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The quality is in the eye of the beholder: The perspective of FTIR and UV resonant Raman spectroscopies on extracted nucleic acids

Published: Jan 30, 2018

Author(s): P. Zucchiatti, K. Latella, G. Birarda, L. Vaccari, B. Rossi, A. Gessini, C. Masciovecchio, F. D'Amico

Journal: Journal of Raman Spectroscopy

Abstract The quality of a sample has always to be considered with respect to its purposes and to the technique used for assessing it. The aim of this work is to point out the most common interfering agents that vibrational spectroscopists may find when analyzing nucleic acids extracted from cellular cultures. Fourier transformed infrared and ultraviolet‐resonant Raman measurements have been carried out on DNA and RNA samples...

Read More thumbnail image: The quality is in the eye of the beholder The perspective of FTIR and UV resonant Raman spectroscopies on extracted nucleic acids

Raman spectroscopic studies across the ferroelectric transition in cobalt substituted dimethyl amine manganese formate

Published: Jan 30, 2018

Author(s): M. Premila, A. Bharathi, R. Rajaraman, Shamima Hussain, P. D. Babu, C. S. Sundar, G. Amarendra

Journal: Journal of Raman Spectroscopy

Abstract Temperature‐dependent Raman studies, across the ferroelectric transition, Tc, in the metal organic framework material, [(CH3)2NH2][Mn(HCOO)3]—DMMn, and its cobalt (Co) doped analogues have been carried out to look for the changes in the lattice and intramolecular modes associated with the orientational ordering of the central dimethyl ammonium cation (DMA+) driven by the hydrogen‐bonded interaction between the DMA cation and the formate anion. A...

Read More thumbnail image: Raman spectroscopic studies across the ferroelectric transition in cobalt substituted dimethyl amine manganese formate

Sequentially shifted excitation: A tool for suppression of laser‐induced fluorescence in mineralogical applications using portable Raman spectrometers

Published: Jan 30, 2018

Author(s): Adam Culka, Jan Jehlička

Journal: Journal of Raman Spectroscopy

Abstract Laser‐induced fluorescence is a phenomenon that can be encountered in the Raman spectra of minerals, and it complicates the acquisition of high quality Raman spectra when using portable instruments. A novel portable Raman spectrometer utilizing sequentially shifted excitation was used for analyses of the minerals anhydrite, apatite, and zircon that frequently exhibit laser‐induced fluorescence, especially when 785 nm...

Read More thumbnail image: Sequentially shifted excitation A tool for suppression of laserinduced fluorescence in mineralogical applications using portable Raman spectrometers

Preparation of β‐cyclodextrin‐gold nanoparticles modified open tubular column for capillary electrochromatographic separation of chiral drugs

Published: Jan 30, 2018

Author(s): Li Zhou, Shenmeng Jiang, Xue Zhang, Linlin Fang, Xingjie Guo

Journal: ELECTROPHORESIS

Abstract In this paper, β‐cyclodextrin (β‐CD) modified gold nanoparticles (AuNPs) coated open tubular column (OT column) was prepared for capillary electrochromatography. The open tubular column was constructed through self‐assembly of gold nanoparticles on 3‐mercaptopropyl‐trimethoxysilane (MPTMS) prederivatized capillary and subsequent modification of thiols β‐cyclodextrin (SH‐β‐CD). Scanning electron microscopy (SEM),...

Read More thumbnail image: Preparation of cyclodextringold nanoparticles modified open tubular column for capillary electrochromatographic separation of chiral drugs

Performance of the Early Access AmpliSeq™ Mitochondrial Panel with degraded DNA samples using the Ion Torrent™ platform

Published: Jan 30, 2018

Author(s): Ka Tak Wai, Mark Barash, Peter Gunn

Journal: ELECTROPHORESIS

Abstract The Early Access AmpliSeq™ Mitochondrial Panel amplifies whole mitochondrial genomes for phylogenetic and kinship identifications, using Ion Torrent™ technology. There is currently limited information on its performance with degraded DNA, a common occurrence in forensic samples. This study evaluated the performance of the Panel with DNA samples degraded in vitro, to mimic conditions commonly found in forensic...

Read More thumbnail image: Performance of the Early Access AmpliSeq Mitochondrial Panel with degraded DNA samples using the Ion Torrent platform

Determination of cycloserine in microdialysis samples using liquid chromatography–tandem mass spectrometry with benzoyl chloride derivatization

Published: Jan 29, 2018

Author(s): Wenjing Zhang, Sihui Wan, Lizhi Chen, Xuebin Wang, Zhuo Wang, Yi Huang

Journal: Biomedical Chromatography

Abstract A new method for the analysis of cycloserine (4‐amino‐3‐isoxazolidinone, CYC) in rat microdialysis samples has been developed. This method consists of derivatizing the CYC with benzoyl chloride, which transforms primary amines into highly stable derivatives. An attractive feature of this method was that the derivatization reaction is straightforward and can be completed within 10 min. The formed derivative, in contrast to...

Read More thumbnail image: Determination of cycloserine in microdialysis samples using liquid chromatographytandem mass spectrometry with benzoyl chloride derivatization

Development and validation of LC‐MS/MS method for simultaneous determination of sofosbuvir and daclatasvir in human Plasma: Application to pharmacokinetic study

Published: Jan 29, 2018

Author(s): Ola M. Abdallah, Ahmed M. Abdel‐Megied, Amira S. Gouda

Journal: Biomedical Chromatography

Abstract A simple and highly sensitive liquid chromatography–tandem mass spectrometry (LC‐MS/MS) bioanalytical method was developed and fully validated for the first time for the simultaneous determination of newly discovered antiviral drugs, namely sofosbuvir (SOF) and daclatasvir (DAC) in human plasma. Tadalafil (TAD) was used as internal standard (IS). SOF, DAC and TAD (IS) were extracted from plasma using liquid–liquid...

Read More thumbnail image: Development and validation of LCMSMS method for simultaneous determination of sofosbuvir and daclatasvir in human Plasma Application to pharmacokinetic study

Purification of angiotensin‐converting enzyme from human plasma and investigation of the effect of some active ingredients isolated from Nigella sativa L. extract on the enzyme activity

Published: Jan 29, 2018

Author(s): Zehra Basi, Vedat Turkoglu

Journal: Biomedical Chromatography

Abstract In the present study, one‐step purification of angiotensin‐converting enzyme (ACE, peptidyldipeptidase A, EC 3.4.15.1), responsible for regulation of blood pressure, was achieved using affinity chromatography from human plasma. The enzyme was purified 12,860‐fold with a specific activtiy of 5080 EU/mg protein. Optimum temperature and pH were determined for the enzyme as 35–40°C and pH 7.4–7.5, respectively. The purity of...

Read More thumbnail image: Purification of angiotensinconverting enzyme from human plasma and investigation of the effect of some active ingredients isolated from Nigella sativa L_ extract on the enzyme activity

Simultaneous quantification of T4, T3, rT3, 3,5‐T2 and 3,3′‐T2 in larval zebrafish ( Danio rerio ) as a model to study exposure to polychlorinated biphenyls

Published: Jan 29, 2018

Author(s): Xiaopeng Chen, Kyla M. Walter, Galen W. Miller, Pamela J. Lein, Birgit Puschner

Journal: Biomedical Chromatography

Abstract Environmental toxicants that interfere with thyroid hormone (TH) signaling can impact growth and development in animals and humans. Zebrafish represent a model to study chemically induced TH disruption, prompting the need for sensitive detection of THs. Simultaneous quantification of 3,3′,5‐triiodo‐l‐thyronine (T3), thyroxine (T4), 3,3′,5′‐triiodo‐l‐thyronine (rT3), 3,5‐diiodo‐l‐thyronine (3,5‐T2) and 3,3′‐diiodo‐l‐thyronine (3,3′‐T2)...

Read More thumbnail image: Simultaneous quantification of T4 T3 rT3 35T2 and 33T2 in larval zebrafish  Danio rerio  as a model to study exposure to polychlorinated biphenyls

Characterization and application of a lanthanide‐based metal–organic framework in the development and validation of a matrix solid‐phase dispersion procedure for pesticide extraction on peppers (Capsicum annuum L.) with gas chromatography–mass spectrometry

Published: Jan 26, 2018

Author(s): Alysson Santos Barreto, Paula de Cássia da Silva Andrade, Jéssica Meira Farias, Adalberto Menezes Filho, Gilberto Fernandes de Sá, Severino Alves Júnior

Journal: Journal of Separation Science

Abstract The metal–organic framework [(La0.9Sm0.1)2(DPA)3(H2O)3]∞ was synthetized and characterized by X‐ray diffractometry, differential thermogravimetric analysis, and infrared spectroscopy. The material was tested for the development and validation of a matrix solid‐phase dispersion procedure for extraction of atrazine, bifenthrin, bromuconazole, clofentezine, fenbuconazole, flumetralin, procymidone, and pirimicarb, from peppers, ...

Read More thumbnail image: Characterization and application of a lanthanidebased metalorganic framework in the development and validation of a matrix solidphase dispersion procedure for pesticide extraction on peppers Capsicum annuum L_ with gas chromatographymass spectrometry

Comparison of commercial organic polymer‐based and silica‐based monolithic columns using mixtures of analytes differing in size and chemistry

Published: Jan 26, 2018

Author(s): Olga Vyviurska, Yongqin Lv, Benjamin F. Mann, Frantisek Svec

Journal: Journal of Separation Science

Abstract Commercially available silica‐based monolithic columns Chromolith RP‐8e, Chromolith RP‐18, and Chromolith HR RP‐18, and polymer‐based monolithic columns ProSwift RP‐1S, ProSwift RP‐2H, and ProSwift RP‐3U varying in pore size and bonded phase have been tested for the fast separation of selected sets of analytes. These mixtures of analytes included small molecules (uracil, caffeine, 1‐phenylethanol, butyl paraben, and...

Read More thumbnail image: Comparison of commercial organic polymerbased and silicabased monolithic columns using mixtures of analytes differing in size and chemistry

Dispersion‐assisted quick and simultaneous extraction of 30 pesticides from alcoholic and non‐alcoholic drinks with the aid of experimental design

Published: Jan 26, 2018

Author(s): Rakesh Roshan Jha, Nivedita Singh, Rupender Kumari, Devendra Kumar Patel

Journal: Journal of Separation Science

Abstract The presence of pesticides in food items and beverages is a big threat to humankind, and their quantitative estimation with high precision and accuracy is always a challenge for analytical chemists. Hence, a simple and rapid method is proposed for the simultaneous determination of 30 pesticides in beverages (alcoholic and non‐alcoholic drinks). The proposed method hyphenated with triple quadrupole liquid chromatography mass...

Read More thumbnail image: Dispersionassisted quick and simultaneous extraction of 30 pesticides from alcoholic and nonalcoholic drinks with the aid of experimental design

Determination and dissipation of afidopyropen and its metabolite in wheat and soil using QuEChERS–UHPLC–MS/MS

Published: Jan 26, 2018

Author(s): Yajie Chen, Mingcheng Guo, Xingang Liu, Jun Xu, Fengshou Dong, Xiaohu Wu, Baotong Li, Yongquan Zheng

Journal: Journal of Separation Science

Abstract The dissipations of afidopyropen and its metabolite in wheat plant and soil were determined using a quick, easy, cheap, effective, rugged, and safe method with ultra‐high performance liquid chromatography and tandem mass spectrometry under a field ecosystem. The limits of quantification were estimated for both target compounds as 0.001 mg/kg. The recoveries of afidopyropen and its metabolite ranged from 94 to 114%...

Read More thumbnail image: Determination and dissipation of afidopyropen and its metabolite in wheat and soil using QuEChERSUHPLCMSMS

Rapid characterization of the absorbed chemical constituents of Tangzhiqing formula following oral administration using UHPLC–Q‐TOF‐MS

Published: Jan 26, 2018

Author(s): Xiao‐Lei Wu, Ming‐Jiang Wu, Xin‐Ze Chen, Hong‐Min Zhang, Li‐Qin Ding, Fu‐Ying Tian, Xiao‐Meng Fu, Feng Qiu, De‐Qin Zhang

Journal: Journal of Separation Science

Abstract Tangzhiqing formula, a Chinese herbal formula, is used for the treatment of type II diabetes and prediabetes. Although its effectiveness has been certified by clinical use, its absorbed chemical constituents are not comprehensively represented. Thence, in order to reveal potential bioactive components and metabolism of Tangzhiqing formula, an ultra‐high performance liquid chromatography with quadrupole time‐of‐flight mass...

Read More thumbnail image: Rapid characterization of the absorbed chemical constituents of Tangzhiqing formula following oral administration using UHPLCQTOFMS

In situ derivatization and hollow‐fiber liquid‐phase microextraction to determine sulfonamides in water using UHPLC with fluorescence detection

Published: Jan 26, 2018

Author(s): Lihua Yang, Yang Shi, Jinjin Li, Tiangang Luan

Journal: Journal of Separation Science

Abstract A sensitive method for determining sulfonamides in water was developed and validated through in situ derivatization and hollow‐fiber liquid‐phase microextraction with ultra‐high performance liquid chromatography and fluorescence detection. The target sulfonamides were sulfadiazine, sulfacetamide, sulfamerazine, sulfamethazine, sulfamethoxypyridazine, sulfachloropyridazine, sulfamethoxazole, and sulfisoxazole. Following in...

Read More thumbnail image: In situ derivatization and hollowfiber liquidphase microextraction to determine sulfonamides in water using UHPLC with fluorescence detection

Magnetic iron(III)‐based framework composites for the magnetic solid‐phase extraction of fungicides from environmental water samples

Published: Jan 26, 2018

Author(s): Yan‐Feng Huang, Qiao‐Huan Liu, Kang Li, Ying Li, Na Chang

Journal: Journal of Separation Science

Abstract We adopted a facile hydrofluoric acid‐free hydro‐/solvothermal method for the preparation of four magnetic iron(III)‐based framework composites (MIL‐101@Fe3O4‐COOH, MIL‐101‐NH2@Fe3O4‐COOH, MIL‐53@Fe3O4‐COOH, and MIL‐53‐NH2@Fe3O4‐COOH). The obtained four magnetic iron(III)‐based framework composites were applied to magnetic separation and enrichment of the fungicides (prochloraz, myclobutanil, tebuconazole, and iprodione) from...

Read More thumbnail image: Magnetic ironIIIbased framework composites for the magnetic solidphase extraction of fungicides from environmental water samples

Cellulose tris‐(3,5‐dimethylphenylcarbamate)‐based chiral stationary phase for the enantioseparation of drugs in supercritical fluid chromatography: comparison with HPLC

Published: Jan 26, 2018

Author(s): Květa Kalíková, Monika Martínková, Martin G. Schmid, Eva Tesařová

Journal: Journal of Separation Science

Abstract A cellulose tris‐(3,5‐dimethylphenylcarbamate)‐based chiral stationary phase was studied as a tool for the enantioselective separation of 21 selected analytes with different pharmaceutical and physicochemical properties. The enantioseparations were performed using supercritical fluid chromatography. The effect of the mobile phase composition was studied. Four different additives (diethylamine, triethylamine, isopropylamine,...

Read More thumbnail image: Cellulose tris35dimethylphenylcarbamatebased chiral stationary phase for the enantioseparation of drugs in supercritical fluid chromatography comparison with HPLC

Determination of 3‐chloro‐1,2‐propanediol in polyamideamine epichlorohydrin resin solution by reaction‐based headspace gas chromatography

Published: Jan 26, 2018

Author(s): Ning Yan, Xiao‐Fang Wan, Xin‐Sheng Chai, Run‐Quan Chen

Journal: Journal of Separation Science

Abstract We report on a headspace gas chromatographic method for determining the content of 3‐chloro‐1,2‐propanediol in polyamideamine epichlorohydrin resin solution. It was based on quantitatively converting 3‐chloro‐1,2‐propanediol to formaldehyde by periodate oxidation in a closed headspace sample vial at a room temperature for 10 min, and then to methanol by borohydride reduction at 90°C for 40 min followed by the...

Read More thumbnail image: Determination of 3chloro12propanediol in polyamideamine epichlorohydrin resin solution by reactionbased headspace gas chromatography

Snapshot‐CEST: Optimizing spiral‐centric‐reordered gradient echo acquisition for fast and robust 3D CEST MRI at 9.4 T

Published: Jan 26, 2018

Author(s): Moritz Zaiss, Philipp Ehses, Klaus Scheffler

Journal: NMR in Biomedicine

Gradient echo (GRE)‐based acquisition provides a robust readout method for chemical exchange saturation transfer (CEST) at ultrahigh field (UHF). To develop a snapshot‐CEST approach, the transient GRE signal and point spread function were investigated in detail, leading to optimized measurement parameters and reordering schemes for fast and robust volumetric CEST imaging. Simulation of the transient GRE signal was used to determine the...

Read More thumbnail image: SnapshotCEST Optimizing spiralcentricreordered gradient echo acquisition for fast and robust 3D CEST MRI at 9_4T

Efficient preparative separation of β‐cypermethrin stereoisomers by supercritical fluid chromatography with a two‐step combined strategy

Published: Jan 25, 2018

Author(s): Yilun Yan, Jun Fan, Yecai Lai, Jianfeng He, Dong Guo, Hui Zhang, Weiguang Zhang

Journal: Journal of Separation Science

Abstract An efficient two‐step method has been developed for the separation of β‐cypermethrin stereoisomers by supercritical fluid chromatography with polysaccharide chiral stationary phases. With respect to retention, selectivity, and resolution of β‐cypermethrin, the effects of chiral stationary phases, cosolvents, mobile phases, and column temperature have been studied in detail. Through a two‐step separation, β‐cypermethrin was...

Read More thumbnail image: Efficient preparative separation of cypermethrin stereoisomers by supercritical fluid chromatography with a twostep combined strategy
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