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https://www.readbyqxmd.com/read/29679608/detection-and-quantitative-determination-of-heavy-metals-in-electronic-cigarette-refill-liquids-using-total-reflection-x-ray-fluorescence-spectrometry
#1
Eleni Kamilari, Konstantinos Farsalinos, Konstantinos Poulas, Christos G Kontoyannis, Malvina G Orkoula
Electronic cigarettes are considered healthier alternatives to conventional cigarettes containing tobacco. They produce vapor through heating of the refill liquids (e-liquids) which consist of propylene glycol, vegetable glycerin, nicotine (in various concentrations), water and flavoring agents. Heavy metals may enter the refill liquid during the production, posing a risk for consumer's health due to their toxicity. The objective of the present study was the development of a methodology for the detection and quantitative analysis of cadmium (Cd), lead (Pb), nickel (Ni), copper (Cu), arsenic (As) and chromium (Cr), employing Total Reflection X-Ray Fluorescence Spectroscopy (TXRF) as an alternative technique to ICP-MS or ICP-OES commonly used for this type of analysis...
April 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29679351/determination-of-trace-elements-in-infant-formulas-available-on-polish-market
#2
Ewelina Chajduk, Marta Pyszynska, Halina Polkowska-Motrenko
The aim of this study was to assess the levels of 13 essential and toxic elements (As, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Se, V, Zn) in the infant formulas, available on Polish market. Selected food samples were of animal (cow- and goat-based milks) and plant (soy-based milk, hypoallergic products, grain porridges) origin. Two analytical techniques, inductively coupled plasma mass spectrometry (ICP-MS) and neutron activation analysis (NAA), have been complementarily applied to analyze elemental content of 16 formulas dedicated for infants between 0 and 8 months...
April 21, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29678734/polymeric-micelle-mediated-delivery-of-half-sandwich-ruthenium-ii-complexes-with-phosphanes-derived-from-fluoroloquinolones-for-lung-adenocarcinoma-treatment
#3
Przemysław Kołoczek, Agnieszka Skórska-Stania, Agnieszka Cierniak, Victor Sebastian, Urszula K Komarnicka, Michał Płotek, Agnieszka Kyzioł
Novel half-sandwich ruthenium(II) complexes with aminomethyl(diphenyl)phosphine derived from fluoroloquinolones (RuPCp, RuPSf, RuPLm, RuPNr) were being investigated as alternatives to well-established metal-based chemotherapeutics. All compounds were characterized by elemental analysis, selected spectroscopic methods (i.e., absorption and fluorescence spectroscopy, ESI-MS, NMR, circular dichroizm), X-ray diffractometry, ICP-MS, and electrochemical techniques. To overcome low solubility, serious side effects connected with systemic cytotoxicity of ruthenium complexes, and acquiring the resistance of cancer cells, polymeric nanoformulations based on Pluronic P-123 micelles loaded with selected Ru(II) complexes were prepared and characterized...
April 17, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29677783/investigation-of-surface-properties-of-fluorocarbon-films-produced-using-plasma-techniques
#4
Se-Bi Jung, Youn-Jeong Cho, Jihye Lee, Kang-Bong Lee, Yeonhee Lee
Different fluorocarbon thin films were deposited on Si substrates using two different plasma polymerization methods. Fluorine-containing hydrophobic thin films were obtained using inductively coupled plasma (ICP) and capacitively coupled plasma (CCP) with a mixture of fluorocarbon precursors (C2F6, C3F8, or c-C4F8) and an unsaturated hydrocarbon (C2H2). Different process parameters for plasma polymerization (e.g., processing time) were used to generate various fluorocarbon thin films. The hydrophobic properties and mechanical properties of the new products were measured using a profilometer, water contact angle measurements, pencil hardness, and a 90° peel test...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29676197/pharmacokinetics-and-bioequivalence-of-two-strontium-ranelate-formulations-after-single-oral-administration-in-healthy-chinese-subjects
#5
Dan Zhang, Jingyi Ma, Aihua Du, Xiaolin Wang, Lina Zhang, Man Yang, Ming Deng, Huichen Liu
1. Pharmacokinetics of exogenous Sr and bioequivalence of a new oral formulation of strontium ranelate compared with the brand-name drug in healthy Chinese subjects was evaluated. 2. A balanced, randomized, single-dose, 2-treatment parallel study was conducted in 36 healthy Chinese subjects. Subjects were randomly allocated into two groups of 18 to receive a single oral dose of test formulation and reference formulation under a fasting state, respectively. Blood samples were collected at 19 designated time points up to 240 h post-dose...
April 20, 2018: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/29674479/regionally-clustered-abcc8-polymorphisms-in-a-prospective-cohort-predict-cerebral-oedema-and-outcome-in-severe-traumatic-brain-injury
#6
Ruchira Menka Jha, Theresa A Koleck, Ava M Puccio, David O Okonkwo, Seo-Young Park, Benjamin E Zusman, Robert S B Clark, Lori A Shutter, Jessica S Wallisch, Philip E Empey, Patrick M Kochanek, Yvette P Conley
OBJECTIVE: ABCC8 encodes sulfonylurea receptor 1, a key regulatory protein of cerebral oedema in many neurological disorders including traumatic brain injury (TBI). Sulfonylurea-receptor-1 inhibition has been promising in ameliorating cerebral oedema in clinical trials. We evaluated whether ABCC8 tag single-nucleotide polymorphisms predicted oedema and outcome in TBI. METHODS: DNA was extracted from 485 prospectively enrolled patients with severe TBI. 410 were analysed after quality control...
April 19, 2018: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/29674239/relationship-between-domestic-smoking-and-metals-and-rare-earth-elements-concentration-in-indoor-pm-2-5
#7
Gaspare Drago, Cinzia Perrino, Silvia Canepari, Silvia Ruggieri, Luca L'Abbate, Valeria Longo, Paolo Colombo, Daniele Frasca, Martin Balzan, Giuseppina Cuttitta, Gianluca Scaccianoce, Giuseppe Piva, Salvatore Bucchieri, Mario Melis, Giovanni Viegi, Fabio Cibella, Martin Balzan, David Bilocca, Charles Borg, Stephen Montefort, Christopher Zammit, Salvatore Bucchieri, Fabio Cibella, Paolo Colombo, Giuseppina Cuttitta, Gaspare Drago, Giuliana Ferrante, Luca L'Abbate, Stefania La Grutta, Valeria Longo, Mario R Melis, Silvia Ruggieri, Giovanni Viegi, Remo Minardi, Giuseppe Piva, Rosaria Ristagno, Gianfranco Rizzo, Gianluca Scaccianoce
Cigarette smoke is the main source of indoor chemical and toxic elements. Cadmium (Cd), Thallium (Tl), Lead (Pb) and Antimony (Sb) are important contributors to smoke-related health risks. Data on the association between Rare Earth Elements (REE) Cerium (Ce) and Lanthanum (La) and domestic smoking are scanty. To evaluate the relationship between cigarette smoke, indoor levels of PM2.5 and heavy metals, 73 children were investigated by parental questionnaire and skin prick tests. The houses of residence of 41 "cases" and 32 "controls" (children with and without respiratory symptoms, respectively) were evaluated by 48-h PM2...
April 16, 2018: Environmental Research
https://www.readbyqxmd.com/read/29674079/a-comparison-study-on-the-use-of-dowex-1-and-teva-resin-in-determination-of-99-tc-in-environmental-and-nuclear-coolant-samples-in-a-sia-system-with-icp-ms-detection
#8
Kamila Kołacińska, Zbigniew Samczyński, Jakub Dudek, Anna Bojanowska-Czajka, Marek Trojanowicz
This work refers to a comparative study of sorbents widely used in determinations of 99 Tc such as TEVA resin and Dowex 1. Despite having a similar functional group of quaternary amines, both materials represent different chromatographic methods-extraction (TEVA resin) and anion exchange (Dowex 1)-which provides a diverse range of their properties significant in determination of 99 Tc in flow conditions. The comparative tests, carried out in a SIA-LOV (Sequential Injection Analysis-Lab-on-Valve) system combined with mass spectrometric (ICP-MS) detection, considered several factors that are crucial from the standpoint of resin´s utility such as sorption capacity, durability, or selectivity, critical in 99 Tc separation from interferences...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674061/two-dimensional-weak-anion-exchange-chromatography-gel-electrophoresis-separations-coupling-to-inductively-coupled-plasma-mass-spectrometry-strategy-for-analysis-of-metalloproteins
#9
Xueting Yan, Bin He, Dingyi Wang, Ligang Hu, Lihong Liu, Chunyang Liao, Guibin Jiang
A two-dimensional (2-D, weak anion exchange chromatography-gel electrophoresis, WAX-GE) separations coupling to inductively coupled plasma mass spectrometry (ICP-MS) strategy was developed for efficient tracking of metalloproteins. Samples were fractionized with the primary dimension (WAX) and the collected fractions were subsequently subjected to the secondary dimension (GE) and finally detected with ICP-MS. The metalloproteins of interest from the secondary dimension were online split and collected for further manipulation...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674040/speciation-analysis-of-inorganic-arsenic-by-magnetic-solid-phase-extraction-on-line-with-inductively-coupled-mass-spectrometry-determination
#10
P Montoro Leal, E Vereda Alonso, M M López Guerrero, M T Siles Cordero, J M Cano Pavón, A García de Torres
Arsenic, one of the main environmental pollutants and potent natural poison, is a chemical element that is spread throughout the Earth's crust. It is well known that the toxicity of arsenic is highly dependent on its chemical forms. Generally, the inorganic species are more toxic than its organics forms, and As(III) is 60 times more toxic than As(V). In environmental waters, arsenic exists predominantly in two chemical forms: As(III) and As(V). In view of these facts, fast, sensitive, accurate and simple analytical methods for the speciation of inorganic arsenic in environmental waters are required...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29673159/iron-oxide-cobalt-nanocatalyst-for-o-tert-boc-protection-and-o-arylation-of-phenols
#11
Vilas B Gade, Anandarup Goswami, Rajender S Varma, Sharad N Shelke, Manoj B Gawande
Efficient and general protocols for the O - tert -boc protection and O -arylation of phenols were developed in this paper using a recyclable magnetic Fe₃O₄-Co₃O₄ nanocatalyst (Nano-Fe-Co), which is easily accessible via simple wet impregnation techniques in aqueous mediums from inexpensive precursors. The results showed the catalysts were well characterized by XRD (X-ray Diffraction), ICP-AES (Inductive Coupled Plasma Atomic Emission Spectroscopy), TEM (Transmission Electron Microscopy), TOF-SIMS (Time-Of-Flight Secondary Ion Mass Spectrometry) and XPS (X-ray Photoelectron Spectroscopy)...
April 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29671294/standard-of-care-controversies-and-innovations-in-the-medical-treatment-of-severe-traumatic-brain-injury-stbi
#12
Alba Scerrati, Silvia De Rosa, Lorenzo Mongardi, Michele A Cavallo, Giorgio Trapella, Pasquale De Bonis
Severe traumatic brain injury (STBI) is characterized by a primary injury which cannot be reversed and a secondary injury that can be prevented or reversed. Management of STBI patients in intensive care mainly aims at preventing the secondary injury. Treatment aims to: reducing ICP pressure (that can result in an ischemic insult); avoiding hypotension, hyperthermia, or hypoxemia; maintaining a normal electrolytes homeostasis; treating the Autonomic dysfunction syndrome, coagulopathies, Acute Kidney Injury and maintaining an adequate nutrition...
April 18, 2018: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/29670967/investigation-of-hsa-as-a-biocompatible-coating-material-for-arsenic-trioxide-nanoparticles
#13
Maneka Hoonjan, Geetanjali Sachdeva, Sudeshna Chandra, Prashant S Kharkar, Niteshkumar Sahu, Purvi Bhatt
The anticancer properties of arsenic trioxide (As2O3) are accompanied by highly cytotoxic effects on normal cells. This necessitates developing modalities towards the targeted delivery of As2O3. Albumins, on account of their large structure and presence of several interacting groups, are ideal for encapsulating or carrying various drugs. In the present study, human serum albumin (HSA) was chosen as a coating agent to increase the biocompatibility of As2O3. An in situ chemical precipitation method was adopted for the synthesis of HSA-coated As2O3 nanoparticles (HSA-As2O3NPs) that were further characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, inductively coupled plasma atomic emission spectrometry (ICP-AES), zeta potential and transmission electron microscopy (TEM)...
April 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29670877/identification-of-inhibitors-in-lignocellulosic-slurries-and-determination-of-their-effect-on-hydrocarbon-producing-microorganisms
#14
Shihui Yang, Mary Ann Franden, Qing Yang, Yat-Chen Chou, Min Zhang, Philip T Pienkos
The aim of this work was to identify inhibitors in pretreated lignocellulosic slurries, evaluate high-throughput screening strategies, and investigate the impact of inhibitors on potential hydrocarbon-producing microorganisms. Compounds present in slurries that could inhibit microbial growth were identified through a detailed analysis of saccharified slurries by applying a combination of approaches of high-performance liquid chromatography, GC-MS, LC-DAD-MS, and ICP-MS. Several high-throughput assays were then evaluated to generate toxicity profiles...
2018: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/29667678/real-time-monitoring-of-the-dissolution-kinetics-of-silver-nanoparticles-and-nanowires-in-aquatic-environments-using-an-aggregation-induced-emission-fluorogen
#15
Neng Yan, Sheng Xie, Ben Zhong Tang, Wen-Xiong Wang
We employed a fluorogenic Ag+ sensor, tetrazole-functionalized tetraphenylethylene derivative 1 (TEZ-TPE-1), to investigate the dissolution kinetics of AgNPs and AgNWs in aquatic environments. Real-time and quantitative monitoring of Ag+ release was achieved by using the proposed method, which agreed well with the conventional ICP-MS detection method.
April 18, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29666564/neural-induction-potential-and-mri-of-adscs-labeled-cationic-superparamagnetic-iron-oxide-nanoparticle-in-vitro
#16
Weiqiong Ma, Qi Xie, Baolin Zhang, Huixian Chen, Jianyi Tang, Zhengxian Lei, Minyi Wu, Dingxuan Zhang, Jiani Hu
Magnetic resonance imaging (MRI) combined with contrast agents is believed to be useful for stem cell tracking in vivo, and the aim of this research was to investigate the biosafety and neural induction of SD rat-originated adipose derived stem cells (ADSCs) using cationic superparamagnetic iron oxide (SPIO) nanoparticle which was synthesized by the improved polyol method, in order to allow visualization using in vitro MRI. The scan protocols were performed with T2-mapping sequence; meanwhile, the ultrastructure of labeled cells was observed by transmission electron microscopy (TEM) while the iron content was measured by inductively coupled plasma-atomic emission spectrometry (ICP-AES)...
2018: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/29666458/in-vivo-turnover-frequency-of-the-cyanobacterial-nife-hydrogenase-during-photohydrogen-production-outperforms-in-vitro-systems
#17
Kirstin Gutekunst, Dörte Hoffmann, Ulrike Westernströer, Rüdiger Schulz, Dieter Garbe-Schönberg, Jens Appel
Cyanobacteria provide all components for sunlight driven biohydrogen production. Their bidirectional NiFe-hydrogenase is resistant against low levels of oxygen with a preference for hydrogen evolution. However, until now it was unclear if its catalytic efficiency can keep pace with the photosynthetic electron transfer rate. We identified NikKLMQO (sll0381-sll0385) as a nickel transporter, which is required for hydrogen production. ICP-MS measurements were used to quantify hydrogenase molecules per cell. We found 400 to 2000 hydrogenase molecules per cell depending on the conditions...
April 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29665012/wavelet-pressure-reactivity-index-a-validation-study
#18
Xiuyun Liu, Marek Czosnyka, Joseph Donnelly, Danilo Cardim, Manuel Cabeleira, Peter J Hutchinson, Xiao Hu, Peter Smielewski, Ken Brady
KEY POINTS: The brain is vulnerable to damage from too little or too much blood flow. A physiological mechanism called cerebral autoregulation (CA) exists to maintain stable blood flow even if cerebral perfusion pressure (CPP) is changing. A robust method for assessing CA is not yet available. There are still some problems with the traditional measure, the pressure reactivity index (PRx). We introduced a new method, wavelet transform method (wPRx) to assess CA using data from two sets of controlled hypotension experiments in piglets: One set with artificially manipulated ABP oscillations; the other group were spontaneous ABP waves...
April 17, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29663590/use-of-deferasirox-exjade-for-iron-overload-in-peritoneal-dialysis-patients
#19
Erwin Yii, James Cg Doery, Zane Kaplan, Peter G Kerr
BACKGROUND: A 54 year old male with β-Thalassemia major developed ESRD and was managed with continuous ambulatory peritoneal dialysis. Although not able to be transfused due to high titre red cell antibodies he did require management of iron overload. Deferasirox (Exjade) was administered orally. There was concern that excretion of iron via the peritoneal dialysate may raise the risk of iron-dependent infections (Yersinia and Rhizopus). METHODS: Whilst receiving Exjade 1000mg /day, a total collection of 12...
April 16, 2018: Nephrology
https://www.readbyqxmd.com/read/29663282/the-frozen-brain-state-of-cryptococcus-gattii-a-globe-trotting-tropical-neurotropic-fungus
#20
Paul T Akins, Brian Jian
Initially reported in tropical regions, Cryptococcus gattii infection is now diagnosed globally. METHODS: case report; Literature review. Although initial reports described outbreaks of pulmonary and central nervous system (CNS) disease in tropical regions such as Australia and New Guinea, it is now clear that Cryptococcus gattii is a global, neurotropic pathogen. In contrast with C. neoformans, C. gattii patients are more likely to present with cryptococcomas in the brain and lungs and are often HIV negative...
April 16, 2018: Neurocritical Care
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