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Charge state tailoring of relativistic heavy ion beams for the Gamma Factory project at CERN

Published: May 29, 2019

Author(s): F.M. Kröger, G. Weber, V.P. Shevelko, S. Hirlaender, M.W. Krasny, Th. Stöhlker

Journal: X-Ray Spectrometry

We present charge‐state evolution studies for Pb54+ ion beams passing through stripper foils at relativistic energies of 5.9 GeV/u. The purpose of this investigation is to determine the optimum target material and non‐equilibrium thickness for the efficient production of few‐electron lead ions, that is, Pb80+ and Pb81+, at the present European Organization for Nuclear Research, CERN, accelerator facility at energies as high as 5.9 GeV/u. Based on these predictions, an Al stripper foil has been...

Read More thumbnail image: Charge state tailoring of relativistic heavy ion beams for the Gamma Factory project at CERN

Simultaneous determination of evobrutinib and its metabolite evobrutinib‐diol in dog plasma by liquid chromatography combined with electrospray ionization tandem mass spectrometry

Published: May 29, 2019

Author(s): Jie Yang, Haiyang Yu, Qingmeng Tang

Journal: Biomedical Chromatography

Abstract A rapid and sensitive liquid chromatography hyphenated with electrospray ionization tandem mass spectrometric method (LC–ESI–MS/MS) was developed and validated for simultaneous determination of evobrutinib and evobrutinib‐diol in dog plasma. The plasma sample was processed using acetonitrile and chromatographic separation was carried out on a Waters Acquity BEH C18 column (50 × 2.1 mm, 1.7 μm). The mobile phase was composed of 0.1% formic acid and acetonitrile, with an optimized...

Read More thumbnail image: Simultaneous determination of evobrutinib and its metabolite evobrutinibdiol in dog plasma by liquid chromatography combined with electrospray ionization tandem mass spectrometry

Development of air‐assisted dispersive micro‐solid‐phase extraction‐based supramolecular solvent‐mediated Fe3O4@Cu–Fe–LDH for the determination of tramadol in biological samples

Published: May 29, 2019

Author(s): Maryam Ezoddin, Laleh Adlnasab, Akram Afshari Kaveh, Mohammad Ali Karimi, Behnaz Mahjoob

Journal: Biomedical Chromatography

Abstract A simple method, air‐assisted dispersive micro‐solid‐phase extraction‐based supramolecular solvent was developed for the preconcentration of tramadol in biological samples prior to gas chromatography–flame ionization detection. A new type of carrier liquid, supramolecular solvent based on a mixture of 1‐dodecanol and tetrahydrofuran was combined with layered double hydroxide coated on a magnetic nanoparticle (Fe3O4@SiO2@Cu–Fe–LDH). The supramolecular solvent was injected into the...

Read More thumbnail image: Development of airassisted dispersive microsolidphase extractionbased supramolecular solventmediated Fe3O4CuFeLDH for the determination of tramadol in biological samples

A fresh look into background electrolyte selection for capillary electrophoresis‐laser induced fluorescence of peptides and proteins

Published: May 29, 2019

Author(s): Marco Morani, Myriam Taverna, Thanh Duc Mai

Journal: ELECTROPHORESIS

Abstract This study reports a reinvestigation of background electrolyte selection strategy for performance improvement in CE‐LIF of peptides and proteins. This strategy is based on the employment of high concentrations of organic species in BGE possessing high buffer capacity and low specific conductivity in order to ensure excellent stacking preconcentration and separation resolution of fluorescently tagged peptides and proteins. Unlike universal UV detection, the use of such BGEs at high...

Read More thumbnail image: A fresh look into background electrolyte selection for capillary electrophoresislaser induced fluorescence of peptides and proteins

Investigation of deep eutectic solvents as additives to β‐CD for enantiomeric separations of Zopiclone, Salbutamol, and Amlodipine by CE

Published: May 29, 2019

Author(s): Yi Mu, Xi Wu, Yan‐Ping Huang, Zhao‐Sheng Liu

Journal: ELECTROPHORESIS

Abstract The enantioseparation of chiral drugs via CE was first investigated using β‐CD as chiral additive and deep eutectic solvents (DESs) as auxiliary additive. The results showed that improved separation of tested chiral drugs was obtained in the presence of DESs and β‐CD compared to the single β‐CD separation system. With the optimized condition, resolutions of DESs applied β‐CD separation system for rac‐Zopiclone, rac‐Salbutamol, and rac‐Amlodipine increased 3–4.2 times as single β‐CD...

Read More thumbnail image: Investigation of deep eutectic solvents as additives to CD for enantiomeric separations of Zopiclone Salbutamol and Amlodipine by CE

Graphene quantum dots for enhancement of fluorimetric detection coupled to capillary electrophoresis for detection of ofloxacin

Published: May 29, 2019

Author(s): Samah Lahouidak, M. Laura Soriano, Rachid Salghi, Mohammed Zougagh, Ángel Ríos

Journal: ELECTROPHORESIS

Abstract A new CE method with fluorescence detection is reported on the determination of ofloxacin in milk samples using graphene quantum dots (GQDs) for sensitivity enhancement. Injection of GQDs prior the standards/sample is crucial to increase the antibiotic fluorescence response. Clean‐up and preconcentration steps allowed for a good linear correlation in a concentration range between 50 and 1000 ng/mL for the ofloxacin, detection and quantification limits being 10.7 and 35.5 ng/mL,...

Read More thumbnail image: Graphene quantum dots for enhancement of fluorimetric detection coupled to capillary electrophoresis for detection of ofloxacin

Raman study of amorphization in nanocrystalline 3C–SiC irradiated with C+ and He+ ions

Published: May 29, 2019

Author(s): Limin Zhang, Weilin Jiang, Chenglong Pan, Raul C. Fadanelli, Wensi Ai, Liang Chen, Tieshan Wang

Journal: Journal of Raman Spectroscopy

Abstract This study examines C+ and He+ ion irradiation‐induced amorphization processes in 3C–SiC nanograins embedded in an amorphous SiC matrix. Raman spectroscopy and Rutherford backscattering spectrometry are used for damage characterization. SiC grains with an average size of either ~6 or ~20 nm were observed to be fully amorphized to a lower dose at room temperature compared with their monocrystalline counterpart under the identical irradiation condition. In addition to damage...

Read More thumbnail image: Raman study of amorphization in nanocrystalline 3CSiC irradiated with C and He ions

A rapid and efficient extraction method based on industrial MCM‐41‐miniaturized matrix solid‐phase dispersion extraction with response surface methodology for simultaneous quantification of six flavonoids in Pollen typhae by ultra‐high‐performance liquid chromatography

Published: May 28, 2019

Author(s): Xiaoyan Wang, Jin Li, Xuejing Yang, Xiu‐mei Gao, Hui Wang, Yan‐xu Chang

Journal: Journal of Separation Science

Abstract An industrial MCM‐41‐miniaturized matrix solid‐phase dispersion extraction coupled with response surface methodology was explored to determine L‐epicatechin, typhaneoside, isorhamnetin‐3‐O‐neohespeidoside, naringenin, kaempferol, and isorhamnetin in Pollen typhae by ultra‐high performance liquid chromatography connected to a photodiode array detection. Several variables were optimized in detail, including mesh number of sieve, type of adsorbent, mass ratio of sample to adsorbent,...

Read More thumbnail image: A rapid and efficient extraction method based on industrial MCM41miniaturized matrix solidphase dispersion extraction with response surface methodology for simultaneous quantification of six flavonoids in Pollen typhae by ultrahighperformance liquid chromatography

System for coincidence measurements of the ions desorbed and projectiles scattered from noble gas solid surfaces by slow multiply charged ion impacts

Published: May 28, 2019

Author(s): Hiroyoshi Sawa, Shuntaro Uchida, Hirokazu Ueta, Takato Hirayama

Journal: X-Ray Spectrometry

We have developed a new experimental apparatus for performing coincidence measurements of the ions desorbed and projectiles scattered from the surfaces of noble gas solids by slow multiply charged ion impacts at grazing incidence angles. This simultaneously measures the desorbed ions' flight times and the scattered projectiles' charge states. We also conduct experiments on 6 keV Ar6+ impacts onto a solid Ne surface using the device.

Read More thumbnail image: System for coincidence measurements of the ions desorbed and projectiles scattered from noble gas solid surfaces by slow multiply charged ion impacts

Raman mapping of 4‐MeV C and Si channeling implantation of 6H‐SiC

Published: May 27, 2019

Author(s): Aikaterini Flessa, Eleni Ntemou, Michael Kokkoris, Efthymios Liarokapis, Marko Gloginjić, Srdjan Petrović, Marko Erich, Stjepko Fazinić, Marko Karlušić, Kristina Tomić

Journal: Journal of Raman Spectroscopy

Abstract A 6H‐SiC single crystal implanted in channeling mode by 4‐MeV C+3 and Si+3 ions at various doping levels has been examined by scanning electron microscopy (SEM) and micro‐Raman spectroscopy in order to study the lattice distortions inflicted by the impinging ions. C ions create zones of strongly damaged regions, parallel to the front face of the wafer with width increasing with the amount of doping. As expected, Si has induced considerably more lattice distortions than C, and more...

Read More thumbnail image: Raman mapping of 4MeV C and Si channeling implantation of 6HSiC

Detection of glioma by surface‐enhanced Raman scattering spectra with optimized mathematical methods

Published: May 27, 2019

Author(s): Jiaojiao Sun, Hao Fang, Zhiqiang Zhang, Mingli Chen, Jingjing Tian, Liang Chen, Xiang Zou, Huancai Yin, Jian Yin

Journal: Journal of Raman Spectroscopy

Abstract This work aimed to establish a fast and accurate method to detect glioma by combining surface‐enhanced Raman scattering (SERS) and mathematical analysis. At first, 785‐nm laser was selected as the optimum laser to acquire Raman spectra of human brain tissue. Second, it was verified that Raman data in the range of 1,200–1,600 cm−1 could improve the performance of classifier. Based on the analytical results of 1,200–1,600 cm−1 data, the sensitivity and specificity of partial least...

Read More thumbnail image: Detection of glioma by surfaceenhanced Raman scattering spectra with optimized mathematical methods

Temperature‐induced phonon behavior in titanium disulfide (TiS2) nanosheets

Published: May 27, 2019

Author(s): A. Dużyńska, J. Judek, K. Wilczyński, K. Zberecki, A. Łapińska, A. Wróblewska, M. Zdrojek

Journal: Journal of Raman Spectroscopy

Abstract A detailed study of temperature‐dependent phonon properties of exfoliated titanium disulphide (TiS2) nanosheets probed by Raman spectroscopy in the 80‐ to 450‐K temperature range is reported here. The TiS2 Raman mode (Eg, A1g, and Sh) positions exhibit linear shift dependences; however, in contradiction to typical behavior, the Sh mode surprisingly exhibits positive first‐order temperature coefficient (χ=0.0592 cm‐1/K) with increase of the temperature. In addition, the widths of...

Read More thumbnail image: Temperatureinduced phonon behavior in titanium disulfide TiS2 nanosheets

Rapid determination of trace nitrofurantoin in cosmetics by surface enhanced Raman spectroscopy using nanoarrayed hydroxyl polystyrene‐based substrate

Published: May 27, 2019

Author(s): Yi Zhang, Zhongning Yu, Zhenfeng Yue, Jiamin Gao, Shaojing Wu, Zhuomin Zhang, Gongke Li

Journal: Journal of Raman Spectroscopy

Abstract The safety of cosmetics attributing to the illegal addition of antibiotics for quick effect is a big concern nowadays. Nitrofurans, one of commonly added illegal antibiotics, are strictly banned in cosmetics in China. It is still a great challenge for the rapid and precise analysis of trace nitrofurans when facing various cosmetics with complicated matrices. Surface‐enhanced Raman spectroscopy (SERS) is emerging as a novel rapid on‐site analytical technique. In this work, an accurate...

Read More thumbnail image: Rapid determination of trace nitrofurantoin in cosmetics by surface enhanced Raman spectroscopy using nanoarrayed hydroxyl polystyrenebased substrate

Rapid determination of trace nitrofurantoin in cosmetics by surface enhanced Raman spectroscopy using nanoarrayed hydroxyl polystyrene‐based substrate

Published: May 27, 2019

Author(s): Yi Zhang, Zhongning Yu, Zhenfeng Yue, Jiamin Gao, Shaojing Wu, Zhuomin Zhang, Gongke Li

Journal: Journal of Raman Spectroscopy

Abstract The safety of cosmetics attributing to the illegal addition of antibiotics for quick effect is a big concern nowadays. Nitrofurans, one of commonly added illegal antibiotics, are strictly banned in cosmetics in China. It is still a great challenge for the rapid and precise analysis of trace nitrofurans when facing various cosmetics with complicated matrices. Surface‐enhanced Raman spectroscopy (SERS) is emerging as a novel rapid on‐site analytical technique. In this work, an accurate...

Read More thumbnail image: Rapid determination of trace nitrofurantoin in cosmetics by surface enhanced Raman spectroscopy using nanoarrayed hydroxyl polystyrenebased substrate

Preparative and scaled‐up separation of high‐purity α‐linolenic acid from perilla seed oil by conventional and pH‐zone refining counter current chromatography

Published: May 27, 2019

Author(s): Tian Han, Guang Yang, Xueli Cao, Haoze Li, Hairun Pei, Zhijun Zhang

Journal: Journal of Separation Science

Abstract α‐Linolenic acid is an essential omega‐3 fatty acid needed for human health. However, the isolation of high‐purity α‐linolenic acid from plant resources is challenging. The preparative separation methods of α‐linolenic acid by both conventional and pH‐zone refining counter current chromatography were firstly established in this work. The successful separation of α‐linolenic acid by conventional counter current chromatography was achieved by the optimized solvent system...

Read More thumbnail image: Preparative and scaledup separation of highpurity linolenic acid from perilla seed oil by conventional and pHzone refining countercurrent chromatography

Yttria‐based sol–gel coating for capillary microextraction online coupled to high‐performance liquid chromatography

Published: May 27, 2019

Author(s): Shehzada Muhammad Sajid Jillani, Khalid Alhooshani

Journal: Journal of Separation Science

Abstract This work about the development of yttria‐based polymeric coating using [bis(hydroxyethyl) amine] terminated polydimethylsiloxanes and yttrium trimethoxyethoxide inside the capillary. The coated capillary was utilized for online capillary microextraction and high‐performance liquid chromatography analysis. The prepared coating material was characterized using scanning electron microscopy, X‐ray photoelectron spectroscopy, energy dispersive X‐ray spectrometry, and thermogravimetric...

Read More thumbnail image: Yttriabased solgel coating for capillary microextraction online coupled to highperformance liquid chromatography

Fabric phase sorptive extraction/GC‐MS method for rapid determination of broad polarity spectrum multi‐class emerging pollutants in various aqueous samples

Published: May 27, 2019

Author(s): Ramandeep Kaur, Ripneel Kaur, Aman Grover, Susheela Rani, Ashok Kumar Malik, Abuzar Kabir, Kenneth G. Furton

Journal: Journal of Separation Science

Abstract A rapid extraction and cleanup method using selective fabric phase sorptive extraction combined with gas chromatography and mass spectrometry has been developed and validated for the determination of broad polarity spectrum emerging pollutants, ethyl paraben, butyl paraben, diethyl phthalate, dibutyl phthalate, lidocaine, prilocaine, triclosan, and bisphenol A in various aqueous samples. Some important parameters of fabric phase sorptive extraction such as extraction time, matrix pH,...

Read More thumbnail image: Fabric phase sorptive extractionGCMS method for rapid determination of broad polarity spectrum multiclass emerging pollutants in various aqueous samples

Microfunnel‐filter‐based emulsification microextraction followed by gas chromatography for simple determination of organophosphorus pesticides in environmental water samples

Published: May 27, 2019

Author(s): Mitra Talaee, Bahareh Lorestani, Majid Ramezani, Mehrdad Cheraghi, Saeed Jamehbozorgi

Journal: Journal of Separation Science

Abstract A simple and fast method named microfunnel‐filter‐based emulsification microextraction is introduced for an efficient determination of some organophosphorus pesticides including diazinon, malathion, and chlorpyrifos in the environmental samples including the river, sea, and well water. This method is based upon the dispersion of a low‐toxicity organic solvent (dihexyl ether), as the extractant, in a high volume of an aqueous sample solution (45 mL). It is implemented without a...

Read More thumbnail image: Microfunnelfilterbased emulsification microextraction followed by gas chromatography for simple determination of organophosphorus pesticides in environmental water samples

Studies on oral bioavailability and first‐pass metabolism of withaferin A in rats using LC–MS/MS and Q‐TRAP

Published: May 26, 2019

Author(s): Tianming Dai, Weifan Jiang, Zizheng Guo, Zhenyu Wang, Mingping Huang, Guorui Zhong, Chuxin Liang, Xuzhe Pei, Renke Dai

Journal: Biomedical Chromatography

Abstract Withaferin A (WA) is one of the major bioactive steroidal lactones with extensive pharmacological activities present in the plant Withania somnifera. The absolute oral bioavailability of WA remains unknown and human‐related in vitro data are not available. Therefore, in the present study, the absolute oral bioavailability of WA in male rats and the in vitro screening of absorption factors by Q‐trap and LC–MS/MS analysis were conducted to explore possible clinical properties of WA. The...

Read More thumbnail image: Studies on oral bioavailability and firstpass metabolism of withaferin A in rats using LCMSMS and QTRAP

Identification and structural characterization of febuxostat metabolites in rat serum and urine samples using UHPLC–QTOF/MS

Published: May 26, 2019

Author(s): Liping Zhou, Hexiang Liu, Zhongyong Xu, Su Guan, Lei Zhang

Journal: Biomedical Chromatography

Abstract Febuxostat is a novel nonpurine type of highly selective xanthine oxidoreductase inhibitor. A rapid and sensitive ultra‐high‐performance liquid chromatography–quadrupole time‐of‐flight mass spectrometry method for simultaneous separation and determination of febuxostat and its metabolites in rat serum and urine was developed at various time points after oral administration to the rats. The febuxostat metabolites were predicted by biotransformation software and transformed to a...

Read More thumbnail image: Identification and structural characterization of febuxostat metabolites in rat serum and urine samples using UHPLCQTOFMS
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