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Surface chemical states of gold nanoparticles prepared using the solution‐plasma method in a CsCl aqueous solution

Published: Sep 13, 2018

Author(s): Chie Tsukada, Hikaru Yoshida, Satoshi Ogawa, Akitaka Yoshigoe, Shinya Yagi, Tsuyoshi Yaita

Journal: Surface and Interface Analysis

In this study, gold nanoparticles (AuNPs) prepared in a 5 mM CsCl aqueous solution using the solution‐plasma method are characterized via transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy with synchrotron radiation (SR‐XPS). The particle diameter is measured over the process time via TEM. During the solution‐plasma process, small particles of 2.1 to 2.2‐nm diameter are generated in the CsCl aqueous solution;...

Read More thumbnail image: Surface chemical states of gold nanoparticles prepared using the solutionplasma method in a CsCl aqueous solution

Recent advances of online coupling of sample preparation techniques with ultra high performance liquid chromatography and supercritical fluid chromatography

Published: Sep 13, 2018

Author(s): Yanshan Liang, Ting Zhou

Journal: Journal of Separation Science

Abstract Ultra high performance liquid chromatography and supercritical fluid chromatography techniques are favored because of their high efficiency and fast analysis speed. Although many sample preparation techniques have been coupled with common liquid chromatography online, the online coupling of sample preparation with the two popular chromatography techniques have gained increasing attention owing to the increasing requirements...

Read More thumbnail image: Recent advances of online coupling of sample preparation techniques with ultra high performance liquid chromatography and supercritical fluid chromatography

Recent development trends for chiral stationary phases based on chitosan derivatives, cyclofructan derivatives and chiral porous materials in high performance liquid chromatography

Published: Sep 13, 2018

Author(s): Sheng‐Ming Xie, Li‐Ming Yuan

Journal: Journal of Separation Science

Abstract The separation of enantiomers by chromatographic methods, such as gas chromatography, high‐performance liquid chromatography and capillary electrochromatography, has become an increasingly significant challenge over the past few decades due to the demand of pharmaceutical, agrochemical, and food analysis. Among these chromatographic resolution methods, high‐performance liquid chromatography based on chiral stationary phases...

Read More thumbnail image: Recent development trends for chiral stationary phases based on chitosan derivatives cyclofructan derivatives and chiral porous materials in high performance liquid chromatography

Applications of polydopamine modifications in capillary electrophoretic analysis

Published: Sep 13, 2018

Author(s): Hao Zhang, Feng‐Qing Yang

Journal: Journal of Separation Science

Abstract Mussel‐inspired polydopamine has been widely used in capillary electrophoresis as a facile and universal tool for the surface modification of capillary, mainly due to its versatility, stability, strong adhesiveness, and biocompatibility properties. In this review, the recent development of mussel‐inspired surface chemistry with rapid deposition of polydopamine was introduced, and the recent applications of polydopamine in...

Read More thumbnail image: Applications of polydopamine modifications in capillary electrophoretic analysis

Production and analysis of multiply charged negative ions by liquid atmospheric pressure matrix‐assisted laser desorption/ionization mass spectrometry

Published: Sep 13, 2018

Author(s): Oliver J. Hale, Pavel Ryumin, Jeffery M. Brown, Michael Morris, Rainer Cramer

Journal: Rapid Communications in Mass Spectrometry

Rationale Liquid atmospheric pressure matrix‐assisted laser desorption/ionisation (AP‐MALDI) has been shown to enable the production of electrospray ionisation (ESI)‐like multiply charged analyte ions with little sample consumption and long‐lasting, robust ion yield for sensitive analysis by mass spectrometry (MS). Previous reports have focused on positive ion production. Here, we report an initial...

Read More thumbnail image: Production and analysis of multiply charged negative ions by liquid atmospheric pressure matrixassisted laser desorptionionization mass spectrometry

Recent advances in the preparation of adsorbent layers for thin‐layer chromatography combined with matrix‐assisted laser desorption/ionization mass‐spectrometric detection

Published: Sep 13, 2018

Author(s): Elizaveta Kucherenko, Anastasiia Kanateva, Andrey Pirogov, Alexander Kurganov

Journal: Journal of Separation Science

Abstract This review is focused on planar chromatography hyphenated with mass‐spectrometric detection for analysis of low‐molecular‐mass solutes. Various kinds of hyphenations are discussed with attention paid to the preparation of thin layer plates suited both for the mass‐spectrometric detection of the resolved solutes direct from thin‐layer plates and for indirect mass‐spectrometric detection of the resolved solutes, performed by...

Read More thumbnail image: Recent advances in the preparation of adsorbent layers for thinlayer chromatography combined with matrixassisted laser desorptionionization massspectrometric detection

Last ten years (2008–2018) of chiral ligand‐exchange chromatography in HPLC: An updated review

Published: Sep 13, 2018

Author(s): Federica Ianni, Lucia Pucciarini, Andrea Carotti, Serena Natalini, Gulnara Z. Raskildina, Roccaldo Sardella, Benedetto Natalini

Journal: Journal of Separation Science

Abstract Chiral ligand‐exchange chromatography is one of the elective strategies for the direct enantioresolution of small chelating compounds: amino acids, diamines, amino alcohols, diols, small peptides, etc. Unlike other methods, the interaction between chiral selector and analyte enantiomers is mediated by a cation, thus producing diastereomeric ternary complexes. Two main approaches are conventionally applied in chiral...

Read More thumbnail image: Last ten years 20082018 of chiral ligandexchange chromatography in HPLC An updated review

Sr substitution effects on atomic and local electronic structure of Ca 2 AlMnO 5+δ

Published: Sep 13, 2018

Author(s): Yuji Kunisada, Genki Saito, Kazuki Hayami, Takahiro Nomura, Norihito Sakaguchi

Journal: Surface and Interface Analysis

We performed the first‐principle calculations based on spin‐polarized density functional theory to investigate the Sr substitution effects on the atomic and local electronic structure of Ca2AlMnO5+δ. The ionic radius of Sr2+ is larger than that of Ca2+; thus, the lattice expansion occurs with Sr substitution. From the total energy calculations, we found that Sr substitution makes the oxygen‐absorbed phase unstable and realizes the lower operation...

Read More thumbnail image: Sr substitution effects on atomic and local electronic structure of Ca 2 AlMnO 5

Investigating the appearance of new psychoactive substances in South Australia using wastewater and forensic data

Published: Sep 12, 2018

Author(s): Richard Bade, Peter Stockham, Ben Painter, Alberto Celma, Lubertus Bijlsma, Felix Hernandez, Jason M. White, Cobus Gerber

Journal: Drug Testing and Analysis

Abstract New psychoactive substances (NPS) have increased in use and popularity worldwide. Wastewater analysis has been successfully applied to evaluate illicit drugs use within a population. However, for NPS, such an approach may be limited due to low doses of NPS combined with their ever‐changing composition and usage. The dynamic nature of the NPS market means use may be opportunistic, infrequent, and with few users. Hence, the...

Read More thumbnail image: Investigating the appearance of new psychoactive substances in South Australia using wastewater and forensic data

On electrophoresis of a pH‐regulated nanogel with ion partitioning effects

Published: Sep 12, 2018

Author(s): P. S. Majee, Somnath Bhattacharyya, Prashanta Dutta

Journal: ELECTROPHORESIS

Abstract The electrophoresis of a polyelectrolyte nanoparticle, whose charge condition depends on the salt concentration and pH of the suspended medium as well as the dielectric permittivity difference, is analyzed. The present nonlinear model for the electrophoresis of this pH‐regulated polyelectrolyte (PE) particle is based on the consideration of full set of governing equations of fluid and ion transport coupled with the equation...

Read More thumbnail image: On electrophoresis of a pHregulated nanogel with ion partitioning effects

Suitability evaluation of new endogenous biomarkers for the identification of nitrite‐based urine adulteration in mass spectrometry methods

Published: Sep 12, 2018

Author(s): Andrea E. Steuer, Kim Arnold, Dominique Kamber, Thomas Kraemer

Journal: Drug Testing and Analysis

Abstract Urine adulteration to circumvent positive drug testing is a fundamental challenge for toxicological laboratories all over the world. Untargeted mass spectrometry (MS) methods used in metabolomics had previously revealed uric acid (UA), histidine, methylhistidine, and their oxidation products, for example 5‐hydroxyisourate (HIU) as potential biomarkers for urine adulteration using potassium nitrite (KNO2). These markers...

Read More thumbnail image: Suitability evaluation of new endogenous biomarkers for the identification of nitritebased urine adulteration in mass spectrometry methods

In situ surface‐enhanced Raman spectroscopic monitoring electrochemical and surface plasmon resonance synergetic catalysis on dehydroxylation of PHTP at Ag electrodes

Published: Sep 11, 2018

Author(s): Xu Li, Chenjie Zhang, Qian Wu, Jing Zhang, Minmin Xu, Yaxian Yuan, Jianlin Yao

Journal: Journal of Raman Spectroscopy

Abstract Surface plasmon resonance (SPR)‐driven heterogeneous catalytic reactions have attracted considerable interests. However, the application of SPR was restricted in few types of surface reaction; the extension of SPR‐catalyzed reaction still remains significant challenge. The introduction of additional external fields is expected to generate the synergetic effect for improving the performance of SPR catalytic reaction. Herein,...

Read More thumbnail image: In situ surfaceenhanced Raman spectroscopic monitoring electrochemical and surface plasmon resonance synergetic catalysis on dehydroxylation of PHTP at Ag electrodes

Oxytocin analysis from human serum, urine, and saliva by orbitrap liquid chromatography–mass spectrometry

Published: Sep 11, 2018

Author(s): Adrian A. Franke, Xingnan Li, Ariane Menden, Mary R. Lee, Jennifer F. Lai

Journal: Drug Testing and Analysis

Abstract Oxytocin (OT) is a neurohormone that has gained interest recently due to its emerging role in cognition and social/emotional behaviors, including possibly depression and autism. OT is commonly measured using enzyme‐ or radio‐based immunoassays (RIA, ELISA), which lack specificity or are complicated to perform and involve hazardous radioactive material. We have developed a high resolution accurate‐mass (HRAM) liquid...

Read More thumbnail image: Oxytocin analysis from human serum urine and saliva by orbitrap liquid chromatographymass spectrometry

Glycine‐modified growth hormone secretagogues identified in seized doping material

Published: Sep 11, 2018

Author(s): Paulina Marta Gajda, Niels Bjerre Holm, Lars Jakobsen Hoej, Brian Schou Rasmussen, Petur Weihe Dalsgaard, Lotte Ask Reitzel, Kristian Linnet

Journal: Drug Testing and Analysis

Abstract A number of unknown pharmaceutical preparations seized by Danish customs authorities were submitted for liquid chromatography–high resolution mass spectrometry (LC–HRMS) analysis. Comparison with reference standards unequivocally identified the content of the powders as analogs of the growth hormone secretagogues GHRP‐2 (Pralmorelin), GHRP‐6, Ipamorelin, and modified growth hormone releasing factor (modified GRF 1–29),...

Read More thumbnail image: Glycinemodified growth hormone secretagogues identified in seized doping material

Production of certified reference materials for the sports doping control of the REV‐ERB agonist SR9009

Published: Sep 11, 2018

Author(s): Stephen R. Davies, Benjamin K.H. Chan, Michael Moawad, Taylor R. Garrett, Lance Brooker, Rima Chakrabarty

Journal: Drug Testing and Analysis

Abstract Two human metabolites of the REV‐ERB agonist SR9009, identified by researchers with an interest in sports doping control, have been synthesized and assessed for purity. The synthesis employed was a modification of published procedures for the parent SR9009, careful attention to the purification of intermediates and the final product ensuring materials of the highest purity were available for certification. For each...

Read More thumbnail image: Production of certified reference materials for the sports doping control of the REVERB agonist SR9009

Hair EtG: Alterations in segment levels accompanying hair growth

Published: Sep 11, 2018

Author(s): Jan Toralf Fosen, Gudrun Høiseth, Cristina Sempio, Nefele Giarratana, Asle Enger, Jørg Mørland, Luca Morini

Journal: Drug Testing and Analysis

Abstract Hair levels of the direct ethanol biomarker ethyl glucuronide (EtG) are used to evaluate history of alcohol intake. The proximal 3 cm of the hair sample is most often analyzed and this is assumed to represent the intake of ethanol over approximately the past three months. The aim of this study was to investigate change of EtG levels during hair growth in an ethanol‐abstinent period. Twenty‐seven patients were recruited from...

Read More thumbnail image: Hair EtG Alterations in segment levels accompanying hair growth

Raman and time of flight secondary ion mass spectrometry investigation answers specific conservation questions on Bosch painting Saint Wilgefortis Triptych

Published: Sep 11, 2018

Author(s): Armida Sodo, Luca Tortora, Paola Biocca, Annalaura Casanova Municchia, Enrico Fiorin, Maria Antonietta Ricci

Journal: Journal of Raman Spectroscopy

Abstract Raman spectroscopy and time of flight secondary ion mass spectrometry (ToF‐SIMS) were used to answer conservation questions left open after the preliminary analysis performed by the restoration team on the Bosch painting Saint Wilgefortis Triptych, within the project “Bosch in Venice.” In this work, we present the results obtained by combining these two techniques on five cross sections, concerning a detailed study of pigments and...

Read More thumbnail image: Raman and time of flight secondary ion mass spectrometry investigation answers specific conservation questions on Bosch painting Saint Wilgefortis Triptych

Influence of temperature on the surface property of ABS resin in KMnO 4 etching solution

Published: Sep 10, 2018

Author(s): Xinchen Han, Guixiang Wang, Jinmeng He, Jingyi Guan, Yandong He

Journal: Surface and Interface Analysis

The KMnO4‐H3PO4‐H2SO4 system was used to roughen and hydrophilically modify on the surface of ABS resin at different etching temperatures, and then, electroless nickel plating process was carried out. The surface of ABS resin after etching was characterized by XPS and SEM. It is found that the surface etching effect of ABS resin is relatively good when the etching temperature is 65°C. The resin surface generates ─OH and ─COOH hydrophilic...

Read More thumbnail image: Influence of temperature on the surface property of ABS resin in KMnO 4 etching solution

Probe electrospray ionization of mixture solutions using metal needles with different tip conditions

Published: Sep 10, 2018

Author(s): Satoshi Ninomiya, Shunpei Iwamoto, Lee Chuin Chen, Kenzo Hiraoka

Journal: Surface and Interface Analysis

Time‐dependent mass spectra of mixture solutions of cytochrome c and cholesterol were measured by probe electrospray ionization (PESI) mass spectrometry and the PESI characteristics for several metal needles were investigated with different tip conditions. For a mixture solution of cytochrome c and cholesterol in 0.1% formic acid methanol/water (1/1) at a motion frequency of 1 Hz, an acupuncture needle with a sharp tip and...

Read More thumbnail image: Probe electrospray ionization of mixture solutions using metal needles with different tip conditions

Observation of DC field‐evaporated ion species extracted from transition metal nitride thin film deposited on tungsten‐tip

Published: Sep 10, 2018

Author(s): Chikasa Nishimura, Yuki Haneji, Hiroshi Tsuji, Yasuhito Gotoh

Journal: Surface and Interface Analysis

The ion species extracted from transition metal nitride thin films were investigated in order to understand the field evaporation mechanism of nitrogen in atom probe analysis. Nitrides of group IV transition metal, ie, titanium (Ti), zirconium (Zr), and hafnium (Hf) nitrides, were chosen for analysis, owing to their good electrical conductivities. The samples were prepared by sputtering deposition of nitride thin film on a tungsten...

Read More thumbnail image: Observation of DC fieldevaporated ion species extracted from transition metal nitride thin film deposited on tungstentip
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