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Impact of contrast agent injection duration on dynamic contrast‐enhanced MRI quantification in prostate cancer

Published: Jul 5, 2018

Author(s): Edzo M.E. Klawer, Petra J. Houdt, Floris J. Pos, Stijn W.T.P.J. Heijmink, Matthias J.P. Osch, Uulke A. Heide

Journal: NMR in Biomedicine

The volume transfer constant Ktrans, which describes the leakage of contrast agent (CA) from vasculature into tissue, is the most commonly reported quantitative parameter for dynamic contrast‐enhanced (DCE‐) MRI. However, the variation in reported Ktrans values between studies from different institutes is large. One of the primary sources of uncertainty is quantification of the arterial input function (AIF). The aim of this study is to determine the...

Read More thumbnail image: Impact of contrast agent injection duration on dynamic contrastenhanced MRI quantification in prostate cancer

Decoupling of a double‐row 16‐element tight‐fit transceiver phased array for human whole‐brain imaging at 9.4 T

Published: Jul 5, 2018

Author(s): Nikolai I. Avdievich, Ioannis A. Giapitzakis, Andreas Pfrommer, Gunamony Shajan, Klaus Scheffler, Anke Henning

Journal: NMR in Biomedicine

One of the major challenges in constructing multi‐channel and multi‐row transmit (Tx) or transceiver (TxRx) arrays is the decoupling of the array's loop elements. Overlapping of the surface loops allows the decoupling of adjacent elements and also helps to improve the radiofrequency field profile by increasing the penetration depth and eliminating voids between the loops. This also simplifies the design by reducing the number of...

Read More thumbnail image: Decoupling of a doublerow 16element tightfit transceiver phased array for human wholebrain imaging at 9_4 T

Ammonia‐weighted imaging by chemical exchange saturation transfer MRI at 3 T

Published: Jul 5, 2018

Author(s): Helge Jörn Zöllner, Markus Butz, Gerald Kircheis, Stefan Klinker, Dieter Häussinger, Benjamin Schmitt, Alfons Schnitzler, Hans‐Jörg Wittsack

Journal: NMR in Biomedicine

Hepatic encephalopathy (HE) is triggered by liver cirrhosis and is associated with an increased ammonia level within the brain tissue. The goal of this study was to investigate effects of ammonia on in vitro amide proton transfer (APT)‐weighted chemical exchange saturation transfer (CEST) imaging in order to develop an ammonia‐sensitive brain imaging method. APT‐weighted CEST imaging was performed on phantom solutions...

Read More thumbnail image: Ammoniaweighted imaging by chemical exchange saturation transfer MRI at 3T

Repair of defects created by Ar + sputtering on graphite surface by annealing as confirmed using ToF‐SIMS and XPS

Published: Jul 5, 2018

Author(s): Wenjing Xie, Lu‐Tao Weng, King Lun Yeung, Chi‐Ming Chan

Journal: Surface and Interface Analysis

Defects were created on the surface of highly oriented pyrolytic graphite (HOPG) by sputtering with an Ar+ ion beam, then characterized using X‐ray photoelectron spectroscopy (XPS) and time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) at 500°C. In the XPS C1s spectrum of the sputtered HOPG, a sp3 carbon peak appeared at 285.3 eV, representing surface defects. In addition, 2 sets of peaks, the Cx− and CxH− ion series (where x = 1, 2, 3...),...

Read More thumbnail image: Repair of defects created by Ar  sputtering on graphite surface by annealing as confirmed using ToFSIMS and XPS

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

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

Identification of volatile markers for the detection of adulterants in red ginseng ( Panax ginseng ) juice using headspace stir‐bar sorptive extraction coupled with gas chromatography and mass spectrometry

Published: Jul 4, 2018

Author(s): Jangho Lee, Takayuki Shibamoto, Jaeho Ha, Hae Won Jang

Journal: Journal of Separation Science

Abstract Red ginseng (Panax ginseng) products are frequently adulterated by manufacturers with cheaper medicinal plant products including deodeok (Codonopsis lanceolata) and doraji (Platycodon grandiflorum) to increase profits. To identify possible volatile markers for the adulteration of red ginseng juices with deodeok or doraji, a headspace stir‐bar sorptive extraction method was developed. Gas chromatography with mass spectrometry and untargeted ...

Read More thumbnail image: Identification of volatile markers for the detection of adulterants in red ginseng  Panax ginseng  juice using headspace stirbar sorptive extraction coupled with gas chromatography and mass spectrometry

Open‐tubular capillary electrochromatographic determination of ten sulfonamides in tap water and milk by a metal‐organic framework‐coated capillary column

Published: Jul 4, 2018

Author(s): Xuan Wang, Nengsheng Ye, Xiaoyu Hu, Qingye Liu, Jian Li, Lin Peng, Xiaotong Ma

Journal: ELECTROPHORESIS

Abstract In this study, a metal‐organic framework (MOF), [Mn(cam)(bpy)], was synthesized and characterized by thermogravimetric analysis, scanning electron microscopy, and Fourier transform infrared spectrometry. An open‐tubular capillary column was fabricated from [Mn(cam)(bpy)] via the amide coupling method. Ten types of sulfonamides were separated through the fabricated capillary column, which showed a good limits of detection (...

Read More thumbnail image: Opentubular capillary electrochromatographic determination of ten sulfonamides in tap water and milk by a metalorganic frameworkcoated capillary column

Carbon molecular sieve based micro‐matrix‐solid‐phase dispersion for the extraction of polyphenols in pomegranate peel by UHPLC‐Q‐TOF/MS

Published: Jul 4, 2018

Author(s): Li‐Jing Du, Jian‐Ping Huang, Bin Wang, Chen‐Hui Wang, Qiu‐Yan Wang, Yu‐Han Hu, Ling Yi, Jun Cao, Li‐Qing Peng, Yu‐Bo Chen, Qi‐Dong Zhang

Journal: ELECTROPHORESIS

Abstract A rapid, simple, and efficient sample extraction method based on micro‐matrix‐solid‐phase dispersion (micro‐MSPD) was applied to the extraction of polyphenols from pomegranate peel. Five target analytes were determined by ultra‐HPLC coupled with Q‐TOF/MS. Carbon molecular sieve (CMS) was firstly used as dispersant to improve extraction efficiency in micro‐MSPD. The major micro‐MSPD parameters, such as type of dispersant,...

Read More thumbnail image: Carbon molecular sieve based micromatrixsolidphase dispersion for the extraction of polyphenols in pomegranate peel by UHPLCQTOFMS

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

Preparation and evaluation of temperature and magnetic dual‐responsive molecularly imprinted polymers for the specific enrichment of formononetin

Published: Jul 4, 2018

Author(s): Yu‐Zhen Zhang, Jiawei Zhang, Ling Tan, Zhining Xia, Chong‐Zhi Wang, Lian‐Di Zhou, Qihui Zhang, Chun‐Su Yuan

Journal: Journal of Separation Science

Abstract Thermo‐responsive magnetic molecularly imprinted polymers were prepared by simple surface molecular imprinting polymerization for the selective adsorption and enrichment of formononetin from Trifolium pretense by temperature regulation. Using formononetin as a template, N‐isopropylacrylamide as the thermo‐responsive functional monomer, and methacrylic acid as an assisting functional monomer, the polymers were synthesized on the surface...

Read More thumbnail image: Preparation and evaluation of temperature and magnetic dualresponsive molecularly imprinted polymers for the specific enrichment of formononetin

Solid‐phase extraction using octadecyl‐bonded silica modified with photosynthetic pigments from Spinacia oleracea L. for the preconcentration of lead(II) ions from aqueous samples

Published: Jul 4, 2018

Author(s): Eliza Blicharska, Małgorzata Tatarczak‐Michalewska, Anita Plazińska, Wojciech Plaziński, Anna Kowalska, Anna Madejska, Monika Szymańska‐Chargot, Anna Sroka‐Bartnicka, Jolanta Flieger

Journal: Journal of Separation Science

Abstract Spinacia oleracea L. extract was immobilized on an octadecyl‐bonded silica surface to produce a new sorbent for the solid‐phase extraction of trace amounts of metal ions from aqueous neutral samples. A measurement of the metal content has been performed by using graphite furnace atomic absorption spectroscopy. The affinity of the investigated bivalent metal cations for the modified sorbent are in the order:...

Read More thumbnail image: Solidphase extraction using octadecylbonded silica modified with photosynthetic pigments from Spinacia oleracea L_ for the preconcentration of leadII ions from aqueous samples

Preparation and application of magnetic molecularly imprinted polymers for the isolation of chelerythrine from Macleaya cordata

Published: Jul 4, 2018

Author(s): Ming Zhong, Yan‐Hong Wang, Lu Wang, Rui‐Qing Long, Chun‐Lin Chen

Journal: Journal of Separation Science

Abstract A novel type of magnetic molecularly imprinted polymer was prepared for the selective enrichment and isolation of chelerythrine from Macleaya cordata (Willd) R. Br. The magnetic molecularly imprinted polymers were prepared using functional Fe3O4@SiO2 as a magnetic support, chelerythrine as template, methacrylic acid as functional monomer, and ethylene glycol dimethacrylate as cross‐linker. Density functional theory at the B3LYP/6‐31G...

Read More thumbnail image: Preparation and application of magnetic molecularly imprinted polymers for the isolation of chelerythrine from Macleaya cordata

Importance of sample preparation on reliable surface characterisation of nano‐objects: ISO standard 20579‐4

Published: Jul 4, 2018

Author(s): Donald R. Baer, Ajay S. Karakoti, Charles A. Clifford, Caterina Minelli, Wolfgang E. S. Unger

Journal: Surface and Interface Analysis

The international ISO Standard 20579‐4, dealing with the history and preparation of nano‐objects for surface analysis, has been developed to help address some of the replication and reproducibility issues caused by the fundamental nature of nano‐objects. Although all types of samples requiring surface analysis need thoughtful preparation, nano‐objects, for which many properties are controlled by their surfaces, present additional...

Read More thumbnail image: Importance of sample preparation on reliable surface characterisation of nanoobjects ISO standard 205794

Thickness and temperature‐dependent study of Co/Si interface

Published: Jul 4, 2018

Author(s): Anil Kumar, Ranjeet Brajpuriya, Priti Singh

Journal: Surface and Interface Analysis

Thin films of cobalt (10, 40, and 100 nm) are deposited on Si substrate by electron beam physical vapor deposition technique. After deposition, 4 pieces from each of the wafers of silicon substrate were cut and annealed at a temperature of 200°C, 300°C, and 400°C for 2 hours each, separately. X‐ray diffraction, atomic force microscopy, and transmission electron microscopy (TEM) are used to study the structural and morphological...

Read More thumbnail image: Thickness and temperaturedependent study of CoSi interface

Simultaneous determination of 22 phthalate esters in polystyrene food‐contact materials by ultra‐performance convergence chromatography with tandem mass spectrometry

Published: Jul 3, 2018

Author(s): Ying‐Li Fan, Ming Ma, He‐Zhen Cui, Shu Liu, Min‐Li Yang, Xiu‐Feng Hou

Journal: Journal of Separation Science

Abstract A method for the determination of 22 phthalate esters in polystyrene food‐contact materials has been established using ultraperformance convergence chromatography with tandem mass spectrometry. In this method, 22 phthalate esters were analyzed in <3.5 min on an ACQUITY Tours 1‐AA column by gradient elution. The mobile phase, the compensation solvent, the flow rate of mobile phase, column temperature, and...

Read More thumbnail image: Simultaneous determination of 22 phthalate esters in polystyrene foodcontact materials by ultraperformance convergence chromatography with tandem mass spectrometry

Preparation and application of chlorpyrifos molecularly imprinted solid‐phase microextraction probes for the residual determination of organophosphorous pesticides in fresh and dry foods

Published: Jul 3, 2018

Author(s): Jin‐Kui Ma, Xiao‐Chen Huang, Shou‐Lian Wei

Journal: Journal of Separation Science

Abstract A solid‐phase microextraction probe was prepared on the surface of a stainless‐steel wire through molecular sol–gel imprinting technology using chlorpyrifos as a template molecule, tetraethoxysilane as a sol–gel precursor, and acrylamide and β‐cyclodextrin as functional monomers. The polymer was characterized by infrared spectrometry and scanning electron microscopy. Moreover, the selectivity and the parameters including...

Read More thumbnail image: Preparation and application of chlorpyrifos molecularly imprinted solidphase microextraction probes for the residual determination of organophosphorous pesticides in fresh and dry foods

Preparation and purification of canthinone and β‐carboline alkaloids from Picrasma quassioides based on bioautography and mass‐spectrometry‐directed autopurification system

Published: Jul 3, 2018

Author(s): Na Yang, Yanhong Shi, Aizhen Xiong, Yue Zhou, Lihua Gu, Rui Wang, Li Yang, Zhengtao Wang

Journal: Journal of Separation Science

Abstract Picrasma quassioides (D. Don) Benn. is a widely used traditional Chinese medicine for anti‐inflammation and antibiosis. Canthinone and β‐carboline alkaloids are the main characteristic constituents that possess diverse pharmacological effects, such as anti‐inflammatory and anti‐infectious properties. In this study, bioautography in thin‐layer chromatography indicated that the antiradical activity compound may be alkaloids....

Read More thumbnail image: Preparation and purification of canthinone and carboline alkaloids from Picrasma quassioides based on bioautography and massspectrometrydirected autopurification system
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