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Exploring the enantiorecognition mechanism of Cinchona alkaloid‐based zwitterionic chiral stationary phases and the basic trans ‐paroxetine enantiomers

Published: Dec 27, 2017

Author(s): Roccaldo Sardella, Antonio Macchiarulo, Fabrizio Urbinati, Federica Ianni, Andrea Carotti, Michal Kohout, Wolfgang Lindner, Antal Péter, István Ilisz

Journal: Journal of Separation Science

Abstract The enantiomers of trans‐paroxetine (the selectand) were separated on four chiral stationary phases incorporating either quinine [ZWIX(+), ZWIX(+A)] or quinidine [ZWIX(–), ZWIX(–A)] and (R,R)‐aminocyclohexanesulfonic acid [in ZWIX(–), and ZWIX(+A)] or (S,S)‐aminocyclohexanesulfonic acid [in ZWIX(+), and ZWIX(–A)] chiral selectors. The zwitterion nature of the phases is due to the presence of either (R,R)‐ or...

Read More thumbnail image: Exploring the enantiorecognition mechanism of Cinchona alkaloidbased zwitterionic chiral stationary phases and the basic trans paroxetine enantiomers

Exploring the enantiorecognition mechanism of Cinchona alkaloid‐based zwitterionic chiral stationary phases and the basic trans ‐paroxetine enantiomers

Published: Dec 27, 2017

Author(s): Roccaldo Sardella, Antonio Macchiarulo, Fabrizio Urbinati, Federica Ianni, Andrea Carotti, Michal Kohout, Wolfgang Lindner, Antal Péter, István Ilisz

Journal: Journal of Separation Science

Abstract The enantiomers of trans‐paroxetine (the selectand) were separated on four chiral stationary phases incorporating either quinine [ZWIX(+), ZWIX(+A)] or quinidine [ZWIX(–), ZWIX(–A)] and (R,R)‐aminocyclohexanesulfonic acid [in ZWIX(–), and ZWIX(+A)] or (S,S)‐aminocyclohexanesulfonic acid [in ZWIX(+), and ZWIX(–A)] chiral selectors. The zwitterion nature of the phases is due to the presence of either (R,R)‐ or...

Read More thumbnail image: Exploring the enantiorecognition mechanism of Cinchona alkaloidbased zwitterionic chiral stationary phases and the basic trans paroxetine enantiomers

Temperature‐programmed multicapillary gas chromatograph microcolumn for the analysis of odorous sulfur pollutants

Published: Dec 27, 2017

Author(s): Huan Yuan, Xiaosong Du, Huiling Tai, Ming Xu

Journal: Journal of Separation Science

Abstract We report the fabrication and performance of a silicon‐on‐glass micro gas chromatography eight‐capillary column based on microelectromechanical systems technology that is 50 cm long, 30 μm wide, and 300 μm deep. According to the theory of a gas chromatography column, an even gas flow among different capillaries play a vital role in the peak broadening. Thus, a flow splitter structure is designed by the finite...

Read More thumbnail image: Temperatureprogrammed multicapillary gas chromatograph microcolumn for the analysis of odorous sulfur pollutants

Temperature‐programmed multicapillary gas chromatograph microcolumn for the analysis of odorous sulfur pollutants

Published: Dec 27, 2017

Author(s): Huan Yuan, Xiaosong Du, Huiling Tai, Ming Xu

Journal: Journal of Separation Science

Abstract We report the fabrication and performance of a silicon‐on‐glass micro gas chromatography eight‐capillary column based on microelectromechanical systems technology that is 50 cm long, 30 μm wide, and 300 μm deep. According to the theory of a gas chromatography column, an even gas flow among different capillaries play a vital role in the peak broadening. Thus, a flow splitter structure is designed by the finite...

Read More thumbnail image: Temperatureprogrammed multicapillary gas chromatograph microcolumn for the analysis of odorous sulfur pollutants

SERS spectrum of imazalil. Experimental and quantum‐chemical vibrational analysis

Published: Dec 27, 2017

Author(s): Gonzalo Díaz‐Mirón, María A. Sánchez, Doly M. Chemes, Rosa M.S. Álvarez

Journal: Journal of Raman Spectroscopy

Abstract Imazalil [1‐[2‐(2,4‐dichlorophenyl)‐2‐(2‐propenyloxyl‐ethyl]‐1 H imidazole] is a systemic fungicide that is toxic to a number of plant pathogens, particularly species of Penicillum. Its activity is based on the inhibition of mold sporulation on fruit skin, which makes it one of the most commonly used fungicide in post‐harvest citrus treatments for fruit preservation during storage, shipping, and marketing. Due to its wide...

Read More thumbnail image: SERS spectrum of imazalil_ Experimental and quantumchemical vibrational analysis

SERS spectrum of imazalil. Experimental and quantum‐chemical vibrational analysis

Published: Dec 27, 2017

Author(s): Gonzalo Díaz‐Mirón, María A. Sánchez, Doly M. Chemes, Rosa M.S. Álvarez

Journal: Journal of Raman Spectroscopy

Abstract Imazalil [1‐[2‐(2,4‐dichlorophenyl)‐2‐(2‐propenyloxyl‐ethyl]‐1 H imidazole] is a systemic fungicide that is toxic to a number of plant pathogens, particularly species of Penicillum. Its activity is based on the inhibition of mold sporulation on fruit skin, which makes it one of the most commonly used fungicide in post‐harvest citrus treatments for fruit preservation during storage, shipping, and marketing. Due to its wide...

Read More thumbnail image: SERS spectrum of imazalil_ Experimental and quantumchemical vibrational analysis

Molecular sensitivity of metal nanoparticles decorated graphene‐family nanomaterials as surface‐enhanced Raman scattering (SERS) platforms

Published: Dec 27, 2017

Author(s): S. Gupta, A. Banaszak, T. Smith, N. Dimakis

Journal: Journal of Raman Spectroscopy

Abstract Graphene‐mediated surface enhanced Raman scattering is a recent phenomenon that produces clean and reproducible signals from chemical analytes. In this work, we report on the development of graphene‐family nanomaterials (graphene oxide; GO, reduced GO; rGO, and multilayer graphene; MLG) decorated with physisorbed silver (AgNP) and gold (AuNP) nanoparticles and as layered architectures for detection of methylene blue and...

Read More thumbnail image: Molecular sensitivity of metal nanoparticles decorated graphenefamily nanomaterials as surfaceenhanced Raman scattering SERS platforms

Molecular sensitivity of metal nanoparticles decorated graphene‐family nanomaterials as surface‐enhanced Raman scattering (SERS) platforms

Published: Dec 27, 2017

Author(s): S. Gupta, A. Banaszak, T. Smith, N. Dimakis

Journal: Journal of Raman Spectroscopy

Abstract Graphene‐mediated surface enhanced Raman scattering is a recent phenomenon that produces clean and reproducible signals from chemical analytes. In this work, we report on the development of graphene‐family nanomaterials (graphene oxide; GO, reduced GO; rGO, and multilayer graphene; MLG) decorated with physisorbed silver (AgNP) and gold (AuNP) nanoparticles and as layered architectures for detection of methylene blue and...

Read More thumbnail image: Molecular sensitivity of metal nanoparticles decorated graphenefamily nanomaterials as surfaceenhanced Raman scattering SERS platforms

Detection of Sotatercept (ACE‐011) in human serum by SAR‐PAGE and western single blotting

Published: Dec 27, 2017

Author(s): Christian Reichel, Letizia Farmer, Günter Gmeiner, Katja Walpurgis, Mario Thevis

Journal: Drug Testing and Analysis

Abstract A method for the detection of Sotatercept (ACE‐011, ACVR2A‐Fc) in human serum is presented. The method is a modification of a recently published protocol for Luspatercept (ACE‐536, ACVR2B‐Fc), another erythropoiesis stimulating fusion protein. Out of 27 tested antibodies against either the extracellular domain of ACVR2A or the full‐length protein, only 4 antibodies bound strongly enough to Sotatercept for usage with...

Read More thumbnail image: Detection of Sotatercept ACE011 in human serum by SARPAGE and western single blotting

Detection of Sotatercept (ACE‐011) in human serum by SAR‐PAGE and western single blotting

Published: Dec 27, 2017

Author(s): Christian Reichel, Letizia Farmer, Günter Gmeiner, Katja Walpurgis, Mario Thevis

Journal: Drug Testing and Analysis

Abstract A method for the detection of Sotatercept (ACE‐011, ACVR2A‐Fc) in human serum is presented. The method is a modification of a recently published protocol for Luspatercept (ACE‐536, ACVR2B‐Fc), another erythropoiesis stimulating fusion protein. Out of 27 tested antibodies against either the extracellular domain of ACVR2A or the full‐length protein, only 4 antibodies bound strongly enough to Sotatercept for usage with...

Read More thumbnail image: Detection of Sotatercept ACE011 in human serum by SARPAGE and western single blotting

Synthesis of a novel polymeric magnetic solid phase extraction adsorbent for selective extraction of amphetamine from urine samples coupled with high performance liquid chromatography

Published: Dec 27, 2017

Author(s): Arezou Taghvimi, Marjan Ghorbani, Hamed Hamishehkar

Journal: Drug Testing and Analysis

Abstract A novel pH‐responsive block copolymer (Poly ethylene glycol‐b‐poly (N,N‐dimethylaminoethylmethacrylate‐co‐maleic acid) was designed for the decoration and stabilization of magnetic nanoparticles (MNPs) as an efficient magnetic nano adsorbent for extraction of amphetamine (AM) from biological urine samples to be determined by high performance liquid chromatography–ultra violet detector (HPLC–UV). Full characterization of the...

Read More thumbnail image: Synthesis of a novel polymeric magnetic solid phase extraction adsorbent for selective extraction of amphetamine from urine samples coupled with high performance liquid chromatography

Synthesis of a novel polymeric magnetic solid phase extraction adsorbent for selective extraction of amphetamine from urine samples coupled with high performance liquid chromatography

Published: Dec 27, 2017

Author(s): Arezou Taghvimi, Marjan Ghorbani, Hamed Hamishehkar

Journal: Drug Testing and Analysis

Abstract A novel pH‐responsive block copolymer (Poly ethylene glycol‐b‐poly (N,N‐dimethylaminoethylmethacrylate‐co‐maleic acid) was designed for the decoration and stabilization of magnetic nanoparticles (MNPs) as an efficient magnetic nano adsorbent for extraction of amphetamine (AM) from biological urine samples to be determined by high performance liquid chromatography–ultra violet detector (HPLC–UV). Full characterization of the...

Read More thumbnail image: Synthesis of a novel polymeric magnetic solid phase extraction adsorbent for selective extraction of amphetamine from urine samples coupled with high performance liquid chromatography

Surface modification of magnesium hydroxide particles using silane coupling agent by dry process

Published: Dec 27, 2017

Author(s): Shengjie Lan, Donghai Zhu, Lijuan Li, Zhiqi Liu, Zhongmin Zeng, Fugen Song

Journal: Surface and Interface Analysis

In order to improve the dispersion and compatibility of magnesium hydroxide (MH) when added in the polymer matrix as fillers, the surface of MH was modified by dry process using vinyltrimethoxysilane (VTMS), and the interfacial interaction between MH and VTMS was also studied. Scanning electronic microscopy, transmission electron microscopy, and X‐ray powder diffraction analyses showed that the agglomerations of MH particles were...

Read More thumbnail image: Surface modification of magnesium hydroxide particles using silane coupling agent by dry process

First‐principles study of the TiN(111)/ZrN(111) interface

Published: Dec 27, 2017

Author(s): Song Wang, Zan Liu, Xianfeng Yang, Xingwen Fan, Bing Chen, Jingyi Zhang, Da Li

Journal: Surface and Interface Analysis

The TiN(111)/ZrN(111) interface was studied by first‐principles method to provide the theoretical basis for developing the TiN/ZrN coatings. Twelve geometry structures of TiN(111)/ZrN(111) interfaces were established. The calculated interfacial work of adhesion reveals that the N‐terminated TiN/N‐terminated ZrN interface with TL site shows the strongest stability. For this TiN(111)/ZrN(111) interface, the results of the partial density of...

Read More thumbnail image: Firstprinciples study of the TiN111ZrN111 interface

Sputtering of bismuth thin films under MeV Cu heavy ion irradiation: Experimental data and inelastic thermal spike model interpretation.

Published: Dec 27, 2017

Author(s): S. Mammeri, M. Msimanga, A. Dib, H. Ammi, C.A. Pineda‐Vargas

Journal: Surface and Interface Analysis

The sputtering of bismuth (Bi/Si) thin films deposited onto silicon substrates and irradiated by swift Cuq+ heavy ions (q = +4 to +7) was investigated by varying both the ion energy over the 10 to 26‐MeV range and the ion fluence ϕ from 5.1 × 1013 cm−2 to 3.4 × 1015 cm−2. The sputtering yields were determined experimentally via the Rutherford backscattering spectrometry technique using a 2‐MeV He+ ion beam. The...

Read More thumbnail image: Sputtering of bismuth thin films under MeV Cu heavy ion irradiation Experimental data and inelastic thermal spike model interpretation_

Surface functionalization of multiwalled carbon nanotubes by the photo‐responsive strategy of π‐π stacking and azide‐grafting

Published: Dec 27, 2017

Author(s): Yan Zhang, Zhixin Kang, Dexin Chen, Takeshi Bessho

Journal: Surface and Interface Analysis

In this communication, we report a new, simple, and eco‐friendly method to develop highly dispersible multiwalled carbon nanotubes (MWCNTs) by π‐π stacking and azide‐grafting. MWCNTs were functionalized via standard physisorption, followed by nitrene addition using azido compounds upon ultraviolet activation. The functionalized MWCNTs show excellent dispersibility without raising distinct damage, which can bear comparison with that of...

Read More thumbnail image: Surface functionalization of multiwalled carbon nanotubes by the photoresponsive strategy of  stacking and azidegrafting

Effect of AA2024‐T3 surface pretreatment on the physicochemical properties and the anticorrosion performance of poly(γ‐glycidoxypropyltrimethoxysilane) sol‐gel coating

Published: Dec 27, 2017

Author(s): M. Mrad, Y. Ben Amor, L. Dhouibi, M. F. Montemor

Journal: Surface and Interface Analysis

This study investigated the dependence of the anticorrosion performance of a poly(γ‐glycidoxypropyltrimethoxysilane) (poly(γ‐GPTMS)) sol‐gel coating on AA2024‐T3 aluminum alloy surface state. Two different AA2024‐T3 surface pretreatment procedures were tested: a degreasing with acetone and a chemical multistep etching process (industrial chemical etching pretreatment). Poly(γ‐GPTMS) coatings were deposited onto both pretreated surfaces...

Read More thumbnail image: Effect of AA2024T3 surface pretreatment on the physicochemical properties and the anticorrosion performance of polyglycidoxypropyltrimethoxysilane solgel coating

Comparative pharmacokinetics study of orientin in rat plasma by UHPLC‐MS/MS after intravenous administration of single orientin and Trollius chinensis Bunge extract

Published: Dec 26, 2017

Author(s): Nan Zhao, Qi Sun, Yang Song, Lin Wang, Tingjian Zhang, Fanhao Meng

Journal: Biomedical Chromatography

Abstract Orientin showed a broad array of biological activities, and it is the major bioactive compound in the Trollius chinensis Bunge. The aim of this study was to investigate the comparative pharmacokinetics of orientin after intravenous administration of single orientin and T. chinensis Bunge extract. Sample preparation involved a simple one‐step deproteinization procedure with acetonitrile. Chromatographic separation was achieved on a...

Read More thumbnail image: Comparative pharmacokinetics study of orientin in rat plasma by UHPLCMSMS after intravenous administration of single orientin and Trollius chinensis Bunge extract

Comparative pharmacokinetics study of orientin in rat plasma by UHPLC‐MS/MS after intravenous administration of single orientin and Trollius chinensis Bunge extract

Published: Dec 26, 2017

Author(s): Nan Zhao, Qi Sun, Yang Song, Lin Wang, Tingjian Zhang, Fanhao Meng

Journal: Biomedical Chromatography

Abstract Orientin showed a broad array of biological activities, and it is the major bioactive compound in the Trollius chinensis Bunge. The aim of this study was to investigate the comparative pharmacokinetics of orientin after intravenous administration of single orientin and T. chinensis Bunge extract. Sample preparation involved a simple one‐step deproteinization procedure with acetonitrile. Chromatographic separation was achieved on a...

Read More thumbnail image: Comparative pharmacokinetics study of orientin in rat plasma by UHPLCMSMS after intravenous administration of single orientin and Trollius chinensis Bunge extract

Simultaneous determination of tryptophan, kynurenine, kynurenic acid, xanthurenic acid and 5‐hydroxytryptamine in human plasma by LC‐MS/MS and its application to acute myocardial infarction monitoring

Published: Dec 26, 2017

Author(s): Qing Tong, Jia Song, Guangjie Yang, Li Fan, Wei Xiong, Jianguo Fang

Journal: Biomedical Chromatography

Abstract Reliable methods for the determination of tryptophan and its metabolites are vital to the monitoring of biochemical states during the initiation and progression of cardiovascular disease. In the present study, a single‐run liquid chromatography–tandem mass spectrometry (LC‐MS/MS) method was developed for the simultaneous determination of tryptophan (Trp) and its metabolites, including kynurenine (Kyn), kynurenic acid (KA),...

Read More thumbnail image: Simultaneous determination of tryptophan kynurenine kynurenic acid xanthurenic acid and 5hydroxytryptamine in human plasma by LCMSMS and its application to acute myocardial infarction monitoring
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