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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...

Read More thumbnail image: Rapid and noninvasive quality control of anhydrous milk fat by PTRMS The effect of storage time and packaging

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,...

Read More thumbnail image: Thiolene click derived structurally welldefined per35dimethylphenylcarbamoylated cationic cyclodextrin separation material for achiral and chiral chromatography

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...

Read More thumbnail image: Simultaneous derivatization and lighterthanwater airassisted liquidliquid microextraction using a homemade device for the extraction and preconcentration of some parabens in different samples

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 ...

Read More thumbnail image: CO 2 induced pH i changes in the brain of polar fish a TauCEST application

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...

Read More thumbnail image: XPS study of the SnO 2 films modified with Rh

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...

Read More thumbnail image: Temperaturedependent local atomic structures in the traditional Fe 65 Ni 35 Invar alloy by Xray fluorescence holography

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...

Read More thumbnail image: Superhydrophilicsuperhydrophobic surfaces fabricated by sparkcoating

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...

Read More thumbnail image: Summary of ISOTC 201 Technical Report ISOTR 19693 Surface chemical analysisCharacterization of functional glass substrates for biosensing applications

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....

Read More thumbnail image: The oscillatory adsorption of selfassembled organosilane films on aluminium oxide surfaces

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,...

Read More thumbnail image: The improvement in interfacial shear strength of wood fiberepoxy composite by sizing with epoxy sizing agent containing MWCNTs

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...

Read More thumbnail image: Hydrazide functionalized magnetic nanoparticles for specific extraction of N terminal serine and threonine peptides

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...

Read More thumbnail image: Development and validation of a UPLCMSMS method for determination of SarsasapogeninAA22 in rat plasma and its application to a pharmacokinetic study

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...

Read More thumbnail image: L and Dthreo ethylphenidate concentrations pharmacokinetics and pharmacodynamics in horses

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...

Read More thumbnail image: Monitoring dehydroepiandrosterone DHEA in the urine of Thoroughbred geldings for doping control purposes

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,...

Read More thumbnail image: Developing a robust LCMSMS method to quantify ZnDTPA a zinc chelate in human plasma and urine

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....

Read More thumbnail image: Development validation and comparison of surrogate matrix and surrogate analyte approaches with UHPLCMSMS to simultaneously quantify dopamine serotonin and  aminobutyric acid in four rat brain regions

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...

Read More thumbnail image: Molecular causes of elevated phosphoethanolamine in breast and pancreatic cancer cells

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...

Read More thumbnail image: Sizeadaptable 13channel receive array for brain MRI in human neonates at 3T

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...

Read More thumbnail image: Handheld surfaceenhanced Raman scattering identification of dye chemical composition in felttip pen drawings

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...

Read More thumbnail image: Spark plasma sintering preparation of reference targets for field spectroscopy on Mars
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