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Chromatographic behavior of new deazapurine ribonucleosides in hydrophilic interaction liquid chromatography

Published: Jul 9, 2018

Author(s): Květa Kalíková, Markéta Voborná, Eva Tesařová

Journal: ELECTROPHORESIS

Abstract The chromatographic behavior of new biogenic purine nucleosides in hydrophilic interaction liquid chromatography was examined on three different stationary phases, namely bare silica, and amide‐ and cyclofructan‐based stationary phases. The effects of buffer concentration, pH and acetonitrile‐to‐aqueous‐part ratio in the mobile phase on retention and peak shape were assessed. The retention coefficients and peak symmetry...

Read More thumbnail image: Chromatographic behavior of new deazapurine ribonucleosides in hydrophilic interaction liquid chromatography

Separation and determination of corynoxine and corynoxine B using chiral ionic liquid and hydroxypropyl‐β‐cyclodextrin as additives by field‐amplified sample stacking in capillary electrophoresis

Published: Jul 9, 2018

Author(s): Zhiying Wang, Haitao Guo, Meng Chen, Guangbin Zhang, Ruimiao Chang, Anjia Chen

Journal: ELECTROPHORESIS

Abstract A sensitive, fast, and effective method, field‐amplified sample stacking (FASS) in capillary electrophoresis, has been established for the separation and determination of corynoxine and corynoxine B. Hydroxypropyl‐β‐CD (HP‐β‐CD) and tetrabutylammonium‐L‐glutamic acid (TBA‐L‐Glu) were used as additives in the separation system. Electrokinetic injection was chosen to introduce sample from inlet at 10 kV for 50 s...

Read More thumbnail image: Separation and determination of corynoxine and corynoxine B using chiral ionic liquid and hydroxypropylcyclodextrin as additives by fieldamplified sample stacking in capillary electrophoresis

Online fully automated SPE‐HPLC‐MS/MS determination of ceftiofur in bovine milk samples employing a silica‐anchored ionic liquid as sorbent

Published: Jul 9, 2018

Author(s): Débora Cecatto Ferreira, Ana Lúcia Toffoli, Edvaldo Vasconcelos Soares Maciel, Fernando Mauro Lanças

Journal: ELECTROPHORESIS

Abstract Solid‐phase extraction coupled online with high performance liquid chromatography and tandem mass spectrometry was successfully applied to determine low concentrations of ceftiofur antibiotic in bovine milk samples. A silica‐anchored ionic liquid was applied as sorbent material to be used as extraction phase in the proposed online system. The material was characterized by Fourier transform infrared spectroscopy and scanning...

Read More thumbnail image: Online fully automated SPEHPLCMSMS determination of ceftiofur in bovine milk samples employing a silicaanchored ionic liquid as sorbent

Elliptical localization with pulsed second‐order fields (ECLIPSE) for robust lipid suppression in proton MRSI

Published: Jul 9, 2018

Author(s): Robin A. Graaf, Peter B. Brown, Henk M. De Feyter, Scott McIntyre, Terence W. Nixon

Journal: NMR in Biomedicine

Proton MRSI has great clinical potential for metabolic mapping of the healthy and pathological human brain. Unfortunately, the promise has not yet been fully achieved due to numerous technical challenges related to insufficient spectral quality caused by magnetic field inhomogeneity, insufficient RF transmit power and incomplete lipid suppression. Here a robust, novel method for lipid suppression in 1H MRSI is presented. The method is...

Read More thumbnail image: Elliptical localization with pulsed secondorder fields ECLIPSE for robust lipid suppression in proton MRSI

Combining liquid chromatography and tandem mass spectrometry approaches to the study of monoterpene glycosides (aroma precursors) in wine grape

Published: Jul 9, 2018

Author(s): Riccardo Flamini, Marta Menicatti, Mirko De Rosso, Massimo Gardiman, Christine Mayr, Marco Pallecchi, Giovanna Danza, Gianluca Bartolucci

Journal: Journal of Mass Spectrometry

Abstract Monoterpene‐glycosides are important aroma precursors that, undergo hydrolysis, confer intense floral notes to the wines. Therefore, the knowledge of the nature of the sugar residues and the structure of these molecules is of great interest. In present study, liquid chromatography (LC) separation coupled with different mass spectrometry (MS) experiments for the characterization of these compounds were explored. The LC...

Read More thumbnail image: Combining liquid chromatography and tandem mass spectrometry approaches to the study of monoterpene glycosides aroma precursors in wine grape

Multivariate analysis of Raman spectra of carbonaceous black drawing media for the in situ identification of historic artist materials

Published: Jul 8, 2018

Author(s): Nathan S. Daly, Michelle Sullivan, Lynn Lee, Karen Trentelman

Journal: Journal of Raman Spectroscopy

Abstract The identification of black drawing materials in works of art on paper is often important for their conservation and crucial to gain insight about artists' methodologies and the historic use of drawing materials. Traditionally, conservators and curators have had to rely upon visual observation with multiple wavelengths of light and magnification to characterize the materials in drawings, a challenging task further...

Read More thumbnail image: Multivariate analysis of Raman spectra of carbonaceous black drawing media for the in situ identification of historic artist materials

Romantic restorations in the A lhambra monument: S pectroscopic characterization of decorative plasterwork in the R oyal B aths of C omares

Published: Jul 8, 2018

Author(s): Paz Arjonilla, María José Ayora‐Cañada, Ramón Rubio Domene, Elena Correa Gómez, María José Torre‐López, Ana Domínguez‐Vidal

Journal: Journal of Raman Spectroscopy

Abstract The polychrome plasterwork decorations of the Room of the Beds in the Royal Bath of Comares of the Alhambra monumental ensemble have been studied using Raman microspectroscopy and complementary techniques. This area keeps the testimony of the controversial restorations carried out in the 19th century in an attempt to imitate the lost original appearance of the authentic Nasrid plasterwork. Raman spectroscopy and energy...

Read More thumbnail image: Romantic restorations in the A lhambra monument S pectroscopic characterization of decorative plasterwork in the R oyal B aths of C omares

SERS and DFT study of 5F‐PB‐22

Published: Jul 8, 2018

Author(s): Mohammad Alkaseem, Mark Baron

Journal: Journal of Raman Spectroscopy

Abstract In this work, a joint experimental and theoretical study on the synthetic cannabinoid, 5F‐PB‐22 (1‐(5‐fluoropentyl)‐8‐quinolinyl ester‐1H‐indole‐3‐carboxylic acid) is reported. The molecular vibrations of 5F‐PB‐22 were investigated by Raman and surface‐enhanced Raman spectroscopy (SERS) spectroscopies. In parallel, quantum chemical calculations based on density functional theory (DFT) with the hybrid B3LYP...

Read More thumbnail image: SERS and DFT study of 5FPB22

Detection of erythropoiesis‐stimulating agents in a single dried blood spot

Published: Jul 5, 2018

Author(s): Gemma Reverter‐Branchat, Rosa Ventura, Mohammed Ezzel Din, Julián Mateus, Carme Pedro, Jordi Segura

Journal: Drug Testing and Analysis

Abstract The use of dried blood spots (DBS) for anti‐doping purposes would facilitate an increase in the number of blood samples because it eliminates the need for specialized personnel and involves minimal invasiveness, reduced costs, stability, and easy transportation and storage. Here, the electrophoretic methodology established by the World Anti‐Doping Agency (WADA) to detect erythropoiesis‐stimulating agents (ESAs) has been...

Read More thumbnail image: Detection of erythropoiesisstimulating agents in a single dried blood spot

Protective effects of timosaponin BII on oxidative stress damage in PC12 cells based on metabolomics

Published: Jul 5, 2018

Author(s): Qinmei Xie, Hongxia Zhao, Na Li, Li Su, Xu Xu, Zhanying Hong

Journal: Biomedical Chromatography

Abstract Peroxide and oxygen free radicals are some of the causes of oxidative stress in brain tissue, and could lead to the change of brain structure and function. In addition, oxidative damage is one of the most important causes of the aging of the vast majority of tissues. The aim of this study is to investigate the protective effect of timosaponin BII on oxidative stress damage of PC12 induced by H2O2 using metabolomics based on...

Read More thumbnail image: Protective effects of timosaponin BII on oxidative stress damage in PC12 cells based on metabolomics

Metabolic alterations in triptolide‐induced acute hepatotoxicity

Published: Jul 5, 2018

Author(s): Jie Zhao, Cen Xie, Xiyan Mu, Kristopher W. Krausz, Daxesh P. Patel, Xiaowei Shi, Xiaoxia Gao, Qiao Wang, Frank J. Gonzalez

Journal: Biomedical Chromatography

Abstract Triptolide, a major active constitute of Tripterygium wilfordii Hook. F, is prescribed for the treatment of autoimmune diseases in China. One of its most severe adverse effects observed in the clinical use is hepatotoxicity, but the mechanism is still unknown. Therefore, the present study applied an LC/MS‐based metabolomic analysis to characterize the metabolomic changes in serum and liver induced by triptolide in mice. Mice were...

Read More thumbnail image: Metabolic alterations in triptolideinduced acute hepatotoxicity

Impact of contrast agent injection duration on dynamic contrast‐enhanced MRI quantification in prostate cancer

Published: Jul 5, 2018

Author(s): Edzo M.E. Klawer, Petra J. Houdt, Floris J. Pos, Stijn W.T.P.J. Heijmink, Matthias J.P. Osch, Uulke A. Heide

Journal: NMR in Biomedicine

The volume transfer constant Ktrans, which describes the leakage of contrast agent (CA) from vasculature into tissue, is the most commonly reported quantitative parameter for dynamic contrast‐enhanced (DCE‐) MRI. However, the variation in reported Ktrans values between studies from different institutes is large. One of the primary sources of uncertainty is quantification of the arterial input function (AIF). The aim of this study is to determine the...

Read More thumbnail image: Impact of contrast agent injection duration on dynamic contrastenhanced MRI quantification in prostate cancer

Decoupling of a double‐row 16‐element tight‐fit transceiver phased array for human whole‐brain imaging at 9.4 T

Published: Jul 5, 2018

Author(s): Nikolai I. Avdievich, Ioannis A. Giapitzakis, Andreas Pfrommer, Gunamony Shajan, Klaus Scheffler, Anke Henning

Journal: NMR in Biomedicine

One of the major challenges in constructing multi‐channel and multi‐row transmit (Tx) or transceiver (TxRx) arrays is the decoupling of the array's loop elements. Overlapping of the surface loops allows the decoupling of adjacent elements and also helps to improve the radiofrequency field profile by increasing the penetration depth and eliminating voids between the loops. This also simplifies the design by reducing the number of...

Read More thumbnail image: Decoupling of a doublerow 16element tightfit transceiver phased array for human wholebrain imaging at 9_4 T

Ammonia‐weighted imaging by chemical exchange saturation transfer MRI at 3 T

Published: Jul 5, 2018

Author(s): Helge Jörn Zöllner, Markus Butz, Gerald Kircheis, Stefan Klinker, Dieter Häussinger, Benjamin Schmitt, Alfons Schnitzler, Hans‐Jörg Wittsack

Journal: NMR in Biomedicine

Hepatic encephalopathy (HE) is triggered by liver cirrhosis and is associated with an increased ammonia level within the brain tissue. The goal of this study was to investigate effects of ammonia on in vitro amide proton transfer (APT)‐weighted chemical exchange saturation transfer (CEST) imaging in order to develop an ammonia‐sensitive brain imaging method. APT‐weighted CEST imaging was performed on phantom solutions...

Read More thumbnail image: Ammoniaweighted imaging by chemical exchange saturation transfer MRI at 3T

Time‐resolved Raman spectroscopy for shock‐driven intramolecular electron redistribution of cyclotrimethylene trinitramine (RDX)

Published: Jul 5, 2018

Author(s): Guoyang Yu, Zhaoyang Zheng, Honglin Wu, Yangyang Zeng, Qiang Wu, Duowang Tan, Xianxu Zheng, Yunfei Song, Yanqiang Yang

Journal: Journal of Raman Spectroscopy

Abstract Shock‐driven intramolecular electron redistribution (IER) of cyclotrimethylene trinitramine (RDX) is proposed, which will be helpful for understanding the initiation and safety mechanisms of RDX materials under shock compressions. Laser‐driven shock wave was performed to generate a dynamic pressure, and time‐resolved Raman spectroscopy was used to probe the shock wave response of RDX. First‐principle calculations were...

Read More thumbnail image: Timeresolved Raman spectroscopy for shockdriven intramolecular electron redistribution of cyclotrimethylene trinitramine RDX

Surface characterisation of Escherichia coli under various conditions by near‐ambient pressure XPS

Published: Jul 5, 2018

Author(s): Marit Kjærvik, Karin Schwibbert, Paul Dietrich, Andreas Thissen, Wolfgang E. S. Unger

Journal: Surface and Interface Analysis

Bacteria are inherently in a hydrated state and therefore not compatible to ultra‐high vacuum techniques such as XPS without prior sample preparation involving freeze drying or fast freezing. This has changed with the development of near‐ambient pressure (NAP)‐XPS, which makes it possible to characterise the bacterial surface with minimal sample preparation. This paper presents NAP‐XPS measurements of Escherichia coli under various NAP...

Read More thumbnail image: Surface characterisation of Escherichia coli under various conditions by nearambient pressure XPS

Open‐tubular capillary electrochromatographic determination of ten sulfonamides in tap water and milk by a metal‐organic framework‐coated capillary column

Published: Jul 4, 2018

Author(s): Xuan Wang, Nengsheng Ye, Xiaoyu Hu, Qingye Liu, Jian Li, Lin Peng, Xiaotong Ma

Journal: ELECTROPHORESIS

Abstract In this study, a metal‐organic framework (MOF), [Mn(cam)(bpy)], was synthesized and characterized by thermogravimetric analysis, scanning electron microscopy, and Fourier transform infrared spectrometry. An open‐tubular capillary column was fabricated from [Mn(cam)(bpy)] via the amide coupling method. Ten types of sulfonamides were separated through the fabricated capillary column, which showed a good limits of detection (...

Read More thumbnail image: Opentubular capillary electrochromatographic determination of ten sulfonamides in tap water and milk by a metalorganic frameworkcoated capillary column

Carbon molecular sieve based micro‐matrix‐solid‐phase dispersion for the extraction of polyphenols in pomegranate peel by UHPLC‐Q‐TOF/MS

Published: Jul 4, 2018

Author(s): Li‐Jing Du, Jian‐Ping Huang, Bin Wang, Chen‐Hui Wang, Qiu‐Yan Wang, Yu‐Han Hu, Ling Yi, Jun Cao, Li‐Qing Peng, Yu‐Bo Chen, Qi‐Dong Zhang

Journal: ELECTROPHORESIS

Abstract A rapid, simple, and efficient sample extraction method based on micro‐matrix‐solid‐phase dispersion (micro‐MSPD) was applied to the extraction of polyphenols from pomegranate peel. Five target analytes were determined by ultra‐HPLC coupled with Q‐TOF/MS. Carbon molecular sieve (CMS) was firstly used as dispersant to improve extraction efficiency in micro‐MSPD. The major micro‐MSPD parameters, such as type of dispersant,...

Read More thumbnail image: Carbon molecular sieve based micromatrixsolidphase dispersion for the extraction of polyphenols in pomegranate peel by UHPLCQTOFMS

An optimized microfluidic paper‐based NiOOH/Zn alkaline battery

Published: Jul 4, 2018

Author(s): Samantha Burrola, Maria Jose Gonzalez‐Guerrero, Ani Avoundjian, Frank A. Gomez

Journal: ELECTROPHORESIS

Abstract In this paper, an alkaline nickel oxide hydroxide/zinc (NiOOH/Zn) battery featuring a cellulose matrix separator between electrodes is presented. The metallic electrodes and the paper separator are inserted in a layer‐by‐layer assembly that provides mechanical stability to the system resulting in a lightweight and easy‐to‐use device. The battery was optimized for the amount of NiOOH‐ink used at the cathode (11.1 mg/cm2) and...

Read More thumbnail image: An optimized microfluidic paperbased NiOOHZn alkaline battery

Complementarity of electrophoretic, mass spectrometric, and gene sequencing techniques for the diagnosis and characterization of congenital disorders of glycosylation

Published: Jul 4, 2018

Author(s): Arnaud Bruneel, Sophie Cholet, Valérie Drouin‐Garraud, Marie‐Line Jacquemont, Aline Cano, André Mégarbané, Coralie Ruel, David Cheillan, Thierry Dupré, Sandrine Vuillaumier‐Barrot, Nathalie Seta, François Fenaille

Journal: ELECTROPHORESIS

Abstract Congenital disorders of glycosylation (CDG) are rare autosomal genetic diseases affecting the glycosylation of proteins and lipids. Since CDG‐related clinical symptoms are classically extremely variable and nonspecific, a combination of electrophoretic, mass spectrometric, and gene sequencing techniques is often mandatory for obtaining a definitive CDG diagnosis, as well as identifying causative gene mutations and...

Read More thumbnail image: Complementarity of electrophoretic mass spectrometric and gene sequencing techniques for the diagnosis and characterization of congenital disorders of glycosylation
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