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Analysis of trace levels of impurities and hydrogen isotopes in helium purge gas using gas chromatography for tritium extraction system of an Indian lead lithium ceramic breeder test blanket module

Published: Feb 6, 2018

Author(s): V. Gayathri Devi, Amit Sircar, Deepak Yadav, Jayraj Parmar

Journal: Journal of Separation Science

Abstract In the fusion fuel cycle, the accurate analysis and understanding of the chemical composition of any gas mixture is of great importance for the efficient design of a tritium extraction and purification system or any tritium handling system. Methods like laser Raman spectroscopy and gas chromatography with thermal conductivity detector have been considered for hydrogen isotopes analyses in fuel cycles. Gas chromatography...

Read More thumbnail image: Analysis of trace levels of impurities and hydrogen isotopes in helium purge gas using gas chromatography for tritium extraction system of an Indian lead lithium ceramic breeder test blanket module

Rapid characterization of chlorogenic acids in Duhaldea nervosa based on ultra‐high‐performance liquid chromatography–linear trap quadropole‐Orbitrap‐mass spectrometry and mass spectral trees similarity filter technique

Published: Feb 6, 2018

Author(s): Lianghong Liu, Jiayu Zhang, Binjie Zheng, Ying Guan, Liting Wang, Lei Chen, Wei Cai

Journal: Journal of Separation Science

Abstract Duhaldea nervosa (Wallich ex Candolle) A. Anderberg has been traditionally used as a food spice and also in folk medicine for treating traumatic injury and relieving rheumatism, especially accelerating the healing of a fracture. However, so far as we are aware, the chemical constituents have not been fully investigated. In this study, a practical method of mass spectral trees similarity filter, a data‐mining technique, was...

Read More thumbnail image: Rapid characterization of chlorogenic acids in Duhaldea nervosa based on ultrahighperformance liquid chromatographylinear trap quadropoleOrbitrapmass spectrometry and mass spectral trees similarity filter technique

Ionic liquid chemically bonded basalt fibers for in‐tube solid‐phase microextraction

Published: Feb 6, 2018

Author(s): Juanjuan Feng, Huijun Mao, Xiuqin Wang, Yu Tian, Chuannan Luo, Min Sun

Journal: Journal of Separation Science

Abstract Ionic liquids have been widely used in different fields by advantage of their specific properties. In this work, 1‐methyl‐3‐(3‐trimethoxysilyl propyl)imidazolium chloride was prepared and chemically bonded onto basalt fibers for in‐tube solid‐phase microextraction. Through combining in‐tube extraction device with high‐performance liquid chromatography equipped with a diode array detector, an online enrichment and analysis...

Read More thumbnail image: Ionic liquid chemically bonded basalt fibers for intube solidphase microextraction

Determination of synephrine in feeds by a novel quick, easy, cheap, effective, rugged, and safe solid‐phase extraction method combined with UHPLC–MS/MS

Published: Feb 6, 2018

Author(s): Yue Song, Tingting Chai, Shengting Lou, Yuechen Zhao, Xining Zhang, Shuming Yang, Yongzhong Qian, Jing Qiu

Journal: Journal of Separation Science

Abstract To detect and quantify synephrine in feed, an effective analytical method based on quick, easy, cheap, effective, rugged, and safe solid‐phase extraction coupled to ultra high performance liquid chromatography with tandem mass spectrometry was developed with isotopic internal standards. Pretreatment was performed using quick, easy, cheap, effective, rugged, and safe solid‐phase extraction with primary secondary amine and...

Read More thumbnail image: Determination of synephrine in feeds by a novel quick easy cheap effective rugged and safe solidphase extraction method combined with UHPLCMSMS

Identification of oxymorphone as decomposition product of the permitted drug methylnaltrexone

Published: Feb 6, 2018

Author(s): T. Sobolevsky, Y. Kucherova, B. Ahrens

Journal: Drug Testing and Analysis

Read More thumbnail image: Identification of oxymorphone as decomposition product of the permitted drug methylnaltrexone

Effect of glucocorticoid administration on the steroid profile

Published: Feb 6, 2018

Author(s): Sergi Coll, Xavier Matabosch, Lorena Garrostas, Clara Perez‐Maña, Rosa Ventura

Journal: Drug Testing and Analysis

Abstract The steroid profile (SP) is a powerful tool to detect the misuse of endogenous anabolic androgenic steroids in sports, and it is included in the Athlete Biological Passport (ABP). Glucocorticoids (GCs), which are widely prescribed in sports and only prohibited in competition by systemic routes, inhibit the hypothalamic‐pituitary‐adrenal axis. Since the metabolites monitored in the SP have a partial adrenal origin, their...

Read More thumbnail image: Effect of glucocorticoid administration on the steroid profile

Seriation, the method out of a chemist's mind

Published: Feb 6, 2018

Author(s): Gergely Tóth, Sasan Amari‐Amir

Journal: Journal of Chemometrics

Abstract Seriation is the practice of performing row and column permutations on data matrices to reveal clusters and hidden patterns within and between them. Seriation has been a known problem to tackle in the literature for over a century except chemical data where there are a fewer than a handful of researchers who have knowingly worked on this technique. The aim of this paper is to give seriation examples on chemical data and to...

Read More thumbnail image: Seriation the method out of a chemists mind

Resonant broadband stimulated Raman scattering in myoglobin

Published: Feb 6, 2018

Author(s): C. Ferrante, G. Batignani, G. Fumero, E. Pontecorvo, A. Virga, L. C. Montemiglio, G. Cerullo, M. H. Vos, T. Scopigno

Journal: Journal of Raman Spectroscopy

Abstract Spontaneous Raman is a well‐established tool to probe molecular vibrations. Under resonant conditions, it is a largely used method for characterizing the structure of heme‐proteins. In recent years, advances in pulsed laser sources allowed to explore vibrational features with complex techniques based on nonlinear optical interactions, among which is stimulated Raman scattering (SRS). Building on its combined...

Read More thumbnail image: Resonant broadband stimulated Raman scattering in myoglobin

On the SERS quantitative determination of organic dyes

Published: Feb 6, 2018

Author(s): Marilena Ricci, Elisa Trombetta, Emilio Castellucci, Maurizio Becucci

Journal: Journal of Raman Spectroscopy

Abstract The use of surface‐enhanced Raman scattering methods for the quantitative determination of different molecular species is not trivial as many parameters seriously affect the outcome of any experiment. In this work, we use as a case study the quantitative analysis of ionic organics dyes. We report on the role of different molecular properties to the modulation of the surface‐enhanced Raman scattering signal, the useful...

Read More thumbnail image: On the SERS quantitative determination of organic dyes

A validated liquid chromatography‐high resolution‐tandem mass spectrometry method for the simultaneous quantitation of tryptophan, kynurenine, kynurenic acid, and quinolinic acid in human plasma

Published: Feb 5, 2018

Author(s): Kathrin Arnhard, Florian Pitterl, Barbara Sperner‐Unterweger, Dietmar Fuchs, Therese Koal, Herbert Oberacher

Journal: ELECTROPHORESIS

Abstract Tryptophan (TRP) catabolism via the kynurenine pathway is considered to represent a major link between inflammation and various diseases, including neurodegenerative disorders, depression, schizophrenia, multiple sclerosis, cardiovascular disease, and cancer. The kynurenine pathway and levels of TRP and its metabolites kynurenine (KYN), kynurenic acid (KYNA) and quinolinic acid (QUIN) are well regulated under physiological...

Read More thumbnail image: A validated liquid chromatographyhigh resolutiontandem mass spectrometry method for the simultaneous quantitation of tryptophan kynurenine kynurenic acid and quinolinic acid in human plasma

Determination of isoorientin levels in rat plasma after oral administration of Vaccinum bracteatum Thunb. methanol extract by high‐performance liquid chromatography‐tandem mass spectrometry

Published: Feb 2, 2018

Author(s): Min‐Ji Kim, Seung‐Hwan Kwon, Choon‐Gon Jang, Han‐Joo Maeng

Journal: Biomedical Chromatography

Abstract A simple, sensitive and rapid liquid chromatography tandem mass spectrometry method (LC‐MS/MS) was developed and validated for the determination of plasma isoorientin levels in rats. After simple protein precipitation using methanol, chromatographic analysis was performed using a Synergi 4μ polar‐RP 80A column (150 × 2.0 mm, 4μm) under isocratic conditions and a mobile phase consisting of 0.1% formic acid in water and...

Read More thumbnail image: Determination of isoorientin levels in rat plasma after oral administration of Vaccinum bracteatum Thunb_ methanol extract by highperformance liquid chromatographytandem mass spectrometry

External RBS analysis setup at U niversity of G öttingen: RBS analysis for liquid samples

Published: Feb 2, 2018

Author(s): M. Saito, K. Holm, F. L. Bregolin, H. Hofsäss

Journal: Surface and Interface Analysis

In this work, we describe new developments in the external analysis setup at University of Göttingen. The aim of this work is to expand the ability of the setup for performing Rutherford backscattering spectrometry (RBS) in atmospheric condition. This work presents the detail of the developed device for external RBS, as well as the initial result of RBS analysis for a volatile liquid sample. We also made an electrochemical cell with a...

Read More thumbnail image: External RBS analysis setup at U niversity of G ottingen RBS analysis for liquid samples

All‐dielectric core/shell resonators: From plasmon‐free SERS to multimodal analysis

Published: Feb 2, 2018

Author(s): Nicolò Bontempi, Irene Vassalini, Ivano Alessandri

Journal: Journal of Raman Spectroscopy

Abstract All‐dielectric materials are emerging as a new class of substrates for enhanced Raman scattering. As ohmic losses are reduced in the absence of plasmonic metals, Raman data obtained with dielectrics are very reproducible and reliable. This mini‐review summarizes our recent work in the field of core/shell dielectric resonators designed for Raman purposes, with a special focus on SiO2/TiO2 (T‐rex) core/shell beads. These...

Read More thumbnail image: Alldielectric coreshell resonators From plasmonfree SERS to multimodal analysis

Simultaneous analysis of oral anticancer drugs for renal cell carcinoma in human plasma using liquid chromatography/electrospray ionization tandem mass spectrometry

Published: Feb 1, 2018

Author(s): Shinya Takasaki, Masaki Tanaka, Masafumi Kikuchi, Masamitsu Maekawa, Yoshihide Kawasaki, Akihiro Ito, Yoichi Arai, Hiroaki Yamaguchi, Nariyasu Mano

Journal: Biomedical Chromatography

Abstract An analytical method using high‐performance liquid chromatography/electrospray ionization tandem mass spectrometry has been developed and validated for simultaneous measurement of four tyrosine kinase inhibitors used for renal cell carcinoma and their metabolites in human plasma. Despite their similar structures, it is difficult to measure plasma levels of these compounds simultaneously using optimal MS parameters for each...

Read More thumbnail image: Simultaneous analysis of oral anticancer drugs for renal cell carcinoma in human plasma using liquid chromatographyelectrospray ionization tandem mass spectrometry

Comparison between core–shell and totally porous particle stationary phases for fast and green LC determination of five hepatitis‐C antiviral drugs

Published: Feb 1, 2018

Author(s): Adel Ehab Ibrahim, Hisham Hashem, Magda Elhenawee, Hanaa Saleh

Journal: Journal of Separation Science

Abstract The performances of core–shell 2.7 μm and fully porous sub‐2 μm particles packed in narrow diameter columns were compared under the same chromatographic conditions. The stationary phases were compared for fast separation and determination of five new antiviral drugs; daclatasvir, sofosbuvir, velpatasvir, simeprevir, and ledipasvir. The gradient elution was done using ethanol as green organic modifier, which is...

Read More thumbnail image: Comparison between coreshell and totally porous particle stationary phases for fast and green LC determination of five hepatitisC antiviral drugs

A novel ranking distance measure combining Cayley and Spearman footrule metrics

Published: Feb 1, 2018

Author(s): László Sipos, Attila Gere, József Popp, Sándor Kovács

Journal: Journal of Chemometrics

Abstract Defining the appropriate ranking distance measures among rankings is a classic area of study. The goal of our work is to identify a combination of methodologies, which is proven to be capable for the determination of a proper ranking system. In our study, we used 3 well‐established metrics: Kendall tau, Spearman footrule, and Cayley distance and a novel metric created by the combination of Cayley and Spearman footrule...

Read More thumbnail image: A novel ranking distance measure combining Cayley and Spearman footrule metrics

Ensemble learning model based on selected diverse principal component analysis models for process monitoring

Published: Feb 1, 2018

Author(s): Zhichao Li, Xuefeng Yan

Journal: Journal of Chemometrics

Abstract Principal component analysis (PCA) is extensively applied in industrial process monitoring. For optimal performance monitoring, different faults may require different principal components (PCs). However, at present, it only selects PCs of the highest variance to create a single PCA model, thereby leading to information loss and poor monitoring performance. For the solution of this problem, a method based on ensemble...

Read More thumbnail image: Ensemble learning model based on selected diverse principal component analysis models for process monitoring

Linear discriminant analysis, partial least squares discriminant analysis, and soft independent modeling of class analogy of experimental and simulated near‐infrared spectra of a cultivation medium for mammalian cells

Published: Feb 1, 2018

Author(s): Éva Szabó, Szilveszter Gergely, András Salgó

Journal: Journal of Chemometrics

Abstract Currently, the qualification and control of medium formulations are performed based on simple methods (eg, pH and osmolality measurement of medium solutions), expensive and time‐consuming cell culture tests, and the quantification of certain critical compounds by liquid chromatography. In addition to traditional medium qualification tools, relatively new spectroscopic techniques, such as fluorescence spectroscopy, nuclear...

Read More thumbnail image: Linear discriminant analysis partial least squares discriminant analysis and soft independent modeling of class analogy of experimental and simulated nearinfrared spectra of a cultivation medium for mammalian cells

Spectral clustering in eye‐movement researches

Published: Feb 1, 2018

Author(s): Attila Gere, Sándor Kovács, László Sipos

Journal: Journal of Chemometrics

Abstract Eye tracking is a widely used technology to capture the eye movements of participants completing different tasks. Several eye‐tracking parameters are measured, which later can be used to characterize the gazing pattern of the individuals. Clustering based on the path walked on by the participants may enable the researchers to create clusters based on the unconscious personality and thinking style. Common clustering methods...

Read More thumbnail image: Spectral clustering in eyemovement researches

HPLC–MS/MS determination of flavonoids in Gleditsiae Spina for its quality assessment

Published: Feb 1, 2018

Author(s): Jing Li, Kun Jiang, Li‐Jun Wang, Guo Yin, Jue Wang, Yang Wang, Yi‐Bao Jin, Qing Li, Tie‐Jie Wang

Journal: Journal of Separation Science

Abstract Gleditsiae Spina, the thorn of Gleditsia sinensis Lam., has been used as an anti‐inflammatory, anti‐tumor, and anti‐bacterial traditional medicine for hundreds of years in China. This study used high‐performance liquid chromatography and tandem mass spectrometry combined with chemometric methods to allow the fast and accurate identification and quantification of the flavonoids compounds in Gleditsiae Spina, and created ...

Read More thumbnail image: HPLCMSMS determination of flavonoids in Gleditsiae Spina for its quality assessment
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