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Computers in mass spectrometry

Published: Apr 28, 2017

Author(s):

Journal: Mass Spectrometry Reviews

Read More thumbnail image: Computers in mass spectrometry

Modeling and simulation of dielectrophoretic collective dynamics in a suspension of polarizable particles under the action of a gradient AC electric field

Published: Apr 28, 2017

Author(s): Shigeru Tada, Yan Shen, Zhiyong Qiu

Journal: ELECTROPHORESIS

When a suspension of polarizable particles is subjected to a gradient AC electric field, the particles exhibit collective motion due to an interaction between the dipole induced in the particles and the spatial gradient of the electric field; this is known as dielectrophoresis. In the present study, the collective dynamics of suspended particles in a parallel‐plate electric chamber was investigated by simulating numerically the...

Read More thumbnail image: Modeling and simulation of dielectrophoretic collective dynamics in a suspension of polarizable particles under the action of a gradient AC electric field

Migration time shift of analytes in micellar electrokinetic chromatography induced by stacking

Published: Apr 28, 2017

Author(s): Szymon Dziomba, Krzesimir Ciura, Michał J. Markuszewski, Bartosz Wielgomas

Journal: ELECTROPHORESIS

A significant shift of migration time of nonretained compounds (ascorbic acid and cysteine) in micellar electrokinetic chromatography was observed under variation of sample matrix composition. The shift was affected by borate buffer concentration in sample matrix, sample injection time, and pH of BGE (80 mM SDS, Tris/HCl). Surprisingly, longer migration time of analyte was recorded at higher pH of separation buffer. These...

Read More thumbnail image: Migration time shift of analytes in micellar electrokinetic chromatography induced by stacking

Probabilistic peak detection in CE‐LIF for STR DNA typing

Published: Apr 28, 2017

Author(s): Michael Woldegebriel, Arian Asten, Ate Kloosterman, Gabriel Vivó‐Truyols

Journal: ELECTROPHORESIS

In this work, we present a novel probabilistic peak detection algorithm based on a Bayesian framework for forensic DNA analysis. The proposed method aims at an exhaustive use of raw electropherogram data from a laser‐induced fluorescence multi‐CE system. As the raw data are informative up to a single data point, the conventional threshold‐based approaches discard relevant forensic information early in the data analysis pipeline. Our...

Read More thumbnail image: Probabilistic peak detection in CELIF for STR DNA typing

Development and validation of a reversed‐phase HPLC method for the quantification of paclitaxel in different PLGA nanocarriers

Published: Apr 28, 2017

Author(s): Christophe Furman, Rodolphe Carpentier, Amélie Barczyk, Philippe Chavatte, Didier Betbeder, Emmanuelle Lipka

Journal: ELECTROPHORESIS

A reversed‐phase high‐performance liquid chromatography (RP‐HPLC) method has been developed and validated for the quantification of paclitaxel encapsulated in biodegradable poly(lactic‐co‐glycolic) (PLGA) copolymer nanoparticles. This simple (isocratic mode, without additive) and rapid (retention time of the paclitaxel under 4 min) methodology permits the detection of low quantities of paclitaxel in nanoparticulate formulations and the...

Read More thumbnail image: Development and validation of a reversedphase HPLC method for the quantification of paclitaxel in different PLGA nanocarriers

Separation of cucurbitane triterpenoids from bitter melon drinks and determination of partition coefficients using vortex‐assisted dispersive liquid‐phase microextraction followed by UHPLC analysis

Published: Apr 27, 2017

Author(s): Shuang Hu, Yan‐Hong Wang, Bharathi Avula, Mei Wang, Ikhlas A Khan

Journal: Journal of Separation Science

A rapid, effective method applying vortex‐assisted liquid–liquid microextraction before ultra‐high performance liquid chromatography with mass spectrometry and evaporative light scattering detection was developed for the analysis of four cucurbitane triterpenoids (momordicoside L, momordicoside K, momordicoside F2, and 3β,7β,25‐trihydroxy cucurbita‐5,23(E)‐dien‐19‐al) in bitter melon juices. Variables affecting the extraction efficiency including...

Read More thumbnail image: Separation of cucurbitane triterpenoids from bitter melon drinks and determination of partition coefficients using vortexassisted dispersive liquidphase microextraction followed by UHPLC analysis

Simultaneous determination of 106 pesticides in nuts by LC–MS/MS using freeze‐out combined with dispersive solid‐phase extraction purification

Published: Apr 27, 2017

Author(s): Jingjing Wang, Zhiguo Gong, Tingting Zhang, Shun Feng, Jide Wang, Yi Zhang

Journal: Journal of Separation Science

As a result of the low water content and high fat matrices in nuts, it is very difficult to simultaneously determine multi‐pesticides in trace levels. Here, a sample pretreatment method was developed in which, microwave‐assisted solvent extraction was firstly used to extract pesticides, and then a two‐step cleanup method was conducted combining freeze‐out with dispersive solid‐phase extraction to remove the lipidic matrix. By this way,...

Read More thumbnail image: Simultaneous determination of 106 pesticides in nuts by LCMSMS using freezeout combined with dispersive solidphase extraction purification

Improved sensitivity by post‐column chemical environment modification of CE‐ESI‐MS using a flow‐through microvial interface

Published: Apr 26, 2017

Author(s): Jessica May Risley, David Da Yong Chen

Journal: ELECTROPHORESIS

Post‐column chemical environment modification can affect detection sensitivity and signal appearance when capillary electrophoresis is coupled through electrospray ionization to mass spectrometry (CE‐ESI‐MS). In this study, changes in the signal intensity and peak shape of N‐Acetylneuraminic acid (Neu5Ac) were examined when the modifier solution used in a flow‐through microvial interface for CE‐ESI‐MS was prepared using an acidic or basic...

Read More thumbnail image: Improved sensitivity by postcolumn chemical environment modification of CEESIMS using a flowthrough microvial interface

Integrated electrokinetically driven microfluidic devices with pH‐mediated solid‐phase extraction coupled to microchip electrophoresis for preterm birth biomarkers

Published: Apr 25, 2017

Author(s): Mukul Sonker, Radim Knob, Vishal Sahore, Adam T. Woolley

Journal: ELECTROPHORESIS

Integration in microfluidics is important for achieving automation. Sample preconcentration integrated with separation in a microfluidic setup can have a substantial impact on rapid analysis of low‐abundance disease biomarkers. Here, we have developed a microfluidic device that uses pH‐mediated solid‐phase extraction (SPE) for the enrichment and elution of preterm birth (PTB) biomarkers. Furthermore, this SPE module was integrated with...

Read More thumbnail image: Integrated electrokinetically driven microfluidic devices with pHmediated solidphase extraction coupled to microchip electrophoresis for preterm birth biomarkers

The effect of tripterygium glucoside tablet on pharmacokinetics of losartan and its metabolite EXP3174 in rats

Published: Apr 24, 2017

Author(s): Yongsheng Hu, Xuexue Zhou, Hui Shi, Wenyu Shi, Shengjie Ye, Hai Zhang

Journal: Biomedical Chromatography

Abstract Losartan and tripterygium glucoside tablet (TGT) are often simultaneously used for reducing urine protein excretion in clinic. However, it is unknown whether there is potential herb–drug interaction between losartan and TGT. The aim of this study was to investigate their potential herb–drug interaction, and clarify the mechanism of the effect of TGT on the pharmacokinetics of losartan and its metabolite EXP3174 in rats. The...

Read More thumbnail image: The effect of tripterygium glucoside tablet on pharmacokinetics of losartan and its metabolite EXP3174 in rats

Identification of small molecules using accurate mass MS/MS search

Published: Apr 24, 2017

Author(s): Tobias Kind, Hiroshi Tsugawa, Tomas Cajka, Yan Ma, Zijuan Lai, Sajjan S. Mehta, Gert Wohlgemuth, Dinesh Kumar Barupal, Megan R. Showalter, Masanori Arita, Oliver Fiehn

Journal: Mass Spectrometry Reviews

Tandem mass spectral library search (MS/MS) is the fastest way to correctly annotate MS/MS spectra from screening small molecules in fields such as environmental analysis, drug screening, lipid analysis, and metabolomics. The confidence in MS/MS‐based annotation of chemical structures is impacted by instrumental settings and requirements, data acquisition modes including data‐dependent and data‐independent methods,...

Read More thumbnail image: Identification of small molecules using accurate mass MSMS search

Simultaneous quantitative determination of 13 active components in the traditional Chinese medicinal preparation Suanzaoren oral liquid by HPLC coupled with diode array detection and evaporative light scattering detection

Published: Apr 24, 2017

Author(s): Lin Zhu, Zhenru Wang, Xinran Zhai, Zhenyu Sui, Di Wang, Qing Li, Kaishun Bi, Bosai He, Tiejie Wang

Journal: Journal of Separation Science

To control the quality of different forms of Suanzaoren decoction, an effective and reliable method for the simultaneous determination of 13 major components (neomangiferin, mangiferin, spinosin, liquiritin apioside, liquiritin, 6′′′‐feruloylspinosin, senkyunolide I, timosaponin BII, isoliquiritoside, timosaponin C, jujuboside A, jujuboside B, and timosaponin AIII) was developed and validated for the first time in this study using...

Read More thumbnail image: Simultaneous quantitative determination of 13 active components in the traditional Chinese medicinal preparation Suanzaoren oral liquid by HPLC coupled with diode array detection and evaporative light scattering detection

Analysis of genetic variants of transferrin in human serum after desialylation by capillary zone electrophoresis and capillary isoelectric focusing

Published: Apr 24, 2017

Author(s): Jitka Caslavska, Christian Lanz, Patricie Burda, Micha Tobler, Wolfgang Thormann

Journal: Journal of Separation Science

Capillary electrophoresis analysis of transferrin in human serum is used to assess genetic variants after desialylation with neuraminidase and iron saturation to reduce the complexity of the transferrin pattern and thus facilitate the recognition of transferrin polymorphisms. Asialo‐transferrin forms are analyzed by capillary zone electrophoresis using assay conditions as for the monitoring of carbohydrate‐deficient transferrin or by...

Read More thumbnail image: Analysis of genetic variants of transferrin in human serum after desialylation by capillary zone electrophoresis and capillary isoelectric focusing

Quality assessment of crude and processed Arecae semen based on colorimeter and HPLC combined with chemometrics methods

Published: Apr 24, 2017

Author(s): Meng Sun, Donghui Yan, Xiaolu Yang, Xingyang Xue, Sujuan Zhou, Shengwang Liang, Shumei Wang, Jiang Meng

Journal: Journal of Separation Science

Raw Arecae Semen, the seed of Areca catechu L., as well as Arecae Semen Tostum and Arecae semen carbonisata are traditionally processed by stir‐baking for subsequent use in a variety of clinical applications. These three Arecae semen types, important Chinese herbal drugs, have been used in China and other Asian countries for thousands of years. In this study, the sensory technologies of a colorimeter and sensitive validated...

Read More thumbnail image: Quality assessment of crude and processed Arecae semen based on colorimeter and HPLC combined with chemometrics methods

Deep eutectic solvent based gas‐assisted dispersive liquid‐phase microextraction combined with gas chromatography and flame ionization detection for the determination of some pesticide residues in fruit and vegetable samples

Published: Apr 24, 2017

Author(s): Mir Ali Farajzadeh, Masoumeh Sattari Dabbagh, Adeleh Yadeghari

Journal: Journal of Separation Science

In this study, a gas‐assisted dispersive liquid‐phase microextraction method using a deep eutectic solvent as the extraction solvent combined with gas chromatography and flame ionization detection was developed for the extraction and determination of some pesticide residues in vegetable and fruit juice samples. In this method, choline chloride and 4‐chlorophenol at a molar ratio of 1:2 were mixed. By heating and vortexing, a clear,...

Read More thumbnail image: Deep eutectic solvent based gasassisted dispersive liquidphase microextraction combined with gas chromatography and flame ionization detection for the determination of some pesticide residues in fruit and vegetable samples

Online stacking of carboxylated magnetite core–shell nanoparticles in capillary electrophoresis

Published: Apr 24, 2017

Author(s): Daniel Baron, Petra Dolanská, Zdenka Medříková, Radek Zbořil, Jan Petr

Journal: Journal of Separation Science

The stacking effect on carboxylated magnetite core–shell nanoparticles using sodium borate buffer pH 9.5 as the background electrolyte is presented. The ionic strength of the background electrolyte ranged from 5 to 100 mM, and the ionic strength of a sample zone ranged from 5 to 100 mM. Moreover, water was used as the sample dispersant. Both stacking and de‐stacking effects were observed when conductivities of the sample zone...

Read More thumbnail image: Online stacking of carboxylated magnetite coreshell nanoparticles in capillary electrophoresis

Optimization of extraction of linarin from Flos chrysanthemi indici by response surface methodology and artificial neural network

Published: Apr 24, 2017

Author(s): Hongye Pan, Qing Zhang, Keke Cui, Guoquan Chen, Xuesong Liu, Longhu Wang

Journal: Journal of Separation Science

The extraction of linarin from Flos chrysanthemi indici by ethanol was investigated. Two modeling techniques, response surface methodology and artificial neural network, were adopted to optimize the process parameters, such as, ethanol concentration, extraction period, extraction frequency, and solvent to material ratio. We showed that both methods provided good predictions, but artificial neural network provided a better and more...

Read More thumbnail image: Optimization of extraction of linarin from Flos chrysanthemi indici by response surface methodology and artificial neural network

Magnetic spherical carbon as an efficient adsorbent for the magnetic extraction of phthalate esters from lake water and milk samples

Published: Apr 24, 2017

Author(s): Juanjuan Wu, Chenhuan Wang, Xinyu Liang, Xiumin Yang, Chun Wang, Qiuhua Wu, Zhi Wang

Journal: Journal of Separation Science

Magnetic spherical carbon was synthesized by a facile hydrothermal carbonization procedure with biomass glucose as the carbon precursor and nanoclusters iron colloid as magnetic precursor. The textures of the as‐prepared magnetic spherical carbon were characterized by nitrogen adsorption–desorption isotherms, X‐ray diffraction, transmission electron microscopy, scanning electron microscopy and vibration sample magnetometry. Results...

Read More thumbnail image: Magnetic spherical carbon as an efficient adsorbent for the magnetic extraction of phthalate esters from lake water and milk samples

High‐throughput ultra high performance liquid chromatography combined with mass spectrometry approach for the rapid analysis and characterization of multiple constituents of the fruit of Acanthopanax senticosus (Rupr. et Maxim.) Harms

Published: Apr 24, 2017

Author(s): Yue Han, Aihua Zhang, Hui Sun, Yingzhi Zhang, Xiangcai Meng, Guangli Yan, Liang Liu, Xijun Wang

Journal: Journal of Separation Science

Acanthopanax senticosus (Rupr. et Maxim.) Harms, a traditional Chinese medicine, has been widely used to improve the function of skeleton, heart, spleen and kidney. This fruit is rich in nutrients, but the chemical constituents of Acanthopanax senticosus fruit are still unclear. A rapid method based on ultra high performance liquid chromatography with time‐of‐flight mass spectrometry was developed for the compound analysis of Acanthopanax senticosus...

Read More thumbnail image: Highthroughput ultra high performance liquid chromatography combined with mass spectrometry approach for the rapid analysis and characterization of multiple constituents of the fruit of Acanthopanax senticosus Rupr_ et Maxim_ Harms

Ternary choline chloride/caffeic acid/ethylene glycol deep eutectic solvent as both a monomer and template in a molecularly imprinted polymer

Published: Apr 24, 2017

Author(s): Najing Fu, Xiao Liu, Liteng Li, Baokun Tang, Kyung Ho Row

Journal: Journal of Separation Science

A molecularly imprinted polymer based on a ternary deep eutectic solvent comprised of choline chloride/caffeic acid/ethylene glycol was prepared. The caffeic acid in the ternary deep eutectic solvent was used as both a monomer and template. The molecularly imprinted polymer based on the ternary deep eutectic solvent was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, field‐emission scanning electron...

Read More thumbnail image: Ternary choline chloridecaffeic acidethylene glycol deep eutectic solvent as both a monomer and template in a molecularly imprinted polymer
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