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Buprofezin dissipation and safety assessment in open field cabbage and cauliflower using GC/ITMS employing an analyte protectant

Published: Feb 18, 2019

Author(s): Osama Abdallah, Moustafa El Agamy, Ehab Abdelraheem, Farag Malhat

Journal: Biomedical Chromatography

Abstract An analytical method for the determination of buprofezin residues in cabbage and cauliflower was developed and validated using gas chromatography with ion trap mass spectrometry. The analyte protectant d‐sorbitol was used at a concentration level of 0.5 mg mL−1 in acetonitrile instead of in matrix for constructing the calibration curves of the buprofezin standard. The average recoveries ranged from 91.3 to 96.8%, with an RSD of ≤2.7%. The limits of detection and quantitation of the...

Read More thumbnail image: Buprofezin dissipation and safety assessment in open field cabbage and cauliflower using GCITMS employing an analyte protectant

Facile synthesis of magnetic zinc metal‐organic framework for extraction of nitrogen‐containing heterocyclic fungicides from lettuce vegetable samples

Published: Feb 18, 2019

Author(s): Guangyang Liu, Xiaodong Huang, Meng Lu, Lingyun Li, Tengfei Li, Donghui Xu

Journal: Journal of Separation Science

Abstract We present a simple method for the fabrication of a magnetic amino‐functionalized zinc metal‐organic framework based on a magnetic graphene oxide composite. The resultant framework exhibited a porous 3D structure, high surface area and good adsorption properties for nitrogen‐containing heterocyclic fungicides. The adsorption process and capacity indicated that the primary adsorption mechanism might be hydrogen bonding and π‐π conjugation. In addition, an optimized protocol for...

Read More thumbnail image: Facile synthesis of magnetic zinc metalorganic framework for extraction of nitrogencontaining heterocyclic fungicides from lettuce vegetable samples

Ultrasensitive separation of methylprednisolone acetate using a photoresponsive molecularly imprinted polymer incorporated polyester dendrimer based on magnetic nanoparticles

Published: Feb 18, 2019

Author(s): Nasim Baimani, Parviz Aberoomand Azar, Syed Waqif Husain, Homayon Ahmad Panahi, Ali Mehramizi

Journal: Journal of Separation Science

Abstract We developed an approach for the use of polyester dendrimer during the imprinting process to raise the number of recognized sites in the polymer matrix and improve its identification ability. Photoresponsive molecularly imprinted polymers were synthesized on modified magnetic nanoparticles involving polyester dendrimer which uses the reactivity between allyl glycidyl ether and acrylic acid for the high‐yielding assembly by surface polymerization. The photoresponsive molecularly...

Read More thumbnail image: Ultrasensitive separation of methylprednisolone acetate using a photoresponsive molecularly imprinted polymer incorporated polyester dendrimer based on magnetic nanoparticles

Can cells maintain their bioactivity in ionic liquids? A novel single‐cell assessment by Raman microspectroscopy

Published: Feb 18, 2019

Author(s): Ami Matsuda, Naoko Sakaguchi, Shinsuke Shigeto

Journal: Journal of Raman Spectroscopy

Abstract Ionic liquids (ILs) are widely exploited in numerous applications in chemistry, biology, and materials science. Assessment of the toxicity of ILs is thus urgently needed to develop genuinely “green” ILs that do not pose hazards to the environment and humans. Despite considerable efforts mostly with cell viability assays, little has been understood about how, at the molecular level, ILs affect the bioactivity and intracellular chemistry of single individual cells. Here, we report a new...

Read More thumbnail image: Can cells maintain their bioactivity in ionic liquids A novel singlecell assessment by Raman microspectroscopy

Molecularly imprinted solid‐phase extraction method for the gas chromatographic analysis of organochlorine fungicides in ginseng

Published: Feb 18, 2019

Author(s): Xuanwei Xu, Shuang Liang

Journal: Journal of Separation Science

Abstract A highly selective molecularly imprinted solid‐phase extraction coupled with gas chromatography method was developed for the simultaneous isolation and determination of four organochlorine fungicides (pentachloronitrobenzene, pentachloroaniline, methylpentachlorophenyl sulfide, and hexachlorobenzene) in ginseng samples. A novel molecularly imprinted polymer with pentachloronitrobenzene as template was synthesized by precipitation polymerization employing butanone/n‐heptane...

Read More thumbnail image: Molecularly imprinted solidphase extraction method for the gas chromatographic analysis of organochlorine fungicides in ginseng

Black ceramic coatings prepared in phosphate‐based electrolyte containing Fe3+ complexes on ZK61M Mg alloy by micro‐arc oxidation

Published: Feb 17, 2019

Author(s): Zekai Song, Xudong Wang, Rongbo Li, Ming Zhang

Journal: Surface and Interface Analysis

Black micro‐arc oxidation (MAO) coatings were fabricated on ZK61M Mg alloy in alkaline electrolyte containing sodium phosphate, ferric citrate, and potassium glucose. The formation process of Fe3+ complexes in the electrolyte and the phase composition and coloration mechanisms of the MAO coatings were investigated. The results showed that Fe3+ complexes move to the anode and are liable to thermal decomposition continuously in the location of spark discharges, resulting in the formation of iron...

Read More thumbnail image: Black ceramic coatings prepared in phosphatebased electrolyte containing Fe3 complexes on ZK61M Mg alloy by microarc oxidation

Wireless coils based on resonant and nonresonant coupled‐wire structure for small animal multinuclear imaging

Published: Feb 17, 2019

Author(s): Tania S. Vergara Gomez, Marc Dubois, Stanislav Glybovski, Benoit Larrat, Julien Rosny, Carsten Rockstuhl, Monique Bernard, Redha Abdeddaim, Stefan Enoch, Frank Kober

Journal: NMR in Biomedicine

Earlier work on RF metasurfaces for preclinical MRI has targeted applications such as whole‐body imaging and dual‐frequency coils. In these studies, a nonresonant loop was used to induce currents into a metasurface that was operated as a passive inductively powered resonator. However, as we show in this study, the strategy of using a resonant metasurface reduces the impact of the loop on the global performance of the assembled coil. To mitigate this deficiency, we developed a new approach that...

Read More thumbnail image: Wireless coils based on resonant and nonresonant coupledwire structure for small animal multinuclear imaging

Determination of estrone and 17α‐ethinylestradiol in digested sludge by ultrasonic liquid extraction and high‐performance liquid chromatography with fluorescence detection

Published: Feb 15, 2019

Author(s): Vitória L. Louros, Diana L.D. Lima, Jorge H. Leitão, Valdemar I. Esteves, Helena G. Nadais

Journal: Journal of Separation Science

Abstract Estrone, 17β‐estradiol and 17α‐ethinylestradiol are increasingly recognised as important micropollutants to be monitored in wastewater treatment plants. These estrogens are retained onto sludge due to their high adsorption and since they are largely used in land applications, the monitoring of these chemicals in sludge samples is of great importance. This study describes a method for the determination of estrone and 17α‐ethinylestradiol in fresh sludge samples. After spiking fresh...

Read More thumbnail image: Determination of estrone and 17ethinylestradiol in digested sludge by ultrasonic liquid extraction and highperformance liquid chromatography with fluorescence detection

Fat suppression for ultrashort echo time imaging using a single‐point Dixon method

Published: Feb 15, 2019

Author(s): Hyungseok Jang, Michael Carl, Yajun Ma, Saeed Jerban, Tan Guo, Wei Zhao, Eric Y. Chang, Jiang Du

Journal: NMR in Biomedicine

Purpose In ultrashort echo time (UTE) imaging, fat suppression can improve short T2* contrast but can also reduce short T2* signals. The conventional two‐point Dixon (2p‐Dixon) method does not perform well due to short T2* decay. In this study, we propose a new method to suppress fat for high contrast UTE imaging of short T2 tissues, utilizing a single‐point Dixon (1p‐Dixon) method. Methods The proposed method utilizes dual‐echo UTE imaging, where UTE is followed by the second TE, chosen...

Read More thumbnail image: Fat suppression for ultrashort echo time imaging using a singlepoint Dixon method

Ultra‐high‐pressure‐assisted extraction of wedelolactone and isodemethylwedelolactone from Ecliptae Herba and purification by high‐speed counter‐current chromatography

Published: Feb 15, 2019

Author(s): Hongwei Zhao, Supan Cheng, Longfei Zhang, Hongjing Dong, Yongqing Zhang, Xiao Wang

Journal: Biomedical Chromatography

Abstract Ultra‐high‐pressure extraction combined with high‐speed counter‐current chromatography was employed to extract and purify wedelolactone and isodemethylwedelolactone from Ecliptae Herba. The operating conditions of ultra‐high‐pressure extraction were optimized using an orthogonal experimental design. The optimal conditions were 80% aqueous methanol solvent, 200 MPa pressure, 3 min extraction time and 1:20 (g/mL) solid–liquid ratio for extraction of wedelolactone and...

Read More thumbnail image: Ultrahighpressureassisted extraction of wedelolactone and isodemethylwedelolactone from Ecliptae Herba and purification by highspeed countercurrent chromatography

Microbial transformation of ambrisentan to its glycosides by Cunninghamella elegans

Published: Feb 15, 2019

Author(s): Rafaela Sponchiado, Julia Medeiros Sorrentino, Natália Olegário, Sendy Sales Oliveira, Leticia Malgarim Cordenonsi, Gustavo Pozza Silveira, Alexandre M. Fuentefria, Andreas S. L. Mendez, Martin Steppe, Cássia V. Garcia

Journal: Biomedical Chromatography

Abstract The purpose of this paper is to describe the glycosylation of ambrisentan (AMB) by cultures of Cunninghamella elegans ATCC 9245. AMB is an endothelin receptor antagonist, which is used to treat pulmonary arterial hypertension. Filamentous fungi are morphologically complex and may exhibit different forms depending on the species and the nature of the culture medium. A biotransformation study was conducted to investigate the ability of C. elegans to metabolize AMB. Parameters were...

Read More thumbnail image: Microbial transformation of ambrisentan to its glycosides by Cunninghamella elegans

Evaluation of ForenSeq™ Signature Prep Kit B on predicting eye and hair coloration as well as biogeographical ancestry by using Universal Analysis Software (UAS) and available web‐tools

Published: Feb 15, 2019

Author(s): Vishakha Sharma, Krupa Jani, Pavan Khosla, Erin Butler, Donald Siegel, Elisa Wurmbach

Journal: ELECTROPHORESIS

Abstract This study examined 266 individuals from various populations including African American, East Asian, South Asian, European, and mixed populations to evaluate the ForenSeq™ Signature Prep Kit Primer Mix B. Focus was placed on phenotypic and biogeographical ancestry predictions by Illumina's Universal Analysis Software (UAS). These outcomes were compared to those obtained through web‐tools developed at the Erasmus Medical Center (EMC) and available from the Forensic Resource/Reference...

Read More thumbnail image: Evaluation of ForenSeq Signature Prep Kit B on predicting eye and hair coloration as well as biogeographical ancestry by using Universal Analysis Software UAS and available webtools

Count‐rate, linearity, and performance of new backgammon detector technology

Published: Feb 14, 2019

Author(s): Hamish A. Melia, Jonathan W. Dean, Lucas F. Smale, Alexis J. Illig, Christopher T. Chantler

Journal: X-Ray Spectrometry

The meander wire backgammon technology has high levels of flux and spatial linearity across a wide range of energies. One of the attractive features of these technologies is the stability of response and robustness under long X‐ray exposure, compactness, and portability. A key problem historically has been the limited range of count‐rate for processing to the optimum resolution. We report dramatic advances in this and other areas appropriate for high‐accuracy experiments including tests of...

Read More thumbnail image: Countrate linearity and performance of new backgammon detector technology

X‐ray fluorescence analysis of samples simulating blood collected from uranium‐contaminated wounds

Published: Feb 14, 2019

Author(s): Yukie Izumoto, Tsugufumi Matsuyama, Kota Ishii, Yasuhiro Sakai, Yoshiyuki Oguri, Hiroshi Yoshii

Journal: X-Ray Spectrometry

Personnel working in nuclear fuel handling facilities incur a finite risk of injury and uranium contamination in any resulting wounds. The accidental absorption of uranium from the likes of wounds can lead to a significant degree of internal exposure due to its hazardous nature. Although an appropriate surgical resection of tissue in the contaminated wound is useful for suppressing the additional intake of uranium, the rapid quantification of uranium in the wound is required to avoid...

Read More thumbnail image: Xray fluorescence analysis of samples simulating blood collected from uraniumcontaminated wounds

Sensitive detection of hydroxymethylcytosine levels in normal and neoplastic cells and tissues

Published: Feb 14, 2019

Author(s): Annette M. Krais, Yoon Jung Park, Guido Reifenberger, Michael Meister, Christoph Plass, Heinz H. Schmeiser

Journal: ELECTROPHORESIS

Abstract A new sensitive analytical method using capillary electrophoresis with laser induced fluorescence (CE‐LIF) was applied for the simultaneous detection of DNA methylation and hydroxymethylation levels in human cancers of different origin. DNA hydroxymethylation, measured as 5‐hydroxymethylcytosine (5hmC) levels, was decreased in gliomas with mutation in the isocitrate dehydrogenase 1 (IDH1) gene when compared to IDH1‐wildtype gliomas. Independent from IDH1 mutation, 5hmC levels were...

Read More thumbnail image: Sensitive detection of hydroxymethylcytosine levels in normal and neoplastic cells and tissues

Cationic surfactant regulated synthesis of Au nanorods for sensitive detection of negatively charged colorants by surface‐enhanced Raman spectroscopy

Published: Feb 13, 2019

Author(s): Miao Qin, Pan Li, Xia Zhou, Jun Zhu, Hongyan Wang, Liangbao Yang

Journal: Journal of Raman Spectroscopy

Abstract Although surface‐enhanced Raman spectroscopy (SERS) has recently emerged as a powerful analytical tool, its widespread use is hindered by several inherent problems (e.g., low reproducibility) that need to be solved before further progress is possible. Herein, we used dodecyltrimethylammonium bromide (DTAB), N‐dodecyl‐N‐2‐hydroxyethyl‐N,N‐dimethylammonium bromide (C12HDAB), and N‐dodecyl‐N,N‐2‐dihydroxyethyl‐N‐methylammonium bromide (C12DHAB) as templates for the seed‐mediated growth...

Read More thumbnail image: Cationic surfactant regulated synthesis of Au nanorods for sensitive detection of negatively charged colorants by surfaceenhanced Raman spectroscopy

In situ full view of the Portland cement hydration by confocal Raman microscopy

Published: Feb 13, 2019

Author(s): Manuel Torres‐Carrasco, Adolfo Campo, Miguel A. Rubia, Encarnación Reyes, Amparo Moragues, Jose F. Fernández

Journal: Journal of Raman Spectroscopy

Abstract The study of the hydration reactions of Portland cement is well documented by conventional techniques such as X‐ray diffraction, differential thermal and thermogravimetric analysis, or NMR, for instance. However, a complete view of all the phases present in the reactions is elusive. In this study, by using an in situ analysis through confocal Raman microscopy (CRM), the reaction of the initial phases (C2S, C3S, and C3A) to form new crystalline phases (portlandite, ettringite, and...

Read More thumbnail image: In situ full view of the Portland cement hydration by confocal Raman microscopy

Metabolic profiling of synthetic cannabinoid 5F‐ADB by human liver microsome incubations and urine samples using high‐resolution mass spectrometry

Published: Feb 13, 2019

Author(s): Oya Yeter, Yeter Erol Ozturk

Journal: Drug Testing and Analysis

Abstract 5F‐ADB (methyl 2‐{[1‐(5‐fluoropentyl)‐1H‐indazole‐3‐carbonyl] amino}‐3,3‐dimethylbutanoate) is a frequently abused new synthetic cannabinoid that has been sold since at least the end of 2014 on the drug market and has been classified as an illicit drug in most European countries, as well as Turkey, Japan, and the United States. In this study, the in vitro metabolism of 5F‐ADB was investigated by using pooled human liver microsomes (HLMs) assay and liquid chromatography‐high‐resolution...

Read More thumbnail image: Metabolic profiling of synthetic cannabinoid 5FADB by human liver microsome incubations and urine samples using highresolution mass spectrometry

Diagram, valence‐to‐core, and hypersatellite Kβ X‐ray transitions in metallic chromium

Published: Feb 13, 2019

Author(s): Faisal Zeeshan, Joanna Hoszowska, Jean‐Claude Dousse, Dimosthenis Sokaras, Tsu‐Chien Weng, Roberto Alonso‐Mori, Matjaz Kavčič, Mauro Guerra, Jorge Miguel Sampaio, Fernando Parente, Paul Indelicato, José Pires Marques, José Paulo Santos

Journal: X-Ray Spectrometry

We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the present study confirms the line shape features observed in previous works, whereas the Khβ hypersatellite transition was...

Read More thumbnail image: Diagram valencetocore and hypersatellite K Xray transitions in metallic chromium

Advances in the histopathological characterization of breast tissue using combined X‐ray fluorescence and X‐ray diffraction data in a multivariate analysis approach

Published: Feb 13, 2019

Author(s): Eric M. Johnston, Erica Dao, Michael J. Farquharson

Journal: X-Ray Spectrometry

Previous studies have shown that the combination of X‐ray fluorescence and X‐ray diffraction data can be used as a histopathological characterization tool for breast tissue. Recent advances in energy‐dispersive X‐ray fluorescence techniques have allowed for benchtop systems to produce useful results in a reasonable time frame, allowing for clinical implementation to be realized. Using a polarized energy‐dispersive X‐ray fluorescence and energy‐dispersive X‐ray diffraction system optimized for...

Read More thumbnail image: Advances in the histopathological characterization of breast tissue using combined Xray fluorescence and Xray diffraction data in a multivariate analysis approach
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