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Feedback‐amplified electrochemical dual‐plate boron‐doped diamond microtrench detector for flow injection analysis

Published: Apr 17, 2015

Author(s): Grace E. M. Lewis, Andrew J. Gross, Barbara Kasprzyk‐Hordern, Anneke T. Lubben, Frank Marken

Journal: ELECTROPHORESIS

An electrochemical flow cell with a boron‐doped diamond dual‐plate microtrench electrode has been developed and demonstrated for hydroquinone flow injection electroanalysis in phosphate buffer pH 7. Using the electrochemical generator‐collector feedback detector improves the sensitivity by one order of magnitude (when compared to a single working electrode detector). The diffusion process is switched from an analyte consuming “external”...

Read More thumbnail image: Feedbackamplified electrochemical dualplate borondoped diamond microtrench detector for flow injection analysis

Final report on VAMAS round‐robin study to evaluate a correction method for saturation effects in DSIMS

Published: Apr 17, 2015

Author(s): Akio Takano, Hidehiko Nonaka, Yoshikazu Homma, Mitsuhiro Tomita, Atsushi Murase, Syunichi Hayashi, Mario Barozzi, Kyung Joon Kim, David Sykes, David Simons, Joe Bennett, Charles W. Magee

Journal: Surface and Interface Analysis

A Versailles Project on Advanced Materials and Standards round robin test (RRT) has been conducted to evaluate the linearity of the instrumental intensity scale and correction method using an approximation intermediate extended dead time model with parameters derived from two different isotope depth profiles. Nine organizations in five countries participated. An arsenic‐implanted silicon wafer and a film of BN diffused into a Si wafer...

Read More thumbnail image: Final report on VAMAS roundrobin study to evaluate a correction method for saturation effects in DSIMS

Local surface charge dissipation studied using force spectroscopy method of atomic force microscopy

Published: Apr 17, 2015

Author(s): Reynier I. Revilla, Yan–Lian Yang, Chen Wang

Journal: Surface and Interface Analysis

We propose herein a method to study local surface charge dissipation in dielectric films using force spectroscopy technique of atomic force microscopy. By using a normalization procedure and considering an analytical expression of the tip‐sample interaction force, we could estimate the characteristic time decay of the dissipation process. This approach is completely independent of the atomic force microscopy tip geometry and considerably...

Read More thumbnail image: Local surface charge dissipation studied using force spectroscopy method of atomic force microscopy

XPS and factor analysis study of initial stages of cerium oxide growth on polycrystalline tungsten

Published: Apr 17, 2015

Author(s): Yaroslav Polyak, Z. Bastl

Journal: Surface and Interface Analysis

The initial stages of growth of the nanostructured cerium oxide deposited on the polycrystalline tungsten surface by pulsed laser deposition are studied using XPS technique. The population of Ce (III) and Ce (IV) oxidation states in the deposited CeO2−x layers is determined applying factor analysis method. Tungsten atoms react with oxygen from the cerium oxide nanoparticles already at the room temperature, and a layer of tungsten trioxide...

Read More thumbnail image: XPS and factor analysis study of initial stages of cerium oxide growth on polycrystalline tungsten

Tetrazolo[1,5‐a]quinoline‐4‐carbaldehyde and its Schiff base on mild steel as corrosion inhibitor in 1 M HCl solution: electrochemistry, theoretical and SEM surface analysis

Published: Apr 17, 2015

Author(s): Bhupendra M Mistry, Suban K Sahoo, Doo Hwan Kim, Smita Jauhari

Journal: Surface and Interface Analysis

The corrosion inhibition impact of two quinoline derivatives, viz tetrazolo [1,5‐a] quinoline‐4‐carbaldehyde (TQC) and (Z) −5‐methyl‐N‐(tetrazolo [1,5‐a] quinolin‐4‐ylmethylene) thiazol‐2‐amine (MTQT), has been examined against mild steel in 1 M HCl solution using conventional weight loss, potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy, quantum chemical, and scanning electron microscopic studies. The...

Read More thumbnail image: Tetrazolo15aquinoline4carbaldehyde and its Schiff base on mild steel as corrosion inhibitor in 1M HCl solution electrochemistry theoretical and SEM surface analysis

AuN films – structure and chemical binding

Published: Apr 17, 2015

Author(s): J. H. Quintero, P. J. Arango, R. Ospina, A. Mello, A. Mariño

Journal: Surface and Interface Analysis

Abstract AuN films were produced on 304 stainless steel using an arc‐pulsed – assisted plasma physical vapor deposition system. The deposition was performed using an Au target in a nitrogen atmosphere at different pressures. The films were characterized using x‐ray photoelectron spectroscopy and x‐ray diffraction. A 398.1‐eV binding energy was observed and assigned to gold nitride species. The x‐ray diffraction patterns displayed a...

Read More thumbnail image: AuN films  structure and chemical binding

X‐ray‐induced degradation of OEG‐terminated SAMs on silica surfaces during XPS characterization

Published: Apr 17, 2015

Author(s): Francisco Palazon, Thomas Géhin, Djawhar Ferrah, Anaïs Garnier, Claude Botella, Geneviève Grenet, Éliane Souteyrand, Jean‐Pierre Cloarec, Yann Chevolot

Journal: Surface and Interface Analysis

Oligo ethylene glycol layers are widely used in biosensor applications, mainly for their anti‐fouling abilities. Such surfaces are often characterized by X‐ray photoelectron spectroscopy (XPS) as this method allows a precise determination of the surface chemical composition. We show herein that X‐rays used during XPS characterization quickly and significantly degrade oligo ethylene glycol immobilized onto silica substrates. It is therefore necessary...

Read More thumbnail image: Xrayinduced degradation of OEGterminated SAMs on silica surfaces during XPS characterization

Assessing the detectability of antioxidants in two‐dimensional high‐performance liquid chromatography

Published: Apr 17, 2015

Author(s): Danielle N. Bassanese, Xavier A. Conlan, Neil W. Barnett, Paul G. Stevenson

Journal: Journal of Separation Science

This paper explores the analytical figures of merit of two‐dimensional high‐performance liquid chromatography for the separation of antioxidant standards. The cumulative two‐dimensional high‐performance liquid chromatography peak area was calculated for 11 antioxidants by two different methods—the areas reported by the control software and by fitting the data with a Gaussian model; these methods were evaluated for precision and...

Read More thumbnail image: Assessing the detectability of antioxidants in twodimensional highperformance liquid chromatography

Tracing novel hemostatic compounds from heating products of total flavonoids in Flos Sophorae by spectrum–effect relationships and column chromatography

Published: Apr 17, 2015

Author(s): Yeqing Chen, Hongli Yu, Hao Wu, Yaozong Pan, Kuilong Wang, Liping Liu, Yangping Jin, Chenchao Zhang

Journal: Journal of Separation Science

Flos Sophorae and its processed product have been clinically used to treat hemorrhage. In this study, the total ion chromatographic fingerprints of the heating products of total flavonoids in Flos Sophorae were established by high‐performance liquid chromatography with tandem mass spectrometry and the hemostatic activities were studied by hemostatic screening tests in vivo. The spectrum–effect relationships between fingerprints...

Read More thumbnail image: Tracing novel hemostatic compounds from heating products of total flavonoids in Flos Sophorae by spectrumeffect relationships and column chromatography

Determination of phthalate esters in Chinese spirits using isotope dilution gas chromatography with tandem mass spectrometry

Published: Apr 17, 2015

Author(s): Jing Wang, Xiaomin Li, Qinghe Zhang, Jinping Xiong, Hongmei Li

Journal: Journal of Separation Science

Phthalate esters are additives used in polyvinylchloride and are found as contaminants in many food products. An isotope dilution mass spectrometry technique has been developed for accurate analysis of 16 phthalate esters in Chinese spirits by adopting the 16 corresponding isotope‐labeled phthalate esters. The ethanol in the spirit sample was first removed by heating with a water bath at 100°C with a stream of nitrogen, after which the...

Read More thumbnail image: Determination of phthalate esters in Chinese spirits using isotope dilution gas chromatography with tandem mass spectrometry

Soft‐ and reactive landing of ions onto surfaces: Concepts and applications

Published: Apr 16, 2015

Author(s): Grant E. Johnson, Don Gunaratne, Julia Laskin

Journal: Mass Spectrometry Reviews

Soft‐ and reactive landing of mass‐selected ions is gaining attention as a promising approach for the precisely‐controlled preparation of materials on surfaces that are not amenable to deposition using conventional methods. A broad range of ionization sources and mass filters are available that make ion soft‐landing a versatile tool for surface modification using beams of hyperthermal (<100 eV) ions. The ability...

Read More thumbnail image: Soft and reactive landing of ions onto surfaces Concepts and applications

Mass spectrometric based approaches in urine metabolomics and biomarker discovery

Published: Apr 16, 2015

Author(s): Mona M. Khamis, Darryl J. Adamko, Anas El‐Aneed

Journal: Mass Spectrometry Reviews

Urine metabolomics has recently emerged as a prominent field for the discovery of non‐invasive biomarkers that can detect subtle metabolic discrepancies in response to a specific disease or therapeutic intervention. Urine, compared to other biofluids, is characterized by its ease of collection, richness in metabolites and its ability to reflect imbalances of all biochemical pathways within the body. Following urine...

Read More thumbnail image: Mass spectrometric based approaches in urine metabolomics and biomarker discovery

13 C MRS reveals a small diurnal variation in the glycogen content of human thigh muscle

Published: Apr 16, 2015

Author(s): Hideyuki Takahashi, Akiko Kamei, Takuya Osawa, Takashi Kawahara, Osamu Takizawa, Katsuya Maruyama

Journal: NMR in Biomedicine

There is marked diurnal variation in the glycogen content of skeletal muscles of animals, but few studies have addressed such variations in human muscles. 13C MRS can be used to noninvasively measure the glycogen content of human skeletal muscle, but no study has explored the diurnal variations in this parameter. This study aimed to investigate whether a diurnal variation in glycogen content occurs in human muscles and, if so, to what...

Read More thumbnail image: 13 C MRS reveals a small diurnal variation in the glycogen content of human thigh muscle

Assessment of vessel permeability by combining dynamic contrast‐enhanced and arterial spin labeling MRI

Published: Apr 16, 2015

Author(s): Ho‐Ling Liu, Ting‐Ting Chang, Feng‐Xian Yan, Cheng‐He Li, Yu‐Shi Lin, Alex M. Wong

Journal: NMR in Biomedicine

The forward volumetric transfer constant (Ktrans), a physiological parameter extracted from dynamic contrast‐enhanced (DCE) MRI, is weighted by vessel permeability and tissue blood flow. The permeability × surface area product per unit mass of tissue (PS) in brain tumors was estimated in this study by combining the blood flow obtained through pseudo‐continuous arterial spin labeling (PCASL) and Ktrans obtained through DCE MRI. An analytical analysis...

Read More thumbnail image: Assessment of vessel permeability by combining dynamic contrastenhanced and arterial spin labeling MRI

Raman and infrared spectroscopic characterization of the arsenate‐bearing mineral tangdanite– and in comparison with the discredited mineral clinotyrolite

Published: Apr 15, 2015

Author(s): Ray L. Frost, Ricardo Scholz, Andrés López

Journal: Journal of Raman Spectroscopy

The minerals clinotyrolite and fuxiaotuite are discredited in terms of the mineral tangdanite. The mixed anion mineral tangdanite Ca2Cu9(AsO4)4(SO4)0.5(OH)9 9H2O has been studied using a combination of Raman and infrared spectroscopy. Characteristic bands associated with arsenate, sulphate and hydroxyl units are identified. Broad bands in the OH stretching region are observed and are resolved into component bands. These bands are assigned...

Read More thumbnail image: Raman and infrared spectroscopic characterization of the arsenatebearing mineral tangdanite and in comparison with the discredited mineral clinotyrolite

PAT: From Western solid dosage forms to Chinese materia medica preparations using NIR‐CI

Published: Apr 15, 2015

Author(s): Luwei Zhou, Manfei Xu, Zhisheng Wu, Xinyuan Shi, Yanjiang Qiao

Journal: Drug Testing and Analysis

Near‐infrared chemical imaging (NIR‐CI) is an emerging technology that combines traditional near‐infrared spectroscopy with chemical imaging. Therefore, NIR‐CI can extract spectral information from pharmaceutical products and simultaneously visualize the spatial distribution of chemical components. The rapid and non‐destructive features of NIR‐CI make it an attractive process analytical technology (PAT) for identifying and monitoring...

Read More thumbnail image: PAT From Western solid dosage forms to Chinese materia medica preparations using NIRCI

Combination of IgG N ‐glycomics and corresponding transcriptomics data to identify anti‐TNF‐α treatment responders in inflammatory diseases

Published: Apr 15, 2015

Author(s): Csaba Váradi, Zsolt Holló, Szilárd Póliska, László Nagy, Zoltán Szekanecz, Andrea Váncsa, Károly Palatka, András Guttman

Journal: ELECTROPHORESIS

Prediction of responsiveness in biological therapies is an important and challenging issue in different diseases. Analyzing glycosylation pattern changes of key serum glycoproteins is one of the possible avenues to follow disease remission. The aim of this study was to investigate the changes of serum IgG glycoforms in Crohn's disease (CD) and rheumatoid arthritis patients in response to antitumor necrosis factor alpha (anti‐TNF‐α)...

Read More thumbnail image: Combination of IgG N glycomics and corresponding transcriptomics data to identify antiTNF treatment responders in inflammatory diseases

Ultra‐performance liquid chromatography of amino acids for the quality assessment of pearl powder

Published: Apr 15, 2015

Author(s): Jingxian Zhang, Shangrong Li, Shuai Yao, Wei Si, Luying Cai, Huiqin Pan, Jinjun Hou, Wenzhi Yang, Juan Da, Baohong Jiang, Xuan Liu, Wanying Wu, De‐an Guo

Journal: Journal of Separation Science

Pearls have been widely used as a traditional medicine, in cosmetics, and as a health food supplement in China since ancient times. However, the identification and quality assessment of pearl powder have been challenging tasks because of the similar morphological features and chemical composition of its common adulterants, especially conch powders. In this study, ultra‐performance liquid chromatography was combined with pre‐column...

Read More thumbnail image: Ultraperformance liquid chromatography of amino acids for the quality assessment of pearl powder

Test purchase, synthesis, and characterization of 2‐methoxydiphenidine (MXP) and differentiation from its meta ‐ and para ‐substituted isomers

Published: Apr 15, 2015

Author(s): Gavin McLaughlin, Noreen Morris, Pierce V. Kavanagh, John D. Power, John O'Brien, Brian Talbot, Simon P. Elliott, Jason Wallach, Khoa Hoang, Hamilton Morris, Simon D. Brandt

Journal: Drug Testing and Analysis

The structurally diverse nature of the 1,2‐diphenylethylamine template provides access to a range of substances for drug discovery work but some have attracted attention as ‘research chemicals’. The most recent examples include diphenidine, i.e. 1‐(1,2‐diphenylethyl)piperidine and 2‐methoxydiphenidine, i.e. 1‐[1‐(2‐methoxyphenyl)‐2‐phenylethyl]piperidine (MXP, methoxyphenidine, 2‐MXP) that have been associated with uncompetitive...

Read More thumbnail image: Test purchase synthesis and characterization of 2methoxydiphenidine MXP and differentiation from its meta  and para substituted isomers

Micro‐Raman mapping of the polymorphs of serpentine

Published: Apr 14, 2015

Author(s): J. R. Petriglieri, E. Salvioli‐Mariani, L. Mantovani, M. Tribaudino, P. P. Lottici, C. Laporte‐Magoni, D. Bersani

Journal: Journal of Raman Spectroscopy

Serpentinites are rocks, often used in buildings, formed in large extent by minerals of the serpentine group: chrysotile, antigorite, lizardite, and polygonal serpentine. The fibrous type (e.g. chrysotile) of serpentine group minerals, along with several amphibole varieties (e.g. actinolite and tremolite), are the major components of asbestos family. The exposure to fine fibrous asbestos powder is linked to diseases such as pleural...

Read More thumbnail image: MicroRaman mapping of the polymorphs of serpentine
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