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Use of Stokes and anti‐Stokes Raman scattering for new applications

Published: Dec 4, 2018

Author(s): Thomas H. Kauffmann, Ninel Kokanyan, Marc D. Fontana

Journal: Journal of Raman Spectroscopy

Abstract We show the interest in recording both Stokes and anti‐Stokes Raman spectra in two peculiar applications. In one case, the comparison between these two parts of the spectrum, measured at one temperature only, allows to distinguish between first‐ and second‐order phonon bands. In the second example, the difference between Stokes and anti‐Stokes spectra provides separation between vibrational and emission lines. We describe...

Read More thumbnail image: Use of Stokes and antiStokes Raman scattering for new applications

The energy of hydrogen bonds in aqueous suspensions of nanodiamonds with different surface functionalization

Published: Dec 4, 2018

Author(s): K.A. Laptinskiy, A.N. Bokarev, S.A. Dolenko, I.L. Plastun, O.E. Sarmanova, O.A. Shenderova, T.A. Dolenko

Journal: Journal of Raman Spectroscopy

Abstract As a result of an experimental study of the Raman scattering valence bands of water in aqueous suspensions of detonation nanodiamonds with different functional surface groups, the energies of hydrogen bonds in suspensions of nanoparticles were calculated for the first time. It is shown that the degree of influence of different functional surface groups of nanodiamonds on hydrogen bonds in aqueous suspension decreases in the...

Read More thumbnail image: The energy of hydrogen bonds in aqueous suspensions of nanodiamonds with different surface functionalization

Single‐cell Raman microscopy of microengineered cell scaffolds

Published: Dec 4, 2018

Author(s): Sara J. Baldock, Abdullah C.S. Talari, Rachael Smith, Karen L. Wright, Lorna Ashton

Journal: Journal of Raman Spectroscopy

Abstract Studying cells in a three‐dimensional (3D) environment has great potential in understanding cell behaviours such as morphology, proliferation, differentiation, and migration. Microengineered 3D cell scaffolds with precise defined geometries have offered a new approach to study cell behaviour and its interactions with scaffolds. The use of Raman spectroscopy to characterise biomolecules is a rapidly expanding area and has...

Read More thumbnail image: Singlecell Raman microscopy of microengineered cell scaffolds

Synthesis of magnetic nanoparticle‐based molecularly imprinted polymer as a selective sorbent for efficient extraction of ezetimibe from biological samples

Published: Dec 3, 2018

Author(s): Moazameh Peyrovi, Mohammadreza Hadjmohammadi, Iman Saeidi

Journal: Biomedical Chromatography

Abstract In the present study, a novel and efficient adsorbent constructed of molecularly imprinted polymer on the surface of modified magnetic nanoparticles with oleic acid (MNPs) was applied for the selective extraction of ezetimibe. The magnetic molecularly imprinted polymer (MMIP) was polymerized at the surface of modified MNPs using methacrylic acid as functional monomer, ezetimibe as template and ethylene glycol dimethacrylate...

Read More thumbnail image: Synthesis of magnetic nanoparticlebased molecularly imprinted polymer as a selective sorbent for efficient extraction of ezetimibe from biological samples

Simultaneous determination of fifteen multiclass organic pollutants in human saliva and serum by liquid chromatography–tandem ultraviolet/fluorescence detection: A validated method

Published: Dec 3, 2018

Author(s): Giacomo Russo, Francesco Barbato, Damiano Gustavo Mita, Lucia Grumetto

Journal: Biomedical Chromatography

Abstract A quick and inexpensive validated method, based on sample treatment by liquid–liquid microextraction followed by liquid chromatography (LC) coupled with ultraviolet tandem fluorescence detection is proposed for the determination of 15 multiclass pollutants both in serum and in saliva, as a simple and easy to draw matrix. The method was set up and validated according to European guidelines. The compounds of interest include...

Read More thumbnail image: Simultaneous determination of fifteen multiclass organic pollutants in human saliva and serum by liquid chromatographytandem ultravioletfluorescence detection A validated method

Fast screening of aflatoxins in dairy cattle feeds with CE‐LIF method combined with preconcentration technique of vortex assisted low density solvent–microextraction

Published: Dec 3, 2018

Author(s): Jing Gao, Jing Wang, Chengxin Wu, Fujiang Hou, Shenghua Chang, Zhaofeng Wang, Qiaosheng Pu, Ding Guo, Hua Fu

Journal: ELECTROPHORESIS

Abstract Aflatoxin contamination in agricultural products poses a great threat to humans and livestock. The aim of this study was to establish a simple, rapid, highly sensitive, and inexpensive method for the simultaneous detection of aflatoxin B1, B2, G1, and G2 in agricultural products. We used a vortex assisted low density solvent–microextraction (VALDS‐ME) technique for sample preconcentration and sample detection was achieved with a CE‐LIF...

Read More thumbnail image: Fast screening of aflatoxins in dairy cattle feeds with CELIF method combined with preconcentration technique of vortex assisted low density solventmicroextraction

Resistive pulse sensing as particle counting and sizing method in microfluidic systems: Designs and applications review

Published: Dec 3, 2018

Author(s): Tomas Vaclavek, Jan Prikryl, Frantisek Foret

Journal: Journal of Separation Science

Abstract Resistive pulse sensing is a well‐known and established method for counting and sizing particles in ionic solutions. Throughout its development the technique has been expanded from detection of biological cells to counting nanoparticles and viruses, and even registering individual molecules, e.g., nucleotides in nucleic acids. This technique combined with microfluidic or nanofluidic systems shows great potential for various...

Read More thumbnail image: Resistive pulse sensing as particle counting and sizing method in microfluidic systems Designs and applications review

Stability of mephedrone and five of its phase I metabolites in human whole blood

Published: Dec 3, 2018

Author(s): Joanna Czerwinska, Mark C. Parkin, Paul I. Dargan, Claire George, Andrew T. Kicman, Vincenzo Abbate

Journal: Drug Testing and Analysis

Abstract Mephedrone is a new psychoactive substance known to be unstable in biological matrices stored at room temperature or refrigerated. While the instability of mephedrone has been investigated before, there is currently no data regarding the stability of mephedrone metabolites. In this study, a liquid chromatography–tandem mass spectrometry method for the simultaneous quantification of mephedrone and five of its phase I...

Read More thumbnail image: Stability of mephedrone and five of its phase I metabolites in human whole blood

Hard modeling study of chemical equilibria in mixed solvents

Published: Dec 2, 2018

Author(s): Saheleh Sheykhizadeh, Abdolhossein Naseri, Hamid Abdollahi

Journal: Journal of Chemometrics

Abstract In many years, intensive researches have focused on studying the chemical equilibria like complex formation and acid‐base titration in different solvent mixtures, such as methanol‐water. In this respect, it has been revealed that methanol‐water mixture is not a simple homogenous ideal mixture and it contains clusters of pure water (W), pure methanol (M), and associated methanol‐water molecules (MW) with a certain...

Read More thumbnail image: Hard modeling study of chemical equilibria in mixed solvents

Using magnetic core‐shell nanoparticles coated with an ionic liquid dispersion assisted by effervescence powder for the micro‐solid‐phase extraction of four beta blockers from human plasma by ultra high performance liquid chromatography with mass spectrometry detection

Published: Nov 30, 2018

Author(s): Sara Jamshidi, Mohammad Kazem Rofouei, Gunnar Thorsen

Journal: Journal of Separation Science

Abstract In this work, a novel, efficient, and green sorbent, SiO2@Fe3O4 has been created and functionalized with 1‐butyl‐3‐methylimidazolium hexafluorophosphate as an ionic liquid. This sorbent was applied for microextraction of four beta blockers, propranolol, metoprolol, atenolol, and alprenolol with bupivacaine as internal standard from human plasma followed by liquid chromatography with mass spectrometric detection. A mixture of sodium ...

Read More thumbnail image: Using magnetic coreshell nanoparticles coated with an ionic liquid dispersion assisted by effervescence powder for the microsolidphase extraction of four beta blockers from human plasma by ultra high performance liquid chromatography with mass spectrometry detection

The dynamics of band (peak) shape development in capillary zone electrophoresis in light of the linear theory of electromigration

Published: Nov 30, 2018

Author(s): Martin Dvořák, Pavel Dubský, Magda Dovhunová, Bohuslav Gaš

Journal: ELECTROPHORESIS

Abstract The continuity equations that describe the movement of ions in liquid solutions under the influence of an external stationary electric field, as it is utilized in electrophoresis, were introduced a long time ago starting with Kohlrausch in 1897. From that time on, there have been many attempts to solve the equations and to discuss the results. In electrophoresis, special attention has always been devoted to the peak shapes...

Read More thumbnail image: The dynamics of band peak shape development in capillary zone electrophoresis in light of the linear theory of electromigration

Tools and resources for metabolomics research community: A 2017–2018 update

Published: Nov 30, 2018

Author(s): Biswapriya B. Misra, Subhashree Mohapatra

Journal: ELECTROPHORESIS

Abstract The scale at which MS‐ and NMR‐based platforms generate metabolomics datasets for both research, core, and clinical facilities to address challenges in the various sciences—ranging from biomedical to agricultural—is underappreciated. Thus, metabolomics efforts spanning microbe, environment, plant, animal, and human systems have led to continual and concomitant growth of in silico resources for analysis and interpretation of...

Read More thumbnail image: Tools and resources for metabolomics research community A 20172018 update

Electrokinetics over hydrophobic surfaces

Published: Nov 30, 2018

Author(s): Pratyaksh Karan, Jeevanjyoti Chakraborty, Suman Chakraborty

Journal: ELECTROPHORESIS

Abstract Segregation of phases in the vicinity of hydrophobic surfaces may turn out to be immensely consequential towards altering the coupling of electrostatics and hydrodynamics over interfacial scales. Here, we review the fundamental advances towards bringing out the various facets of electrokinetic transport over hydrophobic interfaces. We lay significant emphasis on the developments in understanding the slippery...

Read More thumbnail image: Electrokinetics over hydrophobic surfaces

Porins and Amyloids are Coded by Similar Sequence Motifs

Published: Nov 30, 2018

Author(s): Etienne Villain, Aleksei A. Nikekhin, Andrey V. Kajava

Journal: PROTEOMICS

Abstract The relationship between amino acid sequences of the β‐hairpin structures and amyloidogenic β‐arcade‐forming motifs are of special interest because, similar to amyloid fibrils, most of the β‐hairpin repeat (BHR) structures have the so‐called cross‐β arrangement. Moreover, β‐hairpin is considered as a probable intermediate structure in amyloidogenesis. In this work, a bioinformatics sequence analysis of the known BHR...

Read More thumbnail image: Porins and Amyloids are Coded by Similar Sequence Motifs

Discovery of cancer cell proliferation inhibitors from Salviae miltiorrhizae radix et rhizoma by a trace peak enrichment approach

Published: Nov 30, 2018

Author(s): Xiao‐wei Zhang, Lin Yang, Lin An, Ping Li, Jun Chen

Journal: Journal of Separation Science

Abstract Salviae miltiorrhizae radix et rhizoma is a traditional herbal medicine with anti‐cancer activities. In this work, a trace peak enrichment approach combined with a cell proliferation assay was applied for screening cancer cell proliferation inhibitors from the extract of S. miltiorrhiza. A set of 123 peak fractions were prepared, and by comprehensive screening, 21 tanshinones were screened out as cancer cell proliferation inhibitors...

Read More thumbnail image: Discovery of cancer cell proliferation inhibitors from Salviae miltiorrhizae radix et rhizoma by a trace peak enrichment approach

Simultaneous determination of selected estrogenic endocrine disrupting chemicals and bisphenol A residues in whole milk using fabric phase sorptive extraction coupled to HPLC‐UV detection and LC‐MS/MS

Published: Nov 30, 2018

Author(s): Rodolfo Mesa, Abuzar Kabir, Victoria Samanidou, Kenneth G. Furton

Journal: Journal of Separation Science

Abstract A simple and sensitive analytical methodology is developed for rapid screening and quantification of selected estrogenic endocrine disrupting chemicals and bisphenol A from intact milk using fabric phase sorptive extraction in combination with high‐performance liquid chromatography coupled to ultraviolet detection/tandem mass spectrometry. The new approach eliminates protein precipitation and defatting step from the sample...

Read More thumbnail image: Simultaneous determination of selected estrogenic endocrine disrupting chemicals and bisphenol A residues in whole milk using fabric phase sorptive extraction coupled to HPLCUV detection and LCMSMS

Study on the metabolites of betulinic acid in vivo and in vitro by ultra high performance liquid chromatography with time‐of‐flight mass spectrometry

Published: Nov 30, 2018

Author(s): Wen‐dan Zhang, Miao‐miao Jin, Hong‐hong Jiang, Jian‐xi Yang, Qiao Wang, Ying‐feng Du, Liang Cao, Hui‐jun Xu

Journal: Journal of Separation Science

Abstract Betulinic acid is a triterpenoid organic acid with remarkable antitumor properties and is naturally present in many fruits, condiments and traditional Chinese medicines. Currently, a strategy was developed for the identification of metabolites following the in vivo and in vitro biotransformation of Betulinic acid with rat intestinal bacteria utilizing ultra high performance liquid chromatography with time‐of‐flight mass...

Read More thumbnail image: Study on the metabolites of betulinic acid in vivo and in vitro by ultra high performance liquid chromatography with timeofflight mass spectrometry

Using natural deep eutectic solvents for the extraction of metabolites in Byrsonima intermedia leaves

Published: Nov 30, 2018

Author(s): Karina Fraige, R. Dario Arrua, Adam T. Sutton, Cristiano Soleo Funari, Alberto José Cavalheiro, Emily F. Hilder, Vanderlan da Silva Bolzani

Journal: Journal of Separation Science

Abstract Natural deep eutectic solvents have been used as an alternative to organic solvents for the extraction of plants metabolites, allowing for the extraction of compounds of different polarities, while being inexpensive, non‐toxic, and easy to prepare. This work presents the comparison of the chromatographic profiles by high‐performance liquid chromatography with diode‐array detection obtained from Byrsonima intermedia...

Read More thumbnail image: Using natural deep eutectic solvents for the extraction of metabolites in Byrsonima intermedia leaves

Conformational Characterization and Classification of Intrinsically Disordered Proteins by Native Mass Spectrometry and Charge‐State Distribution Analysis

Published: Nov 30, 2018

Author(s): Carlo Santambrogio, Antonino Natalello, Stefania Brocca, Erika Ponzini, Rita Grandori

Journal: PROTEOMICS

Abstract Intrinsically disordered proteins (IDPs) are systematically under‐represented in structural proteomics studies. Their structural characterization implies description of the dynamic conformational ensembles populated by these polymers in solution, posing major challenges to biophysical methods. “Native” MS (native‐MS) has emerged as a central tool in this field, conjugating the unique MS analytical power with structurally...

Read More thumbnail image: Conformational Characterization and Classification of Intrinsically Disordered Proteins by Native Mass Spectrometry and ChargeState Distribution Analysis

Redefining Tissue Crosstalk via Shotgun Proteomic Analyses of Plasma Extracellular Vesicles

Published: Nov 30, 2018

Author(s): Martin Whitham, Mark A. Febbraio

Journal: PROTEOMICS

Abstract Protein signaling between tissues, or tissue cross‐talk is becoming recognized as a fundamental biological process that is incompletely understood. Shotgun proteomic analyses of tissues and plasma to explore this concept are regularly challenged by high dynamic range of protein abundance, which limits the identification of lower abundance proteins. In this viewpoint article, it is highlighted how a focus on proteins...

Read More thumbnail image: Redefining Tissue Crosstalk via Shotgun Proteomic Analyses of Plasma Extracellular Vesicles
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