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Resolution of R‐(−) and S‐(+)‐ enantiomers of clenbuterol in pharmaceutical preparations and black‐market products using liquid chromatography–tandem mass spectrometry

Published: Oct 23, 2017

Author(s): Benjamín Velasco‐Bejarano, Jahir Bautista, Ma. Olivia Noguez, Evangelina Camacho, Martha E. Rodríguez, Leonardo Rodríguez

Journal: Drug Testing and Analysis

Several banned substances are illegally used by athletes in racemic mixtures for performance enhancement. These include clenbuterol, methyl hexaneamine, methamphetamines, and amphetamines. Clenbuterol is present in a large number of doping samples from Olympic and non‐Olympic athletes that have adverse analytical findings (AAFs). In some cases, the presence of these substances could be the result of consumption of meat contaminated with...

Read More thumbnail image: Resolution of R and S enantiomers of clenbuterol in pharmaceutical preparations and blackmarket products using liquid chromatographytandem mass spectrometry

Hybrid central composite design for simultaneous optimization of removal of methylene blue and alizarin red S from aqueous solutions using Vitis tree leaves

Published: Oct 23, 2017

Author(s): Maryam Bagtash, Javad Zolgharnein

Journal: Journal of Chemometrics

Abstract Vitis tree leaves powder was used for efficient removal of dyes (eg, alizarin red and methylene blue) from water samples in binary batch systems. The influence of various parameters such as initial pH, initial dye concentration, and sorbent mass on the biosorption process was investigated. Statistical experimental design was utilized to optimize this biosorption process. A regression model was derived using a response...

Read More thumbnail image: Hybrid central composite design for simultaneous optimization of removal of methylene blue and alizarin red S from aqueous solutions using Vitis tree leaves

Identification and Functional Analysis of Chitin Synthase A in Oriental Armyworm, Mythimna separata

Published: Oct 20, 2017

Author(s): Yifan Zhai, Xiaobin Fan, Zhenjuan Yin, Xiangzhao Yue, Xingyuan Men, Li Zheng, Wenqing Zhang

Journal: PROTEOMICS

Abstract Chitin synthases are very important enzymes for chitin synthesis in various species, which makes them a specific target of insecticides. In the present study, the function of the chitin synthase A (CHSA) gene isolated from Mythimna separate is investigated. The majority of dsMysCHSA treated larvae (89.50%) exhibit lethal phenotypes, including three phenotypes with severe cuticle deformations. The dsMysCHSA treatment in adult females affects...

Read More thumbnail image: Identification and Functional Analysis of Chitin Synthase A in Oriental Armyworm Mythimna separata

Discovery of Antimicrobial Peptides in Cervical‐Vaginal Fluid from Healthy Nonpregnant Women via an Integrated Proteome and Peptidome Analysis

Published: Oct 20, 2017

Author(s): Carla M. J. Muytjens, Yijing Yu, Eleftherios P. Diamandis

Journal: PROTEOMICS

Abstract Cervical‐vaginal fluid (CVF) covers the lower part of the female reproductive system and functions in the homeostasis and immunity of the surrounding tissues. In contrast to the CVF proteome of both nonpregnant and pregnant women, the CVF peptidome has not been reported to date. In the current study, we identified 1087 proteins in CVF, of which 801 proteins were not previously identified in CVF proteomes. The presence of...

Read More thumbnail image: Discovery of Antimicrobial Peptides in CervicalVaginal Fluid from Healthy Nonpregnant Women via an Integrated Proteome and Peptidome Analysis

How effective are reducing plasma afterglows at atmospheric pressure in removing sulphide layers: Application on tarnished silver, sterling silver and copper

Published: Oct 20, 2017

Author(s): Olivier Schalm, Patrick Storme, Arianna Gambirasi, Monica Favaro, Alessandro Patelli

Journal: Surface and Interface Analysis

A plasma afterglow from a gas mixture of 5 vol% H2 in He is able to remove tarnish layers on pure silver in a matter of seconds. This dry, localized, and noncontact cleaning technique is a promising method to clean historical objects where silver is combined with organic materials and where traditional cleaning techniques are not recommended. However, historical objects are often manufactured with silver alloys but somehow their...

Read More thumbnail image: How effective are reducing plasma afterglows at atmospheric pressure in removing sulphide layers Application on tarnished silver sterling silver and copper

Surface treatment of ultra‐high molecular weight polyethylene fibers using potassium permanganate and mechanical properties of its composites

Published: Oct 20, 2017

Author(s): Weiwei Li, Renliang Ma, Momo Huang, Li Meng, Qiwei Pan

Journal: Surface and Interface Analysis

Potassium permanganate was applied to improve the surface properties of the ultra‐high molecular weight polyethylene (UHMWPE) fibers. The results suggested that the surface oxygen atoms increased dramatically and the O/C ratio increased from 0.030 to 0.563 after treatment. The increased surface roughness and the O‐containing groups on the treated fiber surface decreased the contact angles with water and ethylene glycol. The crystallinity...

Read More thumbnail image: Surface treatment of ultrahigh molecular weight polyethylene fibers using potassium permanganate and mechanical properties of its composites

Analysis of polymer parts: buried problems

Published: Oct 19, 2017

Author(s): Mary Jane Walzak, Heather Bloomfield

Journal: Surface and Interface Analysis

The analysis of manufactured parts for the source of defects is challenging as these defects are often buried below the surface. An example of this type of problem is a defect that occurs in a molded and multilayered painted part. The automotive industry continues to increase the amount of plastics used in their vehicles in order to reduce weight and increase fuel efficiencies. The polymers are usually specified based...

Read More thumbnail image: Analysis of polymer parts buried problems

Effects of lithium insertion and deinsertion into V2O5 thin films: Optical, structural, and absorption properties

Published: Oct 19, 2017

Author(s): R. Jourdani, L. Jadoual, M. Ait El Fqih, A. El Boujlaidi, H. Aouchiche, A. Kaddouri

Journal: Surface and Interface Analysis

The lithiated/delithiated vanadium pentoxide films deposited by sol‐gel spin coating on indium tin oxide–coated glass substrates were analyzed by sputter‐induced photon spectroscopy, X‐ray diffraction, and optical absorption techniques. First, it is shown that the crystalline structure of V2O5 after intercalation remains practically unchanged. Particularly, in the optical spectra during 5 keV Kr+ ion bombardment of clean, intercalated, and...

Read More thumbnail image: Effects of lithium insertion and deinsertion into V2O5 thin films Optical structural and absorption properties

The effect of coupling agents on the interfacial properties of wood‐fiber–reinforced polyimide composites

Published: Oct 19, 2017

Author(s): Li Ying, Yang Liu, Hu Dan, Yang Di

Journal: Surface and Interface Analysis

Wood‐fiber–reinforced polyimide (PI) has been widely used in many engineering fields because of its high specific strength and stiffness. However, PI does not adhere well with wood fibers because it has a low free surface energy. In addition, high viscosity in the melted phase causes poor impregnation. In this study, surface treatment methods, ie, coupling agents with plasma treatment on wood fibers, were applied to increase the...

Read More thumbnail image: The effect of coupling agents on the interfacial properties of woodfiberreinforced polyimide composites

Exploring the mechanism of Jieduquyuziyin prescription on systemic lupus erythematosus by GC–MS‐based urine metabolomics

Published: Oct 19, 2017

Author(s): Jing Wei, Jun Gao, Xinghong Ding

Journal: Biomedical Chromatography

Abstract A urine metabolomics method based on gas chromatography–mass spectrometry was developed in order to investigate the metabolite characteristics of systemic lupus erythematosus (SLE) and the therapeutic effects of Jieduquyuziyin prescription. The urinary metabolic profiles in urine specimens of the SLE model mice (MRL/lpr) group, prednisone acetate‐treated SLE mouse group, Jieduquyuziyin prescription‐treated SLE mouse group,...

Read More thumbnail image: Exploring the mechanism of Jieduquyuziyin prescription on systemic lupus erythematosus by GCMSbased urine metabolomics

Density‐weighted concentric rings k ‐space trajectory for 1 H magnetic resonance spectroscopic imaging at 7 T

Published: Oct 18, 2017

Author(s): Mark Chiew, Wenwen Jiang, Brian Burns, Peder Larson, Adam Steel, Peter Jezzard, M. Albert Thomas, Uzay E. Emir

Journal: NMR in Biomedicine

It has been shown that density‐weighted (DW) k‐space sampling with spiral and conventional phase encoding trajectories reduces spatial side lobes in magnetic resonance spectroscopic imaging (MRSI). In this study, we propose a new concentric ring trajectory (CRT) for DW‐MRSI that samples k‐space with a density that is proportional to a spatial, isotropic Hanning window. The properties of two different DW‐CRTs were compared against a radially...

Read More thumbnail image: Densityweighted concentric rings k space trajectory for 1 H magnetic resonance spectroscopic imaging at 7T

Simultaneous imaging of hyperpolarized [1,4‐ 13 C 2 ]fumarate, [1‐ 13 C]pyruvate and 18 F–FDG in a rat model of necrosis in a clinical PET/MR scanner

Published: Oct 18, 2017

Author(s): Abubakr Eldirdiri, Andreas Clemmensen, Sean Bowen, Andreas Kjær, Jan Henrik Ardenkjær‐Larsen

Journal: NMR in Biomedicine

A co‐polarization scheme for [1,4‐13C2]fumarate and [1‐13C]pyruvate is presented to simultaneously assess necrosis and metabolism in rats with hyperpolarized 13C magnetic resonance (MR). The co‐polarization was performed in a SPINlab polarizer. In addition, the feasibility of simultaneous positron emission tomography (PET) and MR of small animals with a clinical PET/MR scanner is demonstrated. The hyperpolarized metabolic MR and PET was demonstrated...

Read More thumbnail image: Simultaneous imaging of hyperpolarized 14 13 C 2 fumarate 1 13 Cpyruvate and 18 FFDG in a rat model of necrosis in a clinical PETMR scanner

The role of magnetization transfer in the observed contrast in T 1 weighted imaging under clinical setups

Published: Oct 18, 2017

Author(s): U. Eliav, G. Navon

Journal: NMR in Biomedicine

In T1 weighted magnetic resonance imaging of brain and spinal cord in the clinical setting, the white matter (WM) appears with greater intensity than the gray matter (GM). This contrast has been assigned to differences in T1 values. In these experiments the RF pulses are too long to excite both the water and the species with restricted motion of the protons (SRMP). In in vitro studies using short RF pulses, the contrast is reversed, with greater...

Read More thumbnail image: The role of magnetization transfer in the observed contrast in T 1 weighted imaging under clinical setups

Nuclear magnetic relaxation dispersion of murine tissue for development of T 1 ( R 1 ) dispersion contrast imaging

Published: Oct 18, 2017

Author(s): Yonathan T. Araya, Francisco Martínez‐Santiesteban, William B. Handler, Chad T. Harris, Blaine A. Chronik, Timothy J. Scholl

Journal: NMR in Biomedicine

This study quantified the spin–lattice relaxation rate (R1) dispersion of murine tissues from 0.24 mT to 3 T. A combination of ex vivo and in vivo spin–lattice relaxation rate measurements were acquired for murine tissue. Selected brain, liver, kidney, muscle, and fat tissues were excised and R1 dispersion profiles were acquired from 0.24 mT to 1.0 T at 37 °C, using a fast field‐cycling MR (FFC‐MR) relaxometer. In vivo R1 dispersion profiles of...

Read More thumbnail image: Nuclear magnetic relaxation dispersion of murine tissue for development of T 1  R 1  dispersion contrast imaging

Simultaneous LC–MS/MS analysis of eicosanoids and related metabolites in human serum, sputum and BALF

Published: Oct 17, 2017

Author(s): Rhishikesh Thakare, Yashpal S. Chhonker, Nagsen Gautam, Amy Nelson, Richard Casaburi, Gerard Criner, Mark T. Dransfield, Barry Make, Kendra K. Schmid, Stephen I. Rennard, Yazen Alnouti

Journal: Biomedical Chromatography

Abstract The differences among individual eicosanoids in eliciting different physiological and pathological responses are largely unknown because of the lack of valid and simple analytical methods for the quantification of individual eicosanoids and their metabolites in serum, sputum and bronchial alveolar lavage fluid (BALF). Therefore, a simple and sensitive LC–MS/MS method for the simultaneous quantification of 34 eicosanoids in...

Read More thumbnail image: Simultaneous LCMSMS analysis of eicosanoids and related metabolites in human serum sputum and BALF

Global quantification of phosphoproteins combining metabolic labeling and gel‐based proteomics in B. pumilus

Published: Oct 17, 2017

Author(s): Christian Hentschker, Carolin Dewald, Andreas Otto, Knut Büttner, Michael Hecker, Dörte Becher

Journal: ELECTROPHORESIS

Abstract Differential proteomics targeting the protein abundance is commonly used to follow changes in biological systems. Differences in localization and degree of post‐translational modifications of proteins including phosphorylations are of tremendous interest due to the anticipated role in molecular regulatory processes. Because of their particular low abundance in prokaryotes, identification and quantification of protein...

Read More thumbnail image: Global quantification of phosphoproteins combining metabolic labeling and gelbased proteomics in B_ pumilus

On gel electrophoresis of dielectric charged particles with hydrophobic surface: A combined theoretical and numerical study

Published: Oct 17, 2017

Author(s): Partha Sarathi Majee, Somnath Bhattacharyya, Partha Pratim Gopmandal, Hiroyuki Ohshima

Journal: ELECTROPHORESIS

Abstract A theoretical study on the gel electrophoresis of a charged particle incorporating the effects of dielectric polarization and surface hydrophobicity at the particle–liquid interface is made. A simplified model based on the weak applied field and low charge density assumption is also presented and compared with the full numerical model for a nonpolarizable particle to elucidate the nonlinear effects such as double layer...

Read More thumbnail image: On gel electrophoresis of dielectric charged particles with hydrophobic surface A combined theoretical and numerical study

Comparison of a polymeric pseudostationary phase in EKC with ODS stationary phase in RP‐HPLC

Published: Oct 17, 2017

Author(s): Xinjiong Ni, Min Zhang, Xiaoping Xing, Yuhua Cao, Guangqun Cao

Journal: ELECTROPHORESIS

Abstract Poly(stearyl methacrylate‐co‐methacrylic acid) (P(SMA‐co‐MAA)) was induced as pseudostationary phase (PSP) in electrokinetic chromatography (EKC). The n‐octadecyl groups in SMA were the same as that in octadecylsilane (ODS) C18 column. Thus, the present work focused on the comparison of selectivity between polymeric PSP and ODS stationary phase (SP), and the effect of organic modifiers on the selectivity of polymeric PSP and ODS ...

Read More thumbnail image: Comparison of a polymeric pseudostationary phase in EKC with ODS stationary phase in RPHPLC

Development of bufferless gel electrophoresis chip for easy preparation and rapid DNA separation

Published: Oct 17, 2017

Author(s): Sergiy Oleksandrov, Abdurazak Aman, Wanyoung Lim, Younghee Kim, Nam Ho Bae, Kyoung G. Lee, Seok Jae Lee, Sungsu Park

Journal: ELECTROPHORESIS

Abstract This work presents a handy, fast, and compact bufferless gel electrophoresis chip (BGEC), which consists of precast agarose gel confined in a disposable plastic body with electrodes. It does not require large volumes of buffer to fill reservoirs, or the process of immersing the gel in the buffer. It withstands voltages up to 28.4 V/cm, thereby allowing DNA separation within 10 min with a similar separation capability...

Read More thumbnail image: Development of bufferless gel electrophoresis chip for easy preparation and rapid DNA separation

Nonlinear classification of commercial Mexican tequilas

Published: Oct 17, 2017

Author(s): Jose Manuel Andrade, Davide Ballabio, Maria Paz Gómez‐Carracedo, Guadalupe Pérez‐Caballero

Journal: Journal of Chemometrics

Abstract Discriminant partial least squares (PLS‐DA)—a de facto standard classification method—was found to behave poorly when 3 classes of tequilas were modeled to study a collection of 170 commercial Mexican spirits measured by UV‐Vis spectroscopy. This result was compared with other linear and nonlinear supervised classification methods (PLS with variable selection by SRI index and genetic algorithms; kernel‐PLS—modified in this...

Read More thumbnail image: Nonlinear classification of commercial Mexican tequilas
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