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Recent advances in direct current electrokinetic manipulation of particles for microfluidic applications

Published: Mar 8, 2019

Author(s): Xiangchun Xuan

Journal: ELECTROPHORESIS

Abstract Microfluidic devices have been extensively used to achieve precise transport and placement of a variety of particles for numerous applications. A range of force fields have thus far been demonstrated to control the motion of particles in microchannels. Among them, electric field‐driven particle manipulation may be the most popular and versatile technique because of its general applicability and adaptability as well as the ease of operation and integration into lab‐on‐a‐chip systems....

Read More thumbnail image: Recent advances in direct current electrokinetic manipulation of particles for microfluidic applications

Paul Vouros and northeastern university/barnett institute

Published: Mar 7, 2019

Author(s): Barry L. Karger

Journal: Mass Spectrometry Reviews

Read More thumbnail image: Paul Vouros and northeastern universitybarnett institute

One‐pot synthesis of highly fluorescent silicon nanoparticles for sensitive and selective detection of hemoglobin

Published: Mar 7, 2019

Author(s): Quan Li, Kaite Peng, Yingchun Yu, Xiangyan Ruan, Yun Wei

Journal: ELECTROPHORESIS

Abstract In this work, a simple, selective, and sensitive probe for hemoglobin based on the quenched fluorescence of silicon nanoparticles (SiNPs) was fabricated. The SiNPs were synthesized by a simple hydrothermal treatment from N‐[3‐(trimethoxysilyl)propyl]ethylenediamine and sodium citrate. The as‐prepared SiNPs exhibited good water‐solubility and high fluorescence with the quantum yield of 70%. The fluorescence of the SiNPs could be remarkably quenched by hemoglobin. A wide linear range...

Read More thumbnail image: Onepot synthesis of highly fluorescent silicon nanoparticles for sensitive and selective detection of hemoglobin

Tailoring and investigation of surface chemical nature of virgin and ion beam modified muscovite mica

Published: Mar 7, 2019

Author(s): Dipak Bhowmik, Prasanta Karmakar

Journal: Surface and Interface Analysis

We report that the surface chemical properties of muscovite mica [KAl2(Si3Al)O10(OH)2] like important multi‐elemental layered substrate can be precisely tailored by ion bombardment. The detailed X‐ray photoelectron spectroscopic studies of a freshly cleaved as well as 12‐keV Ar+ and N+ ion bombarded muscovite mica surfaces show immense changes of the surface composition due to preferential sputtering of different elements and the chemical reaction of implanted ions with the surface. We observe...

Read More thumbnail image: Tailoring and investigation of surface chemical nature of virgin and ion beam modified muscovite mica

EIS investigation of a Ce‐based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA

Published: Mar 7, 2019

Author(s): Oscar Mauricio Prada Ramirez, Fernanda Martins Queiroz, Maysa Terada, Uyime Donatus, Isolda Costa, Marie‐Georges Olivier, Hercílio Gomes Melo

Journal: Surface and Interface Analysis

In the aircraft industry, anodizing and posttreatment steps use Cr (VI) compounds, which, despite offering good corrosion resistance and self‐healing properties, are highly toxic and carcinogenic. Ce compounds are recognized as efficient corrosion inhibitors for Al alloys, and several works report self‐healing ability for these chemicals. In this investigation, the corrosion resistance of Alclad AA2024‐T3 alloy anodized in tartaric‐sulphuric acid (TSA) bath and posttreated in a solution...

Read More thumbnail image: EIS investigation of a Cebased posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA

Active corrosion protection of various aluminium alloys by lithium‐leaching coatings

Published: Mar 7, 2019

Author(s): Peter Visser, Herman Terryn, Johannes M.C. Mol

Journal: Surface and Interface Analysis

This study presents the active protective properties of lithium‐leaching coatings for a range of aluminium alloys. Coatings with and without lithium carbonate as leachable inhibitor were applied on the aluminium alloys, artificially damaged and exposed to the neutral salt spray. A combined approach of scanning electron microscopy and electrochemical measurements revealed that the lithium carbonate leaching coating provided effective corrosion inhibition on AA2024, AA7075, AA5083, and AA6014 by...

Read More thumbnail image: Active corrosion protection of various aluminium alloys by lithiumleaching coatings

The influence of cannabis smoke and cannabis vapour on simulated lung surfactant function under physiologically relevant conditions

Published: Mar 7, 2019

Author(s): Michael J. Davies, Jason W. Birkett, Hannah Bolton, Andrea Moore

Journal: Surface and Interface Analysis

The use of cannabis for medicinal/recreational purposes is widespread throughout the world. Smoke inhalation is known to cause airway irritation due to noxious substances (ie, benzene) within the mix. Thus, advanced vaporisation platforms (eg, Davinci IQ) have been developed to circumvent negative health implications. Here, we consider the impact that cannabis smoke and cannabis vapour have on simulated lung surfactant performance within a model pulmonary space (ie, 37°C, elevated humidity and...

Read More thumbnail image: The influence of cannabis smoke and cannabis vapour on simulated lung surfactant function under physiologically relevant conditions

The use and misuse of curve fitting in the analysis of core X‐ray photoelectron spectroscopic data

Published: Mar 7, 2019

Author(s): Peter M.A. Sherwood

Journal: Surface and Interface Analysis

Core X‐ray photoelectron spectroscopic (XPS) data often contain overlapping chemically shifted peaks that differ in their width, peak shape, and intensity. The spectra may be complicated by the presence of satellite and multiplet splitting features as well as from the X‐ray satellites that arise when achromatic X‐radiation is used. Curve fitting has been extensively used for more than the past 50 years as a means of extracting chemical information from the overlapping features in core XPS. Our...

Read More thumbnail image: The use and misuse of curve fitting in the analysis of core Xray photoelectron spectroscopic data

Single breath‐hold measurement of pulmonary gas exchange and diffusion in humans with hyperpolarized 129Xe MR

Published: Mar 7, 2019

Author(s): Junshuai Xie, Haidong Li, Huiting Zhang, Xiuchao Zhao, Lei Shi, Ming Zhang, Sa Xiao, He Deng, Ke Wang, Hao Yang, Xianping Sun, Guangyao Wu, Chaohui Ye, Xin Zhou

Journal: NMR in Biomedicine

Pulmonary diseases usually result in changes of the blood‐gas exchange function in the early stages. Gas exchange across the respiratory membrane and gas diffusion in the alveoli can be quantified using hyperpolarized 129Xe MR via chemical shift saturation recovery (CSSR) and diffusion‐weighted imaging (DWI), respectively. Generally, CSSR and DWI data have been collected in separate breaths in humans. Unfortunately, the lung inflation level cannot be the exactly same in different breaths,...

Read More thumbnail image: Single breathhold measurement of pulmonary gas exchange and diffusion in humans with hyperpolarized 129Xe MR

Stable isotope dilution assay for the accurate determination of tricaine in fish samples by HPLC–MS–MS

Published: Mar 6, 2019

Author(s): Chaonan Xie, Qin Li, Gang Han, Huan Liu, Jien Yang, Jincheng Li

Journal: Biomedical Chromatography

Abstract Tricaine methanesulfonate is one of most commonly used anesthetics in fish during blood sampling, artificial propagation and long‐distance transportation. In this study, an accurate method for the quantitative determination of tricaine in fish samples by a stable isotope dilution assay coupled with high‐performance liquid chromatography–triple quadrupole mass spectrometry was developed. Tricaine‐D5 was synthesized and used as an isotopically labeled internal standard for the...

Read More thumbnail image: Stable isotope dilution assay for the accurate determination of tricaine in fish samples by HPLCMSMS

Magnetic solid‐phase extraction of benzoylurea insecticides in tea samples with Fe3O4‐hyperbranched polyester magnetic composite as sorbent

Published: Mar 6, 2019

Author(s): Chaoran Liu, Xinya Liu, Philip J. Marriott, Heng Qian, Zilin Meng, Zhirong Yang, Runhua Lu, Haixiang Gao, Wenfeng Zhou

Journal: Journal of Separation Science

Abstract In this work, a method for the analysis of benzoylurea insecticides, including hexaflumuron, flufenoxuron, lufenuron and chlorfluazuron, in tea samples by high‐performance liquid chromatography with Fe3O4‐hyperbranched polyester nanocomposite as the adsorbent for magnetic solid‐phase extraction was developed. The magnetic nanocomposite was prepared and characterized by infrared spectroscopy, vibrating sample magnetometry, and scanning electron microscopy. The as‐prepared nanocomposite...

Read More thumbnail image: Magnetic solidphase extraction of benzoylurea insecticides in tea samples with Fe3O4hyperbranched polyester magnetic composite as sorbent

Application of characteristic fragment filtering with ultra high performance liquid chromatography coupled with high‐resolution mass spectrometry for comprehensive identification of components in Schisandrae chinensis Fructus

Published: Mar 6, 2019

Author(s): Chanjuan Yu, Yang Xu, Meiling Wang, Ziye Xie, Xiaoyan Gao

Journal: Journal of Separation Science

Abstract An integrated strategy of characteristic fragment filtering combined with target database screening based on ultra‐high‐performance liquid chromatography coupled with high‐resolution mass spectrometry was proposed for comprehensive profiling of components in Schisandrae chinensis Fructus. The strategy consisted of following five steps: (1) Representative standards were analyzed by ultra high performance liquid chromatography coupled with linear ion trap‐Orbitrap mass spectrometer for...

Read More thumbnail image: Application of characteristic fragment filtering with ultra high performance liquid chromatography coupled with highresolution mass spectrometry for comprehensive identification of components in Schisandrae chinensis Fructus

Investigation of dynamic accumulation and regularity of nine glycosides and saccharides in Rehmannia glutinosa by rapid quantitative analysis technology

Published: Mar 6, 2019

Author(s): Zhuo Xu, Xinxin Dai, Shulan Su, Hui Yan, Sheng Guo, Dawei Qian, Jin‐ao Duan

Journal: Journal of Separation Science

Abstract In the process of planting and harvesting of Rehmannia glutinosa, only the underground part is used, and a large number of stems and leaves that are considered non‐medicinal parts are usually discarded. Recent studies have shown that the chemical components in the leaves are similar to those identified in the roots. In this study, we selected leaves and roots from Rehmannia glutinosa at different growth stages and leaves from different cultivation regions to investigate the dynamic...

Read More thumbnail image: Investigation of dynamic accumulation and regularity of nine glycosides and saccharides in Rehmannia glutinosa by rapid quantitative analysis technology

Performance improvement of plasmonic sensors using a combination of AC electrokinetic effects for (bio)target capture

Published: Mar 6, 2019

Author(s): Quentin Avenas, Julien Moreau, Marion Costella, Arbi Maalaoui, Abdelkader Souifi, Paul Charette, Julien Marchalot, Marie Frénéa‐Robin, Michael Canva

Journal: ELECTROPHORESIS

Abstract Analytes concentration techniques are being developed with the appealing expectation to boost the performance of biosensors. One promising method lies in the use of electrokinetic forces. We present hereafter a new design for a microstructured plasmonic sensor which is obtained by conventional microfabrication techniques, and which can easily be adapted on a classical surface plasmon resonance imaging (SPRI) system without further significant modification. Dielectrophoretic trapping...

Read More thumbnail image: Performance improvement of plasmonic sensors using a combination of AC electrokinetic effects for biotarget capture

Investigating the effect of mono‐ and multivalent counterions on the conformation of poly(styrenesulfonic acid) by nanopores

Published: Mar 6, 2019

Author(s): Yating Zhao, Lei Liu, Yingfeng Tu, Hai‐Chen Wu

Journal: ELECTROPHORESIS

Abstract Polyelectrolytes are useful materials that have many technical, medical, physiological and biological applications. The properties of polyelectrolytes are determined not only by their chemical composition but also by their conformational states. However, the conformations of polyelectrolytes in solution are very difficult to characterize. Herein, we propose to use a protein nanopore to investigate the effect of mono‐ and multivalent counterions on the conformational changes of a...

Read More thumbnail image: Investigating the effect of mono and multivalent counterions on the conformation of polystyrenesulfonic acid by nanopores

Photochemical and photocatalytic degradation of 1‐propanol using UV/H2O2: Identification of malonate as byproduct

Published: Mar 6, 2019

Author(s): Mauro Sergio Ferreira Santos, Thiago Gomes Cordeiro, Zuzana Cieslarova, Ivano Gebhardt Rolf Gutz, Carlos D. Garcia

Journal: ELECTROPHORESIS

Abstract 1‐propanol is a primary alcohol extensively used in the pharmaceutical, chemical, and food industries. It has been also found as a contaminant in the atmosphere and is considered a model compound to mimic the behavior and fate of aliphatic alcohols exposed to environmental conditions. In order to understand that role of relevant variables, this paper presents results obtained with a simple experimental set‐up to investigate the reactivity of 1‐propanol under mild oxidizing conditions....

Read More thumbnail image: Photochemical and photocatalytic degradation of 1propanol using UVH2O2 Identification of malonate as byproduct

The effect of naringenin on the pharmacokinetics of ibrutinib in rat: A drug–drug interaction study

Published: Mar 6, 2019

Author(s): Jia Liu, Hanqing Liu, Qingqi Zeng

Journal: Biomedical Chromatography

Abstract The aim of this study was to investigate the effect of naringenin on the pharmacokinetics of ibrutinib in rats. A simple and sensitive quantitation method based on ultra‐high‐performance liquid chromatography–Q‐Exactive Orbitrap tandem mass spectrometry was developed and validated for the determination of ibrutinib in rat plasma. The samples were extracted using ethyl acetate containing 1% triethylamine and separated on a Waters Acquity UPLC BEH C18 column with acetonitrile and water...

Read More thumbnail image: The effect of naringenin on the pharmacokinetics of ibrutinib in rat A drugdrug interaction study

Preparation of a stoichiometric molecularly imprinted polymer for auramine O and application in solid‐phase extraction

Published: Mar 6, 2019

Author(s): Parezhati Pataer, Turghun Muhammad, Yunusjan Turahun, Wenwu Yang, Sailemayi Aihebaier, Muyasier Wubulikasimu, Lingxin Chen

Journal: Journal of Separation Science

Abstract We describe a stoichiometric approach to the synthesis of molecularly imprinted polymers specific for auramine O. Using the stoichiometric interaction in molecular imprinting, no excess of binding sites is necessary and binding sites are only located inside the imprinted cavities. The free base of the template was obtained to facilitate the interaction with the monomers. Itaconic acid was selected as the functional monomer, and stoichiometric ratio of the interaction with the free...

Read More thumbnail image: Preparation of a stoichiometric molecularly imprinted polymer for auramine O and application in solidphase extraction

Determination of residual solvents in isobutylboronic acid: Masking derivatization improves stability of GC column

Published: Mar 6, 2019

Author(s): Roman Papoušek, Stanislav Žák, Pavel Štverka, Aleš Gavenda, Lucie Borovcová, Petr Barták

Journal: Journal of Separation Science

Abstract Masking derivatization was introduced for the determination of residual solvents in samples containing a volatile reactive matrix component(s). Isobutylboronic acid, used in the last step of Bortezomib synthesis, represents a compound passing to the gas phase and deteriorating a chromatographic column during a headspace analysis. The masking derivatization with 1,8‐diaminonaphthalene allowed a simple and straightforward conversion of isobutylboronic acid to a stable nonvolatile...

Read More thumbnail image: Determination of residual solvents in isobutylboronic acid Masking derivatization improves stability of GC column

Inhomogeneous crystallization of a‐Si thin films irradiated by femtosecond laser

Published: Mar 5, 2019

Author(s): Dongyang Li, Nasir Ilyas, Yuhao Song, Hao Zhong, Wei Li, Yadong Jiang

Journal: Journal of Raman Spectroscopy

Abstract Recently, we have carried out a detailed Raman analysis to investigate the inhomogeneous crystallization of a‐Si thin films irradiated by femtosecond (Fs) laser. As expected, there are many etched spots overlapping each other, which features the surface morphology of the irradiated films. It is observed clearly that there has generated an inhomogeneous crystallization inside a‐Si thin film induced by Fs laser, and the crystalline volume fraction in one irradiated spot varies depending...

Read More thumbnail image: Inhomogeneous crystallization of aSi thin films irradiated by femtosecond laser
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