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Optimization of a capillary zone electrophoresis–contactless conductivity detection method for the determination of nisin

Published: Jul 13, 2018

Author(s): Tomas Drevinskas, Mantas Stankevičius, Kristina Bimbiraitė‐Survilienė, Gintarė Naujokaitytė, Vilma Kaškonienė, Kristina Kondrotienė, Loreta Šernienė, Olga Kornyšova, Mindaugas Malakauskas, Audrius Maruška

Journal: ELECTROPHORESIS

Abstract Determination of natural preservatives using electrophoretic or chromatographic techniques in fermented milk products is a complex task due to the following reasons: (i) the concentrations of the analytes can be below the detection limits, (ii) complex matrix and comigrating/coeluting compounds in the sample can interfere with the analytes of the interest, (iii) low recovery of the analytes, and (iv) the necessity of...

Read More thumbnail image: Optimization of a capillary zone electrophoresiscontactless conductivity detection method for the determination of nisin

Compensation of the baseline temperature fluctuations for autonomous CE–C4D instrument working in harsh environments

Published: Jul 13, 2018

Author(s): Tomas Drevinskas, Laimutis Telksnys, Audrius Maruška, Jelena Gorbatsova, Mihkel Kaljurand

Journal: ELECTROPHORESIS

Abstract One of the main problems of the remote complex sample analysis instrumentation is that such systems are susceptible to temperature fluctuations. Temperature regulation is energetically ineffective, and it is not used in most of the field portable analytical systems. Separations performed in a changing temperature environment provide electropherograms with considerable baseline fluctuations, resulting in significant errors...

Read More thumbnail image: Compensation of the baseline temperature fluctuations for autonomous CEC4D instrument working in harsh environments

Enantioselective separation of twelve pairs of enantiomers on polysaccharide‐based chiral stationary phases and thermodynamic analysis of separation mechanism

Published: Jul 13, 2018

Author(s): Bolin Zhu, Yaqi Yao, Miaoduo Deng, Zhen Jiang, Qing Li

Journal: ELECTROPHORESIS

Abstract The enantioseparation of twelve pairs of structurally related 1‐aryl‐1‐indanone derivatives was studied in the normal‐phase mode using three different polysaccharide‐type chiral stationary phases, namely Chiralpak IB, Chiralpak IC, and Chiralpak ID. n‐Hexane/2‐propanol and n‐hexane/ethanol were employed as mobile phases. Among all the investigated chiral columns, Chiralpak IC exhibited the most universal and the best...

Read More thumbnail image: Enantioselective separation of twelve pairs of enantiomers on polysaccharidebased chiral stationary phases and thermodynamic analysis of separation mechanism

Structural damage and ion‐channelling effects in a single‐crystal Si layer modified by medium‐heavy ions

Published: Jul 13, 2018

Author(s): R. Mikšová, A. Macková, A. Jagerová, R. Yatskiv

Journal: Surface and Interface Analysis

Structural modification after medium‐heavy ion irradiation was characterised by Rutherford backscattering spectrometry in the channelling mode (RBS‐C) for silicon‐on‐insulator (SOI) material. Silicon on insulator was irradiated using C+, 2+, N+, 2+, and O+, 2+ ions at fluences of 1 × 1014 and 1 × 1015 cm−2 and energies of 0.4, 3, and 5 MeV to follow the interplay of electronic and nuclear stopping and its influence on damage ...

Read More thumbnail image: Structural damage and ionchannelling effects in a singlecrystal Si layer modified by mediumheavy ions

Commentary regarding: “The effect of simulated space radiation on the N‐glycosylation of human immunoglobulin G1”

Published: Jul 13, 2018

Author(s): Joseph John Bevelacqua, S.M.J. Mortazavi

Journal: ELECTROPHORESIS

Abstract Deep space missions, including Mars voyages, are an important area of research. Protection of astronauts’ health during these long‐term missions is of paramount importance. The paper authored by Szarka et al. entitled “The effect of simulated space radiation on the N‐glycosylation of human immunoglobulin G1” is indeed a step forward in this effort. Despite numerous strengths, there are some shortcomings in this paper including an...

Read More thumbnail image: Commentary regarding The effect of simulated space radiation on the Nglycosylation of human immunoglobulin G1

Micropillar‐based microfluidic device to regulate neurite networks of uniform‐sized neurospheres

Published: Jul 13, 2018

Author(s): Da Eun Kim, Jong Min Lee, Christian D. Ahrberg, Mohammed R. Shaker, Ju‐Hyun Lee, Woong Sun, Bong Geun Chung

Journal: ELECTROPHORESIS

Abstract The inability of neurons to undergo mitosis renders damage to the central or peripheral nervous system. Neural stem cell therapy could provide a path for treating the neurodegenerative diseases. However, reliable and simple tools for the developing and testing neural stem cell therapy are still required. Here, we show the development of a micropillar‐based microfluidic device to trap the uniform‐sized neurospheres. The...

Read More thumbnail image: Micropillarbased microfluidic device to regulate neurite networks of uniformsized neurospheres

Analysis of terizidone in plasma using HPLC‐UV method and its application in a pharmacokinetic study of patients with drug‐resistant tuberculosis

Published: Jul 12, 2018

Author(s): Mwila Mulubwa, Pierre Mugabo

Journal: Biomedical Chromatography

Abstract A chromatographic method has been developed and validated for the first time for analysis of terizidone in plasma. Terizidone was extracted from plasma by protein precipitation using a mixture of acetonitrile and methanol (1:1, v/v). The chromatographic separation was achieved with a gradient of acetonitrile and water both containing 0.1% formic acid on a Supelco Discovery® HS C18 (150 × 4.6 mm, 5 μm) reversed‐phase column. Propranolol...

Read More thumbnail image: Analysis of terizidone in plasma using HPLCUV method and its application in a pharmacokinetic study of patients with drugresistant tuberculosis

Temperature‐dependent absorption lines observation in Raman spectra of SmFe 3 (BO 3 ) 4 ferroborate

Published: Jul 10, 2018

Author(s): Evgeniya Moshkina, Irina Gudim, Vladislav Temerov, Alexander Krylov

Journal: Journal of Raman Spectroscopy

Abstract The paper demonstrates possibilities of observation and thermal dependency study of the absorption lines as a co‐product of Raman spectroscopy study in SmFe3 (BO3)4 ferroborate. Raman spectra of the ferroborate were studied in a wide temperature range (T = 10÷300 K). Temperature‐dependent absorption lines sensitive to the magnetic phase transition have been observed in Raman spectra at two spectral ranges. ...

Read More thumbnail image: Temperaturedependent absorption lines observation in Raman spectra of SmFe 3 BO 3  4 ferroborate

In‐situ high‐temperature Raman spectroscopic studies of the vibrational characteristics and microstructure evolution of sodium tungstate dihydrate crystal during heating and melting

Published: Jul 10, 2018

Author(s): Jian Wang, Jinglin You, Min Wang, Liming Lu, Alexander A. Sobol, Songming Wan

Journal: Journal of Raman Spectroscopy

Abstract In‐situ studies of the vibrational characteristics and microstructure evolution of the Na2WO4·2H2O (sodium tungstate dihydrate) crystal during the temperature‐induced solid‐state phase transformation and melting process were carried out using high‐temperature Raman spectroscopic technique. Results showed that the thermal decomposition process of the Na2WO4·2H2O crystal takes place mainly within the temperature range of 348–383 K,...

Read More thumbnail image: Insitu hightemperature Raman spectroscopic studies of the vibrational characteristics and microstructure evolution of sodium tungstate dihydrate crystal during heating and melting

Selecting microhaplotypes optimized for different purposes

Published: Jul 10, 2018

Author(s): Kenneth K. Kidd, Andrew J. Pakstis, William C. Speed, Robert Lagace, Sharon Wootton, Joseph Chang

Journal: ELECTROPHORESIS

Abstract Massively parallel sequencing is transforming forensic work by allowing various useful forensic markers, such as STRPs and SNPs, to be multiplexed providing information on ancestry, individual and familial identification, phenotypes for eye/hair/skin pigmentation, and the deconvolution of mixtures. Microhaplotypes also become feasible with massively parallel sequencing, these are DNA segments (smaller than 300 nucleotides)...

Read More thumbnail image: Selecting microhaplotypes optimized for different purposes

Proof of active cannabis use comparing 11‐hydroxy‐∆9‐tetrahydrocannabinol with 11‐nor‐9‐carboxy‐tetrahydrocannabinol concentrations

Published: Jul 10, 2018

Author(s): Thomas Franz, Gisela Skopp, Gerlinde Schwarz, Frank Musshoff

Journal: Drug Testing and Analysis

Abstract Testing hair for cannabis use has increasingly been scrutinised due to exposure to second‐hand smoke or environmental contamination. Confirmation of drug use involving detection of metabolites such as 11‐nor‐9‐carboxy‐delta‐9‐tetrahydrocannabinol (THC‐COOH) and 11‐hydroxy‐delta‐9‐tetrahydrocannabinol (THC‐OH) having very rarely been considered. We developed a new, simplified procedure with regard to expenditure of time and...

Read More thumbnail image: Proof of active cannabis use comparing 11hydroxy9tetrahydrocannabinol with 11nor9carboxytetrahydrocannabinol concentrations

Romantic restorations in the A lhambra monument: S pectroscopic characterization of decorative plasterwork in the R oyal B aths of C omares

Published: Jul 8, 2018

Author(s): Paz Arjonilla, María José Ayora‐Cañada, Ramón Rubio Domene, Elena Correa Gómez, María José Torre‐López, Ana Domínguez‐Vidal

Journal: Journal of Raman Spectroscopy

Abstract The polychrome plasterwork decorations of the Room of the Beds in the Royal Bath of Comares of the Alhambra monumental ensemble have been studied using Raman microspectroscopy and complementary techniques. This area keeps the testimony of the controversial restorations carried out in the 19th century in an attempt to imitate the lost original appearance of the authentic Nasrid plasterwork. Raman spectroscopy and energy...

Read More thumbnail image: Romantic restorations in the A lhambra monument S pectroscopic characterization of decorative plasterwork in the R oyal B aths of C omares

SERS and DFT study of 5F‐PB‐22

Published: Jul 8, 2018

Author(s): Mohammad Alkaseem, Mark Baron

Journal: Journal of Raman Spectroscopy

Abstract In this work, a joint experimental and theoretical study on the synthetic cannabinoid, 5F‐PB‐22 (1‐(5‐fluoropentyl)‐8‐quinolinyl ester‐1H‐indole‐3‐carboxylic acid) is reported. The molecular vibrations of 5F‐PB‐22 were investigated by Raman and surface‐enhanced Raman spectroscopy (SERS) spectroscopies. In parallel, quantum chemical calculations based on density functional theory (DFT) with the hybrid B3LYP...

Read More thumbnail image: SERS and DFT study of 5FPB22

Detection of erythropoiesis‐stimulating agents in a single dried blood spot

Published: Jul 5, 2018

Author(s): Gemma Reverter‐Branchat, Rosa Ventura, Mohammed Ezzel Din, Julián Mateus, Carme Pedro, Jordi Segura

Journal: Drug Testing and Analysis

Abstract The use of dried blood spots (DBS) for anti‐doping purposes would facilitate an increase in the number of blood samples because it eliminates the need for specialized personnel and involves minimal invasiveness, reduced costs, stability, and easy transportation and storage. Here, the electrophoretic methodology established by the World Anti‐Doping Agency (WADA) to detect erythropoiesis‐stimulating agents (ESAs) has been...

Read More thumbnail image: Detection of erythropoiesisstimulating agents in a single dried blood spot

Time‐resolved Raman spectroscopy for shock‐driven intramolecular electron redistribution of cyclotrimethylene trinitramine (RDX)

Published: Jul 5, 2018

Author(s): Guoyang Yu, Zhaoyang Zheng, Honglin Wu, Yangyang Zeng, Qiang Wu, Duowang Tan, Xianxu Zheng, Yunfei Song, Yanqiang Yang

Journal: Journal of Raman Spectroscopy

Abstract Shock‐driven intramolecular electron redistribution (IER) of cyclotrimethylene trinitramine (RDX) is proposed, which will be helpful for understanding the initiation and safety mechanisms of RDX materials under shock compressions. Laser‐driven shock wave was performed to generate a dynamic pressure, and time‐resolved Raman spectroscopy was used to probe the shock wave response of RDX. First‐principle calculations were...

Read More thumbnail image: Timeresolved Raman spectroscopy for shockdriven intramolecular electron redistribution of cyclotrimethylene trinitramine RDX

Surface characterisation of Escherichia coli under various conditions by near‐ambient pressure XPS

Published: Jul 5, 2018

Author(s): Marit Kjærvik, Karin Schwibbert, Paul Dietrich, Andreas Thissen, Wolfgang E. S. Unger

Journal: Surface and Interface Analysis

Bacteria are inherently in a hydrated state and therefore not compatible to ultra‐high vacuum techniques such as XPS without prior sample preparation involving freeze drying or fast freezing. This has changed with the development of near‐ambient pressure (NAP)‐XPS, which makes it possible to characterise the bacterial surface with minimal sample preparation. This paper presents NAP‐XPS measurements of Escherichia coli under various NAP...

Read More thumbnail image: Surface characterisation of Escherichia coli under various conditions by nearambient pressure XPS

An optimized microfluidic paper‐based NiOOH/Zn alkaline battery

Published: Jul 4, 2018

Author(s): Samantha Burrola, Maria Jose Gonzalez‐Guerrero, Ani Avoundjian, Frank A. Gomez

Journal: ELECTROPHORESIS

Abstract In this paper, an alkaline nickel oxide hydroxide/zinc (NiOOH/Zn) battery featuring a cellulose matrix separator between electrodes is presented. The metallic electrodes and the paper separator are inserted in a layer‐by‐layer assembly that provides mechanical stability to the system resulting in a lightweight and easy‐to‐use device. The battery was optimized for the amount of NiOOH‐ink used at the cathode (11.1 mg/cm2) and...

Read More thumbnail image: An optimized microfluidic paperbased NiOOHZn alkaline battery

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

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

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
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