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A high‐performance multifunctional substrate of ultrathin‐layer chromatography ( UTLC ) and surface‐enhanced R aman scattering ( SERS ) for rapid biochemical mixture screening

Published: Sep 5, 2018

Author(s): Bi‐Shen Lee, Ding‐Zheng Lin, Chih‐Hao Huang, Ta‐Jen Yen

Journal: Journal of Raman Spectroscopy

Abstract We present a multifunctional substrate of ultrathin‐layer chromatography (UTLC) and surface‐enhanced Raman scattering (SERS), which enables analytes separation and label‐free detection simultaneously. This integrated substrate is composed of silicon nanowires array (SiNWA), decorated with silver nano‐dendrites (AgNDs). This SiNWA is fabricated by a facile and low‐cost metal‐assisted chemical etching process, and the AgNDs...

Read More thumbnail image: A highperformance multifunctional substrate of ultrathinlayer chromatography  UTLC  and surfaceenhanced R aman scattering  SERS  for rapid biochemical mixture screening

Distinguishing the Raman spectrum of polygonal serpentine

Published: Sep 5, 2018

Author(s): Matthew S. Tarling, Jeremy S. Rooney, Cecilia Viti, Steven A.F. Smith, Keith C. Gordon

Journal: Journal of Raman Spectroscopy

Abstract Positively identifying serpentine mineral types is important for a wide range of disciplines in the Earth sciences and health sciences. Although Raman spectroscopy has been widely applied as a tool to distinguish four of the main serpentine minerals (i.e., antigorite, lizardite, chrysotile, and polygonal serpentine), some uncertainty remains as to whether all four varieties have unique Raman spectra. In this paper,...

Read More thumbnail image: Distinguishing the Raman spectrum of polygonal serpentine

Normal‐phase versus reversed‐phase thin‐layer chromatography (TLC) to monitor oxidized phosphatidylcholines by TLC/mass spectrometry

Published: Sep 4, 2018

Author(s): Kathrin M. Engel, Hans Griesinger, Michael Schulz, Jürgen Schiller

Journal: Rapid Communications in Mass Spectrometry

Rationale Normal‐phase thin‐layer chromatography (NP‐TLC) is an established method for the separation of all major phospholipid classes according to the different polarities of the head groups. In contrast, reversed‐phase (RP)‐TLC is much less frequently used for this purpose. This study aimed to compare the NP and the RP approach regarding their separation potential of phospholipid oxidation products. ...

Read More thumbnail image: Normalphase versus reversedphase thinlayer chromatography TLC to monitor oxidized phosphatidylcholines by TLCmass spectrometry

Mass spectrometry in drug metabolism and pharmacokinetics: Current trends and future perspectives

Published: Sep 4, 2018

Author(s): Filip Cuyckens

Journal: Rapid Communications in Mass Spectrometry

Drug Metabolism and Pharmacokinetics (DMPK) is a core scientific discipline within drug discovery and development as well as post‐marketing. It helps to design and select the most promising drug candidate and obtain advanced insights on the processes that control absorption, distribution, metabolism and excretion (ADME) of the final drug candidate. Mass spectrometry is one of the key technologies applied in DMPK....

Read More thumbnail image: Mass spectrometry in drug metabolism and pharmacokinetics Current trends and future perspectives

An ocfentanil‐related death case: UHPLC–MS/MS analysis of the drug

Published: Sep 3, 2018

Author(s): Sara Casati, Mauro Minoli, Ilaria Angeli, Alessandro Ravelli, Graziano Domenico Luigi Crudele, Marica Orioli

Journal: Drug Testing and Analysis

Read More thumbnail image: An ocfentanilrelated death case UHPLCMSMS analysis of the drug

Evidence of seasonal variation of ethyl glucuronide in hair: Modeling a seven‐year data series

Published: Sep 3, 2018

Author(s): Patryk Własiuk, Eugenio Alladio, Alberto Salomone, Marco Vincenti, Grzegorz Zadora

Journal: Drug Testing and Analysis

Abstract The assessment of chronic excessive alcohol consumption by ethyl glucuronide (EtG) determination in hair is generally based on a cut‐off value of 30 pg/mg recognized by regulatory authorities and scientific societies that guide the decision process. The ongoing debate about the risks connected with the straightforward application of this cut‐off refers to the factors that may influence the detected EtG concentration....

Read More thumbnail image: Evidence of seasonal variation of ethyl glucuronide in hair Modeling a sevenyear data series

Rapid and efficient western blot assay by rotational cyclic draining and replenishing procedure

Published: Sep 3, 2018

Author(s): Saba Sajjad, Mui Thi Do, Heung‐Seon Shin, Tae‐Sung Yoon, Sunghyun Kang

Journal: ELECTROPHORESIS

Abstract Western blot is a principal technique for the detection of specific proteins in various biology disciplines. The antibody incubation is an imperative step in western blot. Antibody incubation by mild shaking on a rocker is generally used to facilitate mixing of antibodies. However, mild shaking is an inefficient process to remove antibody depletion layer on blotting membrane and requires hours of incubation time to achieve...

Read More thumbnail image: Rapid and efficient western blot assay by rotational cyclic draining and replenishing procedure

Injection system for fast capillary electrophoresis based on pressure regulation with flow restrictors

Published: Sep 3, 2018

Author(s): Jasmine S. Furter, Peter C. Hauser

Journal: ELECTROPHORESIS

Abstract A fast automated system for rapid electrophoretic separations in short conventional capillaries employing contactless conductivity detection is presented. The instrument is based on pneumatic pressurization and does not require a conventional pump. The required pressures and flow rates for the different steps of the injection and flushing processes are produced with the help of two flow restrictors. The device is...

Read More thumbnail image: Injection system for fast capillary electrophoresis based on pressure regulation with flow restrictors

Optimization of a reduced volume PCR amplification for PowerPlex® Fusion kit using FTA™ cards and generation of population genetic data for Brunei population

Published: Sep 3, 2018

Author(s): Paul Vun Onn Liew, Laura Natalia Riccardi, Abimbola Olatunde Afolabi, William Goodwin, Sibte Hadi

Journal: ELECTROPHORESIS

Abstract The commercial PowerPlex® Fusion kit is an autosomal STR multiplex kit that has high discrimination power and is more informative in forensic, paternity, and relationship‐testing cases. Key features of this multiplex system are the possibility to direct amplify FTA™ card punches as well as non‐FTA cards and commonly used swabs; optimised inhibitor tolerance and high sensitivity generating full profiles from amount as little...

Read More thumbnail image: Optimization of a reduced volume PCR amplification for PowerPlex Fusion kit using FTA cards and generation of population genetic data for Brunei population

A highly sensitive aptasensor for on‐site detection of lipopolysaccharides in food

Published: Sep 3, 2018

Author(s): Cheng Cheng, Jayne Wu, Jiangang Chen

Journal: ELECTROPHORESIS

Abstract A rapid, low‐cost, highly sensitive, and specific capacitive aptasensor is presented for detection of lipopolysaccharides (LPS). Exposure to LPS could cause fever, gram‐negative sepsis, septic shock, and eventual death. Hence, rapid, low cost, and sensitive detection of LPS is pivotal for the safety of food, pharmaceutical, and medical devices and products. In this work, a capacitive sensing method based on alternating...

Read More thumbnail image: A highly sensitive aptasensor for onsite detection of lipopolysaccharides in food

Ion formation in droplet‐assisted ionization

Published: Sep 3, 2018

Author(s): Michael J. Apsokardu, Devan E. Kerecman, Murray V. Johnston

Journal: Rapid Communications in Mass Spectrometry

Rationale In droplet‐assisted ionization (DAI), intact molecular ions are generated from molecules in aerosol droplets by passing the droplets through a temperature‐controlled capillary inlet. Ion formation is explored through the effects of analyte mass flow, droplet solvent composition, and capillary temperature on ion signal intensity. Methods A Waters...

Read More thumbnail image: Ion formation in dropletassisted ionization

Secondary ion mass spectrometry depth profiling of ultrathick films using an argon gas cluster source: Crater shape implications on the analysis area as a function of depth

Published: Sep 3, 2018

Author(s): Shin Muramoto, Cayla Collett

Journal: Surface and Interface Analysis

Argon cluster ions have enabled molecular depth profiling to unprecedented depths, with minimal loss of chemical information or changes in sputter rate. However, depth profiling of ultrathick films (>100 μm) using a commercial ion source oriented at 45° to the surface causes the crater bottom to shrink in size because of a combination of the crater wall angle, sputter rate differences along the trailing‐edge crater wall, and...

Read More thumbnail image: Secondary ion mass spectrometry depth profiling of ultrathick films using an argon gas cluster source Crater shape implications on the analysis area as a function of depth

High‐temperature 2D Fermi surface of SrTiO 3 studied by energy‐filtered PEEM

Published: Sep 3, 2018

Author(s): Claire Mathieu, Sara Gonzalez, Christophe Lubin, Olivier Copie, Vitaliy Feyer, Claus M. Schneider, Nick Barrett

Journal: Surface and Interface Analysis

Functional oxides displaying phenomena such as 2D electron gas (2DEG) at oxide interfaces represent potential technological breakthroughs for post‐CMOS (Complementary Metal Oxide Semiconductor) electronics. Noninvasive techniques are required to study the surface chemistry and electronic structure underlying their often unique electrical properties. The sensitivity of photoemission electron microscopy (PEEM) to local potential, chemistry,...

Read More thumbnail image: Hightemperature 2D Fermi surface of SrTiO 3 studied by energyfiltered PEEM

Observation of spider silk by femtosecond pulse laser second harmonic generation microscopy

Published: Sep 3, 2018

Author(s): Yue Zhao, Yanrong Li, Khuat Thi Thu Hien, Goro Mizutani, Harvey N. Rutt

Journal: Surface and Interface Analysis

An asymmetric β‐sheet structure of spider silk is said to induce optical second harmonic generation. In this paper, using an in‐house nonscanning type femtosecond pulse laser second harmonic generation microscope, we characterized the behavior of the β‐sheet of spider silk under an applied external force. The orientation of the β‐sheets was more unidirectional when the silk was extended. One of the origins of the high mechanical strength...

Read More thumbnail image: Observation of spider silk by femtosecond pulse laser second harmonic generation microscopy

Easy functionalization process applied to develop super‐hydrophobic and oleophobic properties on ASTM 1200 aluminum surface

Published: Sep 3, 2018

Author(s): Andreia Rocha Canella Carneiro, Fábio Augusto Souza Ferreira, Manuel Houmard

Journal: Surface and Interface Analysis

Super‐hydrophobic and oleophobic surfaces on ASTM 1200 H14 aluminum alloy substrates were achieved by chemical etching followed by deposition of organically modified silicate (ORMOSIL) coatings synthesized through sol‐gel method. The chemical etching using FHH solutions (FeCl3 + HCl + H2O2) was adapted for the studied aluminum alloy by varying the concentration of iron (III) chloride and the etching time in order to...

Read More thumbnail image: Easy functionalization process applied to develop superhydrophobic and oleophobic properties on ASTM 1200 aluminum surface

Application of atom probe tomography to fundamental issues of steel materials

Published: Sep 3, 2018

Author(s): Jun Takahashi, Kazuto Kawakami, Yukiko Kobayashi

Journal: Surface and Interface Analysis

Although steel research has a very long history, there are still various questions and uncertainties on the fundamental issues of steel materials. Our aim is to clarify the issues by atomic‐scale characterization using atom probe tomography (APT). This paper introduced our developed techniques in application of APT into steel materials. The first one is the specimen tip preparation technique from the site‐specific regions of interest in...

Read More thumbnail image: Application of atom probe tomography to fundamental issues of steel materials

Peptide‐modified stainless steel with resistance capacity of Staphylococcus aureus biofilm formation

Published: Sep 3, 2018

Author(s): Pan Cao, Xiaoyan He, Jinfei Xiao, Chengqing Yuan, Xiuqin Bai

Journal: Surface and Interface Analysis

Attachment of marine fouling organisms causes biofouling. The adhesion of destructive organisms can be reduced through surface modification with antibiofilm chemicals. In this study, a direct surface modification between peptide solution with different concentrations and stainless steel was performed, and the reaction mechanism was explained by simulation of the modification process. Results of surface water contact angle and surface...

Read More thumbnail image: Peptidemodified stainless steel with resistance capacity of Staphylococcus aureus biofilm formation

Quantitative XAFS/EELS analyses of nitrogen species in titanium oxide photocatalysts

Published: Sep 3, 2018

Author(s): Tomoko Yoshida, Muenaki Yamamoto, Masato Akatsuka, Akiyo Ozawa, Yuma Kato, Shinya Yagi, Tetsuo Tanabe

Journal: Surface and Interface Analysis

With a view to rational designing of a highly functional visible‐light TiO2 photocatalyst, nitrogen atoms were doped into TiO2 samples by an ion implantation technique which enables to control the depth and concentration of dopants. Although the absorbance in the visible‐light region of the sample increased by the nitrogen doping, photocatalytic activity of the sample was not directly connected with the photo‐absorbance. The N K‐edge X‐ray...

Read More thumbnail image: Quantitative XAFSEELS analyses of nitrogen species in titanium oxide photocatalysts

Segregation of dioctyl phthalate to the surface of polystyrene films characterized by ToF‐SIMS and XPS

Published: Sep 2, 2018

Author(s): Wenjing Xie, Lu‐Tao Weng, King Lun Yeung, Chi‐Ming Chan

Journal: Surface and Interface Analysis

Polystyrene (PS)‐dioctyl phthalate (DOP) films were prepared by spin coating solutions of a mixture of PS and DOP on Si wafers and characterized by time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) and X‐ray photoelectron spectroscopy (XPS). ToF‐SIMS depth profile results showed that DOP mainly segregated to the top 10 nm of the surface of the PS‐DOP film as well as to the interface between the film and the substrate. The...

Read More thumbnail image: Segregation of dioctyl phthalate to the surface of polystyrene films characterized by ToFSIMS and XPS

Study on carbon dioxide reduction with water over metal oxide photocatalysts

Published: Sep 2, 2018

Author(s): Yuma Kato, Muneaki Yamamoto, Masato Akatsuka, Ryota Ito, Akiyo Ozawa, Yu Kawaguchi, Tetsuo Tanabe, Tomoko Yoshida

Journal: Surface and Interface Analysis

Various metal oxides with 0.1 wt% Ag loaded as a cocatalyst were prepared by an impregnation method and examined their photocatalytic activity for CO2 reduction with water. Among all the prepared Ag‐loaded metal oxides, Ga2O3, ZrO2, Y2O3, MgO, and La2O3 showed activities for CO and H2 productions under ultraviolet light irradiation. Thus, metal oxides involving metal cations with closed shell electronic structures such as d0, d10, and s0 had the...

Read More thumbnail image: Study on carbon dioxide reduction with water over metal oxide photocatalysts
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