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Establishing a sensitive capillary electrophoresis‐UV method for direct determination of amino acids to evaluate vinegar quality

Published: Mar 25, 2018

Author(s): Tian Luo, Yue Dong, Shujuan He, Jing Yang, Yuming Dong

Journal: ELECTROPHORESIS

Abstract In this study, the capillary electrophoresis method with ultraviolet detection was established to directly determine amino acids in vinegar, according to the coordination interaction between amino acids (AAs) and copper ions. The online sweeping technique was combined to improve the detection sensitivity. The quality of vinegar was evaluated with AAs as parameters by United Nations Food Agriculture Organization/Word Health...

Read More thumbnail image: Establishing a sensitive capillary electrophoresisUV method for direct determination of amino acids to evaluate vinegar quality

Capillary electrophoresis in association with chemometrics approach for bitterness hop ( Humulus lupulus L .) classification

Published: Mar 25, 2018

Author(s): Lucas Mattos Duarte, Luiz Henrique Cantarino Adriano, Marcone Augusto Leal Oliveira

Journal: ELECTROPHORESIS

Abstract The precursor compounds related to the bitterness of beer are called α‐acids. These compounds are extracted from the hop, which is an important ingredient in the brewing process. These compounds were analyzed by capillary electrophoresis. The electrophoretic method used 160 mmol/L of ammonium carbonate (pH 9) as BGE (background electrolyte), a voltage of +20 kV in a capillary with 50 μm of internal diameter...

Read More thumbnail image: Capillary electrophoresis in association with chemometrics approach for bitterness hop  Humulus lupulus L _ classification

Pressurized hot water extraction of β‐glucans from Cantharellus tubaeformis

Published: Mar 25, 2018

Author(s): Paula Rodríguez‐Seoane, María Jesús González‐Muñoz, Elena Falqué, Herminia Domínguez

Journal: ELECTROPHORESIS

Abstract Cantharellus tubaeformis was processed by pressurized hot water extraction (80–240°C) with the aim of maximizing the extraction of oligomeric fractions, β‐glucans, and the in vitro antioxidant properties of the extracts. Increased severity of treatment enhanced the extraction yields above 62% at temperatures of 210ºC or higher, corresponding to the maximum β‐glucan yields. The highest antioxidant capacity was obtained at...

Read More thumbnail image: Pressurized hot water extraction of glucans from Cantharellus tubaeformis

Simultaneous isolation and preconcentration of exosomes by ion concentration polarization

Published: Mar 25, 2018

Author(s): Steven Marczak, Katherine Richards, Zeinab Ramshani, Elaine Smith, Satyajyoti Senapati, Reginald Hill, David B. Go, Hsueh‐Chia Chang

Journal: ELECTROPHORESIS

Abstract Exosomes carry microRNA biomarkers, occur in higher abundance in cancerous patients than in healthy ones, and because they are present in most biofluids, including blood and urine, these can be obtained noninvasively. Standard laboratory techniques to isolate exosomes are expensive, time consuming, provide poor purity, and recover on the order of 25% of the available exosomes. We present a new microfluidic technique to...

Read More thumbnail image: Simultaneous isolation and preconcentration of exosomes by ion concentration polarization

A SERS method for thermal neutron detection

Published: Mar 25, 2018

Author(s): Jie Sun, Kaikai Wang, Shuyan Han, Mingyue Zhang, Ying Wang, Weiping Qian, Haiqian Zhang, Jian Dong

Journal: Journal of Raman Spectroscopy

Abstract To achieve the surface‐enhanced Raman scattering (SERS) method for thermal neutron detection, 4‐mercaptophenylboronic acid (4‐MPBA), a natural boron‐containing and high intrinsic Raman‐active compound, was used as a detection material, and after the fission of boron‐10(10B) isotope capturing thermal neutrons, parts of 4‐MPBA molecules were converted into thiophenol. Based on SERS substrates of gold nanoshells, the...

Read More thumbnail image: A SERS method for thermal neutron detection

Fast microplastics identification with stimulated Raman scattering microscopy

Published: Mar 25, 2018

Author(s): Liron Zada, Heather A. Leslie, A. Dick Vethaak, Gerjen H. Tinnevelt, Jeroen J. Jansen, Johannes F. Boer, Freek Ariese

Journal: Journal of Raman Spectroscopy

Abstract The abundance of plastic products in modern society has resulted in a proliferation of small plastic particles called “microplastics” in the global environment. Currently, spectroscopic techniques such as Fourier‐transform infrared and spontaneous (i.e., conventional) Raman spectroscopy are widely employed for the identification of the plastic microparticles, but these are rather time consuming. Stimulated Raman scattering...

Read More thumbnail image: Fast microplastics identification with stimulated Raman scattering microscopy

Hydration properties and water structure in aqueous solutions of native and modified cyclodextrins by UV R aman and B rillouin scattering

Published: Mar 25, 2018

Author(s): C. Bottari, L. Comez, M. Paolantoni, S. Corezzi, F. D'Amico, A. Gessini, C. Masciovecchio, B. Rossi

Journal: Journal of Raman Spectroscopy

Abstract We have studied aqueous solutions of native and chemically modified cyclodextrins (CDs) by means of UV Raman and Brillouin scattering. Analysis of the spectral profile of the OH‐stretching Raman signal, which is sensitive to the intermolecular organization of water, reveals a remarkable reduction of the population of ordered tetrahedral water structures inside the hydration shell of substituted CDs. As a remarkable result,...

Read More thumbnail image: Hydration properties and water structure in aqueous solutions of native and modified cyclodextrins by UV R aman and B rillouin scattering

Hydration of monosaccharides studied by Raman scattering

Published: Mar 25, 2018

Author(s): Ludovica Ruggiero, Armida Sodo, Fabio Bruni, Maria Antonietta Ricci

Journal: Journal of Raman Spectroscopy

Abstract We report a Raman spectroscopy study of glucose, fructose, and mannose. The spectra have been recorded for the dry powders and for solutions in H2O and D2O and commented in the so‐called “fingerprint region” of the spectra (200–1,400 cm−1), in order to study the influence of the interaction with water on the solute vibrational modes. We have evidenced splitting of some bands, due to the presence of different anomers in solution....

Read More thumbnail image: Hydration of monosaccharides studied by Raman scattering

Simultaneous determination of residues of thiamethoxam and its metabolite clothianidin in tobacco leaf and soil using liquid chromatography‐tandem mass spectrometry

Published: Mar 25, 2018

Author(s): Banghua Meng, Yurong Yu, Qingtao Zhang, Shouyi Wang, Deyu Hu, Kankan Zhang

Journal: Biomedical Chromatography

Abstract A simple analytical method was developed to simultaneously determine thiamethoxam and its metabolite, clothianidin, in fresh tobacco leaf, soil and cured tobacco leaf using liquid chromatography with tandem mass spectrometry. Thiamethoxam and clothianidin in tobacco and soil samples were extracted with acetonitrile containing 0.1% formic acid and purified using an NH2‐SPE column. The optimized method provided good linearity with...

Read More thumbnail image: Simultaneous determination of residues of thiamethoxam and its metabolite clothianidin in tobacco leaf and soil using liquid chromatographytandem mass spectrometry

Monitoring pesticide residues in dates marketed in Al‐Qassim, Saudi Arabia using a QuEChERS methodology and liquid chromatography–tandem mass spectrometry

Published: Mar 25, 2018

Author(s): Osama I. Abdallah, Saleh S. Alamer, Abdulmajeed M. Alrasheed

Journal: Biomedical Chromatography

Abstract A sensitive, simple and rapid QuEChERS extraction method and liquid chromatography equipped with triple quadrupole mass spectrometry (LC‐MS/MS) were used to determine 42 pesticides in dates. Acidified acetonitrile and citrate buffer salts were used to extract re‐hydrated samples. Acceptable validation performances were achieved, i.e. recovery range of 70−120% and RSD values ≤20% for 42 analytes at three different...

Read More thumbnail image: Monitoring pesticide residues in dates marketed in AlQassim Saudi Arabia using a QuEChERS methodology and liquid chromatographytandem mass spectrometry

Simple model of coherent anti‐Stokes Raman scattering signals generated by means of linearly chirped ultrashort Gaussian laser pulses

Published: Mar 24, 2018

Author(s): M. Marrocco

Journal: Journal of Raman Spectroscopy

Abstract Time and frequency dependences of coherent anti‐Stokes Raman scattering (CARS) are here found analytically for the increasingly popular experimental approach where the Raman preparation and probing are realized by means of very short linearly chirped laser pulses. These are chosen with Gaussian lineshapes that, besides being rather common in ultrashort laser physics, guarantee full solution to the nonlinear scattering...

Read More thumbnail image: Simple model of coherent antiStokes Raman scattering signals generated by means of linearly chirped ultrashort Gaussian laser pulses

Chemical behavior of croconic acid coordinated to Co(II) adsorbed on silver surface

Published: Mar 24, 2018

Author(s): Erix A. Milán‐Garcés, Stéfanos Leite Georgopoulos, Antonio Carlos Sant'Ana, Gustavo F.S. Andrade, Luiz Fernando Cappa Oliveira

Journal: Journal of Raman Spectroscopy

Abstract The vibrational properties of croconic acid (CA), the associated anionic specie croconate (CR), and their complexes with the transition metals Co(II) were investigated through surface‐enhanced Raman scattering (SERS) spectroscopy. This is the first time the SERS spectra of CA and CR are reported. The normal Raman spectrum of CA after the addition of Co(II) was similar to the corresponding spectrum of CR in the presence of...

Read More thumbnail image: Chemical behavior of croconic acid coordinated to CoII adsorbed on silver surface

Comparison of the chromatographic fingerprint, multicomponent quantitation and antioxidant activity of Salvia miltiorrhiza Bge. between sweating and nonsweating

Published: Mar 23, 2018

Author(s): Guozhuan Li, Fan Yu, Yanyan Wang, Liang Yao, Zhen Qiu, Ting Wang, Zhiqiang Wang, Fanglin Yang, Daiyin Peng, Nianjun Yu, Weidong Chen

Journal: Biomedical Chromatography

Abstract Salvia miltiorrhiza Bge. is a traditional Chinese medicine applied in the treatment of various diseases in clinical practice. In the course of its processing, S. miltiorrhiza Bge. is usually processed by sweating. This study employed 10‐component contents determination coupled with high‐performance liquid chromatography (HPLC) fingerprint and antioxidant activity to investigate the effect of sweating on S. miltiorrhiza Bge. so as to...

Read More thumbnail image: Comparison of the chromatographic fingerprint multicomponent quantitation and antioxidant activity of Salvia miltiorrhiza Bge_ between sweating and nonsweating

Simultaneous measurement of NAD metabolome in aged mice tissue using liquid chromatography tandem‐mass spectrometry

Published: Mar 23, 2018

Author(s): Keisuke Yaku, Keisuke Okabe, Takashi Nakagawa

Journal: Biomedical Chromatography

Abstract Nicotinamide adenine dinucleotide (NAD) is a major co‐factor that mediates multiple biological processes including redox reaction and gene expression. Recently, NAD metabolism has received considerable attention because administration of NAD precursors exhibited beneficial effects against aging‐related metabolic disorders in animals. Although numerous studies have reported that NAD levels decline with aging in multiple...

Read More thumbnail image: Simultaneous measurement of NAD metabolome in aged mice tissue using liquid chromatography tandemmass spectrometry

A quantitative LC/MSMS method for determination of edoxaban, a Xa inhibitor and its pharmacokinetic application in patients after total knee arthroplasty

Published: Mar 23, 2018

Author(s): Kazuhiko Hanada, Shin‐ichi Matsumoto, Soichi Shibata, Hajime Matsubara, Yasunori Tsukimura, Harumi Takahashi

Journal: Biomedical Chromatography

Abstract Edoxaban was extracted from human plasma by simple protein precipitation with acetonitrile, followed by quantitative determination using a liquid chromatography–mass spectrometry method. The recoveries of edoxaban and the internal standard (ticlopidine) from human plasma were >85%, and the within‐ and between‐day coefficients of variation were within 15%. The limit of quantification in human plasma was 1 ng/mL. The...

Read More thumbnail image: A quantitative LCMSMS method for determination of edoxaban a Xa inhibitor and its pharmacokinetic application in patients after total knee arthroplasty

β‐Cyclodextrin‐modified three‐dimensional graphene oxide‐wrapped melamine foam for the solid‐phase extraction of flavonoids

Published: Mar 23, 2018

Author(s): Xiudan Hou, Xiaofeng Lu, Panhong Niu, Sheng Tang, Licheng Wang, Yong Guo

Journal: Journal of Separation Science

Abstract A new three‐dimensional graphene oxide‐wrapped melamine foam was prepared and used as a solid‐phase extraction substrate. β‐Cyclodextrin was fabricated onto the surface of three‐dimensional graphene oxide‐wrapped melamine foam by a chemical covalent interaction. In view of a specific surface area and a large delocalized π electron system of graphene oxide, in combination with a hydrophobic interior cavity and a hydrophilic...

Read More thumbnail image: Cyclodextrinmodified threedimensional graphene oxidewrapped melamine foam for the solidphase extraction of flavonoids

Reduction of graphene oxide by UHV annealing

Published: Mar 23, 2018

Author(s): S. Kaciulis, A. Mezzi, P. Soltani, T. Caro, H. Xia, Y.L. Wang, T. Zhai, M. Lavorgna

Journal: Surface and Interface Analysis

A series of chemically treated graphene oxide (GO) samples, destined for the preparation of several composite materials, was studied by X‐ray photoelectron spectroscopy (XPS). From their comparison, the 3‐mercaptopropyl trimethoxysilane was identified as the most effective reducing agent among the used procedures. The influence of ultrahigh vacuum annealing up to 600°C on the chemical composition and carbon electronic configuration in...

Read More thumbnail image: Reduction of graphene oxide by UHV annealing

Surface analysis: From single crystals to biomaterials

Published: Mar 23, 2018

Author(s): David G. Castner

Journal: Surface and Interface Analysis

Surfaces and interfaces play a critical role in material performance in many applications including catalysis, biomaterials, microelectronics, tribology, and adhesion. Characterizing the important surfaces and interfaces involved in each application may present different challenges, but the approach to investigating them often is rather similar. Specialized instrumentation is typically used to probe the surface region of a material, and...

Read More thumbnail image: Surface analysis From single crystals to biomaterials

Oxidative treatment effect on TiH 2 powders

Published: Mar 23, 2018

Author(s): S. Kaciulis, P. Soltani, A. Mezzi, R. Montanari, G. Lapi, M. Richetta, A. Varone, G. Barbieri

Journal: Surface and Interface Analysis

Titanium hydride (TiH2) is a brittle powder, which is highly reactive when exposed to heat or strong oxidizers. Namely due to its high reactivity, TiH2 powder is widely applied in pyrotechnics, initiator squibs, and igniters. All the industrial applications of TiH2 are based on its decomposition and consequent hydrogen release. The surface of TiH2 powders has been analysed after different heat treatments in air realized by...

Read More thumbnail image: Oxidative treatment effect on TiH 2 powders

XPS study of structural transformations in some Ni complexes

Published: Mar 23, 2018

Author(s): A. Naumkin, T. Ivanova, A. Sidorov, K. Maslakov, M. Kiskin, S. Savilov, V. Lunin, V. Novotortsev, I. Eremenko

Journal: Surface and Interface Analysis

X‐ray photoelectron spectroscopy investigations of Ni(LCH3)3(Piv)2 (1), [Ni(LCH3)2]2(Piv)2) (2), and [Ni(LCH3)2]2(CH3COO)2] (3) complexes, where LCH3—k2‐1,2‐diamino‐4,5‐dimethylbenzene‐bis(k1‐diamino‐4,5‐dimethylbenzene) and Piv—(CH3)3CCOO, are reported and discussed. The photoelectron spectra are sensitive to the temperature of the samples and evidence on structural conformations.

Read More thumbnail image: XPS study of structural transformations in some Ni complexes
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