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Is there evidence for more than two diffusion components in abdominal organs? – A magnetic resonance imaging study in healthy volunteers

Published: Nov 3, 2017

Author(s): Moritz C. Wurnig, Manon Germann, Andreas Boss

Journal: NMR in Biomedicine

The most commonly applied model for the description of diffusion‐weighted imaging (DWI) data in perfused organs is bicompartmental intravoxel incoherent motion (IVIM) analysis. In this study, we assessed the ground truth of underlying diffusion components in healthy abdominal organs using an extensive DWI protocol and subsequent computation of apparent diffusion coefficient ‘spectra’, similar to the computation of previously described T2...

Read More thumbnail image: Is there evidence for more than two diffusion components in abdominal organs  A magnetic resonance imaging study in healthy volunteers

Differentiating the histologic grades of gliomas preoperatively using amide proton transfer‐weighted (APTW) and intravoxel incoherent motion MRI

Published: Nov 3, 2017

Author(s): Tianyu Zou, Hao Yu, Chunxiu Jiang, Xianlong Wang, Shanshan Jiang, Qihong Rui, Yingjie Mei, Jinyuan Zhou, Zhibo Wen

Journal: NMR in Biomedicine

The purpose of this work was to investigate the diagnostic performance of amide proton transfer‐weighted (APTW) and intravoxel incoherent motion (IVIM) magnetic resonance imaging (MRI) in the preoperative grading of gliomas. Fifty‐one patients with suspected gliomas were recruited and underwent a preoperative MRI examination that included APTW and IVIM sequences. All cases were confirmed by postsurgical histopathology. APTW signal...

Read More thumbnail image: Differentiating the histologic grades of gliomas preoperatively using amide proton transferweighted APTW and intravoxel incoherent motion MRI

Toxicokinetics of strychnine and brucine after the oral administration of Biqi capsule to rats by RRLC–MS/MS

Published: Nov 3, 2017

Author(s): Hao Zheng, Zhe Wang, Wenwei Liu, Hongtao Jin, Jinlan Zhang

Journal: Biomedical Chromatography

Abstract Biqi capsule is a well‐known traditional Chinese medicine formula that has been widely applied for the clinical treatment of such diseases as rheumatoid arthritis, scapulohumeral periarthritis and cervical spondylopathy. However, there is concern regarding the toxicity of Biqi capsule owing to its active ingredients, strychnine and brucine. To investigate the toxicokinetics of strychnine and brucine after oral...

Read More thumbnail image: Toxicokinetics of strychnine and brucine after the oral administration of Biqi capsule to rats by RRLCMSMS

Quantification and application of a liquid chromatography–tandem mass spectrometric method for the determination of WKYMVm peptide in rat using solid‐phase extraction

Published: Nov 3, 2017

Author(s): Byeong ill Lee, Min‐Ho Park, Soon Chul Heo, Yuri Park, Seok‐Ho Shin, Jin‐Ju Byeon, Jae Ho Kim, Young G. Shin

Journal: Biomedical Chromatography

Abstract A liquid chromatographic–electrospray ionization–time‐of‐flight/mass spectrometric (LC‐ESI‐TOF/MS) method was developed and applied for the determination of WKYMVm peptide in rat plasma to support preclinical pharmacokinetics studies. The method consisted of micro‐elution solid‐phase extraction (SPE) for sample preparation and LC‐ESI‐TOF/MS in the positive ion mode for analysis. Phenanthroline (10 mg/mL) was added to rat...

Read More thumbnail image: Quantification and application of a liquid chromatographytandem mass spectrometric method for the determination of WKYMVm peptide in rat using solidphase extraction

Prototype GaAs X‐ray detector and preamplifier electronics for a deep seabed mineral XRF spectrometer

Published: Nov 2, 2017

Author(s): G. Lioliou, A.M. Barnett

Journal: X-Ray Spectrometry

Work towards developing a prototype GaAs based X‐ray fluorescence spectrometer focusing on the detector‐preamplifier system for in situ characterisation of deep seabed minerals is presented. Such an instrument could be useful for marine geology and provide insight into hydrothermal processes. It would also be beneficial for deep sea mining applications. The GaAs photodiode was electrically characterised at 4 °C (ambient seawater...

Read More thumbnail image: Prototype GaAs Xray detector and preamplifier electronics for a deep seabed mineral XRF spectrometer

Critical comparison of the on‐line and off‐line molecularly imprinted solid‐phase extraction of patulin coupled with liquid chromatography

Published: Nov 2, 2017

Author(s): Ivona Lhotská, Anežka Holznerová, Petr Solich, Dalibor Šatínský

Journal: Journal of Separation Science

Abstract Reaching trace amounts of mycotoxin contamination requires sensitive and selective analytical tools for their determination. Improving the selectivity of sample pretreatment steps covering new and modern extraction techniques is one way to achieve it. Molecularly imprinted polymers as selective sorbent for extraction undoubtedly meet these criteria. The presented work is focused on the hyphenation of on‐line molecularly...

Read More thumbnail image: Critical comparison of the online and offline molecularly imprinted solidphase extraction of patulin coupled with liquid chromatography

Advances in native high‐performance liquid chromatography and intact mass spectrometry for the characterization of biopharmaceutical products

Published: Nov 2, 2017

Author(s): Marco Tassi, Jelle Vos, Sneha Chatterjee, Frank Sobott, Jonathan Bones, Sebastiaan Eeltink

Journal: Journal of Separation Science

Abstract The characterization of biotherapeutics represents a major analytical challenge. This review discusses the current state‐of‐the‐art in analytical technologies to profile biopharma products under native conditions, i.e., the protein three dimensional conformation is maintained during liquid chromatographic analysis. Native liquid‐chromatographic modes that are discussed include aqueous size‐exclusion chromatography,...

Read More thumbnail image: Advances in native highperformance liquid chromatography and intact mass spectrometry for the characterization of biopharmaceutical products

Photoirradiation surface molecularly imprinted polymers for the separation of 6‐ O ‐α‐ d ‐maltosyl‐β‐cyclodextrin

Published: Nov 2, 2017

Author(s): Haoran Fan, Jinpeng Wang, Qingran Meng, Yaoqi Tian, Xueming Xu, Zhengyu Jin

Journal: Journal of Separation Science

Abstract Photoirradiation surface molecularly imprinted polymers for the separation of 6‐O‐α‐d‐maltosyl‐β‐cyclodextrin were synthesized using functionalized silica as a matrix, 4‐(phenyldiazenyl)phenol as a light‐sensitive monomer, and 6‐O‐α‐d‐maltosyl‐β‐cyclodextrin as a template. Fourier transform infrared spectroscopy results indicated that 4‐(phenyldiazenyl)phenol was grafted onto the surface of functionalized silica. The obtained imprinted...

Read More thumbnail image: Photoirradiation surface molecularly imprinted polymers for the separation of 6 O  d maltosylcyclodextrin

Recent advances in methods for the analysis of protein o‐glycosylation at proteome level

Published: Nov 2, 2017

Author(s): Xin You, Hongqiang Qin, Mingliang Ye

Journal: Journal of Separation Science

Abstract O‐Glycosylation, which refers to the glycosylation of the hydroxyl group of side chains of Serine/Threonine/Tyrosine residues, is one of the most common post‐translational modifications. Compared with N‐linked glycosylation, O‐glycosylation is less explored because of its complex structure and relatively low abundance. Recently, O‐glycosylation has drawn more and more attention for its various functions in many...

Read More thumbnail image: Recent advances in methods for the analysis of protein oglycosylation at proteome level

Molecular Dissection of Extracellular Matrix Proteome Reveals Discrete Mechanism Regulating Verticillium Dahliae Triggered Vascular Wilt Disease in Potato

Published: Nov 2, 2017

Author(s): Eman Elagamey, Arunima Sinha, Kanika Narula, Magdi A.E. Abdellatef, Niranjan Chakraborty, Subhra Chakraborty

Journal: PROTEOMICS

Abstract Plants exposed to patho‐stress mostly succumb due to disease by disruption of cellular integrity and changes in the composition of the extracellular matrix (ECM). Vascular wilt, caused by the soil borne hemibiotrophic filamentous fungus Verticillium dahliae, is one of the most significant diseases that adversely affect plant growth and productivity. The virulence of the pathogen associated with the ECM‐related susceptibility of the...

Read More thumbnail image: Molecular Dissection of Extracellular Matrix Proteome Reveals Discrete Mechanism Regulating Verticillium Dahliae Triggered Vascular Wilt Disease in Potato

XRF characterization and source apportionment of PM10 samples collected in a coastal city

Published: Nov 1, 2017

Author(s): M. Manousakas, E. Diapouli, H. Papaefthymiou, V. Kantarelou, C. Zarkadas, A.‐C. Kalogridis, A.‐G. Karydas, K. Eleftheriadis

Journal: X-Ray Spectrometry

In the current study, a yearlong measurement campaign was conducted during the year 2012 in a medium sized coastal Greek city, Patras. PM10 samples were collected once every 3 days, and a number of those samples were analyzed by the use of a commercial X‐ray fluorescence system, Epsilon 5 by PANalytical, The Netherlands. PMF model was used for source identification. Because the uncertainty of the measurements is used as input in the...

Read More thumbnail image: XRF characterization and source apportionment of PM10 samples collected in a coastal city

A review of the nuclear magnetic resonance physics and application in petroleum industry

Published: Nov 1, 2017

Author(s): Ayham Ashqar

Journal: Concepts in Magnetic Resonance Part A

Abstract The measurement of the nuclei response to an external magnetic field known as nuclear magnetic resonance (NMR) has proven to have wide application covering different industries. NMR use in the petroleum industry focuses on solving rock and fluid properties. NMR T2 is the dominant measurement due to the short measurement time in comparison with T1, and at the same time, it generates the required information. The nondestructive technique...

Read More thumbnail image: A review of the nuclear magnetic resonance physics and application in petroleum industry

Examining the importance of the level of computational theory used in solution‐phase structural determinations by NMR using residual dipolar couplings

Published: Nov 1, 2017

Author(s): Diana Tabada, Faranak Mahmoudi, William R. Carroll

Journal: Concepts in Magnetic Resonance Part A

Abstract The structures of many small molecules have been determined using residual dipolar couplings (RDCs) and the singular value decomposition method (SVD). Here, a key part of the SVD method is examined. The methods used to predict the 3‐dimensional structures of molecules used in the SVD methodology for comparison with RDCs were examined for their impact on the quality of agreement that those structures had with observed RDCs....

Read More thumbnail image: Examining the importance of the level of computational theory used in solutionphase structural determinations by NMR using residual dipolar couplings

Models of diffusion signal decay in magnetic resonance imaging: Capturing complexity

Published: Oct 31, 2017

Author(s): Richard L. Magin

Journal: Concepts in Magnetic Resonance Part A

Abstract Diffusion‐weighted MRI is a key diagnostic component of clinical medicine. Radiologists use models of the effects of diffusion weighting to connect the decay of the signal intensity in tissues with macroscopic (diffusion tensor imaging) and microscopic (q‐space imaging) structures. This multi‐scale problem has stimulated the creation of many diffusion models spanning phenomenon in cells, in tissues, and in organs. Such...

Read More thumbnail image: Models of diffusion signal decay in magnetic resonance imaging Capturing complexity

Analysis of antibiotics by CE and CEC and their use as chiral selectors: An update

Published: Oct 31, 2017

Author(s): Maider Greño, María Castro‐Puyana, María Ángeles García, María Luisa Marina

Journal: ELECTROPHORESIS

Abstract Natural, synthetic or semisynthetic antibiotics are highly used to prevent or treat diseases in humans and animals, and to promote animal growth. This fact makes that antibiotics residues or their transformation products may be present in food or in the environment after human or animal excretion. For this reason, it is imperative to develop reliable and sensitive analytical methodologies for their analysis. The main aim of...

Read More thumbnail image: Analysis of antibiotics by CE and CEC and their use as chiral selectors An update

Recent advances in the application of capillary electromigration methods for food analysis and Foodomics

Published: Oct 31, 2017

Author(s): Gerardo Álvarez, Lidia Montero, Laura Llorens, María Castro‐Puyana, Alejandro Cifuentes

Journal: ELECTROPHORESIS

Abstract This review work presents and discusses the main applications of capillary electromigration methods in food analysis and Foodomics. Papers that were published during the period February 2015‐February 2017 are included following the previous review by Acunha et al. (Electrophoresis 2016, 37, 111–141). The paper shows the large variety of food related molecules that have been analyzed by CE including amino acids,...

Read More thumbnail image: Recent advances in the application of capillary electromigration methods for food analysis and Foodomics

Nonaqueous capillary electrophoresis mass spectrometry method for determining highly hydrophobic peptides

Published: Oct 31, 2017

Author(s): Jianhui Cheng, David D. Y. Chen

Journal: ELECTROPHORESIS

Abstract A nonaqueous capillary electrophoresis mass spectrometry (NACE‐MS) method was developed to separate and determine highly hydrophobic temporin peptides. The nonaqueous background electrolyte solution was a mixture of 20% acetonitrile, 78% methanol and 2% formic acid, with 20 mM ammonium formate. The separation of six peptides was completed within 12 min. The CE system was connected to a triple quadrupole mass spectrometer...

Read More thumbnail image: Nonaqueous capillary electrophoresis mass spectrometry method for determining highly hydrophobic peptides

Ion traps in modern mass spectrometry

Published: Oct 30, 2017

Author(s): Dirk Nolting, Robert Malek, Alexander Makarov

Journal: Mass Spectrometry Reviews

This review is devoted to trapping mass spectrometry wherein ions are confined by electromagnetic fields for prolonged periods of time within limited volume, with mass measurement taking place within the same volume. Three major types of trapping mass spectrometers are discussed, specifically radiofrequency ion trap, Fourier transform ion cyclotron resonance and Orbitrap. While these three branches are intricately...

Read More thumbnail image: Ion traps in modern mass spectrometry

Analysis of six active components in Radix tinosporae by nonaqueous capillary electrophoresis with mass spectrometry

Published: Oct 30, 2017

Author(s): Yikun Liu, Wei Zhou, Zhenkun Mao, Xiaoyan Liao, Zilin Chen

Journal: Journal of Separation Science

Abstract Nonaqueous capillary electrophoresis with mass spectrometry has advantages for the analysis of active components in herbs. Here, a rapid nonaqueous capillary electrophoresis with mass spectrometry method was developed to separate, identify, and quantify palmatin, columbin, cepharanthine, menisperine, magnoflorine, and 20‐hydroxyecdysone in Radix tinosporae. Electrospray ionization MS1‐3 spectra of the six components were collected and...

Read More thumbnail image: Analysis of six active components in Radix tinosporae by nonaqueous capillary electrophoresis with mass spectrometry

Dispersive admicelle solid‐phase extraction based on sodium dodecyl sulfate coated Fe 3 O 4 nanoparticles for the selective adsorption of three alkaloids in Gegen‐Qinlian oral liquid before high‐performance liquid chromatography

Published: Oct 30, 2017

Author(s): Zhihong Shi, Dan Xu, Xuan Zhao, Xinghong Li, Huimin Shen, Bing Yang, Hongyi Zhang

Journal: Journal of Separation Science

Abstract A novel dispersive admicelle solid‐phase extraction method based on sodium dodecyl sulfate‐coated Fe3O4 nanoparticles was developed for the selective adsorption of berberine, coptisine, and palmatine in Gegen‐Qinlian oral liquid before high‐performance liquid chromatography. Fe3O4 nanoparticles were synthesized by a chemical coprecipitation method and characterized by using transmission electron microscopy. Under acidic conditions, the...

Read More thumbnail image: Dispersive admicelle solidphase extraction based on sodium dodecyl sulfate coated Fe 3 O 4 nanoparticles for the selective adsorption of three alkaloids in GegenQinlian oral liquid before highperformance liquid chromatography
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