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Preparation of dummy template‐imprinted polymers for the rapid extraction of nonsteroidal anti‐inflammatory drugs residues in aquatic environmental samples

Published: Feb 22, 2018

Author(s): Ping Guo, Jingjing Zhang, Xiaohui Chen, Longshan Zhao

Journal: Biomedical Chromatography

Abstract A molecularly imprinted polymer was synthesized and applied as a sorbent in the solid‐phase extraction device. The imprinted polymer was characterized by fourier‐transform infrared spectroscopy and scanning electron microscope. The results revealed that imprinted polymer possess sensitive selectivity and reliable adsorption properties for five NSAIDs. The imprinted polymer was successfully applied to the pre‐concentration...

Read More thumbnail image: Preparation of dummy templateimprinted polymers for the rapid extraction of nonsteroidal antiinflammatory drugs residues in aquatic environmental samples

Simultaneous LC‐MS/MS bioanalysis of etoposide and paclitaxel in mouse tissues and plasma after oral administration of self‐microemulsifying drug‐delivery systems

Published: Feb 22, 2018

Author(s): Dan Li, Gang Zhao, Weipeng Ai, Gao Li, Luqin Si, Jiangeng Huang, Yunzhou Chen, Sanlan Wu

Journal: Biomedical Chromatography

Abstract In this study, a liquid chromatography–tandem mass spectrometry (LC‐MS/MS) method was developed and validated to simultaneously determine the anticancer drugs etoposide and paclitaxel in mouse plasma and tissues including liver, kidney, lung, heart, spleen and brain. The analytes were extracted from the matrices of interest by liquid–liquid extraction using methyl tert‐butyl ether–dichloromethane (1:1, v/v). Chromatographic separation...

Read More thumbnail image: Simultaneous LCMSMS bioanalysis of etoposide and paclitaxel in mouse tissues and plasma after oral administration of selfmicroemulsifying drugdelivery systems

Microscale isolation of native forms of lysozyme from chicken egg white by gel isoelectric focusing

Published: Feb 22, 2018

Author(s): Youji Shimazaki, Yoshiko Ochi, Kennosuke Fujimura

Journal: ELECTROPHORESIS

Abstract To separate and extract the native states of lysozyme from chicken egg white, a hybrid method for the mobilization of proteins after non‐denaturing gel isoelectric focusing (IEF) combined with detection of lysozyme activity was developed. When the proteins in the chicken egg white were first separated using non‐denaturing gel IEF, a lysozyme was obtained at the top of the gel column at the cathode end of the IEF. And, when...

Read More thumbnail image: Microscale isolation of native forms of lysozyme from chicken egg white by gel isoelectric focusing

Silicon carbide nanomaterial as a coating for solid‐phase microextraction

Published: Feb 22, 2018

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

Journal: Journal of Separation Science

Abstract Silicon carbide has excellent properties, such as corrosion resistance, high strength, oxidation resistance, high temperature, and so on. Based on these properties, silicon carbide was coated on stainless‐steel wire and used as a solid‐phase microextraction coating, and polycyclic aromatic hydrocarbons were employed as model analytes. Using gas chromatography, some important factors that affect the extraction efficiency...

Read More thumbnail image: Silicon carbide nanomaterial as a coating for solidphase microextraction

Efficient analysis of phytochemical constituents in the peel of Chinese wild citrus Mangshanju ( Citrus reticulata Blanco) by ultra high performance liquid chromatography–quadrupole time‐of‐flight‐mass spectrometry

Published: Feb 22, 2018

Author(s): Xi Juan Zhao, Tian Tian Xing, Yuan Fang Li, Bi Ning Jiao, Dong Jiang

Journal: Journal of Separation Science

Abstract An efficient ultra high‐performance liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry method was developed for separation and profiling of phytochemical constituents of Chinese wild mandarin Mangshanju (Citrus reticulata Blanco). All constituents were well separated within 16 min. Based on retention times, accurate mass, MSE fragments, and/or reference standards as well as databases, a total of 81 compounds were...

Read More thumbnail image: Efficient analysis of phytochemical constituents in the peel of Chinese wild citrus Mangshanju  Citrus reticulata Blanco by ultra high performance liquid chromatographyquadrupole timeofflightmass spectrometry

Simultaneous analysis of tropane alkaloids in teas and herbal teas by liquid chromatography coupled to high‐resolution mass spectrometry (Orbitrap)

Published: Feb 22, 2018

Author(s): Ana Romera‐Torres, Roberto Romero‐González, José Luis Martínez Vidal, Antonia Garrido Frenich

Journal: Journal of Separation Science

Abstract A new method has been developed for the simultaneous determination of 13 tropane alkaloids in tea and herbal teas using high‐performance liquid chromatography coupled to an Exactive‐Orbitrap analyzer. A mixture of methanol, water, and formic acid was used for the extraction of the target compounds followed by a solid‐phase extraction step. The validated method provided recoveries from 75 to 128% with intra‐ and interday...

Read More thumbnail image: Simultaneous analysis of tropane alkaloids in teas and herbal teas by liquid chromatography coupled to highresolution mass spectrometry Orbitrap

Fabrication of an ionic‐liquid‐based polymer monolithic column and its application in the fractionation of proteins from complex biosamples

Published: Feb 22, 2018

Author(s): Doudou Zhang, Qian Zhang, Ligai Bai, Dandan Han, Haiyan Liu, Hongyuan Yan

Journal: Journal of Separation Science

Abstract An ionic‐liquid‐based polymer monolithic column was synthesized by free radical polymerization within the confines of a stainless‐steel column (50 mm × 4.6 mm id). In the processes, ionic liquid and stearyl methacrylate were used as dual monomers, ethylene glycol dimethacrylate as the cross‐linking agent, and polyethylene glycol 200 and isopropanol as co‐porogens. Effects of the prepolymerization ...

Read More thumbnail image: Fabrication of an ionicliquidbased polymer monolithic column and its application in the fractionation of proteins from complex biosamples

Effect of different immobilization strategies on chiral recognition properties of Cinchona ‐based anion exchangers

Published: Feb 22, 2018

Author(s): Michal Kohout, Stefanie Wernisch, Jiří Tůma, Hubert Hettegger, Jan Pícha, Wolfgang Lindner

Journal: Journal of Separation Science

Abstract In the enantiomeric separation of highly polar compounds, a traditionally challenging task for high‐performance liquid chromatography, ion‐exchange chiral stationary phases have found the main field of application. In this contribution, we present a series of novel anion‐exchange‐type chiral stationary phases for enantiomer separation of protected amino phosphonates and N‐protected amino acids. Two of the prepared selectors...

Read More thumbnail image: Effect of different immobilization strategies on chiral recognition properties of Cinchona based anion exchangers

Quantitative magnetic resonance spectroscopy at 3T based on the principle of reciprocity

Published: Feb 21, 2018

Author(s): Niklaus Zoelch, Andreas Hock, Anke Henning

Journal: NMR in Biomedicine

Quantification of magnetic resonance spectroscopy signals using the phantom replacement method requires an adequate correction of differences between the acquisition of the reference signal in the phantom and the measurement in vivo. Applying the principle of reciprocity, sensitivity differences can be corrected at low field strength by measuring the RF transmitter gain needed to obtain a certain flip angle in the measured volume....

Read More thumbnail image: Quantitative magnetic resonance spectroscopy at 3T based on the principle of reciprocity

Theoretical treatment of anharmonicity of vibrational modes of single‐walled carbon nanotubes

Published: Feb 21, 2018

Author(s): Hengjia Wang, Doyl Dickel, Murray S. Daw

Journal: Journal of Raman Spectroscopy

Abstract We report a computational study, using the “moments method” [Y. Gao and M. Daw, Modell. Simul. Mater. Sci. Eng. 23 045002 (2015)], of the anharmonicity of the vibrational modes of single‐walled carbon nanotubes. We find that modes with displacements largely within the wall are more anharmonic than modes with dominantly radial character, except for a set of modes that are related to the radial breathing mode that are the most anharmonic...

Read More thumbnail image: Theoretical treatment of anharmonicity of vibrational modes of singlewalled carbon nanotubes

Laser crystallization of germanium nanowires fabricated by electrochemical deposition

Published: Feb 21, 2018

Author(s): Sergey A. Gavrilov, Alexey A. Dronov, Ilya M. Gavrilin, Roman L. Volkov, Nickolay I. Borgardt, Alexey Yu. Trifonov, Alexander V. Pavlikov, Pavel A. Forsh, Pavel K. Kashkarov

Journal: Journal of Raman Spectroscopy

Abstract Germanium (Ge) nanowires were fabricated by electrochemical deposition on titanium‐coated silicon substrate. Arrays of nanowires with different mean diameters were obtained using indium nanoparticles of various sizes as centers of nucleation. Raman spectroscopy was used to establish the structural properties of nanowires under different laser excitation intensities. Cycles of measurements with different intensities...

Read More thumbnail image: Laser crystallization of germanium nanowires fabricated by electrochemical deposition

Raman spectrum of oxyorthosilicate Lu 2 SiO 5 : Ab initio calculation

Published: Feb 21, 2018

Author(s): Dmitriy V. Nazipov, Anatoliy E. Nikiforov

Journal: Journal of Raman Spectroscopy

Abstract Raman spectra of oxyorthosilicate Lu2SiO5 have been computed in the framework of density functional theory with hybrid functionals using molecular orbitals approximation. Results are compared with existing experimental data. With general agreement with experiment, there are differences in some regions of wavenumbers. Analysis of vibrations has been performed using calculated eigenvectors and isotopic substitution method....

Read More thumbnail image: Raman spectrum of oxyorthosilicate Lu 2 SiO 5  Ab initio calculation

Statistical analysis of cuboctahedral silver nanocrystals Langmuir–Blodgett film SERS substrate

Published: Feb 21, 2018

Author(s): Wei‐Liang Chen, Yi‐Hsin Huang, Hui‐Yu Cheng, Tsung‐Rong Kuo, Yu‐Ming Chang

Journal: Journal of Raman Spectroscopy

Abstract With single‐molecule sensitivity, surface‐enhanced Raman scattering (SERS) has promised to be a powerful tool from chemical analysis to biosensors. However, problem with large signal fluctuations for reproducibility has impeded SERS from widespread application. The fabrication of SERS substrate with large and uniform enhancement in combination with an effective target analyte‐transfer process is crucial for applications of...

Read More thumbnail image: Statistical analysis of cuboctahedral silver nanocrystals LangmuirBlodgett film SERS substrate

Raman spectroscopy and ab initio quantum chemical calculations of ion association behavior in calcium nitrate solution

Published: Feb 21, 2018

Author(s): Fayan Zhu, Hongxia Zhou, Xiufang Wang, Yongquan Zhou, Hongyan Liu, Chunhui Fang, Yan Fang

Journal: Journal of Raman Spectroscopy

Abstract In this work, microscopic Raman spectroscopy and component analysis were used to study a calcium nitrate solution with molar water‐to‐salt ratio (WSR) values of 4–320. The results showed that the symmetrical stretching vibration wavenumber of the nitrate ion (v1‐NO3−) in the solution blue shifted from 1,048 to 1,053 cm−1, and the full width at half maximum increased from 9.7 to 11 cm−1 when the WSR was reduced from 320 to 4....

Read More thumbnail image: Raman spectroscopy and ab initio quantum chemical calculations of ion association behavior in calcium nitrate solution

Removal of brilliant green and malachite green from aqueous solution by a viable magnetic polymeric nanocomposite: Simultaneous spectrophotometric determination of 2 dyes by PLS using original and first derivative spectra

Published: Feb 20, 2018

Author(s): Maryam Bagtash, Javad Zolgharnein

Journal: Journal of Chemometrics

Abstract Here, we describe the successful synthesis of a new magnetic nanocomposite and investigate simultaneous removal of 2 cationic dyes, brilliant green (BG) and malachite green (MG), from aqueous solutions. The nanocomposite is characterized by scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, thermal gravimetric analysis, and Fourier‐transform infrared spectrophotometry. The spectra of BG and MG in their mixture show...

Read More thumbnail image: Removal of brilliant green and malachite green from aqueous solution by a viable magnetic polymeric nanocomposite Simultaneous spectrophotometric determination of 2 dyes by PLS using original and first derivative spectra

Intestinal metabolism of Polygonum cuspidatum in vitro and in vivo

Published: Feb 20, 2018

Author(s): Jinfeng Fu, Songyan Wu, Min Wang, Yuan Tian, Zunjian Zhang, Rui Song

Journal: Biomedical Chromatography

Abstract Rhizoma et Radix Polygoni Cuspidati (RRPC) is commonly prescribed for the treatment of amenorrhea, arthralgia, jaundice and abscess in traditional Chinese medicine. Previous pharmacological studies have indicated that polyphenols are the main pharmacological active ingredients in RRPC. Meanwhile, the poor bioavailability of polyphenols in RRPC implies that those components are probably metabolized by intestinal bacteria...

Read More thumbnail image: Intestinal metabolism of Polygonum cuspidatum in vitro and in vivo

Proteomics Analysis of Skeletal Muscle from Leptin‐Deficient ob/ob Mice Reveals Adaptive Remodeling of Metabolic Characteristics and Fiber Type Composition

Published: Feb 20, 2018

Author(s): Milena Schönke, Marie Björnholm, Alexander V. Chibalin, Juleen R. Zierath, Atul S. Deshmukh

Journal: PROTEOMICS

Abstract Skeletal muscle insulin resistance, an early metabolic defect in the pathogenesis of type 2 diabetes (T2D), may be a cause or consequence of altered protein expression profiles. Proteomics technology offers enormous promise to investigate molecular mechanisms underlying pathologies, however, the analysis of skeletal muscle is challenging. Using state‐of‐the‐art multienzyme digestion and filter‐aided sample preparation...

Read More thumbnail image: Proteomics Analysis of Skeletal Muscle from LeptinDeficient obob Mice Reveals Adaptive Remodeling of Metabolic Characteristics and Fiber Type Composition

Quantitative Proteomic Analysis in Candida albicans Using SILAC‐Based Mass Spectrometry

Published: Feb 20, 2018

Author(s): Iliyana N. Kaneva, Joseph Longworth, Peter E. Sudbery, Mark J. Dickman

Journal: PROTEOMICS

Abstract Stable isotope labelling by amino acids in cell culture (SILAC) in conjunction with MS analysis is a sensitive and reliable technique for quantifying relative differences in protein abundance and posttranslational modifications between cell populations. We develop and utilise SILAC‐MS workflows for quantitative proteomics in the fungal pathogen Candida albicans. Arginine metabolism provides important cues for escaping host defences...

Read More thumbnail image: Quantitative Proteomic Analysis in Candida albicans Using SILACBased Mass Spectrometry

Development and validation of a stability‐indicating HPLC method for topiramate using a mixed‐mode column and charged aerosol detector

Published: Feb 20, 2018

Author(s): Eduardo Costa Pinto, Mariana da Silva Gonçalves, Lucio Mendes Cabral, Daniel W. Armstrong, Valéria Pereira de Sousa

Journal: Journal of Separation Science

Abstract The analysis of topiramate in the presence of its main degradation products is challenging due to the absence of chromophore moieties and their wide range of polarity. Mixed‐mode chromatography has been used in such cases because it combines two or more modes of separation. Charged aerosol detector is also an alternative since its detection is independent of optical properties and analyte ionization. This study is aimed to...

Read More thumbnail image: Development and validation of a stabilityindicating HPLC method for topiramate using a mixedmode column and charged aerosol detector

Enantiomeric separation of six chiral pesticides that contain chiral sulfur/phosphorus atoms by supercritical fluid chromatography

Published: Feb 20, 2018

Author(s): Lijun Zhang, Yelong Miao, Chunmian Lin

Journal: Journal of Separation Science

Abstract Six chiral pesticides containing chiral sulfur/phosphorus atoms were separated by supercritical fluid chromatography with supercritical CO2 as the main mobile phase component. The effect of the chiral stationary phase, different type and concentration of modifiers, column temperature, and backpressure on the separation efficiency was investigated to obtain the appropriate separation condition. Five chiral pesticides...

Read More thumbnail image: Enantiomeric separation of six chiral pesticides that contain chiral sulfurphosphorus atoms by supercritical fluid chromatography
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