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Mercury toxicity

Sayani Das, Anindita Sarkar, Ananya Rakshit, Ankona Datta
We report the serendipitous discovery of an optical mercury sensor while trying to develop a water-soluble manganese probe. The sensor is based on a pentaaza macrocycle conjugated to a hemicyanine dye. The pentaaza macrocycle earlier designed in our group was used to develop photoinduced electron transfer (PET)-based "turn-on" fluorescent sensors for manganese. (1) In an attempt to increase the water-solubility of the manganese sensors we changed the dye from BODIPY to hemicyanine. The resultant molecule qHCM afforded a distinct reversible change in the absorption features and a concomitant visible color change upon binding to Hg2+ ions, leading to a highly water-soluble mercury sensor with a 10 ppb detection limit...
April 18, 2018: Inorganic Chemistry
Dong Peng, Li Zhang, Ru-Ping Liang, Jian-Ding Qiu
Mercuric ion (HgII) is a stable form of mercury pollution with high toxicity and bioaccumulation ability, and the sensitive and visible determination is of great importance. Herein, a simple method to magically improve the complexation reaction rate between porphyrin and manganous ions (MnII) have been proposed by using the synergistic effect of trace nitrogen doped graphene quantum dots (NGQDs) and Hg(II). A mechanism is proposed in accordance with a substitution reaction in which the deformed porphyrin nucleus by relatively larger Hg(II) ions is favourable for attacking of small divalent metal ions carried by NGQDs from the back...
April 18, 2018: ACS Sensors
Yongxiang Han, Zhanglin Ni, Shiliang Li, Minghua Qu, Fubin Tang, Runhong Mo, Caifen Ye, Yihua Liu
Walnut is one of the most popular nuts worldwide and contains various mineral nutrients. Little is known, however, about the relationship between toxic heavy metals in walnuts and growth soil. In this study, we investigated the distribution, relationship, and risk assessment of five toxic heavy metals-lead (Pb), arsenic (As), chromium (Cr), cadmium (Cd), and mercury (Hg)-in walnuts and growth soil in the main production areas of China. The results showed that the main heavy metal pollution in walnut and soil was Pb and Cd...
April 14, 2018: Environmental Science and Pollution Research International
Miguel Ángel Lominchar, María José Sierra, María Jiménez-Moreno, María Guirado, Rosa Carmen Rodríguez Martín-Doimeadios, Rocío Millán
Monomethylmercury (MeHg) is one of the most toxic and the most commonly occurring organomercury compound and the wetlands are one of the main areas of generation of this Hg form. Concretely, it is in the macrophyte root system where better conditions are given for its generation. However, the knowledge of absorption and subsequent distribution of mercury (Hg) and monomethylmercury in aquatic plants is still limited. Mercury mining district such as Almadén (Ciudad Real, Spain) is a natural laboratory where different rivers flow and the species Typha domingensis Pers...
April 11, 2018: Environmental Science and Pollution Research International
Mark Xavier Bailon, Anneschel Sheehan David, Yeongeon Park, Eunhee Kim, Yongseok Hong
Heavy metal contamination in aquatic systems is a big problem in many areas around the world. In 2016, high mercury concentrations were reported in bivalves (Corbicula leana) and sediments near the confluence of the Hyeongsan River and Chilseong Creek located in Pohang, a steel industrial city in the south-east coast of the Korean peninsula. Given that both the Chilseong and Gumu creeks run through the Pohang industrial complex and ultimately flow to the Hyeongsan River, it is imperative to determine if the industrial effluents have any impact on the mercury contamination in these two streams and the Hyeongsan River...
April 11, 2018: Environmental Monitoring and Assessment
Tommaso Filippini, Marcella Malavolti, Silvia Cilloni, Lauren A Wise, Federica Violi, Carlotta Malagoli, Luciano Vescovi, Marco Vinceti
Regular consumption of fish is generally recommended by authorities because fish is an important source of essential nutrients. However, the presence of potentially toxic contaminants in fish has raised many concerns about the food's safety for human health. In the present study, we used a validated semi-quantitative food frequency questionnaire to assess the dietary habits of a representative sample of 719 individuals (319 males and 400 females) aged 18-87 years residing in Northern Italy. We estimated weekly dietary intakes of Arsenic (As) and Mercury (Hg), and we compared them with safety standards set by the European Food Safety Authority...
April 4, 2018: Food and Chemical Toxicology
Aneta Dorota Pacyna, Katarzyna Koziorowska, Stanisław Chmiel, Jan Mazerski, Żaneta Polkowska
Over the years, noticeable effort has been directed towards contaminant determination in multiple biotic samples collected from the inhabitants of the Arctic. Little consideration has been given to polar herbivores, however, especially those from the European parts of the Arctic. To provide a broader perspective, we aimed to decipher trace element concentration in hairs of the key species in the Arctic, namely the Svalbard reindeer (Rangifer tarandus platyrhynchus), and to recognise whether diet variations could correspond with forward exposure...
March 23, 2018: Chemosphere
Maki Tokumoto, Jin-Yong Lee, Akinori Shimada, Chiharu Tohyama, Masahiko Satoh
Inorganic mercury is a harmful heavy metal that causes severe kidney damage. Glutathione (GSH), a tripeptide comprising L-glutamic acid, glycine and L-cysteine, and metallothionein (MT), a cysteine-rich and metal-binding protein, are biologically important protective factors for renal toxicity by inorganic mercury. However, the relationship between GSH and MT for the prevention of renal toxicity by inorganic mercury is unknown. We examined the sensitivity of the mice depleted in GSH by treatment with L-Buthionine-SR-sulfoximine (L-BSO), and MT-I/II null mice genetically deleted for MT-I and MT-II, to inorganic mercury (HgCl2 )...
2018: Journal of Toxicological Sciences
Amelia Geraldine Peregrina-Chávez, María Del Rayo Ramírez-Galindo, Rolando Chávez-Martínez, Cesar Anuar Delahanty-Delgado, Fernando Vazquez-Alaniz
Background: The biological behaviour and clinical significance of mercury toxicity vary according to its chemical structure. Mercury differs in its degree of toxicity and in its effects on the nervous, digestive and immune systems as well as on organs such as the lungs, kidneys, skin, eyes and heart. Human exposure occurs mainly through inhalation of elemental mercury vapours during industrial and artisanal processes such as artisanal and small-scale gold mining. Case presentation: A 52-years-old female, housewife, with a body mass index of 25...
April 2, 2018: International Journal of Environmental Research and Public Health
Celestina E Sobral-Souza, Ana R P Silva, Nadghia F Leite, José G M Costa, Irwin R A Menezes, Francisco A B Cunha, Larissa A Rolim, Henrique D M Coutinho
This study aimed to verify the chelating, antioxidant and cytoprotective activities of Psidium brownianum Mart. Ex DC against mercury and aluminum. The ethanolic extract, as well as the tannic and flavonoid fractions, were prepared and subjected to liquid chromatography-mass spectrometry analysis. Ferric ion reduction and antioxidant activity measurement using the FRAP method were performed with P. brownianum. After determining the sub-allelopathic doses, germination tests using Lactuca sativa (lettuce) seeds were performed...
March 21, 2018: Journal of Hazardous Materials
Zhiqiang Chen, Xusheng Wang, Xian Cheng, WeiJuan Yang, Yongning Wu, FengFu Fu
Methyl-mercury (CH3 Hg+ ) and ethyl-mercury (C2 H5 Hg+ ) have much higher toxicity than Hg2+ and can be more easily accumulated by organisms to form severe bio-amplification. Hence, the specific and on-site detection of CH3 Hg+ and C2 H5 Hg+ in seafood is of great significance and a hard challenge. We herein designed two T-rich aptamers (HT5 and HT7 ) for specifically recognizing CH3 Hg+ and the total of CH3 Hg+ and C2 H5 Hg+ , respectively. In the presence of all Au3+ , Ag+ and T-rich aptamer, CH3 Hg+ and C2 H5 Hg+ specifically and preferentially bind with aptamer and thus induced the formation alloy Ag-Au nanoparticles after reduction, which lead to the color change in solution...
March 30, 2018: Analytical Chemistry
Marcello Tonelli, Natasha Wiebe, Aminu Bello, Catherine J Field, John S Gill, Brenda R Hemmelgarn, Daniel T Holmes, Kailash Jindal, Scott W Klarenbach, Braden J Manns, Ravi Thadhani, David Kinniburgh
BACKGROUND AND OBJECTIVES: Deficiency of essential trace elements and excess of potentially toxic trace elements are common in patients on hemodialysis. Whether these abnormalities are associated with poor outcomes is unknown but worth investigating, because they are potentially treatable. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We did a prospective longitudinal study of 1278 patients on incident hemodialysis, assessing blood concentrations of 25 trace elements at baseline...
March 29, 2018: Clinical Journal of the American Society of Nephrology: CJASN
Anastasios Economou
This work reviews the field of screen-printed electrodes (SPEs) modified with "green" metals for electrochemical stripping analysis of toxic elements. Electrochemical stripping analysis has been established as a useful trace analysis technique offering many advantages compared to competing optical techniques. Although mercury has been the preferred electrode material for stripping analysis, the toxicity of mercury and the associated legal requirements in its use and disposal have prompted research towards the development of "green" metals as alternative electrode materials...
March 29, 2018: Sensors
Dung Quang Le, Behara Satyanarayana, Siau Yin Fui, Kotaro Shirai
The present study, aimed at observing the total concentration of mercury (Hg) in edible finfish species with an implication to human health risk, was carried out from the Setiu mangrove wetlands on the east coast of Peninsular Malaysia. Out of 20 species observed, the highest Hg concentrations were found among carnivores-fish/invertebrate-feeders, followed by omnivores and carnivores-invertebrate-feeders, while the lowest concentrations in herbivores. The Hg concentrations varied widely with fish species and body size, from 0...
March 26, 2018: Biological Trace Element Research
Ping Li, Buyun Du, Hing Man Chan, Xinbin Feng, Baixiang Li
Recent evidence indicated that methylmercury (MeHg) contaminated rice can be a significant source of MeHg human exposure, but the health implications are not known. The objective of this study was to study the kinetics, speciation, and effects of MeHg contaminated rice using a rat model. Five groups of adult Sprague-Dawley rats (n=10 in each group) were fed control rice, low (10ng/g MeHg) and high (25ng/g MeHg) MeHg contaminated rice. Two groups of the positive control were fed control rice spiked with the same levels of MeHgCl...
March 21, 2018: Science of the Total Environment
Karthik Balasundaram, Mukesh Sharma
Mercury (Hg) emitted from coal-based thermal power plants (CTPPs) can accumulate and bio-magnify in the food chain, thereby posing a risk to humans and wildlife. The central idea of this study was to develop an adsorbent which can concurrently remove elemental mercury (Hg0 ) and SO2 emitted from coal-based thermal power plants (CTPPs) in a single unit operation. Specifically, a composite adsorbent of CaCO3 impregnated with 2-mercaptobenimidazole (2-MBI) (referred to as modified calcium carbonate (MCC)) was developed...
March 22, 2018: Environmental Science and Pollution Research International
Bowen Ke, Hui Chen, Lin Ma, Sarah Zingales, Deying Gong, Die Hu, Lupei Du, Minyong Li
Mercury is a highly toxic environmental pollutant that negatively affects human health. Thus, an in vivo method for noninvasive imaging of mercury(ii) and visualization of its accumulation within living systems would be advantageous. Herein, we describe a reaction-based bioluminescent probe for detection of mercury(ii) in vitro and accumulation in vivo. The application of this probe would help to shed light on the intricate contributions of mercury(ii) to various physiological and pathological processes.
March 21, 2018: Organic & Biomolecular Chemistry
Ali Nayfeh, Thamer Kassim, Noor Addasi, Faysal Alghoula, Christopher Holewinski, Zachary Depew
Background: Mercury exists in multiple forms: elemental, organic, and inorganic. Its toxic manifestations depend on the type and magnitude of exposure. The role of colonoscopic decompression in acute mercury toxicity is still unclear. We present a case of acute elemental mercury toxicity secondary to mercury ingestion, which markedly improved with colonoscopic decompression. Clinical Case: A 54-year-old male presented to the ED five days after ingesting five ounces (148 cubic centimeters) of elemental mercury...
2018: Case Reports in Medicine
J A Campos, J M Esbrí, M M Madrid, R Naharro, J Peco, E M García-Noguero, J A Amorós, M M Moreno, P Higueras
Mercury is considered a very toxic element and important efforts are currently being made aimed at reduce or even eliminating its usage. Despite this trend, there are still sites where contamination by this metal is very marked, especially in the mining environment of Almadén where it has been exploited for thousands of years. The several forms in which Hg occurs in the soil interact differently with the organisms that live in/on it. The soil is a place where many biotic and abiotic variables act together...
February 27, 2018: Chemosphere
Joanna A Ruszkiewicz, Adi Pinkas, Mahfuzur R Miah, Rebecca L Weitz, Michael J A Lawes, Ayodele J Akinyemi, Omamuyovwi M Ijomone, Michael Aschner
Due to many advantages Caenorhabditis elegans (C. elegans) has become a preferred model of choice in many fields, including neurodevelopmental toxicity studies. This review discusses the benefits of using C. elegans as an alternative to mammalian systems and gives examples of the uses of the nematode in evaluating the effects of major known neurodevelopmental toxins, including manganese, mercury, lead, fluoride, arsenic and organophosphorus pesticides. Reviewed data indicates numerous similarities with mammals in response to these toxins...
March 14, 2018: Toxicology and Applied Pharmacology
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