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Pressurizing the mixtures of two ionic liquids: Crystallization versus vetrification

Published: Sep 20, 2017

Author(s): F. Capitani, F. Trequattrini, O. Palumbo, P. Roy, P. Postorino, A. Paolone

Journal: Journal of Raman Spectroscopy

Abstract A series of mixtures prepared with different content of the ionic liquids N‐trimethyl‐N‐propylammonium bis(trifluoromethylsulfonyl)imide (TMPA‐TFSI) and N‐trimethyl‐N‐hexylammonium bis(trifluoromethylsulfonyl)imide (TMHA‐TFSI), namely, (TMPA‐TFSI)100−x (TMHA‐TFSI)x, is investigated by means of Raman spectroscopy as a function of pressure at room temperature. Both pure TMPA‐TFSI and the x = 2 mixture crystallize under an...

Read More thumbnail image: Pressurizing the mixtures of two ionic liquids Crystallization versus vetrification

Region‐specific impairment of the cervical spinal cord (SC) in amyotrophic lateral sclerosis: A preliminary study using SC templates and quantitative MRI (diffusion tensor imaging/inhomogeneous magnetization transfer)

Published: Sep 19, 2017

Author(s): Henitsoa Rasoanandrianina, Aude‐Marie Grapperon, Manuel Taso, Olivier M. Girard, Guillaume Duhamel, Maxime Guye, Jean‐Philippe Ranjeva, Shahram Attarian, Annie Verschueren, Virginie Callot

Journal: NMR in Biomedicine

In this preliminary study, our objective was to investigate the potential of high‐resolution anatomical imaging, diffusion tensor imaging (DTI) and conventional/inhomogeneous magnetization transfer imaging [magnetization transfer (MT)/inhomogeneous magnetization transfer (ihMT)] at 3 T, analyzed with template‐extracted regions of interest, to measure the atrophy and structural changes of white (WM) and gray (GM) matter spinal cord...

Read More thumbnail image: Regionspecific impairment of the cervical spinal cord SC in amyotrophic lateral sclerosis A preliminary study using SC templates and quantitative MRI diffusion tensor imaginginhomogeneous magnetization transfer

Ultra‐performance liquid chromatography–tandem mass spectrometry assay for determination of plasma nomegestrol acetate and estradiol in healthy postmenopausal women

Published: Sep 19, 2017

Author(s): Sneha G. Nair, Daxesh P. Patel, Mallika Sanyal, Puran Singhal, Pranav S. Shrivastav

Journal: Biomedical Chromatography

Abstract A highly sensitive and selective ultra‐performance liquid chromatography–tandem mass spectrometry method is described for the simultaneous determination of nomegestrol acetate (NOMAC), a highly selective progestogen, and estradiol (E2), a natural estrogen in human plasma. NOMAC was obtained from plasma by solid‐phase extraction, while E2 was first separated by liquid–liquid extraction with methyl tert‐butyl ether followed...

Read More thumbnail image: Ultraperformance liquid chromatographytandem mass spectrometry assay for determination of plasma nomegestrol acetate and estradiol in healthy postmenopausal women

Development and validation of a simple high‐performance liquid chromatography analytical method for simultaneous determination of phytosterols, cholesterol and squalene in parenteral lipid emulsions

Published: Sep 19, 2017

Author(s): Ana Novak, Mercè Gutiérrez‐Zamora, Lluís Domenech, Josep M. Suñé‐Negre, Montserrat Miñarro, Encarna García‐Montoya, Josep M. Llop, Josep R. Ticó, Pilar Pérez‐Lozano

Journal: Biomedical Chromatography

Abstract A simple analytical method for simultaneous determination of phytosterols, cholesterol and squalene in lipid emulsions was developed owing to increased interest in their clinical effects. Method development was based on commonly used stationary (C18, C8 and phenyl) and mobile phases (mixtures of acetonitrile, methanol and water) under isocratic conditions. Differences in stationary phases resulted in peak overlapping or...

Read More thumbnail image: Development and validation of a simple highperformance liquid chromatography analytical method for simultaneous determination of phytosterols cholesterol and squalene in parenteral lipid emulsions

Identification of the constituents and metabolites in rats after oral administration of Zi Shen Formula by UPLC‐Q‐TOF/MS combined pattern recognition analysis

Published: Sep 19, 2017

Author(s): Yanchao Zheng, Yidan Zhang, Shihan Geng, Mengxi Xu, Qingshen Yin, Lili Song, Pengwei Zhuang, Yanjun Zhang

Journal: Biomedical Chromatography

Abstract An ultra‐high‐performance liquid chromatography mass spectrometry method was established to detect and identify the chemical constituents of Zi Shen Formula (ZSF) and its metabolites in serum, urine and feces, after oral administration to rats. A total of 68 compounds were characterized in ZSF extracts. In vivo, 38 prototype components and 32 metabolites of ZSF were tentatively identified in rat serum, urine and feces. Seven metabolic ...

Read More thumbnail image: Identification of the constituents and metabolites in rats after oral administration of Zi Shen Formula by UPLCQTOFMS combined pattern recognition analysis

Determination of electroosmotic and electrophoretic mobility of DNA and dyes in low ionic strength solutions

Published: Sep 15, 2017

Author(s): Joshua Lallman, Rachel Flaugh, Kristy L. Kounovsky‐Shafer

Journal: ELECTROPHORESIS

Abstract Nanocoding, a genome analysis platform, relies on very low ionic strength conditions to elongate DNA molecules up to 1.06 (fully stretched DNA = 1). Understanding how electroosmotic and electrophoretic forces vary, as ionic strength decreases, will enable better Nanocoding devices, or other genome analysis platforms, to be developed. Using gel electrophoresis to determine overall mobility (includes contributions...

Read More thumbnail image: Determination of electroosmotic and electrophoretic mobility of DNA and dyes in low ionic strength solutions

A megaporous material harbouring a peptide ligand for affinity IgG purification

Published: Sep 15, 2017

Author(s): Foad Tehrani Najafian, Noor Shad Bibi, Tuhidul Islam, Marcelo Fernández‐Lahore

Journal: ELECTROPHORESIS

Abstract Common limitations of Protein A affinity chromatography include high adsorbent costs, ligand instability and possible ligand leakage. In this study, a short peptide with affinity for IgG was synthesized chemically and subsequently immobilized on a megaporous support. The support was prepared utilising the cryogel technique while the peptide‐ligand was covalently immobilised via thiol‐epoxy click chemistry. The cryogel...

Read More thumbnail image: A megaporous material harbouring a peptide ligand for affinity IgG purification

Clinical Implications of Compounds Designed to Inhibit ECM‐Modifying Metalloproteinases

Published: Sep 15, 2017

Author(s): Sabrina Amar, Dmitriy Minond, Gregg B. Fields

Journal: PROTEOMICS

Abstract Remodeling of the extracellular matrix (ECM) is crucial in development and homeostasis, but also has a significant role in disease progression. Two metalloproteinase families, the matrix metalloproteinases (MMPs) and a disintegrin and metalloproteases (ADAMs), participate in the remodeling of the ECM, either directly or through the liberation of growth factors and cell surface receptors. The correlation of MMP and ADAM...

Read More thumbnail image: Clinical Implications of Compounds Designed to Inhibit ECMModifying Metalloproteinases

Can increased spatial resolution solve the crossing fiber problem for diffusion MRI?

Published: Sep 15, 2017

Author(s): Kurt Schilling, Yurui Gao, Vaibhav Janve, Iwona Stepniewska, Bennett A. Landman, Adam W. Anderson

Journal: NMR in Biomedicine

It is now widely recognized that voxels with crossing fibers or complex geometrical configurations present a challenge for diffusion MRI (dMRI) reconstruction and fiber tracking, as well as microstructural modeling of brain tissues. This “crossing fiber” problem has been estimated to affect anywhere from 30% to as many as 90% of white matter voxels, and it is often assumed that increasing spatial resolution will decrease the prevalence of...

Read More thumbnail image: Can increased spatial resolution solve the crossing fiber problem for diffusion MRI

An improved model for prostate diffusion incorporating the results of Monte Carlo simulations of diffusion in the cellular compartment

Published: Sep 15, 2017

Author(s): Nima Gilani, Paul Malcolm, Glyn Johnson

Journal: NMR in Biomedicine

The purpose of this work was to refine a previously published model of prostate diffusion by incorporating improved estimates of cellular diffusivity obtained by Monte Carlo simulation. Stromal and epithelial cell size and intracellular volume fraction in different grades of cancer were determined from histological images. Diffusion in different mixtures of cells, corresponding to different tumor grades, was simulated...

Read More thumbnail image: An improved model for prostate diffusion incorporating the results of Monte Carlo simulations of diffusion in the cellular compartment

31 P magnetic resonance fingerprinting for rapid quantification of creatine kinase reaction rate in vivo

Published: Sep 15, 2017

Author(s): Charlie Y. Wang, Yuchi Liu, Shuying Huang, Mark A. Griswold, Nicole Seiberlich, Xin Yu

Journal: NMR in Biomedicine

The purpose of this work was to develop a 31P spectroscopic magnetic resonance fingerprinting (MRF) method for fast quantification of the chemical exchange rate between phosphocreatine (PCr) and adenosine triphosphate (ATP) via creatine kinase (CK). A 31P MRF sequence (CK‐MRF) was developed to quantify the forward rate constant of ATP synthesis via CK ( k ...

Read More thumbnail image: 31 P magnetic resonance fingerprinting for rapid quantification of creatine kinase reaction rate in vivo

Aligned diphenylalanine nanotube–silver nanoparticle templates for high‐sensitivity surface‐enhanced Raman scattering

Published: Sep 15, 2017

Author(s): Sawsan Almohammed, Stefano Fedele, Brian J. Rodriguez, James H. Rice

Journal: Journal of Raman Spectroscopy

Abstract Self‐assembly offers potential routes for large‐scale, rapid, and cost‐effective surface‐enhanced Raman scattering (SERS) substrate designs. Here, a highly sensitive SERS template is reported, which utilizes aligned diphenylalanine nanotubes to form a dense packing arrangement of plasmon‐active silver nanoparticles. The template is stable under high laser illumination with a power density of ~6.25 MW/cm2 in comparison...

Read More thumbnail image: Aligned diphenylalanine nanotubesilver nanoparticle templates for highsensitivity surfaceenhanced Raman scattering

Vibrational properties of layered BiTeCl single crystal

Published: Sep 15, 2017

Author(s): Wei Zhou, Jiating Lu, Gang Xiang, Shuangchen Ruan

Journal: Journal of Raman Spectroscopy

Abstract Bismuth tellurohalides have intrigued numerous interests for their novel Rashba splitting electronic structures with potential applications in spintronics and two‐dimensional (2D) optoelectronics. In this work, we have a detailed study of bulk BiTeCl and its exfoliated flakes using ultralow wavenumber Raman spectroscopy. We observe all BiTeCl characteristic Raman modes including the lowest wavenumber rigid layer in‐plane...

Read More thumbnail image: Vibrational properties of layered BiTeCl single crystal

An easy approach to reveal the metallic nature of graphene by Breit–Wigner–Fano lineshapes using Raman spectroscopy

Published: Sep 15, 2017

Author(s): Zainab Zafar, Amina Zafar, Yong Tian, Zhimin Cao, Biaobing Jin, Zhixiang Shi

Journal: Journal of Raman Spectroscopy

Electron–phonon coupling enhancement in metal‐doped single‐layer graphene has been investigated. Different metal adatoms were deposited on chemical vapor deposition (CVD) graphene and annealed at high temperature under vacuum. The interaction between these metals and graphene was studied by Raman spectroscopy. A significant variation in peak width has been observed as a function of annealing temperature. This broadening of the Raman...

Read More thumbnail image: An easy approach to reveal the metallic nature of graphene by BreitWignerFano lineshapes using Raman spectroscopy

Raman spectroscopy as a novel method in placental research: Recognizing the pattern of placental hypoxia

Published: Sep 15, 2017

Author(s): Natalia Schlabritz‐Loutsevitch, Kushal Gandhi, Fatimah Soydemir, Paul Brownbill, Raghvendra Sengar, Gary Ventolini, Paul Bruillard, Luke Gosink

Journal: Journal of Raman Spectroscopy

Abstract Raman spectroscopy (RS) is a nonelastic photon scattering technique. We evaluated whether a specific RS pattern exists in fetal venous perfusates obtained at 30‐ to 60‐min intervals from the ex vivo human dual placental perfusion model under hypoxic (n = 6) and normoxic (n = 5) conditions. A stratified principle component and a linear support vector machine analyses showed that the separation between 2...

Read More thumbnail image: Raman spectroscopy as a novel method in placental research Recognizing the pattern of placental hypoxia

Raman‐based technique for measuring thermal conductivity of graphene and related materials

Published: Sep 15, 2017

Author(s): Hoda Malekpour, Alexander A. Balandin

Journal: Journal of Raman Spectroscopy

We describe Raman spectroscopy‐based method of measuring thermal conductivity of thin films and review significant results achieved with this technique pertinent to graphene and other two‐dimensional materials. The optothermal Raman method was instrumental for the discovery of unique heat conduction properties of graphene. In this method, Raman spectroscopy is used to determine the local temperature of the sample, while the excitation...

Read More thumbnail image: Ramanbased technique for measuring thermal conductivity of graphene and related materials

Applications of Raman spectroscopy in graphene‐related materials and the development of parameterized PCA for large‐scale data analysis

Published: Sep 15, 2017

Author(s): João Luiz Elias Campos, Hudson Miranda, Cassiano Rabelo, Emil Sandoz‐Rosado, Sugandha Pandey, Juha Riikonen, Abraham G. Cano‐Marquez, Ado Jorio

Journal: Journal of Raman Spectroscopy

A methodology for the structural analysis of graphene‐related materials using parameterized principal component analysis (PCA), ideal for large‐scale data treatment, is introduced. First, we review different aspects of Raman spectroscopy for structural and functional characterization of sp2‐bonded carbon materials, which are important for understanding the problem. The parameterized PCA is then introduced and applied to 2 different...

Read More thumbnail image: Applications of Raman spectroscopy in graphenerelated materials and the development of parameterized PCA for largescale data analysis

Determination of higenamine and coclaurine levels in human urine after the administration of a throat lozenge containing Nandina domestica fruit

Published: Sep 15, 2017

Author(s): Masato Okano, Mitsuhiko Sato, Shinji Kageyama

Journal: Drug Testing and Analysis

Higenamine is a key component of traditional Chinese herbal medicine. The fruit of Nandina domestica (which contains this component) is available as an ingredient in the so‐called Nanten‐nodo‐ame throat lozenge found on the Japanese market, which is an over‐the‐counter pharmaceutical and is easy to purchase for Japanese athletes. However, higenamine is a non‐selective β2‐agonist, which is exemplified in the prohibited list of the World Anti‐Doping...

Read More thumbnail image: Determination of higenamine and coclaurine levels in human urine after the administration of a throat lozenge containing Nandina domestica fruit

Introducing special issue on chemical image analysis

Published: Sep 15, 2017

Author(s): Cyril Ruckebusch

Journal: Journal of Chemometrics

Read More thumbnail image: Introducing special issue on chemical image analysis

A ToF‐SIMS investigation on correlation between grinding environments and sphalerite surface chemistry: Implications for mineral selectivity in flotation

Published: Sep 15, 2017

Author(s): Liuyin Xia, Brian Hart, Zhe Chen, Mark Furlotte, Gary Gingras, Patrick Laflamme

Journal: Surface and Interface Analysis

Changes in mineral surface properties during grinding play a key role in flotation performance. ToF‐SIMS surface chemical analytical studies have shown that flotation separation of sphalerite from chalcopyrite is significantly affected by the oxidation of metal species on the surface of sphalerite. The intensity of iron oxyhydroxyl species on the surface of sphalerite has a positive correlation with poor recovery of sphalerite. Given the...

Read More thumbnail image: A ToFSIMS investigation on correlation between grinding environments and sphalerite surface chemistry Implications for mineral selectivity in flotation
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