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Particular H2O dissolution mechanism in iron‐rich melt: Application to martian basaltic melt genesis

Published: Dec 6, 2019

Author(s): Chloé Larre, Yann Morizet, Antoine Bézos, Christèle Guivel, Carole La, Nicolas Mangold

Journal: Journal of Raman Spectroscopy

Abstract Martian basalts are different from Earth by their iron‐rich abundance with 18 wt% FeOtot in average for Mars upper crust. The H2O dissolution mechanism in this atypical melt composition is not well understood. We have synthesized H2O‐bearing martian basaltic glass analogs (10 1500°C) conditions. We used Raman and Fourier transform infrared spectroscopies to investigate the effect of H2O as well as the high FeOtot content on the molecular structure of Fe‐rich glasses. Increasing Fe...

Read More thumbnail image: Particular H2O dissolution mechanism in ironrich melt Application to martian basaltic melt genesis

High‐resolution diffusion MRI studies of development in pregnant mice visualized by novel spatiotemporal encoding schemes

Published: Dec 6, 2019

Author(s): Qingjia Bao, Gilad Liberman, Eddy Solomon, Lucio Frydman

Journal: NMR in Biomedicine

This study introduces an MRI approach to map diffusion of water in vivo with high resolution under challenging conditions; the approach's potential is then used in diffusivity characterizations of embryos and fetoplacental units in pregnant mice, as well as of newborn mice in their initial postnatal period. The method relies on performing self‐referenced spatiotemporal encoded MRI acquisitions, which can achieve the motional and susceptibility immunities needed to target challenging regions...

Read More thumbnail image: Highresolution diffusion MRI studies of development in pregnant mice visualized by novel spatiotemporal encoding schemes

Raman spectroscopy study of graphene formed by “in situ” chemical interaction of an organic precursor with a molten aluminium matrix

Published: Dec 6, 2019

Author(s): L.A. Yolshina, E.G. Vovkotrub, A.A. Shatunova, V.I. Pryakhina

Journal: Journal of Raman Spectroscopy

Abstract A study of graphene “in situ” formed during the chemical interaction of glucose with molten aluminium under a layer of molten alkaline halides in air at temperatures of 750–850°C is presented. By means of Raman and X‐ray photoelectron spectroscopy and electron microscopy, it is shown that graphene films synthesize in the aluminium. The number and defectiveness of graphene layers inside aluminium matrix depends on synthesis temperature– at 750°C two‐layer graphene and at 850°C...

Read More thumbnail image: Raman spectroscopy study of graphene formed by in situ chemical interaction of an organic precursor with a molten aluminium matrix

Nanomaterials in the Environment Acquire an “Eco‐Corona” Impacting their Toxicity to Daphnia Magna—a Call for Updating Toxicity Testing Policies

Published: Dec 6, 2019

Author(s): Fatima Nasser, Julia Constantinou, Iseult Lynch

Journal: PROTEOMICS

Abstract Nanomaterials (NMs) are particles with at least one dimension between 1 and 100 nm and a large surface area to volume ratio, providing them with exceptional qualities that are exploited in a variety of industrial fields. Deposition of NMs into environmental waters during or after use leads to the adsorption of an ecological (eco‐) corona, whereby a layer of natural biomolecules coats the NM changing its stability, identity and ultimately toxicity. The eco‐corona is not currently...

Read More thumbnail image: Nanomaterials in the Environment Acquire an EcoCorona Impacting their Toxicity to Daphnia Magnaa Call for Updating Toxicity Testing Policies

Reliability of Protein Abundance and Synthesis Measurements in Human Skeletal Muscle

Published: Dec 6, 2019

Author(s): Kanchana Srisawat, Katie Hesketh, Matt Cocks, Juliette Strauss, Ben J. Edwards, Paulo J. Lisboa, Sam Shepherd, Jatin G. Burniston

Journal: PROTEOMICS

Abstract The repeatability of dynamic proteome profiling (DPP), which is a novel technique for measuring the relative abundance (ABD) and fractional synthesis rate (FSR) of proteins in humans, is investigated. LC–MS analysis is performed on muscle samples taken from male participants (n = 4) that consumed 4 × 50 mL doses of deuterium oxide (2H2O) per day for 14 days. ABD is measured by label‐free quantitation and FSR is calculated from time‐dependent changes in peptide mass isotopomer...

Read More thumbnail image: Reliability of Protein Abundance and Synthesis Measurements in Human Skeletal Muscle

Aqueous two‐phase systems based on deep eutectic solvents and their application in green separation processes

Published: Dec 6, 2019

Author(s): Rong‐tao Zhao, Dong Pei, Pei‐liang Yu, Jan‐teng Wei, Ning‐li Wang, Duo‐Long Di, Ye‐wei Liu

Journal: Journal of Separation Science

Abstract As a new environmentally friendly separation technology, deep eutectic solvent based aqueous two‐phase systems are extensively applied in various fields. Herein, we review recent advances in this field and highlight the possible directions of future developments. This article focuses on the effects of deep eutectic solvent and inorganic salts on the phase equilibrium, the microstructure of deep eutectic solvent based aqueous two‐phase systems, the applications of deep eutectic solvent...

Read More thumbnail image: Aqueous twophase systems based on deep eutectic solvents and their application in green separation processes

Determination of S‐adenosylmethionine, S‐adenosylhomocysteine, and methylthioadenosine in urine using solvent‐modified micellar electrokinetic chromatography

Published: Dec 6, 2019

Author(s): Alexander Vladimirovich Ivanov, Mariya Petrovna Kruglova, Edward Danielevich Virus, Polina Olegovna Bulgakova, Sergei Vital'evich Grachev, Aslan Amirkhanovich Kubatiev

Journal: ELECTROPHORESIS

Abstract A new approach for direct determination of S‐adenosylmethionine (SAM), S‐adenosylhomocysteine (SAH), and methylthioadenosine (MTA) in urine was developed based on MEKC by using SDS modified with isobutanol in the presence of PEG‐300. Analytes were first extracted with grafted phenylborononic acid. Using a 50 µm internal diameter silica capillary of 32 cm total length filled with 0.05 M SDS, 0.05 M H3PO4, 5% (v/v) isobutanol, and 10% (v/v) PEG‐300, LOQ of 0.15 µM for SAM and SAH, and...

Read More thumbnail image: Determination of Sadenosylmethionine Sadenosylhomocysteine and methylthioadenosine in urine using solventmodified micellar electrokinetic chromatography

Surface characterizations of membranes and electrospun chitosan derivatives by optical speckle analysis

Published: Dec 6, 2019

Author(s): Muhammad Rizwan, Yasaman Ganjkhani, Vahideh Farzam Rad, Maasoomeh Bazzar, Muhammad Yar, Rosiyah Yahya, Ali‐Reza Moradi

Journal: Surface and Interface Analysis

In this paper, we show that laser speckle pattern provides useful information toward revealing discrimination between nanofibers and membranes. Chitosan materials particularly organosoluble chitosan derivatives have a number of applications. The surface characteristics of these materials are very critical for specific applications. The analysis of laser speckles, both numerical and graphical, includes information about the surface structure. The development of digital electronics brought the...

Read More thumbnail image: Surface characterizations of membranes and electrospun chitosan derivatives by optical speckle analysis

MASS SPECTROMETRIC FRAGMENTATION OF TRIMETHYLSILYL AND RELATED ALKYLSILYL DERIVATIVES

Published: Dec 6, 2019

Author(s): David J. Harvey, Paul Vouros

Journal: Mass Spectrometry Reviews

This review describes the mass spectral fragmentation of trimethylsilyl (TMS) and related alkylsilyl derivatives used for preparing samples for analysis, mainly by combined gas chromatography and mass spectrometry (GC/MS). The review is divided into three sections. The first section is concerned with the TMS derivatives themselves and describes fragmentation of derivatized alcohols, thiols, amines, ketones, carboxylic acids and bifunctional compounds such as hydroxy‐ and amino‐acids, halo...

Read More thumbnail image: MASS SPECTROMETRIC FRAGMENTATION OF TRIMETHYLSILYL AND RELATED ALKYLSILYL DERIVATIVES

Tip‐modified Raman tensor of a porphine molecule

Published: Dec 5, 2019

Author(s): Almaz R. Gazizov, Myakzyum Kh. Salakhov, Sergey S. Kharintsev

Journal: Journal of Raman Spectroscopy

Abstract It is well established that bringing a plasmonic tip into the proximity of a single molecule inevitably affects its state and vice versa. Due to the enhanced light–matter interaction, spectroscopic information on the molecule captured with tip‐enhanced Raman spectroscopy (TERS) can noticeably differ on that coming from standard far‐field Raman spectroscopy. In this work, we develop a theoretical approach for calculating Raman tensors of a single oblate molecule that takes near‐field...

Read More thumbnail image: Tipmodified Raman tensor of a porphine molecule

A design of experiments concept for the minimization of nonspecific peptide adsorption in the mass spectrometric determination of substance P and related hemokinin‐1

Published: Dec 5, 2019

Author(s): Martin Feickert, Bjoern B Burckhardt

Journal: Journal of Separation Science

Abstract Substance P and hemokinin‐1 were predominantly examined by immunoassays with their limitation to differentiate appropriately between both peptides. The use of liquid chromatography coupled with tandem mass spectrometry is a promising, highly selective alternative. Adsorption processes have been identified in preliminary experiments to play a crucial role in the loss of mass spectrometry intensity of both peptides. Therefore, a design of experiments concept was created to minimize...

Read More thumbnail image: A design of experiments concept for the minimization of nonspecific peptide adsorption in the mass spectrometric determination of substance P and related hemokinin1

Separation and determination of ciprofloxacin in seawater, human blood plasma and tablet samples using molecularly imprinted polymer pipette‐tip solid phase extraction and its optimization by response surface methodology

Published: Dec 5, 2019

Author(s): Sayyed Hossein Hashemi, Morteza Ziyaadini, Massoud Kaykhaii, Jamali Keikha Ahmad, Nasrin Naruie

Journal: Journal of Separation Science

Abstract By synthesizing a molecular imprinted polymer as an efficient adsorbent, ciprofloxacin was micro‐extracted from seawater, human blood plasma and tablet samples by pipette‐tip micro solid phase extraction and determined spectrophotometrically. Response surface methodology was applied with central composite design to build a model based on factors affecting on microextraction of ciprofloxacin; including volume of eluent solvent, number of extraction cycles, number of elution cycles, and...

Read More thumbnail image: Separation and determination of ciprofloxacin in seawater human blood plasma and tablet samples using molecularly imprinted polymer pipettetip solid phase extraction and its optimization by response surface methodology

MALDI imaging mass spectrometry of β‐ and γ‐crystallins in the ocular lens

Published: Dec 5, 2019

Author(s): David M. Anderson, Mitchell G. Nye‐Wood, Kristie L. Rose, Paul J. Donaldson, Angus C. Grey, Kevin L. Schey

Journal: Journal of Mass Spectrometry

Abstract Lens crystallin proteins make up 90% of expressed proteins in the ocular lens and are primarily responsible for maintaining lens transparency and establishing the gradient of refractive index necessary for proper focusing of images onto the retina. Age‐related modifications to lens crystallins have been linked to insolubilization and cataractogenesis in human lenses. Matrix‐assisted laser desorption/ionization (MALDI) imaging mass spectrometry (IMS) has been shown to provide spatial...

Read More thumbnail image: MALDI imaging mass spectrometry of  and crystallins in the ocular lens

Correlation of molecular and morphologic effects of thermoembolization in a swine model using mass spectrometry imaging

Published: Dec 5, 2019

Author(s): Chunxiao Guo, Dodge L. Baluya, Emily A. Thompson, Elizabeth M. Whitley, Erik N.K. Cressman

Journal: Journal of Mass Spectrometry

Abstract Hepatocellular carcinoma is a growing worldwide problem with a high mortality rate. This malignancy does not respond well to chemotherapy, and most patients present late in their disease at which time surgery is no longer an option. Over the past three decades, minimally invasive methods have evolved to treat unresectable disease and prolong survival. Intra‐arterial embolization techniques are used for large or multiple tumors but have distressingly high levels of local recurrence and...

Read More thumbnail image: Correlation of molecular and morphologic effects of thermoembolization in a swine model using mass spectrometry imaging

MALDI imaging directed laser ablation tissue microsampling for data independent acquisition proteomics

Published: Dec 5, 2019

Author(s): Kelin Wang, Fabrizio Donnarumma, Michael E. Pettit, Carson W. Szot, Touradj Solouki, Kermit K. Murray

Journal: Journal of Mass Spectrometry

Abstract A multimodal workflow for mass spectrometry imaging was developed that combines MALDI imaging with protein identification and quantification by liquid chromatography tandem mass spectrometry (LC‐MS/MS). Thin tissue sections were analyzed by MALDI imaging, and the regions of interest (ROI) were identified using a smoothing and edge detection procedure. A midinfrared laser at 3‐μm wavelength was used to remove the ROI from the brain tissue section after MALDI mass spectrometry imaging...

Read More thumbnail image: MALDI imaging directed laser ablation tissue microsampling for data independent acquisition proteomics

Comparative study and multiple linear regression analysis for assessment of chromatographic behavior of structurally related β‐blockers on different stationary phases

Published: Dec 5, 2019

Author(s): Ahmed Faried Abdel Hakiem, Ahmed Khairy Hamdy, Ahmed Safwat Aboraia

Journal: Journal of Separation Science

Abstract A quantitative structure–retention relationship study was performed by thin layer chromatography on a number of β‐blockers using 315 molecular descriptors of which nine were selected to be having the most important physicochemical properties. These descriptors provide good correlations with chromatographic behavior of the studied structurally related drugs. This research was completed on three pretreated silica gel plates via impregnation in urea, sodium dodecyl sulfate, and...

Read More thumbnail image: Comparative study and multiple linear regression analysis for assessment of chromatographic behavior of structurally related blockers on different stationary phases

Polyethyleneimine‐modified porous aromatic framework and silane coupling agent grafted graphene oxide composite materials for determination of phenolic acids in Chinese Wolfberry drink by HPLC

Published: Dec 5, 2019

Author(s): Yaying Lv, Tao Zhu

Journal: Journal of Separation Science

Abstract A simple method for the determination of phenolic acids in Chinese Wolfberry drink based on polyethyleneimine modified porous aromatic framework and graphene oxide composite sorbent for pipette‐tip solid‐phase extraction was developed. Porous aromatic framework and raphene oxide composite materials were grafted by silane coupling agent (3‐Chloropropyl)‐trimethoxysilane. The modified materials were characterized by five kinds of characterization. Experimental results showed that the...

Read More thumbnail image: Polyethyleneiminemodified porous aromatic framework and silane coupling agent grafted graphene oxide composite materials for determination of phenolic acids in Chinese Wolfberry drink by HPLC

Multifiber solid‐phase microextraction using different molecularly imprinted coatings for simultaneous selective extraction and sensitive determination of organophosphorus pesticides

Published: Dec 5, 2019

Author(s): Xiaozhe Xiang, Yulong Wang, Xiaowei Zhang, Mingquan Huang, Xiujuan Li, Siyi Pan

Journal: Journal of Separation Science

Abstract Three types of molecularly imprinted solid‐phase microextraction fibers were fabricated through sol‐gel method using diazinon, parathion‐methyl, and isocarbophos as templates, respectively, and assembled together to construct a multifiber for analysis of organophosphorus pesticides in complex matrices. The multifiber provided large extraction capacity and high imprinting factor up to 3.89. In contrast, the imprinting factor of a single fiber was around 1.6, and the multi‐template...

Read More thumbnail image: Multifiber solidphase microextraction using different molecularly imprinted coatings for simultaneous selective extraction and sensitive determination of organophosphorus pesticides

Application of capillary electrophoretic methods for the analysis of plant phloem and xylem saps composition: A review

Published: Dec 5, 2019

Author(s): Natália Melicherová, Roman Řemínek, František Foret

Journal: Journal of Separation Science

Abstract Plant vascular tissue is essential for the exchange of water, nutrients, metabolic products, and signals among distant organs in cormophytes. The compositions of phloem and xylem saps are highly dependent on many internal and external factors, and thus their analysis provides a valuable insight into plant physiology, growth, and development as well as nutrition status or presence of biotic or abiotic stresses. Capillary electrophoresis characterized by highly efficient separations and...

Read More thumbnail image: Application of capillary electrophoretic methods for the analysis of plant phloem and xylem saps composition A review

Self‐assembly of poly(ionic liquid) functionalized mesoporous magnetic microspheres for the solid‐phase extraction of preservatives from milk samples

Published: Dec 5, 2019

Author(s): Yiqian Gao, Yucen Wang, Yinghua Yan, Keqi Tang, Chuan‐Fan Ding

Journal: Journal of Separation Science

Abstract In this work, a novel, rapid, and simple analytical method was proposed for the detection of parabens in milk sample by gas chromatography coupled with mass spectrometry. At the same time, milk sample was pretreated by magnetic solid phase extraction, which detected up to five parabens. A series of important parameters of magnetic solid phase extraction were investigated and optimized, such as pH value of loading buffer, amount of material, adsorption time, ionic strength, eluting...

Read More thumbnail image: Selfassembly of polyionic liquid functionalized mesoporous magnetic microspheres for the solidphase extraction of preservatives from milk samples
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