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Closure constraint in multivariate curve resolution

Published: Nov 23, 2017

Author(s): Nematollah Omidikia, Samira Beyramysoltan, Jamile Mohammad Jafari, Elnaz Tavakkoli, Mahsa Akbari Lakeh, Masoumeh Alinaghi, Mahdiyeh Ghaffari, Somaiyeh Khodadadi Karimvand, Róbert Rajkó, Hamid Abdollahi

Journal: Journal of Chemometrics

Abstract Multivariate curve resolution techniques try to estimate physically and/or chemically meaningful profiles underlying a set of chemical or related measurements. However, the estimation of profiles is not generally unique and it is often complicated by intensity and rotational ambiguities. Constraints as further information of chemical entities can be imposed to reduce the extent of ambiguities. Not only a long list of...

Read More thumbnail image: Closure constraint in multivariate curve resolution

ToF‐SIMS characterization of glyoxal surface oxidation products by hydrogen peroxide: A comparison between dry and liquid samples

Published: Nov 23, 2017

Author(s): Xiao Sui, Yufan Zhou, Fei Zhang, Yanyan Zhang, Jianmin Chen, Zihua Zhu, Xiao‐Ying Yu

Journal: Surface and Interface Analysis

As one of the simplest volatile organic compounds, glyoxal and its oxidation products were considered to be important precursors to aqueous secondary organic aerosol formation. Herein, we analyzed products from glyoxal oxidation by hydrogen peroxide in dry and liquid samples using time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS). ToF‐SIMS spectra and spectral principal component analysis (PCA) were used to investigate surface...

Read More thumbnail image: ToFSIMS characterization of glyoxal surface oxidation products by hydrogen peroxide A comparison between dry and liquid samples

Antibacterial and physicochemical properties of co‐sputtered CuSn thin films

Published: Nov 23, 2017

Author(s): Yujin Kang, Juyun Park, Dong‐Woo Kim, Hakjun Kim, Yong‐Cheol Kang

Journal: Surface and Interface Analysis

Copper‐tin thin films (CT TFs) were deposited on p‐type Si(100) by radio frequency (RF) magnetron co‐sputtering method. The atomic ratio of Cu and Sn showed complementary tendency with various RF powers on metal targets. Antibacterial test was conducted with Gram‐negative Escherichia coli. The ratio of Cu and Sn ions and the contact time with E. coli affected the antibacterial efficiency. Increasing the ratio of Cu ions and contact time showed...

Read More thumbnail image: Antibacterial and physicochemical properties of cosputtered CuSn thin films

Tungsten and nitrogen co‐doped TiO 2 nanobelts with significant visible light photoactivity

Published: Nov 23, 2017

Author(s): Hongjian Chen, Longxuan Wang, Lixiu Guan, Hui Ren, Yingxin Zhang, Junguang Tao

Journal: Surface and Interface Analysis

Tungsten and nitrogen co‐doped TiO2 nanobelts (W/N‐TNBs) have been successfully synthesized via 1‐step hydrothermal method. The structure, morphology, and composition of prepared samples were characterized by X‐ray diffraction, scanning electron microscopy, and X‐ray photoelectron spectroscopy, respectively. The prominent phase of all as‐prepared samples is anatase crystal. For samples with N doping, new energy states can be introduced on...

Read More thumbnail image: Tungsten and nitrogen codoped TiO 2 nanobelts with significant visible light photoactivity

Simultaneous separation and analysis of camptothecin alkaloids in real samples by large‐volume sample stacking in capillary electrophoresis

Published: Nov 22, 2017

Author(s): Meng Chen, Yayun Huang, Liying Xu, Hongfen Zhang, Guangbin Zhang, Anjia Chen

Journal: Biomedical Chromatography

Abstract Large‐volume sample stacking (LVSS) is commonly used as an effective online preconcentration method in capillary zone electrophoresis (CZE). In this paper, the method LVSS combined with CZE has been proposed to analyze camptothecin alkaloids. Optimum separation can be achieved in the following conditions: pH 9.0; 25mm borate buffer containing 20 mm sulfobutylether‐β‐cyclodextrin and 20 mm ionic liquid 1‐ethyl‐3‐methyllimidazole...

Read More thumbnail image: Simultaneous separation and analysis of camptothecin alkaloids in real samples by largevolume sample stacking in capillary electrophoresis

Preparation and evaluation of a chiral HPLC stationary phase based on cone calix[4]arene functionalized at the upper rim with l ‐alanine units

Published: Nov 22, 2017

Author(s): Sadegh Yaghoubnejad, Kourosh Tabar Heydar, Seyyed Hamid Ahmadi, Reza Zadmard

Journal: Biomedical Chromatography

Abstract Here we report a new chiral stationary phase (CSP) immobilized on silica gel based on cone calix[4]arene functionalized at the upper rim with two l‐alanine units as new chiral selector that has been used in high‐performance liquid chromatography. The CSP was prepared by covalently bonding the allyl groups at the lower rim of calix[4]arene to silica gel by thiol‐ene click chemistry reaction. Elemental analysis of the CSP...

Read More thumbnail image: Preparation and evaluation of a chiral HPLC stationary phase based on cone calix4arene functionalized at the upper rim with l alanine units

Comparison of plasma pharmacokinetics of Tanreqing solution between intratracheal aerosolization and intravenous injection in rats

Published: Nov 22, 2017

Author(s): Cui Li, Siyu Liu, Gan Luo, Guohua Wang, Baoxian Zhang, Qixia Nie

Journal: Biomedical Chromatography

Abstract A rapid ultra high performance liquid chromatography tandem mass spectrometry method was developed for the simultaneous analysis of baicalin, oroxylin A‐7‐O‐β‐d‐glucoronide and chlorogenic acid in rats plasma, and applied to comparison of pharmacokinetics of Tanreqing solution between intratracheal aerosolization and intravenous injection. Results of the analytical method validation assay showed high sensitivity, accuracy...

Read More thumbnail image: Comparison of plasma pharmacokinetics of Tanreqing solution between intratracheal aerosolization and intravenous injection in rats

A sensitive HPLC–MS/MS method for the simultaneous determination of anemoside B4, anemoside A3 and 23‐hydroxybetulinic acid: Application to the pharmacokinetics and liver distribution of Pulsatilla chinensis saponins

Published: Nov 22, 2017

Author(s): Xiaozhen Guo, Yang Xie, Shan Lian, Zhixiong Li, Yu Gao, Zhou Xu, Pei Hu, Mingcang Chen, Zhaolin Sun, Xiaoting Tian, Chenggang Huang

Journal: Biomedical Chromatography

Abstract Pulsatilla chinensis saponins, the major active components in the herb, have drawn great attention as potential hepatitis B virus infection and hepatoma treatments. Here, a sensitive and accurate HPLC–MS/MS method was established for simultaneous determination of three saponins – anemoside B4, anemoside A3 and 23‐hydroxybetulinic acid – in rat plasma and liver, and fully validated. The method was successfully applied to a...

Read More thumbnail image: A sensitive HPLCMSMS method for the simultaneous determination of anemoside B4 anemoside A3 and 23hydroxybetulinic acid Application to the pharmacokinetics and liver distribution of Pulsatilla chinensis saponins

Screening of analgesic and anti‐inflammatory active component in Fructus Alpiniae zerumbet based on spectrum–effect relationship and GC–MS

Published: Nov 22, 2017

Author(s): Rui‐Yao Xiao, Ling‐Jing Wu, Xiao‐Xiao Hong, Ling Tao, Peng Luo, Xiang‐Chun Shen

Journal: Biomedical Chromatography

Abastract Fructus Alpiniae zerumbet is widely used in Guizhou province as a miao folk herb with anti‐inflammatory, analgesic, protection against cardiovascular diseases, antihypertension and antioxidant activities. To further investigate the chemical material basis, the spectrum–effect relationship was established using gray relational analysis between the chromatographic fingerprint and its bioactivities. Herein, the fingerprints of essential...

Read More thumbnail image: Screening of analgesic and antiinflammatory active component in Fructus Alpiniae zerumbet based on spectrumeffect relationship and GCMS

Nanostructured gemini‐based supramolecular solvent coupled with ultrasound‐assisted back extraction as a preconcentration step before GC–MS

Published: Nov 22, 2017

Author(s): Neda Feizi, Yadollah Yamini, Morteza Moradi, Qamar Salamat

Journal: Journal of Separation Science

Abstract Liquid‐phase microextraction based on gemini‐based supramolecular solvent was successfully applied as a preconcentration step before gas chromatography with mass spectrometry. To eliminate the interferences of gemini surfactant, the analytes were back‐extracted into an immiscible organic solvent in the presence of ultrasonic sound waves. Three phthalate esters (di‐n‐butyl‐, butylbenzyl‐, bis(2‐ethylhexyl)‐, and di‐n‐octyl phthalatic...

Read More thumbnail image: Nanostructured geminibased supramolecular solvent coupled with ultrasoundassisted back extraction as a preconcentration step before GCMS

A sensitive LC–MS/MS method for simultaneous quantification of geniposide and its active metabolite genipin in rat plasma and its application to a pharmacokinetic study

Published: Nov 21, 2017

Author(s): Fuguo Shi, Hong Pan, Yi Li, Linyan Huang, Qin Wu, Yuanfu Lu

Journal: Biomedical Chromatography

Abstract Genipin (GP), an active metabolite of geniposide (GE), exhibits more potent pharmacological effects than its parent compound. In this paper, a sensitive LC‐MS/MS method was developed and fully validated for the simultaneous determination of GE and GP in rat plasma. We found that GP degraded rapidly in rat plasma at room temperature as a result of irreversible binding with the endogenous nucleophiles in plasma. GP was stable...

Read More thumbnail image: A sensitive LCMSMS method for simultaneous quantification of geniposide and its active metabolite genipin in rat plasma and its application to a pharmacokinetic study

Visualization of calcium phosphate cement in teeth by zero echo time 1 H MRI at high field

Published: Nov 21, 2017

Author(s): Weiqiang Dou, Simone Mastrogiacomo, Andor Veltien, Hamdan S. Alghamdi, X. Frank Walboomers, Arend Heerschap

Journal: NMR in Biomedicine

1H magnetic resonance imaging (MRI) by a zero echo time (ZTE) sequence is an excellent method to image teeth. Calcium phosphate cement (CPC) materials are applied in the restoration of tooth lesions, but it has not yet been investigated whether they can be detected by computed tomography (CT) or MRI. The aim of this study was to optimize high‐field ZTE imaging to enable the visualization of a new CPC formulation implanted in teeth and to...

Read More thumbnail image: Visualization of calcium phosphate cement in teeth by zero echo time 1 H MRI at high field

Transit time mapping in the mouse brain using time‐encoded pCASL

Published: Nov 21, 2017

Author(s): Lydiane Hirschler, Leon P. Munting, Artem Khmelinskii, Wouter M. Teeuwisse, Ernst Suidgeest, Jan M. Warnking, Louise Weerd, Emmanuel L. Barbier, Matthias J.P. Osch

Journal: NMR in Biomedicine

The cerebral blood flow (CBF) is a potential biomarker for neurological disease. However, the arterial transit time (ATT) of the labeled blood is known to potentially affect CBF quantification. Furthermore, ATT could be an interesting biomarker in itself, as it may reflect underlying macro‐ and microvascular pathologies. Currently, no optimized magnetic resonance imaging (MRI) sequence exists to measure ATT in mice. Recently, time‐encoded...

Read More thumbnail image: Transit time mapping in the mouse brain using timeencoded pCASL

Effects of electrothermal vortices on insulator‐based dielectrophoresis for circulating tumor cell separation

Published: Nov 20, 2017

Author(s): Arian Aghilinejad, Mohammad Aghaamoo, Xiaolin Chen, Jie Xu

Journal: ELECTROPHORESIS

Abstract Insulator‐based dielectrophoresis (iDEP) is a powerful technique for separation and manipulation of bioparticles. In recent years, iDEP designs using arrays of insulating posts have shown promising results toward reaching high‐efficiency bioparticle manipulation. Joule heating (JH) and electrothermal (ET) flows have been observed in iDEP microdevices and significantly affecting their performances. In this research, we...

Read More thumbnail image: Effects of electrothermal vortices on insulatorbased dielectrophoresis for circulating tumor cell separation

Addition of urea and thiourea to electrophoresis sample buffer improves efficiency of protein extraction from TCA/acetone‐treated smooth muscle tissues for phos‐tag SDS‐PAGE

Published: Nov 20, 2017

Author(s): Kosuke Takeya, Toshiyuki Kaneko, Motoi Miyazu, Akira Takai

Journal: ELECTROPHORESIS

Abstract Phosphorylation analysis by using phos‐tag technique has been reported to be suitable for highly sensitive quantification of smooth muscle myosin regulatory light chain (LC20) phosphorylation. However, there is another factor that will affect the sensitivity of phosphorylation analysis, that is, protein extraction. Here, we optimized the conditions for total protein extraction out of trichloroacetic acid (TCA)‐fixed ...

Read More thumbnail image: Addition of urea and thiourea to electrophoresis sample buffer improves efficiency of protein extraction from TCAacetonetreated smooth muscle tissues for phostag SDSPAGE

Raman scattering studies of graphene under high pressure

Published: Nov 20, 2017

Author(s): Denis Machon, Colin Bousige, Rafael Alencar, Abraao Torres‐Dias, Félix Balima, Jimmy Nicolle, Gardênia Sousa Pinheiro, Antonio Gomes Souza Filho, Alfonso San‐Miguel

Journal: Journal of Raman Spectroscopy

The effect of pressure – by definition a 3‐dimensional concept – on 2‐dimensional systems brings a number of fundamental questions, which have been partly answered through newly engineered samples and experimental setups. In this review of the high‐pressure Raman studies of graphene, we will in particular underline the importance of the presence of a supporting substrate and its role for the production of biaxial strain conditions in high...

Read More thumbnail image: Raman scattering studies of graphene under high pressure

Diagnostics of sintering processes on the basis of PCA and two‐level neural network model

Published: Nov 20, 2017

Author(s): E.G. Egorova, I.V. Rudakova, L.A. Rusinov, N.V. Vorobjev

Journal: Journal of Chemometrics

Abstract The application of chemometrics methods to continuous monitoring and diagnostics of sintering process faults for improving iron‐ore sinter quality is considered in the article. The sintering process is among complex multivariate processes. A number of agglomeration process faults have often similar symptoms, resulting in late fault detection by an operator and as a consequence, wrong process control...

Read More thumbnail image: Diagnostics of sintering processes on the basis of PCA and twolevel neural network model

Sol–gel/nanoclay composite as a sorbent for microextraction in packed syringe combined with corona discharge ionization ion mobility spectrometry for the determination of diazinon in water samples

Published: Nov 20, 2017

Author(s): Mohammad Saraji, Mohammad Taghi Jafari, Mohammad Mehdi Amooshahi

Journal: Journal of Separation Science

Abstract In this work, the microextraction in packed syringe technique combined with corona discharge ion mobility spectrometry was used for determining diazinon in water samples. A new porous composite of nanoclay and polysiloxane was prepared using a sol–gel process. An amount of 2.0 mg of the sorbent was packed in a 250 μL syringe and used for extraction. A volume of 2 mL of the sample was passed through the sorbent...

Read More thumbnail image: Solgelnanoclay composite as a sorbent for microextraction in packed syringe combined with corona discharge ionization ion mobility spectrometry for the determination of diazinon in water samples

Spectroscopic characterization of historical building materials: The case study of the Biblioteca Nazionale Marciana (Venice, Italy)

Published: Nov 20, 2017

Author(s): Giulia Carolina Lodi, Lavinia De Ferri, Giulio Pojana

Journal: Journal of Raman Spectroscopy

Abstract The building designed by Sansovino in 1532 as the new Mint of Venice underwent a change in its intended use, becoming in 1900 the Biblioteca Nazionale Marciana. A spectroscopic study concerning the surface stone materials of the current reading room (previously a courtyard) was attempted since the transformation lead to heavy micro‐ and macroclimatic variations. Many alterations were observed, such as...

Read More thumbnail image: Spectroscopic characterization of historical building materials The case study of the Biblioteca Nazionale Marciana Venice Italy

Comparative Proteomic Analysis of Three Xanthomonas spp. Cultured in Minimal and Rich Media

Published: Nov 20, 2017

Author(s): Hye‐Jee Park, Nahee Bae, Hanbi Park, Dae‐Wi Kim, Sang‐Wook Han

Journal: PROTEOMICS

Abstract Bacteria change their gene expression when exposed to different nutrient conditions. The levels of proteins do not always correlate with those of RNAs, hence proteomic analysis is required for understanding how bacteria adapt to different conditions. Herein, differentially abundant proteins from Xanthomonas oryzae pv. oryzae (Xoo), X. campestris pv. vesicatoria (Xcv), and X. axonopodis pv. glycines (Xag), which were cultured in rich...

Read More thumbnail image: Comparative Proteomic Analysis of Three Xanthomonas spp_ Cultured in Minimal and Rich Media
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