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Application of micro‐solid‐phase extraction for the on‐site extraction of heterocyclic aromatic amines in seawater

Published: Feb 1, 2018

Author(s): Chanbasha Basheer

Journal: Journal of Separation Science

Abstract An efficient on‐site extraction technique to determine carcinogenic heterocyclic aromatic amines in seawater has been reported. A micro‐solid‐phase extraction device placed inside a portable battery‐operated pump was used for the on‐site extraction of seawater samples. Before on‐site applications, parameters that influence the extraction efficiency (extraction time, type of sorbent materials, suitable desorption solvent,...

Read More thumbnail image: Application of microsolidphase extraction for the onsite extraction of heterocyclic aromatic amines in seawater

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

γ‐Secretase Inhibition Induces Muscle Hypertrophy in a Notch‐Independent Mechanism

Published: Feb 1, 2018

Author(s): Ivone Rosa de Andrade, Stephany Corrêa, Marcio Fontenele, John Douglas Oliveira Teixeira, Eliana Abdelhay, Manoel Luis Costa, Claudia Mermelstein

Journal: PROTEOMICS

Abstract A wide variety of cellular processes and signaling events are regulated by the proteolytic enzyme γ‐secretase. Notch‐1 is one of the substrates of γ‐secretase and its role in the regulation of muscle differentiation has been well described. Importantly, besides Notch‐1, a number of proteins have been identified to undergo proteolysis by γ‐secretase. To date, the specific role of γ‐secretase during embryonic skeletal muscle...

Read More thumbnail image: Secretase Inhibition Induces Muscle Hypertrophy in a NotchIndependent Mechanism

Cancer Associated Fibroblasts: The Architects of Stroma Remodeling

Published: Feb 1, 2018

Author(s): Alice Santi, Fernanda G. Kugeratski, Sara Zanivan

Journal: PROTEOMICS

Abstract Fibroblasts have exceptional phenotypic plasticity and capability to secrete vast amount of soluble factors, extracellular matrix components and extracellular vesicles. While in physiological conditions this makes fibroblasts master regulators of tissue homeostasis and healing of injured tissues, in solid tumors cancer associated fibroblasts (CAFs) co‐evolve with the disease, and alter the biochemical and physical structure...

Read More thumbnail image: Cancer Associated Fibroblasts The Architects of Stroma Remodeling

A combination of dispersive liquid–liquid microextraction and surface plasmon resonance sensing of gold nanoparticles for the determination of ziram pesticide

Published: Feb 1, 2018

Author(s): Fatemeh Hashemi, Saadat Rastegarzadeh, Nahid Pourreza

Journal: Journal of Separation Science

Abstract We have developed a reliable, fast, and highly sensitive analytical method utilizing dispersive liquid–liquid microextraction and gold nanoparticles probes for ziram (zinc bis(dimethyldithiocarbamate)) determination. The method is based on the in situ formation of gold nanoparticles in carbon tetrachloride as an organic phase. It was found that the trace levels of ziram influenced the formation of gold nanoparticles,...

Read More thumbnail image: A combination of dispersive liquidliquid microextraction and surface plasmon resonance sensing of gold nanoparticles for the determination of ziram pesticide

Optimization of the surface modification process of cross‐linked polythiol‐coated chiral stationary phases synthesized by a two‐step thiol‐ene click reaction #

Published: Feb 1, 2018

Author(s): Kristina Schmitt, Michael Lämmerhofer

Journal: Journal of Separation Science

Abstract A new platform technology for the preparation of stable chiral stationary phases was successfully optimized. The chiral selector tert‐butylcarbamoylquinine was firstly covalently connected to the polymer poly(3‐mercaptopropyl)methylsiloxane by thiol‐ene click reaction. Secondly, the quinine carbamate functionalized polysiloxane conjugate was coated onto the surface of vinyl modified silica particles and cross‐linked via...

Read More thumbnail image: Optimization of the surface modification process of crosslinked polythiolcoated chiral stationary phases synthesized by a twostep thiolene click reaction

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

A convenient ultrasound‐assisted saponification for the simultaneous determination of vitamin E isomers in vegetable oil by HPLC with fluorescence detection

Published: Feb 1, 2018

Author(s): Yi Yang, Dan Lu, Shuo Yin, Danni Yang, Yaling Chen, Yongxin Li, Chengjun Sun

Journal: Journal of Separation Science

Abstract An efficient ultrasound‐assisted saponification was developed for simultaneous determination of vitamin E isomers in vegetable oil by high‐performance liquid chromatography with fluorescence detection. The samples were saponified ultrasonically with potassium hydroxide solution for only 7 min, then the analytes were extracted with ether. Vitamin E isomers were separated on a C18 column at 25°C with a mobile phase of...

Read More thumbnail image: A convenient ultrasoundassisted saponification for the simultaneous determination of vitamin E isomers in vegetable oil by HPLC with fluorescence detection

Flotation/ultrasound‐assisted microextraction followed by HPLC for determination of fat‐soluble vitamins in multivitamin pharmaceutical preparations

Published: Feb 1, 2018

Author(s): Parvin Shahdousti, Mohammad Aghamohammadi

Journal: Journal of Separation Science

Abstract Dissolved carbon dioxide flotation–emulsification microextraction technique coupled with high‐performance liquid chromatography was developed for separation and determination of fat‐soluble vitamins (A, D3, E, and K3) in multivitamin pharmaceutical preparations. Dissolved carbon dioxide flotation was used to break up the emulsion of extraction solvent in water and to collect the extraction solvent on the surface of aqueous sample in...

Read More thumbnail image: Flotationultrasoundassisted microextraction followed by HPLC for determination of fatsoluble vitamins in multivitamin pharmaceutical preparations

A novel spinel coating on cobalt‐based Superalloy GH605 via an in‐situ oxidation approach

Published: Feb 1, 2018

Author(s): Kai Zhang, Jinglei Liu, Binbin Bao, Hong Xu

Journal: Surface and Interface Analysis

Cr‐Mn‐O spinel coating was prepared on the surface of cobalt‐based superalloy GH605 via an in‐situ oxidation method in H2O‐H2 environment. The composition, morphology, and chemical value state of the oxide spinel coatings were investigated by SEM, EDS, XRD, Raman spectra, and XPS. It indicated that the morphology of coating varied with oxidation temperature, and granular surface appeared when oxidation temperature increased to 1100°C. The formed...

Read More thumbnail image: A novel spinel coating on cobaltbased Superalloy GH605 via an insitu oxidation approach

Interview with David A. Case: On force fields, biomolecular modeling, and NMR

Published: Feb 1, 2018

Author(s): David A. Case, Nikolai R. Skrynnikov

Journal: Concepts in Magnetic Resonance Part A

Abstract Prof. David Case is based in the Department of Chemistry and Chemical Biology at Rutgers University. In this interview he speaks about force field development and validation, predictive power of MD models, combining physics‐based force fields with empirical scoring functions, MD modeling of disordered proteins and RNA, synergies between MD simulations and NMR measurements, and chemical shift calculations. The video of this...

Read More thumbnail image: Interview with David A_ Case On force fields biomolecular modeling and NMR

Van't Hoff analysis in chiral chromatography

Published: Jan 31, 2018

Author(s): Leonid D. Asnin, Maria V. Stepanova

Journal: Journal of Separation Science

Abstract The present review discusses the theory and application of van't Hoff analysis in chiral chromatography, with main focus on liquid chromatography. The topics considered include the physical meaning of van't Hoff equation's parameters, interpretation of thermodynamic data in terms of retention and enantioseparation mechanisms, abnormal behavior of van't Hoff plots, and best practices to avoid biased results. ...

Read More thumbnail image: Vant Hoff analysis in chiral chromatography

Systematic study on metabolism and activity evaluation of Radix Scutellaria extract in rat plasma using UHPLC with quadrupole time‐of‐flight mass spectrometry and microdialysis intensity‐fading mass spectrometry

Published: Jan 31, 2018

Author(s): Xueju Zhang, Shu Liu, Junpeng Xing, Zifeng Pi, Zhiqiang Liu, Fengrui Song

Journal: Journal of Separation Science

Abstract Radix Scutellaria is a widely used traditional Chinese medicine in the treatment of various diseases. However, the activities of the absorbed components and metabolites of its main flavones in rat plasma need further investigation. In this study, a systematic method based on ultra‐high performance liquid chromatography with quadruple time‐of‐flight mass spectrometry was developed to speculate the absorbed components and...

Read More thumbnail image: Systematic study on metabolism and activity evaluation of Radix Scutellaria extract in rat plasma using UHPLC with quadrupole timeofflight mass spectrometry and microdialysis intensityfading mass spectrometry

β‐Cyclodextrin polymer@Fe 3 O 4 based magnetic solid‐phase extraction coupled with HPLC for the determination of benzoylurea insecticides from honey, tomato, and environmental water samples

Published: Jan 31, 2018

Author(s): Xinyu Liang, Ruiyang Ma, Lin Hao, Chun Wang, Qiuhua Wu, Zhi Wang

Journal: Journal of Separation Science

Abstract In this work, a magnetic β‐cyclodextrin polymer was successfully prepared and used as an adsorbent for the magnetic solid‐phase extraction of six benzoylurea insecticides (diflubenzuron, triflumuron, hexaflumuron, teflubenzuron, flufenoxuron, and chlorfluazuron) from honey, tomato, and environmental water samples. The influence of the main experimental conditions on the extraction was studied. Under the optimized...

Read More thumbnail image: Cyclodextrin polymerFe 3 O 4 based magnetic solidphase extraction coupled with HPLC for the determination of benzoylurea insecticides from honey tomato and environmental water samples

Coupling colloidal forces with yield stress of charged inorganic particle suspension: A review

Published: Jan 31, 2018

Author(s): Akira Otsuki

Journal: ELECTROPHORESIS

Abstract This paper aims to summarize the series of investigations on coupling suspension yield stress and DLVO (Derjaguin‐Landau‐Verwey‐Overbeek) forces, i.e. van der Waals and electrical double layer forces. This summary provides a better understanding of the basic phenomena associated, historical development and current status of this useful coupling, and also discusses the applicability and limitations/variations of such...

Read More thumbnail image: Coupling colloidal forces with yield stress of charged inorganic particle suspension A review

EDXRF analysis of suspended particulate matter (SPM) from residential and industrial areas in Cairo, Egypt

Published: Jan 30, 2018

Author(s): Abdallah A. Shaltout, Salwa K. Hassan, Andreas G. Karydas, Messaoud Harfouche, Omar H. Abd‐Elkader, Peter Kregsamer, Peter Wobrauschek, Christina Streli

Journal: X-Ray Spectrometry

Due to the remarkable increasing of the mass concentrations of suspended particulate matter (SPM) as an air pollution indicator in Greater Cairo‐Egypt, regular sampling during autumn 2014 and winter 2014/2015 seasons has been performed from industrial and residential areas. It was found that the average mass concentrations of the SPM collected from residential and industrial areas are equal to 531 ± 198 and...

Read More thumbnail image: EDXRF analysis of suspended particulate matter SPM from residential and industrial areas in Cairo Egypt
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