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LaFeO 3 thin films as relevant models for the surface investigation of 3‐way catalysts

Published: May 17, 2018

Author(s): Shreya Nandi, Dimitri Blanck, Thomas Carlier, Marie‐Hélène Chambrier, Anne‐Sophie Mamede, Martine Trentesaux, Pardis Simon, Nicolas Nuns, Pascal Roussel, Anthony Ferri, Jean‐Francois Paul, Elise Berrier

Journal: Surface and Interface Analysis

Lanthanum orthoferrite, a highly potential 3‐way catalyst, shaped as a polycrystalline thin film has been comprehensively analysed by combining bulk and surface characterization techniques. The possibility to accomplish unprecedented surface information has been presented, thanks to the combined use of LEIS, XPS, and ToF‐SIMS. The structural, morphological, and surface properties at nanometric scale make such thin films indistinguishable...

Read More thumbnail image: LaFeO 3 thin films as relevant models for the surface investigation of 3way catalysts

Graphene particles supported on silica as sorbent for residue analysis of tetracyclines in milk employing microextraction by packed sorbent

Published: May 15, 2018

Author(s): Edvaldo Vasconcelos Soares Maciel, Bruno Henrique Fumes, Ana Lúcia de Toffoli, Fernando Mauro Lanças

Journal: ELECTROPHORESIS

Abstract This paper describes the use of graphene‐based sorbents for determination of four tetracyclines in milk. The synthesized materials were combined with microextraction by packed sorbent (MEPS) to act as the sample preparation step. The extraction performance of these sorbents was compared to commercial phases, and graphene supported on silica provided the best results. The analytical method optimization was carried out by...

Read More thumbnail image: Graphene particles supported on silica as sorbent for residue analysis of tetracyclines in milk employing microextraction by packed sorbent

Optimization of drying process and pressurized liquid extraction for recovery of bioactive compounds from avocado peel by‐product

Published: May 15, 2018

Author(s): Jorge G. Figueroa, Isabel Borrás‐Linares, Jesús Lozano‐Sánchez, Rosa Quirantes‐Piné, Antonio Segura‐Carretero

Journal: ELECTROPHORESIS

Abstract The aim of the present study was to optimize the extraction of phenolic compounds in avocado peel using pressurized liquid extraction (PLE) with GRAS solvents. Response surface methodology (RSM) based on Central Composite Design 22 model was used in order to optimize PLE conditions. Moreover, the effect of air drying temperature on the total polyphenol content (TPC) and individual phenolic compounds concentration were evaluated. The...

Read More thumbnail image: Optimization of drying process and pressurized liquid extraction for recovery of bioactive compounds from avocado peel byproduct

Development of green extraction processes for Nannochloropsis gaditana biomass valorization

Published: May 14, 2018

Author(s): Andrea del Pilar Sánchez‐Camargo, Natalia Pleite, José Antonio Mendiola, Alejandro Cifuentes, Miguel Herrero, Bienvenida Gilbert‐López, Elena Ibáñez

Journal: ELECTROPHORESIS

Abstract In the present work, the valorization of Nannochloropsis gaditana biomass is proposed within the concept of biorefinery. To this aim, high‐pressure homogenization (HPH) was used to break down the strong cell wall and supercritical fluid extraction (SFE) with pure CO2 was applied as a first step to extract valuable compounds (such as non‐polar lipids and pigments). Extraction of the remaining residue for the recovery of bioactive...

Read More thumbnail image: Development of green extraction processes for Nannochloropsis gaditana biomass valorization

Surface analysis of fine water‐atomized iron powder and sintered material

Published: May 10, 2018

Author(s): J. Wendel, R. Shvab, Y. Cao, E. Hryha, L. Nyborg

Journal: Surface and Interface Analysis

Press and sinter is a core technology in powder metallurgy in which a metal powder is mixed with a lubricant and other additives and subsequently compacted at large mechanical pressures to create the desired shape. The component is then delubricated and finally sintered to strengthen the material. The end result of the sintering depends on both the physical properties of the powder such as particle size, morphology, and size distribution,...

Read More thumbnail image: Surface analysis of fine wateratomized iron powder and sintered material

Surface analysis of iron and steel nanopowder

Published: May 10, 2018

Author(s): Swathi K. Manchili, Ruslan Shvab, Abdelhafid Zehri, Lilei Ye, Eduard Hryha, Johan Liu, Lars Nyborg

Journal: Surface and Interface Analysis

High sinter density is desired in powder metallurgy components as the requirement for performance is increasing day‐by‐day. One of the promising ways to achieve improved densification during sintering is through the addition of nanopowder to the conventional micrometer sized metal powder. It is well known that the surface chemistry of the powder has a decisive effect on sintering and consequently the properties of the components produced....

Read More thumbnail image: Surface analysis of iron and steel nanopowder

Shell thickness determination for PTFE‐PS core‐shell nanoparticles using scanning transmission X‐ray microscopy (STXM)

Published: May 10, 2018

Author(s): A. Müller, S. Swaraj, K. Sparnacci, W.E.S. Unger

Journal: Surface and Interface Analysis

A scanning transmission X‐ray microscopy (STXM)‐based methodology is introduced for determining the dimensions (shell thickness, core and total diameter) of core‐shell nanoparticles, which exhibit a strong X‐ray absorption contrast and a well‐defined interface between core and shell material. A low radiation dosage during data acquisition and, therefore, less X‐ray beam‐induced damage of the sample is achieved by recording STXM images...

Read More thumbnail image: Shell thickness determination for PTFEPS coreshell nanoparticles using scanning transmission Xray microscopy STXM

Soft X‐ray characterization of ion beam sputtered magnesium oxide (MgO) thin film

Published: May 10, 2018

Author(s): Mangalika Sinha, Mukul Gupta, Philippe Jonnard, Mohammed H. Modi

Journal: Surface and Interface Analysis

In the present study, surface and interface characterization of magnesium oxide (MgO) thin film is carried out by using non‐destructive soft X‐ray reflectivity and absorption technique. To get a further insight about the in‐depth and surface composition, secondary ion mass spectroscopy measurement is also carried out. The analysis of the reflectivity data indicates the presence of Mg‐Si‐O layer between the principal layer (MgO) and Si...

Read More thumbnail image: Soft Xray characterization of ion beam sputtered magnesium oxide MgO thin film

Crossed mixture‐process design for optimization of simultaneous adsorption of Tartrazine and Indigo carmine dyes by cobalt hydroxide nanosorbent

Published: May 10, 2018

Author(s): Maryam Bagtash, Javad Zolgharnein

Journal: Journal of Chemometrics

Abstract The present paper focused on the removal of Tartrazine and indigo carmine from aqueous solutions by cobalt hydroxide nanosorbent. This novel and efficient nanosorbent were successfully used to remove two anionic dyes from aqueous solutions in single and binary systems. The characterization of sorbent was carried out with scanning electron microscopy micrographs, X‐ray diffraction, and Fourier transform infrared spectroscopy analysis....

Read More thumbnail image: Crossed mixtureprocess design for optimization of simultaneous adsorption of Tartrazine and Indigo carmine dyes by cobalt hydroxide nanosorbent

Neural network for prediction of 13 C NMR chemical shifts of fullerene C 60 mono‐adducts

Published: May 10, 2018

Author(s): Ilya I. Kiryanov, Arthur R. Tulyabaev, Farit Kh. Mukminov, Leonard M. Khalilov

Journal: Journal of Chemometrics

Abstract Real‐valued models based on deep artificial neural networks were proposed to predict 13C NMR chemical shifts of fullerene C60 core carbon atoms for computer‐aided structure elucidation of complex fullerene C60 mono‐adducts. We showed that parametric rectified linear units could be successfully used as activation functions in hidden layers of artificial neural networks for decision of complex physical‐chemical tasks. A total of 400 artificial...

Read More thumbnail image: Neural network for prediction of 13 C NMR chemical shifts of fullerene C 60 monoadducts

Model and estimators for partial least squares regression

Published: May 10, 2018

Author(s): Inge Svein Helland, Solve Sæbø, Trygve Almøy, Raju Rimal

Journal: Journal of Chemometrics

Abstract Partial least squares (PLS) regression has been a very popular method for prediction. The method can in a natural way be connected to a statistical model, which now has been extended and further developed in terms of an envelope model. Concentrating on the univariate case, several estimators of the regression vector in this model are defined, including the ordinary PLS estimator, the maximum likelihood envelope estimator,...

Read More thumbnail image: Model and estimators for partial least squares regression

Multivariate patent analysis—Using chemometrics to analyze collections of chemical and pharmaceutical patents

Published: May 10, 2018

Author(s): Rickard Sjögren, Kjell Stridh, Tomas Skotare, Johan Trygg

Journal: Journal of Chemometrics

Abstract Patents are an important source of technological knowledge, but the amount of existing patents is vast and quickly growing. This makes development of tools and methodologies for quickly revealing patterns in patent collections important. In this paper, we describe how structured chemometric principles of multivariate data analysis can be applied in the context of text analysis in a novel combination with common machine...

Read More thumbnail image: Multivariate patent analysisUsing chemometrics to analyze collections of chemical and pharmaceutical patents

Genome‐wide feature analysis of the sequence‐specific recognition in intermolecular interaction between TGF‐β pathway DNA and MEG3 lncRNA in human cancer

Published: May 10, 2018

Author(s): Liang Cao, Bojian Xie, Bingbing Cui, Beibei Chen, Zhaosheng Ma, Xiaobing Chen, Xiaokun Shen, Feilin Cao

Journal: Journal of Chemometrics

Abstract The long noncoding RNAs MEG3 is involved in the pathogenesis and metastasis of cancer, which has been found to target the distal regulatory elements (DREs) of TGF‐β pathway genes TGFBR1, TGFB2, and SMAD2 by forming DNA‐RNA triplex. Here, the molecular mechanism of MEG3 binding to its cognate or noncognate DNA partners is investigated systematically via an integrative chemometric approach. Here, we apply a spatial information...

Read More thumbnail image: Genomewide feature analysis of the sequencespecific recognition in intermolecular interaction between TGF pathway DNA and MEG3 lncRNA in human cancer

Influence of Cr addition on hot‐dip galvanizing reaction of Mn containing sheet steel

Published: May 9, 2018

Author(s): T. Kawano, Y. Fushiwaki, Y. Nagataki, M. Nagoshi

Journal: Surface and Interface Analysis

To clarify the influence of Cr on the galvanizability of a sheet steel containing Mn, a Cr‐added Mn steel and a Cr‐free Mn steel were compared in terms of selective surface oxidation and interfacial reaction during galvanizing with a molten Zn bath containing Al. The surface oxides formed by selective oxidation on the Cr‐added steel were identified as Mn‐Cr spinel in addition to MnO, whereas only MnO was found on the Cr‐free steel....

Read More thumbnail image: Influence of Cr addition on hotdip galvanizing reaction of Mn containing sheet steel

X‐radiography of cultural heritage materials using handheld XRF spectrometers

Published: May 8, 2018

Author(s): Jiuan Jiuan Chen, Aaron Shugar, Ashley Jehle

Journal: X-Ray Spectrometry

This study investigated the feasibility, repeatability, and limitations of using handheld X‐ray fluorescence spectrometers to perform radiography with thorough safety measures. Radiography is a well‐established nondestructive technique commonly used in the field of cultural heritage preservation but not easily accessible to many. Equipped with X‐ray generating tubes, handheld spectrometers could potentially assist performing radiographic...

Read More thumbnail image: Xradiography of cultural heritage materials using handheld XRF spectrometers

Nuclear magnetic resonance (NMR)‐based metabolomics for cancer research

Published: May 7, 2018

Author(s): Renuka Ranjan, Neeraj Sinha

Journal: NMR in Biomedicine

Nuclear magnetic resonance (NMR) has emerged as an effective tool in various spheres of biomedical research, amongst which metabolomics is an important method for the study of various types of disease. Metabolomics has proved its stronghold in cancer research by the development of different NMR methods over time for the study of metabolites, thus identifying key players in the aetiology of cancer. A plethora of one‐dimensional and...

Read More thumbnail image: Nuclear magnetic resonance NMRbased metabolomics for cancer research

Study of supercritical CO 2 extraction of tamarillo ( Cyphomandra Betacea ) seed oil containing high added value compounds

Published: May 7, 2018

Author(s): Daniela Dorado Achicanoy, Andrés Hurtado Benavides, Hugo A. Martínez‐Correa

Journal: ELECTROPHORESIS

Abstract In the present investigation, the extraction of tamarillo seed oil was conducted using supercritical carbon dioxide (SC‐CO2), under different conditions of pressure (20–38.1 MPa) and temperature (40–64°C). In order to determine the effect that these extraction parameters have over the yield and composition of the oil, a central composite design was used. The optimum yield was 21.07% obtained at 38.1 MPa and 64°C. The fatty...

Read More thumbnail image: Study of supercritical CO 2 extraction of tamarillo  Cyphomandra Betacea  seed oil containing high added value compounds

A simple, low‐cost and robust capillary zone electrophoresis method with capacitively coupled contactless conductivity detection for the routine determination of four selected penicillins in money‐constrained laboratories

Published: May 4, 2018

Author(s): Prasanta Paul, Cari Sänger‐van de Griend, Erwin Adams, Ann Schepdael

Journal: ELECTROPHORESIS

Abstract A simple and robust capillary zone electrophoresis method was developed and validated for the determination of amoxicillin and clavulanate, ampicillin, phenoxymethyl penicillin (Pen V) as well as flucloxacillin. Capacitively coupled contactless conductivity detection was employed as detection mode that makes CE a simple and economic tool for money‐constrained laboratories. The developed method is...

Read More thumbnail image: A simple lowcost and robust capillary zone electrophoresismethod with capacitively coupled contactless conductivity detection for the routine determination of four selected penicillins in moneyconstrained laboratories

In situ growth of Zr‐based metal‐organic framework UiO‐66‐NH 2 for open‐tubular capillary electrochromatography

Published: May 4, 2018

Author(s): Pingxiu Tang, Rong Wang, Zilin Chen

Journal: ELECTROPHORESIS

Abstract The high stability and other properties of Zr(IV)‐based metal organic frameworks(MOFs) make it a promising choice for chromatographic separation, while the application in open‐tubular capillary electrochromatography (OT‐CEC) separation has not been explored yet. Herein, we report the first example of the in‐situ growth of UiO‐66‐NH2 onto the capillary for open‐tubular capillary electrochromatography. UiO‐66‐NH2 consists of ZrCl4 and...

Read More thumbnail image: In situ growth of Zrbased metalorganic framework UiO66NH 2 for opentubular capillary electrochromatography

The effect of tea consumption on the steroid profile

Published: May 3, 2018

Author(s): Sergi Coll, Xavier Matabosch, Lorena Garrostas, Nuria Monfort, Clara Perez‐Maña, Nieves Pizarro, Julián A. Mateus, Mohammed Ezzel, Rafael Torre, Rosa Ventura

Journal: Drug Testing and Analysis

Abstract Green tea (GT), along with its flavonol epigallocatechin−3‐gallate (EGCG), has shown to inhibit the UGT2B17 isoenzyme, which is highly involved in the glucuronidation of testosterone (T) and its metabolites. Since the steroid profile (SP) is composed of urinary concentrations of T and related metabolites excreted in both the free and the glucuronide fractions, GT consumption could alter the SP, leading to misunderstanding...

Read More thumbnail image: The effect of tea consumption on the steroid profile
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