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An optimized microfluidic paper‐based NiOOH/Zn alkaline battery

Published: Jul 4, 2018

Author(s): Samantha Burrola, Maria Jose Gonzalez‐Guerrero, Ani Avoundjian, Frank A. Gomez

Journal: ELECTROPHORESIS

Abstract In this paper, an alkaline nickel oxide hydroxide/zinc (NiOOH/Zn) battery featuring a cellulose matrix separator between electrodes is presented. The metallic electrodes and the paper separator are inserted in a layer‐by‐layer assembly that provides mechanical stability to the system resulting in a lightweight and easy‐to‐use device. The battery was optimized for the amount of NiOOH‐ink used at the cathode (11.1 mg/cm2) and...

Read More thumbnail image: An optimized microfluidic paperbased NiOOHZn alkaline battery

Complementarity of electrophoretic, mass spectrometric, and gene sequencing techniques for the diagnosis and characterization of congenital disorders of glycosylation

Published: Jul 4, 2018

Author(s): Arnaud Bruneel, Sophie Cholet, Valérie Drouin‐Garraud, Marie‐Line Jacquemont, Aline Cano, André Mégarbané, Coralie Ruel, David Cheillan, Thierry Dupré, Sandrine Vuillaumier‐Barrot, Nathalie Seta, François Fenaille

Journal: ELECTROPHORESIS

Abstract Congenital disorders of glycosylation (CDG) are rare autosomal genetic diseases affecting the glycosylation of proteins and lipids. Since CDG‐related clinical symptoms are classically extremely variable and nonspecific, a combination of electrophoretic, mass spectrometric, and gene sequencing techniques is often mandatory for obtaining a definitive CDG diagnosis, as well as identifying causative gene mutations and...

Read More thumbnail image: Complementarity of electrophoretic mass spectrometric and gene sequencing techniques for the diagnosis and characterization of congenital disorders of glycosylation

T‐Hg 2+ ‐T‐based satellite structured surface enhanced Raman scattering sensor for Hg 2+ detection

Published: Jul 3, 2018

Author(s): Zhenli Sun, Jingjing Du, Kebin He, Chuanyong Jing

Journal: Journal of Raman Spectroscopy

Abstract Mercury ion (Hg2+) exposure is a threat to human health. We report a plasmonic core‐satellite Fe3O4@SiO2‐Au (FA) hetero nanostructure for Hg2+ detection using surface enhanced Raman scattering based on the T‐Hg2+‐T strategy. The FA nanostructure was functionalized by a DNA aptamer, which was designed with Cy5 at the 5′ end, and used as a Raman reporter to specifically bind to Hg2+ ions. In the presence of Hg2+, DNA formed a hairpin structure,...

Read More thumbnail image: THg 2 Tbased satellite structured surface enhanced Raman scattering sensor for Hg 2 detection

Enantiomeric resolution of methylamphetamine and ephedrine: Does this affect the δ 13 C, δ 15 N, and δ 2 H stable isotope ratios of the product?

Published: Jul 3, 2018

Author(s): Alexandra K. Grzechnik, Adrian V. George, Linda Mitchell, Michael Collins, Helen Salouros

Journal: Drug Testing and Analysis

Abstract The use of stable isotope ratio mass spectrometry (IRMS) as a profiling tool for methylamphetamine has evolved over the last decade. Stable isotope ratios of carbon (δ13C), nitrogen (δ15N), and hydrogen (δ2H) of methylamphetamine are useful in determining the precursor used to manufacture methylamphetamine, and in many cases the synthetic origin of the methylamphetamine precursor. More recently, samples of seized methylamphetamine show...

Read More thumbnail image: Enantiomeric resolution of methylamphetamine and ephedrine Does this affect the  13 C  15 N and  2 H stable isotope ratios of the product

Increasing specificity of tandem mass spectrometry by laser‐induced dissociation

Published: Jul 2, 2018

Author(s): Marion Girod

Journal: Rapid Communications in Mass Spectrometry

Mass spectrometry offers an arsenal of tools for diverse proteomic investigations. This perspective article reviews some of the recent developments in the field of coupling laser‐induced dissociation with mass spectrometry (LID‐MS). Strategies involving labelling with a chromophore to induce specific photo‐absorption properties are considered, with a focus on specific amino acid derivatization. Some of the opportunities and challenges of...

Read More thumbnail image: Increasing specificity of tandem mass spectrometry by laserinduced dissociation

Review and perspectives on the applications of mass spectrometry imaging under ambient conditions

Published: Jul 2, 2018

Author(s): Consuelo J. Perez, Aafreen K. Bagga, Shamina S. Prova, Maryam Yousefi Taemeh, Demian R. Ifa

Journal: Rapid Communications in Mass Spectrometry

Ambient mass spectrometry (AMS)‐based techniques are performed under ambient conditions in which the ionization and desorption occur in the open environment allowing the direct analysis of molecules with minimal or no sample preparation. A selected group of AMS techniques demonstrate imaging capabilities that can provide information about the localization of molecules on complex sample surfaces such as biological tissues. 2D, 3D, and...

Read More thumbnail image: Review and perspectives on the applications of mass spectrometry imaging under ambient conditions

Drug–drug interaction and doping: Effect of non‐prohibited drugs on the urinary excretion profile of methandienone

Published: Jul 1, 2018

Author(s): Monica Mazzarino, Franziska L. Khevenhüller‐Metsch, Ilaria Fiacco, Maria Kristina Parr, Xavier Torre, Francesco Botrè

Journal: Drug Testing and Analysis

Abstract The potential consequences of drug–drug interactions on the excretion profile of the anabolic androgenic steroid methandienone (17β‐hydroxy‐17α‐methylandrosta‐1,4‐dien‐3‐one) are discussed. More specifically, we have evaluated by in vitro and in vivo experiments the effects of 7 non‐prohibited drugs (fluconazole, ketoconazole, itraconazole, miconazole, fluoxetine, paroxetine, and nefazodone) on the main metabolic pathways of...

Read More thumbnail image: Drugdrug interaction and doping Effect of nonprohibited drugs on the urinary excretion profile of methandienone

Precise control of distance between plasmonic surface‐enhanced Raman scattering substrate and analyte molecules with polyelectrolyte layers

Published: Jul 1, 2018

Author(s): Ekaterina S. Prikhozhdenko, Daniil N. Bratashov, Vsevolod S. Atkin, Roman A. Kamyshinsky, Alexander L. Vasiliev, Boris N. Khlebtsov, Dmitry A. Gorin, Helmuth Möhwald, Alexey M. Yashchenok

Journal: Journal of Raman Spectroscopy

Abstract The dependence of the surface‐enhanced Raman scattering (SERS) activity of small and large molecules on the number of polyelectrolyte monolayers covering the surface of gold nanocages (AuNCs) is investigated. The linkage of AuNCs to silica microparticles and the covering of its surface with additional polyelectrolyte layers are performed via layer‐by‐layer self‐assembly. Either three‐dimensional core–shell composite...

Read More thumbnail image: Precise control of distance between plasmonic surfaceenhanced Raman scattering substrate and analyte molecules with polyelectrolyte layers

Raman spectroscopy of neutron irradiated silicon carbide: C orrelation among R aman spectra, swelling, and irradiation temperature

Published: Jul 1, 2018

Author(s): Takaaki Koyanagi, Yutai Katoh, Michael J. Lance

Journal: Journal of Raman Spectroscopy

Abstract The effects of neutron irradiation on microstructural evolution and the resultant changes in physical and mechanical properties are of critical importance for the development of silicon carbide (SiC) materials for nuclear applications. This study neutron‐irradiated β‐SiC under a wide range of conditions at temperatures between 235 and 750°C and neutron doses of 0.01–11.8 displacements per atom, and then evaluated the...

Read More thumbnail image: Raman spectroscopy of neutron irradiated silicon carbide C orrelation among R aman spectra swelling and irradiation temperature

The analytical challenges of cyclopropylfentanyl and crotonylfentanyl: An approach for toxicological analysis

Published: Jun 29, 2018

Author(s): Shane Maher, Simon P. Elliott, Steve George

Journal: Drug Testing and Analysis

Abstract New psychoactive substances (NPS) are increasingly being seen in forensic casework globally and encompass a number of types of drugs including “designer opioids”, especially fentanyl analogues, which are of particular concern due to their high potency and significant risk of toxicity. They are often sold as heroin or mixed with other illicit drugs and therefore users may be unaware they are taking such hazardous compounds....

Read More thumbnail image: The analytical challenges of cyclopropylfentanyl and crotonylfentanyl An approach for toxicological analysis

Analysis of cis and trans 3‐methylfentanyl by liquid chromatography–high resolution mass spectrometry and findings in forensic toxicology casework

Published: Jun 29, 2018

Author(s): Melissa F. Fogarty, Donna M. Papsun, Barry K. Logan

Journal: Drug Testing and Analysis

Abstract 3‐methylfentanyl (3‐MF), N‐(3‐methyl‐1‐phenethyl‐4‐piperidyl)‐N‐phenyl‐propanamide, has reappeared on the US illicit drug market since its disappearance after a series of overdose deaths in 1988. 3‐MF presents an analytical challenge, due to presence of cis and trans stereoisomers, each with different potencies, and ultimately very low concentrations in the blood after use. A method was developed using liquid...

Read More thumbnail image: Analysis of cis and trans 3methylfentanyl by liquid chromatographyhigh resolution mass spectrometry and findings in forensic toxicology casework

Screening of drugs and homeopathic products from Atropa belladonna seed extracts: Tropane alkaloids determination and untargeted analysis

Published: Jun 29, 2018

Author(s): Jesús Marín‐Sáez, Roberto Romero‐González, Antonia Garrido Frenich, Francisco Javier Egea‐González

Journal: Drug Testing and Analysis

Abstract Homeopathic products are still a controversial issue in modern medicine, understood as complementary or alternative medicine (CAM). In this particular case, homeopathic products prepared from Atropa belladonna extracts may present specific problems due to the effects derived from its components. This article applies a simple, rapid, reliable method to the analysis of different homeopathic products obtained from Atropa belladonna; drugs...

Read More thumbnail image: Screening of drugs and homeopathic products from Atropa belladonna seed extracts Tropane alkaloids determination and untargeted analysis

Forensic ancestry analysis in two Chinese minority populations using massively parallel sequencing of 165 ancestry‐informative SNPs

Published: Jun 29, 2018

Author(s): Guanglin He, Zheng Wang, Mengge Wang, Tao Luo, Jing Liu, You Zhou, Bo Gao, Yiping Hou

Journal: ELECTROPHORESIS

Abstract Ancestry inference based on SNPs with marked allele frequency differences in diverse populations (called ancestry‐informative SNP (AISNP)) is rapidly developed with the technology advancements of massively parallel sequencing. Despite the decade of exploration and broad public interest in the peopling of East‐Asians, the genetic landscape of Chinese Silk Road populations based on the AISNPs is still little known. In this...

Read More thumbnail image: Forensic ancestry analysis in two Chinese minority populations using massively parallel sequencing of 165 ancestryinformative SNPs

Raman vibrational spectral characteristics and quantitative analysis of H 2 up to 400°C and 40 MPa

Published: Jun 29, 2018

Author(s): Lianfu Li, Xin Zhang, Zhendong Luan, Zengfeng Du, Shichuan Xi, Bing Wang, Lei Cao, Chao Lian, Jun Yan

Journal: Journal of Raman Spectroscopy

Abstract In situ Raman detection is an ideal method to determine the concentration of dissolved H2 in deep‐sea high temperature hydrothermal fluids, but studies on in situ Raman qualitative and quantitative analyses of H2 that are suitable for detection in high temperature hydrothermal fluids are lacking. In this study, the Raman characteristics of gaseous and dissolved H2 were researched at 0–400°C and 0–40 MPa in detail, which cover most deep‐sea...

Read More thumbnail image: Raman vibrational spectral characteristics and quantitative analysis of H 2 up to 400C and 40MPa

Discovering cellular protein‐protein interactions: Technological strategies and opportunities

Published: Jun 29, 2018

Author(s): Kevin Titeca, Irma Lemmens, Jan Tavernier, Sven Eyckerman

Journal: Mass Spectrometry Reviews

The analysis of protein interaction networks is one of the key challenges in the study of biology. It connects genotypes to phenotypes, and disruption often leads to diseases. Hence, many technologies have been developed to study protein‐protein interactions (PPIs) in a cellular context. The expansion of the PPI technology toolbox however complicates the selection of optimal approaches for diverse biological...

Read More thumbnail image: Discovering cellular proteinprotein interactions Technological strategies and opportunities

Quality prediction via semisupervised Bayesian regression with application to propylene polymerization

Published: Jun 28, 2018

Author(s): Yuanmeng Sun, Xinggao Liu, Zeyin Zhang

Journal: Journal of Chemometrics

Abstract Statistical learning techniques are widely used for quality prediction in polymerization processes during the last decades. However, compared to operation variables, quality variables of polypropylene process are usually difficult to acquire resulting from the absence of measuring units. A semisupervised Bayesian regression method is therefore presented to improve the prediction accuracy by sufficient usage of unlabeled...

Read More thumbnail image: Quality prediction via semisupervised Bayesian regression with application to propylene polymerization

Developing a ridge estimator for the gamma regression model

Published: Jun 28, 2018

Author(s): Zakariya Yahya Algamal

Journal: Journal of Chemometrics

Abstract The ridge regression model has been consistently demonstrated to be an attractive shrinkage method to reduce the effects of multicollinearity. The gamma regression model is a very popular model in the application when the response variable is positively skewed. However, it is known that multicollinearity negatively affects the variance of maximum likelihood estimator of the gamma regression coefficients. To address this...

Read More thumbnail image: Developing a ridge estimator for the gamma regression model

Raman microscopy as a tool to discriminate mineral phases of volcanic origin and contaminations on red and yellow ochre raw pigments from P ompeii

Published: Jun 27, 2018

Author(s): Iker Marcaida, Maite Maguregui, Héctor Morillas, Marco Veneranda, Nagore Prieto‐Taboada, Silvia Fdez‐Ortiz de Vallejuelo, Juan Manuel Madariaga

Journal: Journal of Raman Spectroscopy

Abstract Raman microscopy is a molecular technique that is able to detect compounds that are present in the samples at minor/trace levels thanks to the precise focusing on particles of interest. The detection will also depend on the Raman scattering of the measured compound. Moreover, due to the nondestructive character of the measurements, this technique is one of the most used when samples under study belong to the arts and...

Read More thumbnail image: Raman microscopy as a tool to discriminate mineral phases of volcanic origin and contaminations on red and yellow ochre raw pigments from P ompeii

Direct quantitation of endogenous steroid sulfates in human urine by liquid chromatography‐electrospray tandem mass spectrometry

Published: Jun 26, 2018

Author(s): Argitxu Esquivel, Élida Alechaga, Núria Monfort, Rosa Ventura

Journal: Drug Testing and Analysis

Abstract A method based on liquid chromatography–tandem mass spectrometry (LC–MS/MS) for the direct quantitation of endogenous steroid sulfates has been developed to be able to evaluate these metabolites as biomarkers to detect the misuse of endogenous androgenic anabolic steroids in sports. For sample preparation, a mixed‐mode solid‐phase extraction was optimized to eliminate the glucuronide fraction in the washing step thus...

Read More thumbnail image: Direct quantitation of endogenous steroid sulfates in human urine by liquid chromatographyelectrospray tandem mass spectrometry

Phonon properties of ZnSnSb2  +  Mn semiconductors: Raman spectroscopy

Published: Jun 26, 2018

Author(s): Maja Romcevic, Martina Gilic, Lukasz Kilanski, Witold Dobrowolski, Irina Valentinovna Fedorchenko, Sergey Fedorovich Marenkin, Nebojsa Romcevic

Journal: Journal of Raman Spectroscopy

Abstract Doping of II–IV–V2 semiconductors opens up new opportunities for wide application. Addition of Mn to these materials induces formation of magnetic clusters, which are responsible for high‐temperature ferromagnetism. Our aim was to examine how the addition of Mn influences the optical and structural properties of ZnSnSb2 by micro‐Raman spectroscopy. For four samples of Zn1 − xMnxSnSb2 synthesized using the direct fusion...

Read More thumbnail image: Phonon properties of ZnSnSb2  Mn semiconductors Raman spectroscopy
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