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https://www.readbyqxmd.com/read/28540462/development-of-a-hydrophilic-interaction-liquid-chromatography-coupled-with-matrix-assisted-laser-desorption-ionization-mass-spectrometric-imaging-platform-for-n-glycan-relative-quantitation-using-stable-isotope-labeled-hydrazide-reagents
#1
Zhengwei Chen, Xuefei Zhong, Cai Tie, Bingming Chen, Xinxiang Zhang, Lingjun Li
In this work, the capability of newly developed hydrophilic interaction liquid chromatography (HILIC) coupled with matrix-assisted laser desorption/ionization-mass spectrometric imaging (MALDI-MSI) platform for quantitative analysis of N-glycans has been demonstrated. As a proof-of-principle experiment, heavy and light stable-isotope labeled hydrazide reagents labeled maltodextrin ladder were used to demonstrate the feasibility of the HILIC-MALDI-MSI platform for reliable quantitative analysis of N-glycans...
May 25, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28539046/a-facile-chip-based-array-monolithic-microextraction-system-online-coupled-with-icpms-for-fast-analysis-of-trace-heavy-metals-in-biological-samples
#2
Jing Zhang, Beibei Chen, Han Wang, Man He, Bin Hu
Trace heavy metals have great impact on biological system, therefore, it is essential to develop suitable analytical methods for the determination of trace heavy metals in biological samples to elucidate their biochemical and physiological functions in organisms. Herein, we presented a chip-based array monolithic microextraction system and combined it with inductively coupled plasma mass spectrometry (ICPMS) for online analysis of trace Hg, Pb and Bi in real-world biological samples. Six ethylenediamine modified poly glycidyl methacrylate-co-ethylene glycol dimethacrylate (poly (GMA-co-EDMA-NH2)) capillary monolithic columns were embedded parallelly in microchannels of a microfluidic chip for array monolithic microextraction...
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28535762/gait-initiation-and-termination-strategies-in-patients-with-prader-willi-syndrome
#3
Veronica Cimolin, Nicola Cau, Manuela Galli, Cristina Santovito, Graziano Grugni, Paolo Capodaglio
BACKGROUND: Gait Initiation (GI) is a functional task representing one of the first voluntary destabilizing behaviours observed in the development of a locomotor pattern as the whole body centre of mass transitions from a large to a small base of support. Conversely, Gait Termination (GT) consists in the transition from walking to standing which, in everyday life, is a very common movement. Compared to normal walking, it requires higher control of postural stability. For a safe GT, the forward movement of the body has to be slowed down to achieve a stable upright position...
May 23, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28535670/ultrafast-spectroscopy-reveals-electron-transfer-cascade-that-improves-hydrogen-evolution-with-carbon-nitride-photocatalysts
#4
Kathryn L Corp, Cody W Schlenker
Solar hydrogen generation from water represents a compelling component of a future sustainable energy portfolio. Recently, chemically-robust heptazine-based polymers known as graphitic carbon nitrides (g-C3N4) have emerged as promising photocatalysts for hydrogen evolution using visible light while withstanding harsh chemical environments. However, since g-C3N4 electron transfer dynamics are poorly understood, rational design rules for improving activity remain unclear. Here, we use visible and near-infrared femtosecond transient absorption (TA) spectroscopy to reveal an electron transfer cascade that correlates with a near-doubling in photocatalytic activity from 2050 µmol h(-1)g(-1) to 3810 µmol h(-1)g(-1) when we infuse a suspension of bulk g-C3N4 with 10% mass loading of chemically exfoliated carbon nitride...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28532053/functionalized-fe3o4-graphene-oxide-nanocomposites-with-hairpin-aptamers-for-the-separation-and-preconcentration-of-trace-pb-2-from-biological-samples-prior-to-determination-by-icp-ms
#5
Mojtaba Shamsipur, Leila Farzin, Mahmoud Amouzadeh Tabrizi, Shahab Sheibani
Lead (Pb) as a topically poisonous metal represents a serious threat to the ecological environment and especially to human beings. Therefore, it is urgent to develop a rapid and reliable monitoring technique for this heavy metal in the environmental samples. In the present study, we have designed a selective and sensitive method for the determination of ultratrace contents of Pb(2+) in biological samples, based on the guanine (G)-quadruplex formed by the aptamer with hairpin structure and Pb(2+). For this purpose, Pb(2+) specific aptamer serving as affinity probe to capture and separate trace amounts of the analyte, was covalently linked to Fe3O4/graphene oxide (GO) surface by using a suitable cross-linking agent...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530587/trace-elements-in-raw-milk-of-buffaloes-bubalus-bubalis-from-campania-italy
#6
Mauro Esposito, Oto Miedico, Stefania Cavallo, Roberta Pellicanò, Guido Rosato, Loredana Baldi, A Eugenio Chiaravalle
The profile of 18 trace elements was traced in 68 milk samples collected from buffalo farms in the territory known as the "Land of Fires" in the Campania region (Italy). This area has been polluted by the illegal dumping in fields of industrial or domestic waste, wich is sometimes then burned spreading toxic contaminants. Milk from buffaloes raised on rural farms might be a good indicator of environmental contamination risk in the human food chain. Trace element analysis in milk was performed using mass spectrometry...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28530578/determination-of-trace-patulin-in-apple-based-food-matrices
#7
REVIEW
Xianjiang Li, Hongmei Li, Xiaomin Li, Qinghe Zhang
Patulin is a toxic metabolite of a number of fungi; its toxicity is serious and its contamination in food is a worldwide problem, especially in apple-based food. Effective control of patulin contamination strongly depends on reliable analytical methods. In this review, various analytical methods, especially those that have appeared in the last ten years, are summarized, including the highly reproducible chromatography and mass-spectrometry-based methods, highly selective sensor-based methods and indirect quantitative PCR methods...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28528311/rapid-screening-and-identification-of-chemical-hazards-in-surface-and-drinking-water-using-high-resolution-mass-spectrometry-and-a-case-control-filter
#8
Sarit L Kaserzon, Amy L Heffernan, Kristie Thompson, Jochen F Mueller, Maria Jose Gomez Ramos
Access to clean, safe drinking water poses a serious challenge to regulators, and requires analytical strategies capable of rapid screening and identification of potentially hazardous chemicals, specifically in situations when threats to water quality or security require rapid investigations and potential response. This study describes a fast and efficient chemical hazard screening strategy for characterising trace levels of polar organic contaminants in water matrices, based on liquid chromatography high resolution mass spectrometry with post-acquisition 'case-control' data processing...
May 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28527034/simultaneous-determination-of-selected-hormones-endocrine-disruptor-compounds-and-pesticides-in-water-medium-at-trace-levels-by-gc-ms-after-dispersive-liquid-liquid-microextraction
#9
Dotse Selali Chormey, Çağdaş Büyükpınar, Fatma Turak, Okan Tarık Komesli, Sezgin Bakırdere
The need to enhance food safety has led to major advancements in pesticide productions, and though many benefits have been gained, environmental contamination has also risen from these chemicals that tend to persist in the environment. Some pesticides, together with other chemicals commonly called endocrine disruptor compounds, block the receptor sites of hormones or mimic displaced hormones, leading to imbalanced hormonal levels that result in health disorders and diseases. These chemicals occur at trace levels and are not directly detected by conventional analytical methods...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28522161/effect-of-blue-and-violet-light-on-polymerization-shrinkage-vectors-of-a-cq-tpo-containing-composite
#10
Camila S Sampaio, Pablo J Atria, Frederick A Rueggeberg, Satoshi Yamaguchi, Marcelo Giannini, Paulo G Coelho, Ronaldo Hirata, Regina M Puppin-Rontani
OBJECTIVE: To evaluate the effect of light-curing wavelengths on composite filler particle displacement, and thus to visualize localized polymerization shrinkage in a resin-based composite (RBC) containing camphorquinone (CQ) and Lucirin TPO (TPO). METHODS: Three light-curing units (LCUs) were used to light-cure a RBC containing CQ and TPO: a violet-only, a blue-only, and a dual-wavelength, conventional (Polywave(®), emitting violet and blue wavelengths simultaneously)...
May 15, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28520442/t-2-toxin-3%C3%AE-glucoside-in-broiler-chickens-toxicokinetics-absolute-oral-bioavailability-and-in-vivo-hydrolysis
#11
Nathan Broekaert, Mathias Devreese, Marthe De Boevre, Sarah De Saeger, Siska Croubels
Due to the lack of information on bioavailability and toxicity of modified mycotoxins, current risk assessment on these modified forms assumes an identical toxicity of the modified form to their respective unmodified counterparts. Cross-over animal trials were performed with intravenous and oral administration of T-2 toxin (T-2) and T-2 toxin-3-glucoside (T2-G) to broiler chickens. Plasma concentrations of T2-G, T-2 and main phase I metabolites were quantified using a validated liquid chromatography-tandem mass spectrometry method with a limit of quantitation for all compounds of 0...
May 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28514452/isotopic-evidence-of-multiple-controls-on-atmospheric-oxidants-over-climate-transitions
#12
Lei Geng, Lee T Murray, Loretta J Mickley, Pu Lin, Qiang Fu, Andrew J Schauer, Becky Alexander
The abundance of tropospheric oxidants, such as ozone (O3) and hydroxyl (OH) and peroxy radicals (HO2 + RO2), determines the lifetimes of reduced trace gases such as methane and the production of particulate matter important for climate and human health. The response of tropospheric oxidants to climate change is poorly constrained owing to large uncertainties in the degree to which processes that influence oxidants may change with climate and owing to a lack of palaeo-records with which to constrain levels of atmospheric oxidants during past climate transitions...
May 17, 2017: Nature
https://www.readbyqxmd.com/read/28511153/-morbidity-rate-of-obesity-in-children-in-ukraine-overweight-as-noncontagious-disease-risk-factor
#13
Ірина Е Заболотна
INTRODUCTION: The upsurge of prevalence rate of obesity and overweight that in the majority of cases traces back to childhood is a risk factor of the most common noncontagious diseases in adults. THE AIM: The aim was to analyze prevalence of obesity in children in Ukraine and to conduct the pilot study of medical condition of overweight children. MATERIALS AND METHODS: Official state statistics of prevalence rate of obesity in kids and screening data of anthropometric characteristics, arterial tension levels, physical performance decrement and medical condition of children (boys - 50, girls - 90, average age - 15,1±0,1 years) was used in research...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28510597/ubiquitylation-of-the-acetyltransferase-mof-in-drosophila-melanogaster
#14
Sarah Schunter, Raffaella Villa, Victoria Flynn, Jan B Heidelberger, Anne-Kathrin Classen, Petra Beli, Peter B Becker
The nuclear acetyltransferase MOF (KAT8 in mammals) is a subunit of at least two multi-component complexes involved in transcription regulation. In the context of complexes of the 'Non-Specific-Lethal' (NSL) type it controls transcription initiation of many nuclear housekeeping genes and of mitochondrial genes. While this function is conserved in metazoans, MOF has an additional, specific function in Drosophila in the context of dosage compensation. As a subunit of the male-specific-lethal dosage compensation complex (MSL-DCC) it contributes to the doubling of transcription output from the single male X chromosome by acetylating histone H4...
2017: PloS One
https://www.readbyqxmd.com/read/28508669/efficient-discrimination-and-removal-of-phospholipids-during-electromembrane-extraction-from-human-plasma-samples
#15
Linda Vårdal, Astrid Gjelstad, Chuixiu Huang, Elisabeth Leere Øiestad, Stig Pedersen-Bjergaard
AIM: For the first time, extracts obtained from human plasma samples by electromembrane extraction (EME) were investigated comprehensively with particular respect to phospholipids using ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS). Thhe purpose was to investigate the potential of EME for phospholipid cleanup in different EME systems. RESULTS & DISCUSSION: No traces of phospholipids were detected in any of the acceptor solutions, whereas the model analytes were extracted with recoveries up to 50%...
May 16, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28508622/correlation-of-interface-impurities-and-chemical-gradients-with-high-magnetoelectric-coupling-strength-in-multiferroic-bifeo3-batio3-superlattices
#16
Michael Lorenz, Dietmar Hirsch, Christian Patzig, Thomas Höche, Stefan Hohenberger, Holger Hochmuth, Vera Lazenka, Kristiaan Temst, Marius Grundmann
The detailed understanding of magnetoelectric (ME) coupling in multiferroic oxide heterostructures is still a challenge. In particular, very little is known to date concerning the impact of the chemical interface structure and unwanted impurities that may be buried within short-period multiferroic BiFeO3-BaTiO3 superlattices during growth. Here, we demonstrate how trace impurities and elemental concentration gradients contribute to high ME voltage coefficients in thin film superlattices which are built from 15 double layers of BiFeO3-BaTiO3...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508188/trace-element-determination-and-cardioprotection-of-terminalia-pallida-fruit-ethanolic-extract-in-isoproterenol-induced-myocardial-infarcted-rats-by-icp-ms
#17
Shaik Althaf Hussain, Mohammed Abdul Kareem, Shaik Nayab Rasool, Suliman Yousef Al Omar, Alwasel Saleh, Manal Abdulrahman Al-Fwuaires, Jayasimha Rayalu Daddam, Kodidhela Lakshmi Devi
The trace elements and minerals in Terminalia pallida fruit ethanolic extract (TpFE) were determined by the instrument inductively coupled plasma-mass spectrometry (ICP-MS), and the cardioprotection of TpFE against isoproterenol (ISO)-administered rats was studied. Rats were pretreated with TpFE (100, 300, and 500 mg/kg bw) for 30 days, with concurrent administration of ISO (85 mg/kg bw) for two consecutive days. The levels of trace elements and minerals in TpFE were below the permitted limits of World Health Organization standards...
May 15, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28507202/determination-of-volatile-organic-compounds-exhaled-by-cell-lines-derived-from-hematological-malignancies
#18
Hongxia Tang, Yan Lu, Lulu Zhang, Zhonghui Wu, Xiaofang Hou, Hailong Xia
Background: The gas human exhaled contains many volatile organic compounds (VOCs), which is related to the health status of body. Analysis of VOCs has been proposed as a noninvasive diagnostic tool for certain cancers. Detailed research on the VOCs in gas exhaled by cell can characterize cell type specific metabolites and may be helpful to detect the cancer markers in clinical practice. Methods: Solid phase microextraction-gas chromatography-mass spectrometry was used to detect VOCs in the headspace of tissue culture flask in non-Hodgkin's lymphoma cell line JEKO and acute mononuclear leukemia cell line SHI-1, to elaborate the characteristic gaseous biomarkers of hematological malignancies...
May 15, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28505883/spatial-patterns-and-temporal-trends-of-trace-metal-mass-budgets-in-the-western-adriatic-sediments-mediterranean-sea
#19
Marilia Lopes-Rocha, Leonardo Langone, Stefano Miserocchi, Patrizia Giordano, Roberta Guerra
Spatial patterns of major (Al, Fe and Ti) and trace metals (Cu, Cr, Mn, Ni, Pb and Zn) measured in surficial sediments collected within the Late-Holocene mud-wedge in the western Adriatic Sea were analyzed to elucidate their sources, transport and mass budgets. Distributions of sedimentary trace metals, their fluvial inputs and accumulation loads reveal along-shore transport towards the southern Adriatic. Pb and to a lower extent Zn accumulation loads over time decreased significantly since 1988 in the North Adriatic, consistently with the implementation of regulations in the Western Europe, whereas Zn accumulation in the Po River prodelta remained unchanged since 1995...
May 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28502428/non-proximate-mass-spectrometry-using-a-heated-1-m-long-ptfe-tube-and-an-air-tight-apci-ion-source
#20
Dilshadbek T Usmanov, Kenzo Hiraoka, Hiroshi Wada, Masaya Matsumura, Sachiyo Sanada-Morimura, Hiroshi Nonami, Shinichi Yamabe
Direct and rapid trace-level gas analysis is highly needed in various fields such as safety and security, quality control, food analysis, and forensic medicine. In many cases, the real samples are bulky and are not accessible to the space-limited ion source of the mass spectrometer. In order to circumvent this problem, we developed an airtight atmospheric-pressure chemical ionization (APCI) ion source equipped with a flexible 1-m-long, 2-mm-i.d. PTFE sniffing tube. The ambient air bearing sample gas was sucked into the heated PTFE tube (130 °C) and was transported to the air-tight ion source without using any extra pumping system or a Venturi device...
June 22, 2017: Analytica Chimica Acta
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