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Complementarity of electrophoretic, mass spectrometric, and gene sequencing techniques for the diagnosis and characterization of congenital disorders of glycosylation

Published: Jul 4, 2018

Author(s): Arnaud Bruneel, Sophie Cholet, Valérie Drouin‐Garraud, Marie‐Line Jacquemont, Aline Cano, André Mégarbané, Coralie Ruel, David Cheillan, Thierry Dupré, Sandrine Vuillaumier‐Barrot, Nathalie Seta, François Fenaille

Journal: ELECTROPHORESIS

Abstract Congenital disorders of glycosylation (CDG) are rare autosomal genetic diseases affecting the glycosylation of proteins and lipids. Since CDG‐related clinical symptoms are classically extremely variable and nonspecific, a combination of electrophoretic, mass spectrometric, and gene sequencing techniques is often mandatory for obtaining a definitive CDG diagnosis, as well as identifying causative gene mutations and...

Read More thumbnail image: Complementarity of electrophoretic mass spectrometric and gene sequencing techniques for the diagnosis and characterization of congenital disorders of glycosylation

Preparation and evaluation of temperature and magnetic dual‐responsive molecularly imprinted polymers for the specific enrichment of formononetin

Published: Jul 4, 2018

Author(s): Yu‐Zhen Zhang, Jiawei Zhang, Ling Tan, Zhining Xia, Chong‐Zhi Wang, Lian‐Di Zhou, Qihui Zhang, Chun‐Su Yuan

Journal: Journal of Separation Science

Abstract Thermo‐responsive magnetic molecularly imprinted polymers were prepared by simple surface molecular imprinting polymerization for the selective adsorption and enrichment of formononetin from Trifolium pretense by temperature regulation. Using formononetin as a template, N‐isopropylacrylamide as the thermo‐responsive functional monomer, and methacrylic acid as an assisting functional monomer, the polymers were synthesized on the surface...

Read More thumbnail image: Preparation and evaluation of temperature and magnetic dualresponsive molecularly imprinted polymers for the specific enrichment of formononetin

Solid‐phase extraction using octadecyl‐bonded silica modified with photosynthetic pigments from Spinacia oleracea L. for the preconcentration of lead(II) ions from aqueous samples

Published: Jul 4, 2018

Author(s): Eliza Blicharska, Małgorzata Tatarczak‐Michalewska, Anita Plazińska, Wojciech Plaziński, Anna Kowalska, Anna Madejska, Monika Szymańska‐Chargot, Anna Sroka‐Bartnicka, Jolanta Flieger

Journal: Journal of Separation Science

Abstract Spinacia oleracea L. extract was immobilized on an octadecyl‐bonded silica surface to produce a new sorbent for the solid‐phase extraction of trace amounts of metal ions from aqueous neutral samples. A measurement of the metal content has been performed by using graphite furnace atomic absorption spectroscopy. The affinity of the investigated bivalent metal cations for the modified sorbent are in the order:...

Read More thumbnail image: Solidphase extraction using octadecylbonded silica modified with photosynthetic pigments from Spinacia oleracea L_ for the preconcentration of leadII ions from aqueous samples

Preparation and application of magnetic molecularly imprinted polymers for the isolation of chelerythrine from Macleaya cordata

Published: Jul 4, 2018

Author(s): Ming Zhong, Yan‐Hong Wang, Lu Wang, Rui‐Qing Long, Chun‐Lin Chen

Journal: Journal of Separation Science

Abstract A novel type of magnetic molecularly imprinted polymer was prepared for the selective enrichment and isolation of chelerythrine from Macleaya cordata (Willd) R. Br. The magnetic molecularly imprinted polymers were prepared using functional Fe3O4@SiO2 as a magnetic support, chelerythrine as template, methacrylic acid as functional monomer, and ethylene glycol dimethacrylate as cross‐linker. Density functional theory at the B3LYP/6‐31G...

Read More thumbnail image: Preparation and application of magnetic molecularly imprinted polymers for the isolation of chelerythrine from Macleaya cordata

Importance of sample preparation on reliable surface characterisation of nano‐objects: ISO standard 20579‐4

Published: Jul 4, 2018

Author(s): Donald R. Baer, Ajay S. Karakoti, Charles A. Clifford, Caterina Minelli, Wolfgang E. S. Unger

Journal: Surface and Interface Analysis

The international ISO Standard 20579‐4, dealing with the history and preparation of nano‐objects for surface analysis, has been developed to help address some of the replication and reproducibility issues caused by the fundamental nature of nano‐objects. Although all types of samples requiring surface analysis need thoughtful preparation, nano‐objects, for which many properties are controlled by their surfaces, present additional...

Read More thumbnail image: Importance of sample preparation on reliable surface characterisation of nanoobjects ISO standard 205794

Thickness and temperature‐dependent study of Co/Si interface

Published: Jul 4, 2018

Author(s): Anil Kumar, Ranjeet Brajpuriya, Priti Singh

Journal: Surface and Interface Analysis

Thin films of cobalt (10, 40, and 100 nm) are deposited on Si substrate by electron beam physical vapor deposition technique. After deposition, 4 pieces from each of the wafers of silicon substrate were cut and annealed at a temperature of 200°C, 300°C, and 400°C for 2 hours each, separately. X‐ray diffraction, atomic force microscopy, and transmission electron microscopy (TEM) are used to study the structural and morphological...

Read More thumbnail image: Thickness and temperaturedependent study of CoSi interface

Simultaneous determination of 22 phthalate esters in polystyrene food‐contact materials by ultra‐performance convergence chromatography with tandem mass spectrometry

Published: Jul 3, 2018

Author(s): Ying‐Li Fan, Ming Ma, He‐Zhen Cui, Shu Liu, Min‐Li Yang, Xiu‐Feng Hou

Journal: Journal of Separation Science

Abstract A method for the determination of 22 phthalate esters in polystyrene food‐contact materials has been established using ultraperformance convergence chromatography with tandem mass spectrometry. In this method, 22 phthalate esters were analyzed in <3.5 min on an ACQUITY Tours 1‐AA column by gradient elution. The mobile phase, the compensation solvent, the flow rate of mobile phase, column temperature, and...

Read More thumbnail image: Simultaneous determination of 22 phthalate esters in polystyrene foodcontact materials by ultraperformance convergence chromatography with tandem mass spectrometry

Preparation and application of chlorpyrifos molecularly imprinted solid‐phase microextraction probes for the residual determination of organophosphorous pesticides in fresh and dry foods

Published: Jul 3, 2018

Author(s): Jin‐Kui Ma, Xiao‐Chen Huang, Shou‐Lian Wei

Journal: Journal of Separation Science

Abstract A solid‐phase microextraction probe was prepared on the surface of a stainless‐steel wire through molecular sol–gel imprinting technology using chlorpyrifos as a template molecule, tetraethoxysilane as a sol–gel precursor, and acrylamide and β‐cyclodextrin as functional monomers. The polymer was characterized by infrared spectrometry and scanning electron microscopy. Moreover, the selectivity and the parameters including...

Read More thumbnail image: Preparation and application of chlorpyrifos molecularly imprinted solidphase microextraction probes for the residual determination of organophosphorous pesticides in fresh and dry foods

Preparation and purification of canthinone and β‐carboline alkaloids from Picrasma quassioides based on bioautography and mass‐spectrometry‐directed autopurification system

Published: Jul 3, 2018

Author(s): Na Yang, Yanhong Shi, Aizhen Xiong, Yue Zhou, Lihua Gu, Rui Wang, Li Yang, Zhengtao Wang

Journal: Journal of Separation Science

Abstract Picrasma quassioides (D. Don) Benn. is a widely used traditional Chinese medicine for anti‐inflammation and antibiosis. Canthinone and β‐carboline alkaloids are the main characteristic constituents that possess diverse pharmacological effects, such as anti‐inflammatory and anti‐infectious properties. In this study, bioautography in thin‐layer chromatography indicated that the antiradical activity compound may be alkaloids....

Read More thumbnail image: Preparation and purification of canthinone and carboline alkaloids from Picrasma quassioides based on bioautography and massspectrometrydirected autopurification system

The collective excitations and static dipole polarizability in small nanoparticles

Published: Jul 3, 2018

Author(s): J. A. Leiro

Journal: Surface and Interface Analysis

Collective dipole excitations for small clusters have been considered in the energy range close to the visible light. The absorption energies and static dipole polarizabilities are estimated. In the case of Ag8, Na18, Na20, Cs40, Mg10, Ba20, Ag9+, Na21+, and Mg11++ clusters, a semiclassical density functional method with the Thomas‐Fermi approximation has been used. Also, applications in Al6, Al7, (ZnS)3, and (ZnSe)4 will be discussed. The results...

Read More thumbnail image: The collective excitations and static dipole polarizability in small nanoparticles

LC‐QTOF characterization of non‐anthocyanic flavonoids in four Tunisian fig varieties

Published: Jul 3, 2018

Author(s): Hala Soltana, Mirko De Rosso, Houda Lazreg, Antonio Dalla Vedova, Mohamed Hammami, Riccardo Flamini

Journal: Journal of Mass Spectrometry

Abstract Flavonoids are compounds characterized by antioxidant activity, and their intake in the human diet is considered useful for health and nutrition. Non‐anthocyanic flavonoids in 4 different types of Tunisian figs belonging to the smyrna‐type Ficus carica varieties known as Kholi, Tchich Asal, Himri, and Bidhi were studied by liquid chromatography/high‐resolution mass spectrometry UHPLC‐QqTOF. Twenty‐two compounds belonging to the classes...

Read More thumbnail image: LCQTOF characterization of nonanthocyanic flavonoids in four Tunisian fig varieties

Development of an extraction method for the quantification of lignans in espresso coffee by using HPLC‐MS/MS triple quadrupole

Published: Jul 3, 2018

Author(s): Simone Angeloni, Luciano Navarini, Gianni Sagratini, Elisabetta Torregiani, Sauro Vittori, Giovanni Caprioli

Journal: Journal of Mass Spectrometry

Abstract Lignans are polyphenolic compounds that are considered phytoestrogens for their plant origins, and they possess different biological activities. Three different extraction methods, ie, “dilute and shoot”, acidic hydrolysis, and enzymatic digestion, have been compared for extracting lignans (secoisolariciresinol (SECO), matairesinol (MAT), and lariciresinol (LARI)) from espresso coffee (EC) by using high‐performance liquid...

Read More thumbnail image: Development of an extraction method for the quantification of lignans in espresso coffee by using HPLCMSMS triple quadrupole

Profiling of new psychoactive substances by using stable isotope ratio mass spectrometry: Study of the synthetic cannabinoid 5F‐PB‐22

Published: Jul 3, 2018

Author(s): S. Münster‐Müller, N. Scheid, T. Holdermann, S. Schneiders, M. Pütz

Journal: Drug Testing and Analysis

Abstract In this paper, the results of a pilot study on the profiling of the synthetic cannabinoid receptor agonist 5F‐PB‐22 (5F‐QUPIC, pentylfluoro‐1H‐indole‐3‐carboxylic acid‐8‐quinolinyl ester) via isotope ratio mass spectrometry are presented. It focuses on δ13C, δ15N and δ2H isotope ratios, which are determined using elemental analyser (EA) and high temperature elemental analyser (TC/EA) coupled to an isotope ratio mass spectrometer...

Read More thumbnail image: Profiling of new psychoactive substances by using stable isotope ratio mass spectrometry Study of the synthetic cannabinoid 5FPB22

Enantiomeric resolution of methylamphetamine and ephedrine: Does this affect the δ 13 C, δ 15 N, and δ 2 H stable isotope ratios of the product?

Published: Jul 3, 2018

Author(s): Alexandra K. Grzechnik, Adrian V. George, Linda Mitchell, Michael Collins, Helen Salouros

Journal: Drug Testing and Analysis

Abstract The use of stable isotope ratio mass spectrometry (IRMS) as a profiling tool for methylamphetamine has evolved over the last decade. Stable isotope ratios of carbon (δ13C), nitrogen (δ15N), and hydrogen (δ2H) of methylamphetamine are useful in determining the precursor used to manufacture methylamphetamine, and in many cases the synthetic origin of the methylamphetamine precursor. More recently, samples of seized methylamphetamine show...

Read More thumbnail image: Enantiomeric resolution of methylamphetamine and ephedrine Does this affect the  13 C  15 N and  2 H stable isotope ratios of the product

T‐Hg 2+ ‐T‐based satellite structured surface enhanced Raman scattering sensor for Hg 2+ detection

Published: Jul 3, 2018

Author(s): Zhenli Sun, Jingjing Du, Kebin He, Chuanyong Jing

Journal: Journal of Raman Spectroscopy

Abstract Mercury ion (Hg2+) exposure is a threat to human health. We report a plasmonic core‐satellite Fe3O4@SiO2‐Au (FA) hetero nanostructure for Hg2+ detection using surface enhanced Raman scattering based on the T‐Hg2+‐T strategy. The FA nanostructure was functionalized by a DNA aptamer, which was designed with Cy5 at the 5′ end, and used as a Raman reporter to specifically bind to Hg2+ ions. In the presence of Hg2+, DNA formed a hairpin structure,...

Read More thumbnail image: THg 2 Tbased satellite structured surface enhanced Raman scattering sensor for Hg 2 detection

A SNaPshot assay for detection of 45 mutations in the SCN5A gene in the Chinese Han Population

Published: Jul 3, 2018

Author(s): Jiaqi Wang, Xudong Wang, Zhihua Ma, Keming Yun, Jinding Liu, Deqing Chen, Zidong Liu, Jie Shi, Zeqin Li, Cairong Gao, Qiuxiang Du, Gengqian Zhang

Journal: ELECTROPHORESIS

Abstract Sudden cardiac death (SCD) occurs frequently in forensic practice and results in no visible pathological changes that can be detected in an autopsy. In recent years, the genetic background has been emphasized when examining SCD cases. The aim of this study is to establish a feasible system to detect SCD‐related genes for forensic DNA laboratories. Forty‐five reported SCD‐associated SNPs from sodium voltage‐gated channel...

Read More thumbnail image: A SNaPshot assay for detection of 45 mutations in the SCN5A gene in the Chinese Han Population

Increasing specificity of tandem mass spectrometry by laser‐induced dissociation

Published: Jul 2, 2018

Author(s): Marion Girod

Journal: Rapid Communications in Mass Spectrometry

Mass spectrometry offers an arsenal of tools for diverse proteomic investigations. This perspective article reviews some of the recent developments in the field of coupling laser‐induced dissociation with mass spectrometry (LID‐MS). Strategies involving labelling with a chromophore to induce specific photo‐absorption properties are considered, with a focus on specific amino acid derivatization. Some of the opportunities and challenges of...

Read More thumbnail image: Increasing specificity of tandem mass spectrometry by laserinduced dissociation

Review and perspectives on the applications of mass spectrometry imaging under ambient conditions

Published: Jul 2, 2018

Author(s): Consuelo J. Perez, Aafreen K. Bagga, Shamina S. Prova, Maryam Yousefi Taemeh, Demian R. Ifa

Journal: Rapid Communications in Mass Spectrometry

Ambient mass spectrometry (AMS)‐based techniques are performed under ambient conditions in which the ionization and desorption occur in the open environment allowing the direct analysis of molecules with minimal or no sample preparation. A selected group of AMS techniques demonstrate imaging capabilities that can provide information about the localization of molecules on complex sample surfaces such as biological tissues. 2D, 3D, and...

Read More thumbnail image: Review and perspectives on the applications of mass spectrometry imaging under ambient conditions

Upconversion nanoparticle bioconjugates characterized by capillary electrophoresis

Published: Jul 2, 2018

Author(s): Tereza Vaneckova, Kristyna Smerkova, Jan Zitka, David Hynek, Ondrej Zitka, Antonin Hlavacek, Frantisek Foret, Vojtech Adam, Marketa Vaculovicova

Journal: ELECTROPHORESIS

Abstract Upconversion nanoparticles (UCNPs) are an emerging class of optical materials with high potential in bioimaging due to practically no background signal and high penetration depth. Their excellent optical properties and easy surface functionalization make them perfect for conjugation with targeting ligands. In this work, capillary electrophoretic (CE) method with laser‐induced fluorescence detection was used to investigate...

Read More thumbnail image: Upconversion nanoparticle bioconjugates characterized by capillary electrophoresis

Accurate and sensitive determination of selected hormones, endocrine disruptors, and pesticides by gas chromatography–mass spectrometry after the multivariate optimization of switchable solvent liquid‐phase microextraction

Published: Jul 2, 2018

Author(s): Dotse Selali Chormey, Süleyman Bodur, Dilgeş Baskın, Merve Fırat, Sezgin Bakırdere

Journal: Journal of Separation Science

Abstract Switchable solvent liquid‐phase microextraction was combined with gas chromatography and mass spectrometry to improve the sensitivity and accuracy for the determination of selected endocrine disruptors, pesticides, and hormones. The extraction method was used to complement gas chromatography with mass spectrometry by preconcentrating analytes for trace determinations. A Box–Behnken experimental design was used to evaluate...

Read More thumbnail image: Accurate and sensitive determination of selected hormones endocrine disruptors and pesticides by gas chromatographymass spectrometry after the multivariate optimization of switchable solvent liquidphase microextraction
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