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Covalent organic framework TpPa‐1 as stationary phase for capillary electrochromatographic separation of drugs and food additives

Published: Sep 24, 2018

Author(s): Deying Kong, Zilin Chen

Journal: ELECTROPHORESIS

Abstract Because of unique properties like permanent porosity, low density and large surface area, covalent organic frameworks are attractive microporous materials as stationary phase for CEC. Among them, COF‐TpPa‐1 possesses extraordinary chemical stability and common features of covalent organic frameworks. So, COF‐TpPa‐1 could be a promising material as stationary phase to enhance separation selectivity and tolerate the acid or...

Read More thumbnail image: Covalent organic framework TpPa1 as stationary phase for capillary electrochromatographic separation of drugs and food additives

Linseed oil as a model system for surface enhanced Raman spectroscopy detection of degradation products in artworks

Published: Sep 23, 2018

Author(s): Manuel Gomez, Daniela Reggio, Massimo Lazzari

Journal: Journal of Raman Spectroscopy

Abstract Early evidence of materials decay can provide diagnostic insights to conservators and scientists enhancing the overall knowledge on art materials. Limited knowledge is available on the long‐term behavior of synthetic and natural polymers used in art. This research poses the foundations for studies on organic materials suffering from autoxidation processes, using nondestructive surface enhanced Raman spectroscopy (SERS) for...

Read More thumbnail image: Linseed oil as a model system for surface enhanced Raman spectroscopy detection of degradation products in artworks

Round‐robin layer‐thickness determination: Toward reliable reference‐free X‐ray spectrometry

Published: Sep 23, 2018

Author(s): Kenji Sakurai, Akira Kurokawa

Journal: X-Ray Spectrometry

The present paper reports the results of a round‐robin test recently achieved in Japan for X‐ray fluorescence thickness determination of multilayered samples, such as gold/nickel/copper on a chromium coated quartz glass substrate. In the latest practical application of X‐ray fluorescence analysis, reference‐free determination, which does not rely on the use of an experimentally prepared calibration curve, is frequently employed. In...

Read More thumbnail image: Roundrobin layerthickness determination Toward reliable referencefree Xray spectrometry

Preparative and capillary isoelectric focusing for detection and identification of Aspergillus conidia in complex sample matrices

Published: Sep 21, 2018

Author(s): Marie Horká, Jiří Šalplachta, Filip Růžička, Karel Šlais

Journal: Journal of Separation Science

Abstract This study describes a new method for fast identification of highly hydrophobic conidia of Aspergillus species from both simple and complex matrices. The method is based on recently developed preparative isoelectric focusing in a cellulose‐based separation medium which had to be modified with respect to the highly hydrophobic surface of the conidia. Although Aspergillus conidia are colored, their zones in the cellulose bed were...

Read More thumbnail image: Preparative and capillary isoelectric focusing for detection and identification of Aspergillus conidia in complex sample matrices

Determination of three phenylethanoid glycosides in Osmanthus fragrans fruits by high‐performance liquid chromatography with fluorescence detection

Published: Sep 21, 2018

Author(s): Fangli Hu, Xiaoyan Liao, Zilin Chen

Journal: Journal of Separation Science

Abstract A simple and sensitive high‐performance liquid chromatography with fluorescence detection method has been developed for the determination of active components in Osmanthus fragrans fruits. In this work, reversed‐phase liquid chromatography with a C18 column and mobile phase of methanol/water were applied to effectively separate three phenylethanoid glycosides, including salidroside, neonuezhenide, and nuezhenide. The limits ...

Read More thumbnail image: Determination of three phenylethanoid glycosides in Osmanthus fragrans fruits by highperformance liquid chromatography with fluorescence detection

Improving the estimation of prognosis for glioblastoma patients by MR based hemodynamic tissue signatures

Published: Sep 21, 2018

Author(s): Elies Fuster‐Garcia, Javier Juan‐Albarracín, Germán A. García‐Ferrando, Luis Martí‐Bonmatí, Fernando Aparici‐Robles, Juan M. García‐Gómez

Journal: NMR in Biomedicine

Advanced MRI and molecular markers have been raised as crucial to improve prognostic models for patients having glioblastoma (GBM) lesions. In particular, different MR perfusion based markers describing vascular intrapatient heterogeneity have been correlated with tumor aggressiveness, and represent key information to understand tumor resistance against effective therapies of these neoplasms. Recently, hemodynamic tissue signature (HTS)...

Read More thumbnail image: Improving the estimation of prognosis for glioblastoma patients by MR based hemodynamic tissue signatures

Alkanethiol‐functionalized organosilicon monoliths for nano‐reversed‐phase liquid chromatography

Published: Sep 21, 2018

Author(s): Cihan Demir, Çiğdem Kip, Ali Tuncel

Journal: ELECTROPHORESIS

Abstract Organosilicon monoliths carrying chromatographic ligands with different alkyl chain lengths were obtained by thiol‐methacrylate photopolymerization. The use of thiol‐ene chemistry in the presence of a main monomer with a series of methacrylate functionality (i.e., methacrylate substituted polyhedral oligomeric silsesquioxane) allowed the synthesis of organosilicon monoliths with high cross‐linking density and carrying...

Read More thumbnail image: Alkanethiolfunctionalized organosilicon monoliths for nanoreversedphase liquid chromatography

Effects of electrode size and surface morphology on electrode polarization in physiological buffers

Published: Sep 21, 2018

Author(s): Anil Koklu, Amin Mansoorifar, Ali Beskok

Journal: ELECTROPHORESIS

Abstract Electrode polarization (EP) is inevitable in high conductivity buffers at low AC frequencies due to the accumulation of free charges at the electrode/electrolyte interface. Electrode miniaturization increases EP effect on impedance measurements. In this paper, six gold planar (GP) electrodes having different diameters ( 100 μ m ...

Read More thumbnail image: Effects of electrode size and surface morphology on electrode polarization in physiological buffers

Further evidence for sustainable alternatives to replace threatened animal horn based on quantitative proteomic analysis

Published: Sep 20, 2018

Author(s): Rui Liu, Qiong Huang, Zhenhua Zhu, Yan Zhang, Dawei Qian, Jin‐Ao Duan

Journal: ELECTROPHORESIS

Abstract In the present study, a quantitative proteomic approach was used to analyze and compare the proteome in horns from endangered species (rhinoceros, Saiga antelope, and Tibetan antelope) and common species (yak, water buffalo, and goat) based on the isobaric tag for relative and absolute quantification techniques. In total, 591 proteins were identified, and 321 were quantified and categorized based on molecular function,...

Read More thumbnail image: Further evidence for sustainable alternatives to replace threatened animal horn based on quantitative proteomic analysis

Biofluid pumping and mixing by an AC electrothermal micropump embedded with a spiral microelectrode pair in a cylindrical microchannel

Published: Sep 20, 2018

Author(s): Xiaobo Gao, Yuxiao Li

Journal: ELECTROPHORESIS

Abstract In this paper, we numerically investigated a multifunctional AC electrothermal (ACET) micropump embedded with an asymmetric spiral microelectrode pair in a cylindrical microchannel for simultaneous pumping and mixing in high‐conductivity fluids, which makes the pump useful for biofluid applications. When an AC signal was applied to the asymmetric spiral electrode pair, the vortices induced on the electrode surfaces with...

Read More thumbnail image: Biofluid pumping and mixing by an AC electrothermal micropump embedded with a spiral microelectrode pair in a cylindrical microchannel

Role of Intrinsic Disorder in Animal Desiccation Tolerance

Published: Sep 20, 2018

Author(s): Brett Janis, Clinton Belott, Michael A. Menze

Journal: PROTEOMICS

Abstract This review compares the molecular strategies employed by anhydrobiotic invertebrates to survive extreme water stress. Intrinsically disordered proteins (IDPs) play a central role in desiccation tolerance in all species investigated. Various hypotheses about the functions of anhydrobiosis‐related intrinsically disordered (ARID) proteins, including late embryogenesis abundant (LEA) and tardigrade‐specific intrinsically...

Read More thumbnail image: Role of Intrinsic Disorder in Animal Desiccation Tolerance

Occurrence of multi‐class mycotoxins in Menthae haplocalycis analyzed by ultra‐fast liquid chromatography coupled with tandem mass spectrometry

Published: Sep 20, 2018

Author(s): Jiaoyang Luo, Wenju Zhou, Xiaowen Dou, Jiaan Qin, Ming Zhao, Meihua Yang

Journal: Journal of Separation Science

Abstract To determine the presence of multi‐class mycotoxins in Menthae haplocalycis, a sample processing procedure based on a modified quick, easy, effective, rugged, and safe method, and a rapid and accurate testing method using ultra‐fast performance liquid chromatography coupled with tandem mass spectrometry, was developed and validated. We systematically evaluated the methodology for multi‐mycotoxin analysis in the Menthae haplocalycis...

Read More thumbnail image: Occurrence of multiclass mycotoxins in Menthae haplocalycis analyzed by ultrafast liquid chromatography coupled with tandem mass spectrometry

Exploiting green sorbents in rotating‐disk sorptive extraction for the determination of parabens by high‐performance liquid chromatography with tandem electrospray ionization triple quadrupole mass spectrometry

Published: Sep 20, 2018

Author(s): Camila M. S. Vieira, Melaine Mazurkievicz, Angela Maria Lopez Calvo, Vítor Debatin, Gustavo Amadeu Micke, Pablo Richter, Milton Rosero‐Moreano, Eduardo Carasek da Rocha

Journal: Journal of Separation Science

Abstract In this study, the viability of applying cork and montmorillonite clay modified with ionic liquid as biosorbents in the rotating‐disk sorptive extraction technique was investigated. Specifically, this was aimed at the determination of methyl paraben, ethyl paraben, propyl paraben, and isobutyl paraben, with separation/determination by high‐performance liquid chromatography coupled with mass spectrometry. The optimization of...

Read More thumbnail image: Exploiting green sorbents in rotatingdisk sorptive extraction for the determination of parabens by highperformance liquid chromatography with tandem electrospray ionization triple quadrupole mass spectrometry

Recent applications of on‐line supercritical fluid extraction coupled to advanced analytical techniques for compounds extraction and identification

Published: Sep 20, 2018

Author(s): Andrea del Pilar Sánchez‐Camargo, Fabián Parada‐Alonso, Elena Ibáñez, Alejandro Cifuentes

Journal: Journal of Separation Science

Abstract In a previous review (Sánchez‐Camargo et al., J. Sep. Sci. 40 (2017) 213–227), we discussed the application of on‐line supercritical fluid extraction coupled to chromatographic techniques. This review includes an update of the most recent publications (from January 2016 till June 2018) on this topic, which employs advanced analytical techniques for extracting and identifying valuable analytes. Supercritical fluid extraction has...

Read More thumbnail image: Recent applications of online supercritical fluid extraction coupled to advanced analytical techniques for compounds extraction and identification

Exploring the latent variable space of PLS2 by post‐transformation of the score matrix (ptLV)

Published: Sep 20, 2018

Author(s): Matteo Stocchero

Journal: Journal of Chemometrics

Abstract Projection to Latent Structures (PLS) regression is largely applied in chemometrics. The most used algorithm for performing PLS is probably PLS2. PLS2 solves the problem of redundancy and collinearity in complex data sets and produces a small set of latent variables that can be used to investigate complex phenomena. However, the presence of specific cluster structures or trends in the data can drive PLS2 towards wrong...

Read More thumbnail image: Exploring the latent variable space of PLS2 by posttransformation of the score matrix ptLV

Spectroscopy of metal hexaborides: Phonon dispersion models

Published: Sep 20, 2018

Author(s): Jose A. Alarco, Mahboobeh Shahbazi, Peter C. Talbot, Ian D.R. Mackinnon

Journal: Journal of Raman Spectroscopy

Abstract Raman spectroscopy of many metal hexaborides is well understood for vibrations of Pm 3 ¯ m symmetry that can be ascribed to the breathing and deforming modes of boron octahedral clusters at the corners of the cubic unit cell. However, the significance of the lower energy modes has been subject to debate wherein...

Read More thumbnail image: Spectroscopy of metal hexaborides Phonon dispersion models

Determination of trehalose by ion chromatography and its application to a pharmacokinetic study in rats after intramuscular injection

Published: Sep 19, 2018

Author(s): Hui Chen, Weizhu Chen, Bihong Hong, Yiping Zhang, Zhuan Hong, Ruizao Yi

Journal: Biomedical Chromatography

Abstract An ion chromatography method was established for detecting trehalose in rat plasma. The samples were analyzed using a CPMA1 column (250 × 4.0 mm, Thermo) with 120 mm NaOH as eluent at a flow rate of 0.7 mL/min. The standard curve was y = 1.4316x − 0.0654 (R = 0.9992), and the linear range was 0.2–10 mg/L. The relative standard deviations of within‐run and between‐run precisions at low, medium and high concentrations were within...

Read More thumbnail image: Determination of trehalose by ion chromatography and its application to a pharmacokinetic study in rats after intramuscular injection

Metabolism of vesatolimod in rat, dog, and human liver microsomes: Metabolic stability assessment, metabolite identification, and interspecies comparison

Published: Sep 17, 2018

Author(s): Wen Li, Jing Zhang, Yanping Wang, Fangdi Hu, Yinghua Zhang

Journal: Drug Testing and Analysis

Abstract Vesatolimod (GS‐9620) is an agonist of toll‐like receptor (TLR7) 7, which has been developed as an anti‐hepatitis B virus (HBV) agent. The focus of the present study is on the metabolic stability evaluation and metabolite identification of GS‐9620 in rat, dog, and human liver microsomes, as well as interspecies comparison. The average observed in vitro T1/2 values were 3.06, 13.06, and 15.56 minutes in rat, dog, and human liver...

Read More thumbnail image: Metabolism of vesatolimod in rat dog and human liver microsomes Metabolic stability assessment metabolite identification and interspecies comparison

Organic inclusions evidence, composition, and cathodoluminescence behaviour for the formation conditions of fluorapatite from Anemzi (Morocco)

Published: Sep 17, 2018

Author(s): Magdalena Dumańska‐Słowik, Aleksandra Wesełucha‐Birczyńska, Wiesław Heflik, Weronika Maksymiuk, Magdalena Sikorska‐Jaworowska

Journal: Journal of Raman Spectroscopy

Abstract Fluorapatite from Anemzi alkaline syenite hosts a wealth of solid organic inclusions, mainly of aliphatic (2,935–2,845 cm−1) and aromatic hydrocarbon compositions (3,100–3,000 cm−1), as well as traces of bituminous matter showing a low degree of ordering. The tiny inclusions built from oxides of titanium (rutile and anatase) are the only mineral phases found in host crystals. The two‐phase, liquid–gas fluid inclusions are composed ...

Read More thumbnail image: Organic inclusions evidence composition and cathodoluminescence behaviour for the formation conditions of fluorapatite from Anemzi Morocco

Assessment of the results of a three‐year program for National Standardization and Quality Improvement of Medical Laboratories on Drug of Abuse Testing by the Ministry of Health in Turkey

Published: Sep 17, 2018

Author(s): Tuncay Küme, Ferzane Mercan, Hatice Topsakal, Cigdem Karakukcu, Mehmet Şeneş, Aslı Pınar, Mukaddes Gürler, Hakan Kalafat, Belgin Ünal, Alain G. Verstraete, Yeşim Hamurtekin, Ahmet Aydınlı, Yasemin Şenol, Muhammed Ertuğrul Eğin, Alper Cihan, Elif Güler Kazancı, Eyüp Gümüş

Journal: Drug Testing and Analysis

Abstract The aim of this study is to assess the results of inspections in the last three years of drug abuse testing in medical laboratories according to the latest regulations in Turkey. The on‐site inspections of medical laboratories for drugs abuse testing performed in Alcohol and Drug Addiction Treatment Centers during 2014–2016 are described, and laboratory processes and performance evaluated. The performance of 35...

Read More thumbnail image: Assessment of the results of a threeyear program for National Standardization and Quality Improvement of Medical Laboratories on Drug of Abuse Testing by the Ministry of Health in Turkey
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