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Feasibility of quantitative ultrashort echo time (UTE)‐based methods for MRI of peripheral nerve

Published: Jul 16, 2018

Author(s): Shu‐Juan Fan, Jonathan Wong, Xin Cheng, Ya‐Jun Ma, Eric Y. Chang, Jiang Du, Sameer B. Shah

Journal: NMR in Biomedicine

Peripheral nerves are a composite tissue consisting of neurovascular elements packaged within a well‐organized extracellular matrix. Their composition, size, and anatomy render nerves a challenging medical imaging target. In contrast to morphological MRI, which represents the predominant approach to nerve imaging, quantitative MRI sequences can provide information regarding tissue composition. Here, we applied standard clinical...

Read More thumbnail image: Feasibility of quantitative ultrashort echo time UTEbased methods for MRI of peripheral nerve

Multi‐parametric T 2 * magnetic resonance fingerprinting using variable echo times

Published: Jul 16, 2018

Author(s): Cory R. Wyatt, Travis B. Smith, Manoj K. Sammi, William D. Rooney, Alexander R. Guimaraes

Journal: NMR in Biomedicine

The use of quantitative imaging biomarkers in the imaging of various disease states, including cancer and neurodegenerative disease, has increased in recent years. T1, T2, and T2* relaxation time constants have been shown to be affected by tissue structure or contrast infusion. Acquiring these biomarkers simultaneously in a multi‐parametric acquisition could provide more robust detection of tissue changes in various disease states...

Read More thumbnail image: Multiparametric T 2  magnetic resonance fingerprinting using variable echo times

Ternary deep eutectic solvent magnetic molecularly imprinted polymers for the dispersive magnetic solid‐phase microextraction of green tea

Published: Jul 16, 2018

Author(s): Guizhen Li, Kyung Ho Row

Journal: Journal of Separation Science

Abstract Ternary deep eutectic solvent magnetic molecularly imprinted polymers grafted on silica were developed for the selective recognition and separation of theophylline, theobromine, (+)‐catechin hydrate, and caffeic acid from green tea through dispersive magnetic solid‐phase microextraction. A new ternary deep eutectic solvent was adopted as a functional monomer. The materials obtained were characterized by FTIR spectroscopy, field...

Read More thumbnail image: Ternary deep eutectic solvent magnetic molecularly imprinted polymers for the dispersive magnetic solidphase microextraction of green tea

Wireless amplified NMR detector for improved visibility of image contrast in heterogeneous lesions

Published: Jul 16, 2018

Author(s): Xianchun Zeng, Shengqiang Xu, Changyong Cao, Jian Wang, Chunqi Qian

Journal: NMR in Biomedicine

To demonstrate the capability of a wireless amplified NMR detector (WAND) to improve the visibility of lesion heterogeneity without the use of exogenous contrast agents, a cylindrically symmetric WAND was constructed to sensitively detect and simultaneously amplify MR signals emitted from adjacent tissues. Based on a two‐leg high‐pass birdcage coil design, this WAND could be activated by a pumping field aligned along the main field (B0),...

Read More thumbnail image: Wireless amplified NMR detector for improved visibility of image contrast in heterogeneous lesions

Conservation of energy, density of states, and spin lattice relaxation

Published: Jul 15, 2018

Author(s): Navin Khaneja

Journal: Concepts in Magnetic Resonance Part A

Abstract The starting point of all NMR experiments is a spin polarization which develops when we place the sample in static magnetic field B0. There are excess of spins aligned along B0 (spin up with lower energy) than spins aligned opposite (spin down with higher energy) to the field B0. A natural question is what is the source of this excess spin polarization because relaxation mechanisms can flip a up spin to a down spin and vice‐versa. The...

Read More thumbnail image: Conservation of energy density of states and spin lattice relaxation

Development of oxide nanofiber–tipped cantilever as a substrate for cross‐sectional transmission electron microscopy analysis

Published: Jul 15, 2018

Author(s): Kouki Watanabe, Subash Sharma, Mona Ibrahim Araby, Masahide Shima, Takumi Harada, Mohamad Saufi Rosmi, Golap Kalita, Masashi Kitazawa, Masaki Tanemura

Journal: Surface and Interface Analysis

A development of the technique that enables the simple, rapid, and damage‐free sample preparation for cross‐sectional transmission electron microscopy (X‐TEM) analyses is quite important. Here, we propose a silicon (Si) oxide nanofiber (SON) formed on a tip of an atomic force microscope cantilever as a substrate onto which materials in question are deposited for X‐TEM analyses. Based on the technique for the ion‐irradiation–induced carbon...

Read More thumbnail image: Development of oxide nanofibertipped cantilever as a substrate for crosssectional transmission electron microscopy analysis

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

Evaluation of the synergistic effect with amino acids for enantioseparation of basic drugs using capillary electrophoresis

Published: Jul 13, 2018

Author(s): Soheila Chalavi, Ali Reza Fakhari, Saeed Nojavan, Peyman Mirzaei

Journal: ELECTROPHORESIS

Abstract The synergistic effect of two acidic amino acids, aspartic and glutamic acid, on the electrophoretic enantioseparation of four basic drugs was evaluated in the BGE containing a CD and at different pHs. Chlorpheniramine, hydroxyzine, propranolol and tramadol were used as the basic model drugs. However, no enantioseparations were achieved with a BGE containing sole amino acid, but the combined use of an acidic amino acid and...

Read More thumbnail image: Evaluation of the synergistic effect with amino acids for enantioseparation of basic drugs using capillary electrophoresis

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

Changes in intestinal microbiota affect metabolism of ginsenoside Re

Published: Jul 12, 2018

Author(s): Lei Zhang, Fei Li, Wang‐Jun Qin, Chao Fu, Xiang‐Lin Zhang

Journal: Biomedical Chromatography

Abstract Ginsenoside Re, an active ingredient in Panax ginseng, is widely used as a therapeutic and nutriment. The intestinal microbiota plays crucial roles in modulating the pharmacokinetics and pharmacological actions of ginsenoside Re. The aim of this study was to explore the relationship between bacterial community variety and the metabolic profiles of ginsenoside Re. We developed two models with intestinal dysbacteriosis: a...

Read More thumbnail image: Changes in intestinal microbiota affect metabolism of ginsenoside Re

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

Development and validation of a high‐throughput assay for the quantification of multiple green tea‐derived catechins in human plasma

Published: Jul 12, 2018

Author(s): Deborah H. Mawson, Keon L. Jeffrey, Philip Teale, Philip B. Grace

Journal: Biomedical Chromatography

Abstract A rapid, accurate and robust method for the determination of catechin (C), epicatechin (EC), gallocatechin (GC), epigallocatechin (EGC), catechin gallate (Cg), epicatechin gallate (ECg), gallocatechin gallate (GCg) and epigallocatechin gallate (EGCg) concentrations in human plasma has been developed. The method utilizes protein precipitation following enzyme hydrolysis, with chromatographic separation and detection using...

Read More thumbnail image: Development and validation of a highthroughput assay for the quantification of multiple green teaderived catechins in human plasma

Determination of inorganic cations in biological fluids using a hybrid capillary electrophoresis device coupled with contactless conductivity detection

Published: Jul 11, 2018

Author(s): Eulício Oliveira Lobo‐Júnior, Cyro L. S. Chagas, Wendell K. T. Coltro

Journal: Journal of Separation Science

Abstract We describe the assembly of a hybrid electrophoresis device that contains fused silica capillaries interconnected to a microfabricated interface in a cross format for the determination of inorganic cations in biological samples. The sample transport in the proposed hybrid device was performed under gated injection mode and the separations were monitored with a capacitively coupled contactless conductivity detector. The...

Read More thumbnail image: Determination of inorganic cations in biological fluids using a hybrid capillary electrophoresis device coupled with contactless conductivity detection

Basalt fibers grafted with a poly(ionic liquids) coating for in‐tube solid‐phase microextraction

Published: Jul 11, 2018

Author(s): Juanjuan Feng, Xiuqin Wang, Yu Tian, Chuannan Luo, Min Sun

Journal: Journal of Separation Science

Abstract To improve the durability and extraction efficiency of an ionic liquid coating, 1‐dodecyl‐3‐vinylimidazolium bromide was polymerized and grafted onto basalt fibers for in‐tube solid‐phase microextraction. To develop an extraction tube, basalt fibers grafted with the poly(ionic liquids) coating were filled into a polyether ether ketone tube with a 0.75 mm inner diameter. The extraction tube was connected to...

Read More thumbnail image: Basalt fibers grafted with a polyionic liquids coating for intube solidphase microextraction

Graphene‐coated magnetic‐sheet solid‐phase extraction followed by high‐performance liquid chromatography with fluorescence detection for the determination of aflatoxins B 1 , B 2 , G 1 , and G 2 in soy‐based samples

Published: Jul 11, 2018

Author(s): Nina Nouri, Hassan Sereshti, Ali Farahani

Journal: Journal of Separation Science

Abstract A new method named graphene‐coated magnetic‐sheet solid‐phase extraction based on a magnetic three‐dimensional graphene sorbent was developed for the extraction of aflatoxins prior to high‐performance liquid chromatography with fluorescence detection. The use of a perforated magnetic‐sheet for fixing the magnetic nanoparticles is a new feature of the method. Hence, the adsorbent particles can be separated from sample...

Read More thumbnail image: Graphenecoated magneticsheet solidphase extraction followed by highperformance liquid chromatography with fluorescence detection for the determination of aflatoxins B 1  B 2  G 1  and G 2 in soybased samples

Molecularly imprinted covalent organic polymers for the selective extraction of benzoxazole fluorescent whitening agents from food samples

Published: Jul 11, 2018

Author(s): Hui Ding, Rongyu Wang, Xiao Wang, Wenhua Ji

Journal: Journal of Separation Science

Abstract Molecularly imprinted covalent organic polymers were constructed by an imine‐linking reaction between 1,3,5‐triformylphloroglucinol and 2,6‐diaminopyridine and used for the selective solid‐phase extraction of benzoxazole fluorescent whitening agents from food samples. Binding experiments showed that imprinting sites on molecularly imprinted polymers had higher selectivity for targets compared with those of the corresponding...

Read More thumbnail image: Molecularly imprinted covalent organic polymers for the selective extraction of benzoxazole fluorescent whitening agents from food samples
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