EarlyView Articles
The very latest articles from the scientific literature
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Rapid and noninvasive quality control of anhydrous milk fat by PTR‐MS: The effect of storage time and packaging
Published: Jun 22, 2018
Author(s): M. Pedrotti, I. Khomenko, L. Cappellin, M. Fontana, M. Somenzi, L. Falchero, M. Arveda, V. Fogliano, F. Biasioli
Journal: Journal of Mass Spectrometry
Abstract In this study, proton transfer reaction‐mass spectrometry (PTR‐MS), coupled with a time‐of‐flight mass analyzer and a multipurpose automatic sampler, was evaluated as a rapid and nondestructive tool for the quality control of anhydrous milk fat. Anhydrous milk fats packed in cardboard and bag‐in‐box were compared during refrigerated shelf life at 4°C for 9 months. Anhydrous milk fat samples were taken at 120, 180, and...
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Thiol‐ene click derived structurally well‐defined per(3,5‐dimethyl)phenylcarbamoylated cationic cyclodextrin separation material for achiral and chiral chromatography
Published: Jun 22, 2018
Author(s): Xiaoying Tang, Xiaoxuan Li, Yuwei Sun, Yin Xiao, Yong Wang
Journal: Journal of Separation Science
Abstract In this work, a novel single sulfoether‐bridged cationic per(3,5‐dimethyl)phenylcarbamoylated‐β‐cyclodextrin separation material was prepared by thiol‐ene click chemistry and characterized by using FTIR spectroscopy, solid‐state 13C NMR spectroscopy and elemental analysis, which confirmed the correct structure. The separation material exhibited a good achiral separation performance for benzene homologues and phenylamine analogs,...
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Simultaneous derivatization and lighter‐than‐water air‐assisted liquid–liquid microextraction using a homemade device for the extraction and preconcentration of some parabens in different samples
Published: Jun 22, 2018
Author(s): Mir Ali Farajzadeh, Mehri Bakhshizadeh Aghdam, Mohammad Reza Afshar Mogaddam, Ali Akbar Alizadeh Nabil
Journal: Journal of Separation Science
Abstract Simultaneous derivatization and air‐assisted liquid–liquid microextraction using an organic that is solvent lighter than water has been developed for the extraction of some parabens in different samples with the aid of a newly designed device for collecting the extractant. For this purpose, the sample solution is transferred into a glass test tube and a few microliters of acetic anhydride (as a derivatization agent) and...
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CO 2 induced pH i changes in the brain of polar fish: a TauCEST application
Published: Jun 22, 2018
Author(s): Felizitas C. Wermter, Bastian Maus, Hans‐O. Pörtner, Wolfgang Dreher, Christian Bock
Journal: NMR in Biomedicine
Chemical exchange saturation transfer (CEST) from taurine to water (TauCEST) can be used for in vivo mapping of taurine concentrations as well as for measurements of relative changes in intracellular pH (pHi) at temperatures below 37°C. Therefore, TauCEST offers the opportunity to investigate acid–base regulation and neurological disturbances of ectothermic animals living at low temperatures, and in particular to study the impact of ocean acidification ...
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XPS study of the SnO 2 films modified with Rh
Published: Jun 22, 2018
Author(s): G. Korotcenkov, V. Brinzari, P. Hanyš, V. Nehasil
Journal: Surface and Interface Analysis
In this paper, we have analyzed the effect of the rhodium surface modification on the surface state of SnO2 films. SnO2 films, subjected for the surface modification, were deposited by spray pyrolysis, while Rh was deposited by using a microelectron beam evaporation. The thickness of the Rh coating varied in the range 0 to 0.1 monolayer. An explanation of the observed effects was proposed. Basing on the results of X‐ray photoelectron spectroscopy, it...
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Temperature‐dependent local atomic structures in the traditional Fe 65 Ni 35 Invar alloy by X‐ray fluorescence holography
Published: Jun 22, 2018
Author(s): Jens Rüdiger Stellhorn, Yuuki Ideguchi, Shinya Hosokawa, Naohisa Happo, Tomohiro Matsushita, Kunio Yubuta, Motohiro Suzuki, Hirofumi Ishii, Yen‐Fa Liao, Koji Kimura, Kouichi Hayashi
Journal: Surface and Interface Analysis
Fe and Ni Kα X‐ray fluorescence holography measurements were conducted on a single crystal Fe65Ni35 Invar alloy at 100 and 300 K to investigate the temperature dependence of the 3‐dimensional local structures around the Fe and Ni atoms, respectively. Local structural information was obtained by detailed analyses using a L1‐regularized linear regression for the experimental data. At 100 K, the local atomic arrangements around both the elements show...
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Superhydrophilic/superhydrophobic surfaces fabricated by spark‐coating
Published: Jun 22, 2018
Author(s): T. Kumpika, E. Kantarak, W. Sroila, A. Panthawan, N. Jhuntama, P. Sanmuangmoon, W. Thongsuwan, P. Singjai
Journal: Surface and Interface Analysis
In this study, the authors researched the preparations of superhydrophilic/superhydrophobic surfaces on commercial cup stock polyethylene coated papers by using sparked aluminum nanoparticles deposited on substrates through a sparking process. In this stage, the surface was porous and showed superhydrophilic properties. The samples were then annealed in air at various temperatures and some transformed to superhydrophobicity. It is well...
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Summary of ISO/TC 201 Technical Report: ISO/TR 19693 Surface chemical analysis—Characterization of functional glass substrates for biosensing applications
Published: Jun 22, 2018
Author(s): P. M. Dietrich, W. E. S. Unger
Journal: Surface and Interface Analysis
ISO/TR 19693:2018—Surface chemical analysis—Characterization of functional glass substrates for biosensing applications gives an overview of methods, strategies, and guidance to identify possible sources of problems related to substrates, device production steps (cleaning, activation, and chemical modification), and shelf life (storage conditions and aging). It is particularly relevant for surface chemical analysts characterizing glass‐based...
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The oscillatory adsorption of self‐assembled organosilane films on aluminium oxide surfaces
Published: Jun 22, 2018
Author(s): R. A. Sims, S. L. Harmer‐Bassell, J. S. Quinton
Journal: Surface and Interface Analysis
The time‐dependent oscillatory growth mechanism of organosilane film self‐assembly on aluminium oxide has been investigated using X‐ray photoelectron spectroscopy. While this unusual oscillatory process has been reported for the trifunctional silane, propyltrimethoxysilane, we report here, for the first time, that this oscillatory behaviour is also present during the self‐assembly of the difunctional silane propylmethyldimethoxysilane....
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The improvement in interfacial shear strength of wood fiber/epoxy composite by sizing with epoxy sizing agent containing MWCNTs
Published: Jun 22, 2018
Author(s): Runqin He, Qiuxiang Chang, Chunzheng Peng
Journal: Surface and Interface Analysis
This paper discloses a feasible and high efficient strategy for wood fiber treatment to introducing multi‐wall carbon nanotubes (MWCNTs) to the surface of wood fibers for the aim of improving the interfacial shear strength of wood fiber/epoxy composite. Briefly, a layer of MWCNT was deposited on wood fibers through sizing wood fibers with epoxy sizing agent containing amine‐treated MWCNTs (MWCNT‐PEI). The surface functional groups,...
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Hydrazide functionalized magnetic nanoparticles for specific extraction of N‐ terminal serine and threonine peptides
Published: Jun 21, 2018
Author(s): Mohammad Saraji, Shila Yousefi
Journal: Biomedical Chromatography
Abstract In this study, we present hydrazide functionalized magnetic nanoparticles as a sorbent prepared by a new and facile method. Scanning electron microscope and Fourier transform infrared were used for characterizing the synthesized nanoparticles. The ability of the sorbent to extract N‐terminal serine and threonine peptides was evaluated. The peptides were modified by oxidation of the hydroxyl group in the 1,2‐amino alcohol...
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Development and validation of a UPLC–MS/MS method for determination of Sarsasapogenin‐AA22 in rat plasma and its application to a pharmacokinetic study
Published: Jun 21, 2018
Author(s): Lixia Pei, Songlan Ge, Yiyi Ye, Ziwei Jiang, Xiaoqiang Liang, Wenshu Zhao, Lei Ma
Journal: Biomedical Chromatography
Abstract A sarsasapogenin derivative, sarsasapogenin‐AA22 (AA22), with cyclobutylamine at the 3‐hydroxyl position of sarsasapogenin, has great neuroprotective activity in PC12 cells and NO production inhibitory activity in RAW264.7 cell lines. A method was developed to determine AA22 in rat plasma which was further applied to evaluate the pharmacokinetics of AA22 after taking a single dose of AA22. Liquid chromatography tandem mass...
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L‐ and D‐threo ethylphenidate concentrations, pharmacokinetics, and pharmacodynamics in horses
Published: Jun 21, 2018
Author(s): Heather K. Knych, Dan S. McKemie, Kelsey Seminoff, Petra Hartmann, Lynn Hovda, Dionne Benson
Journal: Drug Testing and Analysis
Abstract Ethylphenidate is a psychostimulant and analog of the commonly prescribed compound, methylphenidate (Ritalin®). There are a limited number of studies describing the disposition and pharmacologic/toxicological effects of ethylphenidate in any species. The abuse potential in equine athletes along with the limited data available regarding administration in horses necessitates further study. The objectives of the current study...
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Monitoring dehydroepiandrosterone (DHEA) in the urine of Thoroughbred geldings for doping control purposes
Published: Jun 21, 2018
Author(s): Marjaana Viljanto, Pamela Hincks, Lynn Hillyer, Adam Cawley, Craig Suann, Glenys Noble, Christopher J. Walker, Mark C. Parkin, Andrew T. Kicman, James Scarth
Journal: Drug Testing and Analysis
Abstract The use of testosterone and its pro‐drugs, such as dehydroepiandrosterone (DHEA), is currently regulated in horseracing by the application of international testosterone thresholds. However, additional steroidomic approaches, such as steroid ratios, to distinguish overall adrenal stimulation from drug administrations and an equine biological passport for longitudinal steroid profiling of individual animals could be...
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Developing a robust LC–MS/MS method to quantify Zn‐DTPA, a zinc chelate in human plasma and urine
Published: Jun 21, 2018
Author(s): Lin Yu, Fanhua Meng, Miao Guo, Ying Yang, Jianchang He, Junxing Dong, Jifen Guo, Shuangqing Peng
Journal: Biomedical Chromatography
Abstract Quantitation of Zn‐DTPA (zinc diethylenetriamene pentaacetate, a metal chelate) in complex biological matrix is extremely challenging on account of its special physiochemical properties. This study aimed to develop a robust and specific liquid chromatography–tandem mass spectrometry (LC–MS/MS) method for determination of Zn‐DTPA in human plasma and urine. The purified samples were separated on Proteonavi (250 × 4.6 mm,...
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Development, validation and comparison of surrogate matrix and surrogate analyte approaches with UHPLC–MS/MS to simultaneously quantify dopamine, serotonin and γ ‐aminobutyric acid in four rat brain regions
Published: Jun 21, 2018
Author(s): Rong‐xia Liu, You‐yan Xian, Sha Liu, Fei Yu, Hong‐jie Mu, Kao‐xiang Sun, Wan‐hui Liu
Journal: Biomedical Chromatography
Abstract As biomarkers, endogenous neurotransmitters play critical roles in the process of neuropsychiatric diseases, and neurotransmitter levels in different brain regions can contribute to neurological disease diagnosis and treatment. Due to the lack of a blank matrix for endogenous neurotransmitters, surrogate‐matrix and surrogate‐analyte approaches have been used for the determination of neurotransmitters to solve this problem....
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Molecular causes of elevated phosphoethanolamine in breast and pancreatic cancer cells
Published: Jun 21, 2018
Author(s): Tariq Shah, Balaji Krishnamachary, Flonne Wildes, Jannie P. Wijnen, Kristine Glunde, Zaver M. Bhujwalla
Journal: NMR in Biomedicine
Elevated phosphoethanolamine (PE) is frequently observed in MRS studies of human cancers and xenografts. The role of PE in cell survival and the molecular causes underlying this increase are, however, relatively underexplored. In this study, we investigated the roles of ethanolamine kinases (Etnk‐1 and 2) and choline kinases (Chk‐α and β) in contributing to increased PE in human breast and pancreatic cancer cells. We investigated the...
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Size‐adaptable 13‐channel receive array for brain MRI in human neonates at 3 T
Published: Jun 21, 2018
Author(s): Nibardo Lopez Rios, Alexandru Foias, Gregory Lodygensky, Mathieu Dehaes, Julien Cohen‐Adad
Journal: NMR in Biomedicine
Neonatal brain injury suffered by preterm infants and newborns with some medical conditions can cause significant neurodevelopmental disabilities. MRI is a preferred method to detect these accidents and perform in vivo evaluation of the brain. However, the commercial availability and optimality of receive coils for the neonatal brain is limited, which in many cases leads to images lacking in quality. As extensively demonstrated, receive arrays...
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Handheld surface‐enhanced Raman scattering identification of dye chemical composition in felt‐tip pen drawings
Published: Jun 21, 2018
Author(s): Daniela Saviello, Alexandra Di Gioia, Pierre‐Ives Turenne, Maddalena Trabace, Rodorico Giorgi, Antonio Mirabile, Piero Baglioni, Daniela Iacopino
Journal: Journal of Raman Spectroscopy
Abstract A handheld Raman spectrometer is used for the first time to perform surface‐enhanced Raman scattering (SERS) analysis of felt‐tip pen drawings on paper. The use of SERS combined with near‐infrared excitation wavelength allows overcoming the strong fluorescence background interference so that diagnostic spectra are obtained from drawings made by 18 pens of 10 different colors and five different brands. The analysis reveals...
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Spark plasma sintering preparation of reference targets for field spectroscopy on Mars
Published: Jun 21, 2018
Author(s): G. Montagnac, G. Dromart, P. Beck, F. Mercier, B. Reynard, A. Cousin, S. Maurice, R. Wiens
Journal: Journal of Raman Spectroscopy
Abstract We propose spark plasma sintering (SPS) as a technique to prepare reference targets for Raman and other spectroscopy instruments involved in future space missions and more generally in‐field work. We have tested the effect of SPS on different international standards that are available in the form of minerals and rocks powders. Advantages and potential issues of SPS were considered by analyzing the Raman signal and...
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