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Simultaneous determination of residues of thiamethoxam and its metabolite clothianidin in tobacco leaf and soil using liquid chromatography‐tandem mass spectrometry

Published: Mar 25, 2018

Author(s): Banghua Meng, Yurong Yu, Qingtao Zhang, Shouyi Wang, Deyu Hu, Kankan Zhang

Journal: Biomedical Chromatography

Abstract A simple analytical method was developed to simultaneously determine thiamethoxam and its metabolite, clothianidin, in fresh tobacco leaf, soil and cured tobacco leaf using liquid chromatography with tandem mass spectrometry. Thiamethoxam and clothianidin in tobacco and soil samples were extracted with acetonitrile containing 0.1% formic acid and purified using an NH2‐SPE column. The optimized method provided good linearity with...

Read More thumbnail image: Simultaneous determination of residues of thiamethoxam and its metabolite clothianidin in tobacco leaf and soil using liquid chromatographytandem mass spectrometry

Monitoring pesticide residues in dates marketed in Al‐Qassim, Saudi Arabia using a QuEChERS methodology and liquid chromatography–tandem mass spectrometry

Published: Mar 25, 2018

Author(s): Osama I. Abdallah, Saleh S. Alamer, Abdulmajeed M. Alrasheed

Journal: Biomedical Chromatography

Abstract A sensitive, simple and rapid QuEChERS extraction method and liquid chromatography equipped with triple quadrupole mass spectrometry (LC‐MS/MS) were used to determine 42 pesticides in dates. Acidified acetonitrile and citrate buffer salts were used to extract re‐hydrated samples. Acceptable validation performances were achieved, i.e. recovery range of 70−120% and RSD values ≤20% for 42 analytes at three different...

Read More thumbnail image: Monitoring pesticide residues in dates marketed in AlQassim Saudi Arabia using a QuEChERS methodology and liquid chromatographytandem mass spectrometry

Simple model of coherent anti‐Stokes Raman scattering signals generated by means of linearly chirped ultrashort Gaussian laser pulses

Published: Mar 24, 2018

Author(s): M. Marrocco

Journal: Journal of Raman Spectroscopy

Abstract Time and frequency dependences of coherent anti‐Stokes Raman scattering (CARS) are here found analytically for the increasingly popular experimental approach where the Raman preparation and probing are realized by means of very short linearly chirped laser pulses. These are chosen with Gaussian lineshapes that, besides being rather common in ultrashort laser physics, guarantee full solution to the nonlinear scattering...

Read More thumbnail image: Simple model of coherent antiStokes Raman scattering signals generated by means of linearly chirped ultrashort Gaussian laser pulses

Chemical behavior of croconic acid coordinated to Co(II) adsorbed on silver surface

Published: Mar 24, 2018

Author(s): Erix A. Milán‐Garcés, Stéfanos Leite Georgopoulos, Antonio Carlos Sant'Ana, Gustavo F.S. Andrade, Luiz Fernando Cappa Oliveira

Journal: Journal of Raman Spectroscopy

Abstract The vibrational properties of croconic acid (CA), the associated anionic specie croconate (CR), and their complexes with the transition metals Co(II) were investigated through surface‐enhanced Raman scattering (SERS) spectroscopy. This is the first time the SERS spectra of CA and CR are reported. The normal Raman spectrum of CA after the addition of Co(II) was similar to the corresponding spectrum of CR in the presence of...

Read More thumbnail image: Chemical behavior of croconic acid coordinated to CoII adsorbed on silver surface

Comparison of the chromatographic fingerprint, multicomponent quantitation and antioxidant activity of Salvia miltiorrhiza Bge. between sweating and nonsweating

Published: Mar 23, 2018

Author(s): Guozhuan Li, Fan Yu, Yanyan Wang, Liang Yao, Zhen Qiu, Ting Wang, Zhiqiang Wang, Fanglin Yang, Daiyin Peng, Nianjun Yu, Weidong Chen

Journal: Biomedical Chromatography

Abstract Salvia miltiorrhiza Bge. is a traditional Chinese medicine applied in the treatment of various diseases in clinical practice. In the course of its processing, S. miltiorrhiza Bge. is usually processed by sweating. This study employed 10‐component contents determination coupled with high‐performance liquid chromatography (HPLC) fingerprint and antioxidant activity to investigate the effect of sweating on S. miltiorrhiza Bge. so as to...

Read More thumbnail image: Comparison of the chromatographic fingerprint multicomponent quantitation and antioxidant activity of Salvia miltiorrhiza Bge_ between sweating and nonsweating

Simultaneous measurement of NAD metabolome in aged mice tissue using liquid chromatography tandem‐mass spectrometry

Published: Mar 23, 2018

Author(s): Keisuke Yaku, Keisuke Okabe, Takashi Nakagawa

Journal: Biomedical Chromatography

Abstract Nicotinamide adenine dinucleotide (NAD) is a major co‐factor that mediates multiple biological processes including redox reaction and gene expression. Recently, NAD metabolism has received considerable attention because administration of NAD precursors exhibited beneficial effects against aging‐related metabolic disorders in animals. Although numerous studies have reported that NAD levels decline with aging in multiple...

Read More thumbnail image: Simultaneous measurement of NAD metabolome in aged mice tissue using liquid chromatography tandemmass spectrometry

A quantitative LC/MSMS method for determination of edoxaban, a Xa inhibitor and its pharmacokinetic application in patients after total knee arthroplasty

Published: Mar 23, 2018

Author(s): Kazuhiko Hanada, Shin‐ichi Matsumoto, Soichi Shibata, Hajime Matsubara, Yasunori Tsukimura, Harumi Takahashi

Journal: Biomedical Chromatography

Abstract Edoxaban was extracted from human plasma by simple protein precipitation with acetonitrile, followed by quantitative determination using a liquid chromatography–mass spectrometry method. The recoveries of edoxaban and the internal standard (ticlopidine) from human plasma were >85%, and the within‐ and between‐day coefficients of variation were within 15%. The limit of quantification in human plasma was 1 ng/mL. The...

Read More thumbnail image: A quantitative LCMSMS method for determination of edoxaban a Xa inhibitor and its pharmacokinetic application in patients after total knee arthroplasty

β‐Cyclodextrin‐modified three‐dimensional graphene oxide‐wrapped melamine foam for the solid‐phase extraction of flavonoids

Published: Mar 23, 2018

Author(s): Xiudan Hou, Xiaofeng Lu, Panhong Niu, Sheng Tang, Licheng Wang, Yong Guo

Journal: Journal of Separation Science

Abstract A new three‐dimensional graphene oxide‐wrapped melamine foam was prepared and used as a solid‐phase extraction substrate. β‐Cyclodextrin was fabricated onto the surface of three‐dimensional graphene oxide‐wrapped melamine foam by a chemical covalent interaction. In view of a specific surface area and a large delocalized π electron system of graphene oxide, in combination with a hydrophobic interior cavity and a hydrophilic...

Read More thumbnail image: Cyclodextrinmodified threedimensional graphene oxidewrapped melamine foam for the solidphase extraction of flavonoids

Polytetrafluoroethylene tape as a low‐cost hydrophobic substrate for drop‐coating deposition Raman spectroscopy of proteins

Published: Mar 23, 2018

Author(s): James Smith, Heike Arnolds

Journal: Journal of Raman Spectroscopy

Abstract Highly hydrophobic substrates are desirable for drop coating deposition Raman spectroscopy of proteins, because they concentrate the analyte during drying. Most of the commercial substrates used to date are comparatively expensive, whereas thiol or silane functionalisation of surfaces requires a degree of experience not available in a typical biology laboratory. Here, we show that polytetrafluoroethylene tape, commercially...

Read More thumbnail image: Polytetrafluoroethylene tape as a lowcost hydrophobic substrate for dropcoating deposition Raman spectroscopy of proteins

Raman spectroscopic study of six synthetic anhydrous sulfates relevant to the mineralogy of fumaroles

Published: Mar 23, 2018

Author(s): F. Košek, A. Culka, J. Jehlička

Journal: Journal of Raman Spectroscopy

Abstract Fumaroles, vents that emit hot gases and vapor, are an accompanying phenomenon of volcanic activity. Such phenomena are also observed within the framework of self‐ignited burning coal seams and coal heap fires, if less commonly. The high temperatures and chemical reactions between the gas and solid phases are responsible for extensive alteration of surrounding rocks, resulting in mineral encrustations of unusual...

Read More thumbnail image: Raman spectroscopic study of six synthetic anhydrous sulfates relevant to the mineralogy of fumaroles

Broadband noncollinear optical parametric amplification under low‐frequency picosecond pump in homogeneous KTP crystal

Published: Mar 23, 2018

Author(s): K.A. Vereshchagin, V.B. Morozov, V.G. Tunkin

Journal: Journal of Raman Spectroscopy

Abstract The nature of cubic and cascaded quadratic nonlinear responses in the KTiOPO4 crystal under picosecond pump is studied. The main attention is paid to determination of the origin and properties of the blue radiation accompanying the red light amplification process (the central wavelength ~685 nm, bandwidth ~20 nm) in a noncollinear optical parametric amplifier (NOPA) pumped by the second‐harmonic radiation of the picosecond...

Read More thumbnail image: Broadband noncollinear optical parametric amplification under lowfrequency picosecond pump in homogeneous KTP crystal

Reduction of graphene oxide by UHV annealing

Published: Mar 23, 2018

Author(s): S. Kaciulis, A. Mezzi, P. Soltani, T. Caro, H. Xia, Y.L. Wang, T. Zhai, M. Lavorgna

Journal: Surface and Interface Analysis

A series of chemically treated graphene oxide (GO) samples, destined for the preparation of several composite materials, was studied by X‐ray photoelectron spectroscopy (XPS). From their comparison, the 3‐mercaptopropyl trimethoxysilane was identified as the most effective reducing agent among the used procedures. The influence of ultrahigh vacuum annealing up to 600°C on the chemical composition and carbon electronic configuration in...

Read More thumbnail image: Reduction of graphene oxide by UHV annealing

Surface analysis: From single crystals to biomaterials

Published: Mar 23, 2018

Author(s): David G. Castner

Journal: Surface and Interface Analysis

Surfaces and interfaces play a critical role in material performance in many applications including catalysis, biomaterials, microelectronics, tribology, and adhesion. Characterizing the important surfaces and interfaces involved in each application may present different challenges, but the approach to investigating them often is rather similar. Specialized instrumentation is typically used to probe the surface region of a material, and...

Read More thumbnail image: Surface analysis From single crystals to biomaterials

Oxidative treatment effect on TiH 2 powders

Published: Mar 23, 2018

Author(s): S. Kaciulis, P. Soltani, A. Mezzi, R. Montanari, G. Lapi, M. Richetta, A. Varone, G. Barbieri

Journal: Surface and Interface Analysis

Titanium hydride (TiH2) is a brittle powder, which is highly reactive when exposed to heat or strong oxidizers. Namely due to its high reactivity, TiH2 powder is widely applied in pyrotechnics, initiator squibs, and igniters. All the industrial applications of TiH2 are based on its decomposition and consequent hydrogen release. The surface of TiH2 powders has been analysed after different heat treatments in air realized by...

Read More thumbnail image: Oxidative treatment effect on TiH 2 powders

XPS study of structural transformations in some Ni complexes

Published: Mar 23, 2018

Author(s): A. Naumkin, T. Ivanova, A. Sidorov, K. Maslakov, M. Kiskin, S. Savilov, V. Lunin, V. Novotortsev, I. Eremenko

Journal: Surface and Interface Analysis

X‐ray photoelectron spectroscopy investigations of Ni(LCH3)3(Piv)2 (1), [Ni(LCH3)2]2(Piv)2) (2), and [Ni(LCH3)2]2(CH3COO)2] (3) complexes, where LCH3—k2‐1,2‐diamino‐4,5‐dimethylbenzene‐bis(k1‐diamino‐4,5‐dimethylbenzene) and Piv—(CH3)3CCOO, are reported and discussed. The photoelectron spectra are sensitive to the temperature of the samples and evidence on structural conformations.

Read More thumbnail image: XPS study of structural transformations in some Ni complexes

Surface analytical characterization of LiNi 0.8‐y Mn y Co 0.2 O 2 (0 ≤  y  ≤ 0.4) compounds for lithium‐ion battery electrodes

Published: Mar 23, 2018

Author(s): R. Azmi, M. Masoumi, H. Ehrenberg, V. Trouillet, M. Bruns

Journal: Surface and Interface Analysis

This study presents the quantitative chemical state elucidation of newly developed LiNi0.8‐yMnyCo0.2O2 (0 ≤ y ≤ 0.4) cathode materials for Li‐ion batteries utilizing X‐ray photoelectron spectroscopy. For reliable quantification of the chemical states of the transition metals, namely Mn, Co, and Ni, in particular, the complex peak structures consisting of significant photoelectron multiplet splitting, shake‐up satellites, and...

Read More thumbnail image: Surface analytical characterization of LiNi 0_8y Mn y Co 0_2 O 2 0 y 0_4 compounds for lithiumion battery electrodes

Surface phenomena during the early stage of liquid phase SPS of a mixture of coarse WC and Ni‐alloy particles

Published: Mar 23, 2018

Author(s): G. Maizza, R. Montanari, M. Richetta, A. Varone, S. Kaciulis, A. Mezzi, P. Soltani

Journal: Surface and Interface Analysis

The tool industry strongly demands more economical, high‐performance, healthy, and ecological Co‐free WC‐based composites. Nickel is considered the optimal substitute of Co in WC‐based cermets to attain nearly comparable, if not superior properties in terms of wear resistance and fracture toughness. The combination of WC‐Ni with spark plasma sintering (SPS) process may represent a key factor to enhance the properties of future WC‐Ni...

Read More thumbnail image: Surface phenomena during the early stage of liquid phase SPS of a mixture of coarse WC and Nialloy particles

Relative sensitivity factors in hard X‐ray photoelectron spectroscopy

Published: Mar 23, 2018

Author(s): Satoshi Yasuno, Satoshi Ishimaru, Norihiro Ikeno

Journal: Surface and Interface Analysis

Empirical relative sensitivity factors (RSFs) for the 1s, 2s, 2p3/2, and 3d5/2 levels relative to O1s were derived from the hard X‐ray photoelectron spectroscopy measurements. Comparing with the theoretical RSFs calculated from Hartee‐Slater cross sections reported by Scofield with combined energy dependence on the spectrometer function and the inelastic mean free path, the sublinear behaviors as a function of the binding energy on a log‐log plot...

Read More thumbnail image: Relative sensitivity factors in hard Xray photoelectron spectroscopy

AES and XPS depth‐profiling of annealed AlN/Ti‐Al/AlN films for high‐temperature applications in SAW metallization

Published: Mar 23, 2018

Author(s): S. Oswald, E. Lattner, M. Seifert, S. Menzel

Journal: Surface and Interface Analysis

For the application of surface acoustic wave sensors at high temperatures, both a high‐temperature stable piezoelectric substrate as well as a suitable metallization are needed. Besides the intensively studied Ru‐Al thin films on different substrates with various diffusion barriers and different Ru/Al stoichiometry, also TiAl thin films were investigated because of their high temperature stability. In this study, Ti/Al multilayers have...

Read More thumbnail image: AES and XPS depthprofiling of annealed AlNTiAlAlN films for hightemperature applications in SAW metallization

An efficient scheme for purification of a novel recombinant immunotoxin, rCCK8PE38, for anti‐tumour experiments

Published: Mar 22, 2018

Author(s): Pan Hu, Song Zhang, Shi‐ying Lu, Meng Li, Jiang Chang, Meng‐yun Wang, Chang Li, Ke Zhao, Yu‐Ting Guan, Yuan‐Yuan Zhang, Yan‐Song Li, Yu Zhou, Zeng‐Shan Liu, Ou Bai, Hong‐Lin Ren

Journal: Biomedical Chromatography

Abstract rCCK8PE38 is a novel immunotoxin that targets choleystokinin B receptor, which is over‐expressed in some tumor tissues. Although we constructed a prokaryotic expression vector to express rCCK8PE38 in our laboratory, thorough purification was necessary to quantitatively assess its anti‐tumor effect. In this study, we established a purification protocol to obtain rCCK8PE38 with high purity from E. coli. Three different types...

Read More thumbnail image: An efficient scheme for purification of a novel recombinant immunotoxin rCCK8PE38 for antitumour experiments
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