal, Jiří Vohánka, Jan Mistrík, Martin Čermák, Daniel Franta

Journal: Surface and Interface Analysis

Results of the optical characterization of randomly rough silicon surfaces covered with native oxide layers based on processing experimental data obtained by ellipsometry and reflectometry are presented. It is shown that the Rayleigh‐Rice theory is suitable theoretical approach for characterizing micro‐rough surfaces in contrast to effective medium approximation. Combination of the Rayleigh‐Rice theory and scalar diffraction theory is...

Read More thumbnail image: Different theoretical approaches at optical characterization of randomly rough silicon surfaces covered with native oxide layers

Stiffness reconstruction methods for MR elastography

Published: May 18, 2018

Author(s): Daniel Fovargue, David Nordsletten, Ralph Sinkus

Journal: NMR in Biomedicine

Assessment of tissue stiffness is desirable for clinicians and researchers, as it is well established that pathophysiological mechanisms often alter the structural properties of tissue. Magnetic resonance elastography (MRE) provides an avenue for measuring tissue stiffness and has a long history of clinical application, including staging liver fibrosis and stratifying breast cancer malignancy. A vital component of MRE consists of the...

Read More thumbnail image: Stiffness reconstruction methods for MR elastography

Analysis of buried interfaces in multilayer device structures with hard XPS (HAXPES) using a CrKα source

Published: May 18, 2018

Author(s): O. Renault, E. Martinez, C. Zborowski, J. Mann, R. Inoue, J. Newman, K. Watanabe

Journal: Surface and Interface Analysis

Applications of laboratory hard X‐ray photoelectron spectroscopy on buried interfaces in devices are presented. We use a novel spectrometer fitted with a monochromated CrKα source (photon energy: 5414.9 eV) and a high‐voltage analyzer. Elements buried at depths as deep as 25 nm underneath various overlayers such as Al/Ta and Pt/Ti are detected and quantified from survey spectra, with chemical shifts accessible from...

Read More thumbnail image: Analysis of buried interfaces in multilayer device structures with hard XPS HAXPES using a CrK source

Development of a reversed phase liquid chromatographic method for analysis of pyridoxal‐5′‐phosphate and its impurities

Published: May 17, 2018

Author(s): Marwa Fouad Mansour, Micheal Assefa, Ahmed El‐Khouly, Peixi Zhu, Ann Van Schepdael, Erwin Adams

Journal: ELECTROPHORESIS

Abstract Since no proper method is available in literature for the analysis of pyridoxal‐5′‐phosphate, a reversed phase liquid chromatographic method was developed and validated for specificity, sensitivity, linearity, precision and accuracy. Nine potential related substances and forced degradation products could be successfully separated from the main peak. The separation was achieved on a Polaris C18 column...

Read More thumbnail image: Development of a reversed phase liquid chromatographic method for analysis of pyridoxal5phosphate and its impurities

The analysis of thermal and anodic oxide layers on selected biocompatible titanium alloys

Published: May 17, 2018

Author(s): Jan Krčil, Zdeněk Rafaj, Vladimír Mára, Stanislav Krum, Vladimír Starý, Václav Nehasil, Jana Sobotová

Journal: Surface and Interface Analysis

In the case of titanium alloys, the oxide layers on their surfaces strongly influence biocompatibility and corrosion resistance. To improve these characteristics, properties of oxide layers prepared by various methods on different base materials were examined. In this work, samples of widely used biomaterials, CP titanium grade 2 and alloy Ti6Al4V, were compared with recently developed β‐titanium alloy Ti‐39 wt% Nb. On the...

Read More thumbnail image: The analysis of thermal and anodic oxide layers on selected biocompatible titanium alloys

LaFeO 3 thin films as relevant models for the surface investigation of 3‐way catalysts

Published: May 17, 2018

Author(s): Shreya Nandi, Dimitri Blanck, Thomas Carlier, Marie‐Hélène Chambrier, Anne‐Sophie Mamede, Martine Trentesaux, Pardis Simon, Nicolas Nuns, Pascal Roussel, Anthony Ferri, Jean‐Francois Paul, Elise Berrier

Journal: Surface and Interface Analysis

Lanthanum orthoferrite, a highly potential 3‐way catalyst, shaped as a polycrystalline thin film has been comprehensively analysed by combining bulk and surface characterization techniques. The possibility to accomplish unprecedented surface information has been presented, thanks to the combined use of LEIS, XPS, and ToF‐SIMS. The structural, morphological, and surface properties at nanometric scale make such thin films indistinguishable...

Read More thumbnail image: LaFeO 3 thin films as relevant models for the surface investigation of 3way catalysts

Recognizing drug‐facilitated crimes: Detection and quantification of benzodiazepines in beverages using fast liquid–liquid extraction with low temperature partitioning and paper spray mass spectrometry

Published: May 16, 2018

Author(s): Camila Paula, Marina Jurisch, Evandro Piccin, Rodinei Augusti

Journal: Drug Testing and Analysis

Abstract A novel methodology using liquid–liquid extraction with low temperature partitioning (LLE–LTP) and paper spray mass spectrometry (PS–MS) was developed to identify and quantify benzodiazepines in beverages. Four types of alcoholic beverages usually consumed in parties and bars were spiked with 5 distinct benzodiazepines (diazepam, alprazolam, bromazepam, clonazepam, and cloxazolam) simulating a drug‐facilitated crime...

Read More thumbnail image: Recognizing drugfacilitated crimes Detection and quantification of benzodiazepines in beverages using fast liquidliquid extraction with low temperature partitioning and paper spray mass spectrometry

Characterisation of aqueous waste produced during the clandestine production of amphetamine following the Leuckart route utilising solid‐phase extraction gas chromatography–mass spectrometry and capillary electrophoresis with contactless conductivity detection

Published: May 16, 2018

Author(s): Frank M. Hauser, Janneke W. Hulshof, Thorsten Rößler, Ralf Zimmermann, Michael Pütz

Journal: Drug Testing and Analysis

Abstract Chemical waste from the clandestine production of amphetamine is of forensic and environmental importance due to its illegal nature which often leads to dumping into the environment. In this study, 27 aqueous amphetamine waste samples from controlled Leuckart reactions performed in Germany, the Netherlands, and Poland were characterised to increase knowledge about the chemical composition and physicochemical characteristics...

Read More thumbnail image: Characterisation of aqueous waste produced during the clandestine production of amphetamine following the Leuckart route utilising solidphase extraction gas chromatographymass spectrometry and capillary electrophoresis with contactless conductivity detection

Chemometric Strategies for Peak Detection and Profiling from Multidimensional Chromatography

Published: May 15, 2018

Author(s): Meritxell Navarro‐Reig, Carmen Bedia, Romà Tauler, Joaquim Jaumot

Journal: PROTEOMICS

Abstract The increasing complexity of omics research has encouraged the development of new instrumental technologies able to deal with these challenging samples. In this way, the rise of multidimensional separations should be highlighted due to the massive amounts of information that provide with an enhanced analyte determination. Both proteomics and metabolomics benefit from this higher separation capacity achieved when different...

Read More thumbnail image: Chemometric Strategies for Peak Detection and Profiling from Multidimensional Chromatography
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