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mass trace

Xiaoqun Zhang, Ioannis Mantas, Alexandra Alvarsson, Takashi Yoshitake, Mohammadreza Shariatgorji, Marcela Pereira, Anna Nilsson, Jan Kehr, Per E Andrén, Mark J Millan, Karima Chergui, Per Svenningsson
The trace amine-associated receptor 1 (TAAR1) is expressed by dopaminergic neurons, but the precise influence of trace amines upon their functional activity remains to be fully characterized. Here, we examined the regulation of tyrosine hydroxylase (TH) by tyramine and beta-phenylethylamine (β-PEA) compared to 3-iodothyronamine (T1 AM). Immunoblotting and amperometry were performed in dorsal striatal slices from wild-type (WT) and TAAR1 knockout (KO) mice. T1 AM increased TH phosphorylation at both Ser19 and Ser40 , actions that should promote functional activity of TH...
2018: Frontiers in Pharmacology
Stefania Squadrone, Paola Brizio, Cecilia Mancini, Maria Cesarina Abete, Alfredo Brusco
Spinocerebellar ataxia type 2 (SCA2) is a neurological disorder characterized by cerebellar dysfunction. The possible association between metals and neurodegenerative diseases is under constant investigation, with particular focus on their involvement in oxidative stress and their potential role as biomarkers of these pathologies. Whole blood samples of SCA2 patients and of healthy individuals were subjected to multi-elemental analysis by inductively coupled plasma-mass spectrometry (ICP-MS). Reduced levels of manganese and copper were found in SCA2 patients, while zinc and vanadium concentrations were significantly higher in patients compared to controls...
May 2018: Journal of Trace Elements in Medicine and Biology
Zargham Mohammadi, Mohammad Javad Gharaat, Malcolm Field
Tracer breakthrough curves provide valuable information about the traced media, especially in inherently heterogeneous karst aquifers. In order to study the effect of variations in hydraulic gradient and conduit systems on breakthrough curves, a bench scale karst model was constructed. The bench scale karst model contains both matrix and a conduit. Eight tracing tests were conducted under a wide range of hydraulic gradients from 1 to greater than 5 for branchwork and network-conduit systems. Sampling points at varying distances from the injection point were utilized...
March 13, 2018: Ground Water
Ramananda Chakrabarti, Surajit Mondal, Shiba Shankar Acharya, J Sree Lekha, Debasis Sengupta
Evaluating the submarine groundwater discharge (SGD) derived strontium (Sr) flux from the Bengal Basin to the Bay of Bengal (BoB) and determining its isotopic composition is crucial for understanding the marine Sr isotopic evolution over time. Measurements of spatially and temporally distributed water samples collected from the BoB show radiogenic87 Sr/86 Sr, high Sr, calcium (Ca) concentrations and high salinity in samples collected dominantly from 100-120 m depth, which can be explained only by the contribution of saline groundwater from the Bengal Basin...
March 12, 2018: Scientific Reports
Jing Lu, Haipu Li, Yi Tu, Zhaoguang Yang
Parabens are preservatives widely used in foodstuffs, cosmetics and pharmaceuticals, which have led to elevated paraben concentrations in wastewater and receiving waters. Laboratory-scale batch experiments were conducted to investigate the adsorption and degradation of parabens in an aerobic activated sludge system. Results show that biodegradation plays a key role in removing parabens from the aerobic system of wastewater treatment plants, while adsorption on the sludge is not significant. The effects of parent paraben concentration, concentration of mixed liquor suspended solids (MLSS), initial pH and temperature on degradation were investigated using kinetic models...
March 9, 2018: Ecotoxicology and Environmental Safety
Ana Victoria Marta-Sanchez, Sergiane Souza Caldas, Antunielle Schneider, Sónia Maria Vaz Sanches Cardoso, Ednei Gilberto Primel
Parabens have been widely used as antimicrobial agents, mainly in food products, pharmaceuticals, and cosmetics. Although they are known as safe preservatives, they also cause some harm to human health, which has been discussed lately. Therefore, the aim of this study was to evaluate the occurrence of nine parabens (including isomers) in mineral and drinking waters, besides in drinking water treatment sludge (DWTS) samples with determination by liquid chromatography tandem mass spectrometry (LC-MS/MS). Both methods solid phase extraction (SPE) and QuEChERS were validated...
March 10, 2018: Environmental Science and Pollution Research International
Hye-Sung Kim, Hyun-Jae Cho, Soo-Myoung Bae, Young-Youn Kim, Sung-In Baek, Kwang-Hak Bae
The purpose of this study was to investigate whether or not the concentration levels of certain kinds of trace elements in hair are associated with periodontitis. We studied a total of 109 participants, which are composed of 25 participants with periodontitis and 84 participants without periodontitis. Periodontal conditions were assessed by measuring the periodontal clinical attachment loss and pocket depth, which were determined at six sites of all teeth. Periodontitis was defined according to the criteria of periodontitis proposed by CDC-AAP...
March 10, 2018: Biological Trace Element Research
Joaquim Rovira, Anna Hernández-Aguilera, Fedra Luciano-Mateo, Noemí Cabré, Gerard Baiges-Gaya, Martí Nadal, Vicente Martín-Paredero, Jordi Camps, Jorge Joven, José L Domingo
Oxidative stress and inflammation are candidate mechanisms to explain the potential role of exposure to metals and reduced activity of paraoxonase-1 (PON1) in age-related diseases. Both may be risk factors contributing to atherosclerosis. In the present study, inductively coupled mass spectrometry was used to explore multiple trace elements, while in-house methods were employed to measure PON1-related variables in patients with lower extremity artery disease (LEAD). Healthy controls were matched for sex, age, body weight, and relevant genotype variants...
March 10, 2018: Biological Trace Element Research
Vincenzo Positano, Antonella Meloni, Francesca Macaione, Maria Filomena Santarelli, Laura Pistoia, Andrea Barison, Salvatore Novo, Alessia Pepe
To compare image analysis methods for the assessment of left ventricle non-compaction from cardiac magnetic resonance (CMR) imaging. CMR images were analyzed in 20 patients and 10 normal subjects. A reference model of the MR signal was introduced and validated based on image data. Non-compact (NC) myocardium size and distribution were assessed by tracing a single, continuous contour delimiting trabeculated region (Jacquier) or by one-by-one selection of trabeculae (Grothoff). The global non-compact/compact (NC/C) ratio, the NC mass, and the segmental NC/C ratio were assessed...
March 9, 2018: International Journal of Cardiovascular Imaging
Alessandra H Ide, José Manuel F Nogueira
A new hybrid microextraction technique (hollow fiber microextraction) is presented that uses the main concepts and advantages of the modern miniaturized devices used for trace analysis. This novel analytical approach uses devices made of polypropylene membranes (10.0 mm long and 0.6 mm internal diameter) in which convenient organic solvents are embedded that promote fast kinetics during the enrichment process, using the floating sampling technology concept. An innovative analytical cycle is also proposed by use of low-cost disposable devices during the microextraction stage together with a user-friendly ("single liquid desorption step") back-extraction stage in compliance with green analytical chemistry principles...
March 10, 2018: Analytical and Bioanalytical Chemistry
Ming-Xiu Zhan, Ming-Feng Yu, Guangxue Zhang, Tong Chen, Xiao-Dong Li, Alfons Buekens
In order to find a catalyst to destroy polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) with high efficiency, a homemade VOx -CeOx /TiO2 catalyst was prepared, and then tested in the flue gas of a waste incinerator at temperatures of 180-240 °C. The results shows the best removal efficiency (93.4%) was attained already at 200 °C, yet degradation efficiency further raised with temperature, until 240 °C. Ozone (500 ppm) was also introduced into the system to increase the activity of catalyst, and removal efficiency of PCDD/Fs increased further to 97...
March 6, 2018: Waste Management
Lucyna Konieczna, Mariusz Belka, Magdalena Okońska, Magdalena Pyszka, Tomasz Bączek
In recent years, there has been an increasing worldwide interest in the use of alternative sample preparation methods that are proceeded by separation techniques. Fused deposition modeling (FDM) is a 3D printing technique that is based the consecutive layering of softened/melted thermoplastic materials. In this study, a group of natural steroids and sexual hormones - namely, aldosterone, cortisol, β-estradiol, testosterone, dihydrotestosterone, and synthetic methyltestosterone and betamethasone - were separated and determined using an optimized high-performance liquid chromatography coupled to mass spectrometry (LC-MS) method in positive ionization mode...
February 21, 2018: Journal of Chromatography. A
Farshid Mashayekhy Rad, Caroline Leck, Leopold L Ilag, Ulrika Nilsson
RATIONALE: Fatty acids are enriched in the ocean surface microlayer (SML) and have as a consequence been detected worldwide in sea spray aerosols. In searching for a relationship between the properties of the atmospheric aerosol and its ability to form cloud condensation nuclei and to promote cloud droplet formation over remote marine areas, the role of surface active fatty acids sourced from the SML is of interest to be investigated. Here is presented a fast method for profiling of major fatty acids in SML samples collected in the high Arctic (89 °N, 1 °W) in the summer of 2001...
March 9, 2018: Rapid Communications in Mass Spectrometry: RCM
Yanqing Liu, Hongwu Wang, Su Yao, Peijie Zhu
A fast and sensitive method involving ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was introduced to detect citrinin in dried orange peel. A series of extraction, purification, and chromatographic conditions was also systematically examined. With the proposed method, the obtained calibration graph was linear, with an R of 0.9996 within a concentration range of 0.5-10 ng/mL. The estimated limits of detection and quantification were 0.05 and 0.17 ng/mL, respectively. Under the selected conditions, the relative recoveries in different citrus products spiked with 1-10 ng/mL citrinin were 89...
March 8, 2018: Biomedical Chromatography: BMC
Wei Hong, Yining Zhao, Yuru Guo, Chengcheng Huang, Peng Qiu, Jia Zhu, Chun Chu, Hong Shi, Mingchun Liu
Although nano-self-assemblies of hydrophobic-modified bacitracin A with PLGA (Nano-BAPLGA) have demonstrated promising antibacterial activities, the application of Nano-BAPLGA was severely compromised by low water solubility. In this study, a series of PEGylated PLGA copolymers were selected to conjugate the N-terminus of bacitracin A in order to construct PEGylated self-assembled Nano-BAs and to further develop nano-self-assemblies of bacitracin A with strong antibacterial potency and high solubility. Compared with Nano-BAPLGA, all PEGylated Nano-BAs, except Nano-BA5K, exhibited strong antibacterial efficiency against both gram-positive and gram-negative bacteria by inducing loss of cytoplasmic membrane potential, membrane permeabilization and leakage of calcein from artificial cell membranes...
March 8, 2018: ACS Applied Materials & Interfaces
Elina M Karimullina, Lyudmila N Mikhailovskaya, Elena V Antonova, Vera N Pozolotina
The evaluation of radiation exposure in 14 species of herbaceous plants from the East-Ural Radioactive Trace (EURT) zone was performed, using the ERICA Tool, v. 1.2. Recent (up to 2015) levels of radionuclide activity concentration were measured in soil and vegetative plant mass.239,240 Pu content was used for the first time to estimate external dose rates for herbaceous plant species along the pollution gradient. In addition, a new approach to assessing the geometry of objects was adopted, including not only aboveground but also underground plant organs...
March 7, 2018: Environmental Science and Pollution Research International
Anatoly V Skalny, Alexey A Tinkov, Irina Voronina, Olga Terekhina, Margarita G Skalnaya, Tatiana G Bohan, Lyubov A Agarkova, Yulia Kovas
BACKGROUND: Trace elements play a significant role in the regulation of human reproduction, while advanced age may have a significant impact on trace element metabolism. The objective of the present study was to assess the impact of lifestyle factors on age-related differences in hair trace element content in pregnant women in the third trimester. METHODS: A total of 124 pregnant women aged 20–29 (n = 72) and 30–39 (n = 52) were ex- amined. Scalp hair trace element content was assessed using inductively coupled plasma mass spectrometry at NexION 300D (Perkin Elmer, USA) after microwave digestion...
January 2018: Acta Scientiarum Polonorum. Technologia Alimentaria
Xixiang Yang, Tomoko Imasaka, Totaro Imasaka
A standard sample mixture containing 51 pesticides was separated by gas chromatography (GC) and the constituents were identified by mass spectrometry (MS) using femtosecond lasers emitting at 267, 400, and 800 nm as the ionization source. A two-dimensional display of the GC/MS was successfully used for the determination of these compounds. A molecular ion was observed for 38 of the compounds at 267 nm and for 30 of the compounds at 800 nm, in contrast to 27 among 50 compounds when electron ionization was used...
March 6, 2018: Analytical Chemistry
Yuefang Li, Zhen Li, Giulio Cozzi, Clara Turetta, Carlo Barbante, Ju Huang, Longfei Xiong
In order to extract pollution signal of trace elements (TEs) in glacier snow at the Qinghai-Tibetan plateau of China by human activities, concentrations of 18 TEs (Al, Ti, Fe, Rb, Sr, Ba, V, Cr, Mn, Li, Cu, Co, Mo, Cs, Sb, Pb, Tl, and U), 14 rare earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), Y and Th in digested snow samples from five glaciers in April-May 2013 before monsoon season were measured. Results shown that higher TEs concentrations were found in glaciers at the northern plateau while lower concentrations in glaciers at the central and southern plateau...
February 23, 2018: Chemosphere
Adam Sajnóg, Anetta Hanć, Danuta Barałkiewicz
Analysis of clinical specimens by imaging techniques allows to determine the content and distribution of trace elements on the surface of the examined sample. In order to obtain reliable results, the developed procedure should be based not only on the properly prepared sample and performed calibration. It is also necessary to carry out all phases of the procedure in accordance with the principles of chemical metrology whose main pillars are the use of validated analytical methods, establishing the traceability of the measurement results and the estimation of the uncertainty...
May 15, 2018: Talanta
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