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Real‐time Raman analysis of cleaning solution: Determination of Al/Alq3 residue in cleaning mixture

Published: Jan 4, 2019

Author(s): Yinhua Cui, Ho Jae Shim, Yuan Gao, Sung Gyu Pyo

Journal: Journal of Raman Spectroscopy

Abstract The analysis of cleaning solutions is difficult, especially if a chemical reaction occurs in the mixed solution. Such chemical reactions lead to real‐time changes in the vibrations of the molecules due to changes in the binding forces. Thus, techniques for analyzing mixed solutions are required to determine the processes that occur during the cleaning process. A real‐time intermolecular vibrational analysis method employing...

Read More thumbnail image: Realtime Raman analysis of cleaning solution Determination of AlAlq3 residue in cleaning mixture

Compact high‐sensitivity symmetrical integrated optical system for the detection of Raman scattering with dual channels

Published: Jan 4, 2019

Author(s): Xian‐guang Fan, Jun Chen, Xin Wang

Journal: Journal of Raman Spectroscopy

Abstract We present here a compact symmetrical integrated optical system for the high‐sensitivity handheld Raman spectrometer. This symmetric optical system is of higher sensitivity of Raman spectrum detection by coupling collection optics to the spectrometer directly, reflecting excitation laser incident at 45° while efficiently passing the longer Raman‐shift wavelength with two long‐pass dichroic laser‐flat beam‐splitters placed...

Read More thumbnail image: Compact highsensitivity symmetrical integrated optical system for the detection of Raman scattering with dual channels

Scrutinizing Ecce Homo : European or Indian painting? Assessment by Raman and complementary spectroscopic techniques

Published: Jan 4, 2019

Author(s): Vanessa Antunes, Vitor Serrão, António Candeias, José Mirão, Ana Cardoso, Maria L. Carvalho, Natasha Fernandes, Marta Manso

Journal: Journal of Raman Spectroscopy

Abstract This work intends to characterize producing techniques and materials used in Ecce Homo painting (P1) from the beginning of the 17th century, made at the time of Iberian Union government in Goa, which belongs to Museum of Christian Art at Old Goa (India). Determination of the manufacturing processes, material characterization of ground/priming layer, and pigment layers were the scopes of this study. ...

Read More thumbnail image: Scrutinizing Ecce Homo  European or Indian painting Assessment by Raman and complementary spectroscopic techniques

Phase transformations of bovine serum albumin: Evidences from Rayleigh‐Brillouin light scattering

Published: Jan 4, 2019

Author(s): A.V. Dmitriev, V.E. Vashchenkov, A.I. Fedoseev, S.G. Lushnikov

Journal: Journal of Raman Spectroscopy

Abstract Rayleigh‐Brillouin light‐scattering studies of a high‐concentration solution of bovine serum albumin (BSA, pH = 7.45, C = 100 mg/ml) in a sodium phosphate buffer in the temperature range 300–370 K are presented. It is shown that the temperature dependences of relative changes in the Brillouin shift and half width at half maximum and intensity of the Brillouin doublet and intensity of Rayleigh...

Read More thumbnail image: Phase transformations of bovine serum albumin Evidences from RayleighBrillouin light scattering

Electronic Raman scattering as a probe for investigating interactions between impurities in silicon

Published: Jan 4, 2019

Author(s): N. Stavrias, P.G. Spizzirri, S. Prawer

Journal: Journal of Raman Spectroscopy

Abstract Electronic Raman scattering (ERS) is investigated as a probe for interactions between impurities in silicon. We report ERS measurements of donors (P, Sb, and As) and acceptors (B) at various concentrations and measurements at various illumination wavelengths. The difference between above and below indirect band gap measurement is discussed in terms of the difficulties of using ERS as a localised probe. We extend the...

Read More thumbnail image: Electronic Raman scattering as a probe for investigating interactions between impurities in silicon

Understanding flow enhancement in graphene‐coated nanochannels

Published: Jan 4, 2019

Author(s): Yakang Jin, Ran Tao, Zhigang Li

Journal: ELECTROPHORESIS

Abstract In this work, we investigate pressure‐driven water flows in graphene‐coated copper nanochannels through molecular dynamics simulations. It is found that the flow rate in bare copper nanochannel can be significantly enhanced by a factor of 45 when the nanochannel is coated with monolayer graphene. The enhancement factor for the flow rate reaches about 90 when the nanochannel is modified with 3 or more graphene layers. The...

Read More thumbnail image: Understanding flow enhancement in graphenecoated nanochannels

A rapid site‐specific PCR based one‐tube authentication method for saffron in crude drugs and processed herbal medicines

Published: Jan 4, 2019

Author(s): Yi Yuan, Yun Deng, Jian Wang, Rong Chen

Journal: ELECTROPHORESIS

Abstract Saffron is one of the world's most precious medicinal herbs and often found to be adulterated with other cheaper materials. The chemical compounds in Crocus sativus L. such as crocin, picrocrocin also exist in other plants, which makes the chemotype‐driven analysis not ideal for the quality control of saffron. Herein, we developed a rapid authentication method for saffron in crude drugs by the site‐specific PCR. In order to...

Read More thumbnail image: A rapid sitespecific PCR based onetube authentication method for saffron in crude drugs and processed herbal medicines

Increasing the amount of phosphoric acid enhances the suitability of Bradford assay for proteomic research

Published: Jan 4, 2019

Author(s): Weitong Cui, Huaru Xue, Hongda Cheng, Haibin Zhang, Jinghua Jin, Qinglu Wang

Journal: ELECTROPHORESIS

Abstract The Bradford assay is one of the most commonly used methods for protein quantification. However, in proteomic research, the lysis buffer generally used for dissolving proteins can cause some interference to the assay. The dye reagent of classical Bradford assay contains 8.50% (w/v) phosphoric acid, which is an important factor relating to the color yield of the assay. In this study, the phosphoric acid content in dye...

Read More thumbnail image: Increasing the amount of phosphoric acid enhances the suitability of Bradford assay for proteomic research

Counterflow gradient electrophoresis for focusing and elution

Published: Jan 4, 2019

Author(s): Matthew Courtney, Carolyn L. Ren

Journal: ELECTROPHORESIS

Abstract Counterflow gradient electrofocusing uses the bulk flow of a liquid solution to counterbalance the electrophoretic migration of an analyte. When either the bulk velocity or the electrophoretic velocity of the analyte is made to vary across the length of the channel, there exists a unique zero‐velocity point for the analyte. This focusing method enables simultaneous separation and concentration of different analytes. The...

Read More thumbnail image: Counterflow gradient electrophoresis for focusing and elution

Evaluation of the microhaplotype markers in kinship analysis

Published: Jan 4, 2019

Author(s): Jing Zhu, Peng Chen, Shengqiu Qu, Yinji Wang, Hui Jian, Shuqiang Cao, Yuqing Liu, Ranran Zhang, Meili Lv, Weibo Liang, Lin Zhang

Journal: ELECTROPHORESIS

Abstract Microhaplotype markers are emerging forensic genetic markers, which may supplement existing markers. Consisting of two to four SNPs with an extent of <200 bp, microhaplotype can be genotyped through massively parallel sequencing technology. Articles that have been published suggested that microhaplotype markers have good application prospect in forensics. Multiallelic haplotype loci are potentially important in certain...

Read More thumbnail image: Evaluation of the microhaplotype markers in kinship analysis

Microfluidic based impedance biosensor for pathogens detection in food products

Published: Jan 4, 2019

Author(s): Amjed Abdullah, Shibajyoti Ghosh Dastider, Ibrahem Jasim, Zhenyu Shen, Nuh Yuksek, Shuping Zhang, Majed Dweik, Mahmoud Almasri

Journal: ELECTROPHORESIS

Abstract A MEMS‐based impedance biosensor was designed, fabricated, and tested to effectively detect the presence of bacterial cells including E. coli O157:H7 and Salmonella typhimurium in raw chicken products using detection region made of multiple interdigitated electrode arrays. A positive dielectrophoresis based focusing electrode was used in order to focus and concentrate the bacterial cells at the centerline of the fluidic...

Read More thumbnail image: Microfluidic based impedance biosensor for pathogens detection in food products

Monitoring phase transition of aqueous biomass model substrates by high‐pressure and high‐temperature microfluidics

Published: Jan 4, 2019

Author(s): Renée M. Ripken, Stefan Schlautmann, Remco G.P. Sanders, Johannes G.E. Gardeniers, Séverine Le Gac

Journal: ELECTROPHORESIS

Abstract Aqueous‐Phase Reforming (APR) is a promising hydrogen production method, where biomass is catalytically reformed under high pressure and high temperature reaction conditions. To eventually study APR, in this paper, we report a high‐pressure and high‐temperature microfluidic platform that can withstand temperatures up to 200°C and pressures up to 30 bar. As a first step, we studied the phase transition of four typical APR...

Read More thumbnail image: Monitoring phase transition of aqueous biomass model substrates by highpressure and hightemperature microfluidics

In‐line coupling of supported liquid membrane extraction across nanofibrous membrane to capillary electrophoresis for analysis of basic drugs from undiluted body fluids

Published: Jan 4, 2019

Author(s): Miloš Dvořák, Pavel Kubáň

Journal: ELECTROPHORESIS

Abstract Planar polyamide 6 nanofibrous membrane was for the first time used in direct coupling of supported liquid membrane (SLM) extraction to CE analysis. Disposable microextraction device with the nanofibrous membrane was preassembled and stored for immediate use. The membrane in the device was impregnated with 1 μL of 1‐ethyl‐2‐nitrobenzene and the device was subsequently filled with 10 μL of acceptor solution (10 mM HCl) and...

Read More thumbnail image: Inline coupling of supported liquid membrane extraction across nanofibrous membrane to capillary electrophoresis for analysis of basic drugs from undiluted body fluids

A numerical study on viscoelastic droplet migration on a solid substrate due to wettability gradient

Published: Jan 4, 2019

Author(s): Fan Bai, Yuke Li, Hongna Zhang, Sang Woo Joo

Journal: ELECTROPHORESIS

Abstract This study investigates the viscoelastic effects on droplet migration induced by a wettability gradient on a rigid substrate by a numerical simulation based on OpenFOAM with the volume‐of‐fluid method. The droplets are set with different rheological properties to investigate the effect of the elastic parameters. The Oldroyd‐B model was employed. Quantitative differences in the migration and deformation between Newtonian and...

Read More thumbnail image: A numerical study on viscoelastic droplet migration on a solid substrate due to wettability gradient

Increased dwell time and occurrence of dsDNA translocation events through solid state nanopores by LiCl concentration gradients

Published: Jan 4, 2019

Author(s): Julian Bello, Maksudul Mowla, Nicholas Troise, Joanna Soyring, Julia Borgesi, Jiwook Shim

Journal: ELECTROPHORESIS

Abstract Solid‐state nanopore based biosensors are cost effective, high‐throughput engines for single molecule detection of biomolecules with the added benefit of size modification. Progress in the translation of the science into a viable diagnostic tool is impeded by inadequate sensitivity of data acquisition systems in detection of fast DNA translocations through the pore. To combat this, slowing the transport of DNA through the...

Read More thumbnail image: Increased dwell time and occurrence of dsDNA translocation events through solid state nanopores by LiCl concentration gradients

Generalized model of the linear theory of electromigration and its application to electrokinetic chromatography: Theory and software PeakMaster 6—Next Generation

Published: Jan 4, 2019

Author(s): Michal Malý, Magda Dovhunová, Martin Dvořák, Gabriel S. Gerlero, Pablo A. Kler, Vlastimil Hruška, Pavel Dubský

Journal: ELECTROPHORESIS

Abstract The linear theory of electromigration, including the first‐order nonlinear approximation, is generalized to systems with any equilibria fast enough to be considered instantaneous in comparison with the timescale of peak movement. For example, this theory is practically applied in the electrokinetic chromatography (EKC) mode of the CZE. The model enables the calculation of positions and shapes of analyte and system peaks...

Read More thumbnail image: Generalized model of the linear theory of electromigration and its application to electrokinetic chromatography Theory and software PeakMaster 6Next Generation

Heart‐cut nano‐LC–CZE–MS for the characterization of proteins on the intact level

Published: Jan 4, 2019

Author(s): Kevin Jooß, Nico Scholz, Jens Meixner, Christian Neusüß

Journal: ELECTROPHORESIS

Abstract Multidimensional separation techniques play an increasingly important role in separation science, especially for the analysis of complex samples such as proteins. The combination of reversed‐phase liquid chromatography in the nanoscale and CZE is especially beneficial due to their nearly orthogonal separation mechanism and well‐suited geometries/dimensions. Here, a heart‐cut nano‐LC–CZE–MS setup was developed utilizing for...

Read More thumbnail image: Heartcut nanoLCCZEMS for the characterization of proteins on the intact level

Urinary concentrations of AICAR and mannitol in athlete population

Published: Jan 4, 2019

Author(s): Tim Sobolevsky, Brian Ahrens

Journal: Drug Testing and Analysis

Abstract Both AICAR and mannitol are prohibited for use in sports, but no decisive criteria that would guide anti‐doping laboratories on data interpretation have been established so far. In an attempt to help harmonize reporting and management of analytical findings, reference population data collected for US athletes are presented. Upon analysis of 12 377 samples, mean urinary AICAR concentration was found to be...

Read More thumbnail image: Urinary concentrations of AICAR and mannitol in athlete population

Oncogenic Regulation of Extracellular Vesicle Proteome and Heterogeneity

Published: Jan 4, 2019

Author(s): Dongsic Choi, Cristiana Spinelli, Laura Montermini, Janusz Rak

Journal: PROTEOMICS

Abstract Mutational and epigenetic driver events profoundly alter intercellular communication pathways in cancer. This effect includes deregulated release, molecular composition, and biological activity of extracellular vesicles (EVs), membranous cellular fragments ranging from a few microns to less than 100 nm in diameter and filled with bioactive molecular cargo (proteins, lipids, and nucleic acids). While EVs are usually...

Read More thumbnail image: Oncogenic Regulation of Extracellular Vesicle Proteome and Heterogeneity

Proteomic Signature of Mesenchymal Stromal Cell‐Derived Small Extracellular Vesicles

Published: Jan 4, 2019

Author(s): Bas W. M. Balkom, Hendrik Gremmels, Bernd Giebel, Sai Kiang Lim

Journal: PROTEOMICS

Abstract Small extracellular vesicles (EVs) are 50–200 nm vesicles secreted by most cells. They are considered as mediators of intercellular communication, and EVs from specific cell types, in particular mesenchymal stem/stromal cells (MSCs), offer powerful therapeutic potential, and can provide a novel therapeutic strategy. They appear promising and safe (as EVs are non‐self‐replicating), and eventually MSC‐derived EVs (MSC‐EVs)...

Read More thumbnail image: Proteomic Signature of Mesenchymal Stromal CellDerived Small Extracellular Vesicles
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