101
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Yang B, Wu W. Fabrication of a novel natural cellulose-based paper chemodosimeter via grafting-to of Rhodamine B moieties for detection of Hg2+. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2013.08.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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102
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Amaro-Estrada JI, Maron L, Ramírez-Solís A. Aqueous Solvation of Hg(OH)2: Energetic and Dynamical Density Functional Theory Studies of the Hg(OH)2–(H2O)n (n = 1–24) Structures. J Phys Chem A 2013; 117:9069-75. [DOI: 10.1021/jp405500f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- J I Amaro-Estrada
- Departamento de Física, Facultad de Ciencias, Universidad Autónoma del Estado de Morelos , Av. Universidad 1001, Cuernavaca, Morelos, 62209, México
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103
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104
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Kim JH, Noh JY, Hwang IH, Lee JJ, Kim C. A NBD-based selective colorimetric and fluorescent chemosensor for Hg2+. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.05.074] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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105
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Isaad J, El Achari A. Azathia crown ether possessing a dansyl fluorophore moiety functionalized silica nanoparticles as hybrid material for mercury detection in aqueous medium. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.072] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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106
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Le MT, Hassanin M, Mahadeo M, Gailer J, Prenner EJ. Hg- and Cd-induced modulation of lipid packing and monolayer fluidity in biomimetic erythrocyte model systems. Chem Phys Lipids 2013; 170-171:46-54. [PMID: 23523984 DOI: 10.1016/j.chemphyslip.2013.03.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Revised: 01/31/2013] [Accepted: 03/05/2013] [Indexed: 01/05/2023]
Abstract
The public health consequences that are associated with the low level exposure of various human populations to Cd(2+) and Hg(2+) are incompletely understood. In order to assess if interactions between these inorganic pollutants and erythrocyte biomembranes may contribute to their chronic toxicity, we have used a Langmuir trough to probe the effect of HgCl2 and CdCl2 on the packing and elasticity properties of biomimetic lipid monolayers using different lipid mixtures. These lipid films were deposited at room temperature on a biologically relevant subphase (1mM phosphate, 100mM NaCl at pH 7.4) in the absence and presence of 100μM HgCl2, CdCl2 and 1:1 mixtures thereof. The interactions of heavy metals with the lipids were monitored as changes in the surface pressure (π)-area (A) isotherms. In addition, metal induced changes to the elastic properties of the model systems were analyzed by area and compressibility data of phosphatidylcholine (PC) systems containing 0, 15, 30, 45 and 100% phosphatidylethanolamine (PE) and phosphatidylserine (PS). These mixtures revealed changes in lateral lipid packing as indicated by area expansion as well as enhanced film rigidity. The results demonstrate that both heavy metals affected the various lipid matrices, but metal mixtures showed the strongest impact. Based on these data, the adverse interaction of Hg(2+) and Cd(2+) with lipid bilayer membranes is identified as a feasible mechanism by which these toxic metals exert toxicity in mammalian cells. Interestingly, these metal interactions were found to depend on the lipid composition.
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Affiliation(s)
- Mary T Le
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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107
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Amaro-Estrada J, Ramírez-Solís A. Aqueous microsolvation of HgClOH. A systematic MP2 study of the HgClOH–(H2O)n species with n=1–4. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2012.11.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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108
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Zhang X, Zhao H, Cao X, Feng N, Tian D, Li H. Hg2+ wettability and fluorescence dual-signal responsive switch based on a cysteine complex of piperidine-calix[4]arene. Org Biomol Chem 2013; 11:8262-8. [DOI: 10.1039/c3ob41794h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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109
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Bhardwaj VK, Sharma H, Kaur N, Singh N. Fluorescent organic nanoparticles (FONs) of rhodamine-appended dipodal derivative: highly sensitive fluorescent sensor for the detection of Hg2+ in aqueous media. NEW J CHEM 2013. [DOI: 10.1039/c3nj01086d] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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110
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Gupta RK, Pandey R, Singh R, Srivastava N, Maiti B, Saha S, Li P, Xu Q, Pandey DS. Heteroleptic Dipyrrinato Complexes Containing 5-Ferrocenyldipyrromethene and Dithiocarbamates as Coligands: Selective Chromogenic and Redox Probes. Inorg Chem 2012; 51:8916-30. [DOI: 10.1021/ic300900m] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Rakesh Kumar Gupta
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
| | - Rampal Pandey
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
| | - Roopshikha Singh
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
| | - Nitin Srivastava
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
| | - Biswajit Maiti
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
| | - Satyen Saha
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
| | - Peizhou Li
- National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Qiang Xu
- National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Daya Shankar Pandey
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi-221
005 (U.P.), India
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111
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Gomiero A, Sforzini S, Dagnino A, Nasci C, Viarengo A. The use of multiple endpoints to assess cellular responses to environmental contaminants in the interstitial marine ciliate Euplotes crassus. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 114-115:206-216. [PMID: 22459342 DOI: 10.1016/j.aquatox.2012.02.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 02/21/2012] [Accepted: 02/26/2012] [Indexed: 05/31/2023]
Abstract
This paper presents the results of investigations on the suitability of Euplotes crassus, an interstitial marine ciliate, to be used as model organism in ecotoxicology and thereafter to evaluate the toxicity of estuarine and coastal sediments upon laboratory exposure. Nowadays, anthropogenic activities have resulted in accumulation of metals and organic pollutants in the environment as well as in the food chain hence leading to serious ecological and human health problems. This may pose a risk to benthic and epibenthic organisms and it is crucial to discover toxicity tests that will identify adverse effects of sediment-associated chemicals on benthic organisms. Due to their nature as a eukaryotic cell/organism and their position in the food web, ciliated protozoa are suitable models for evaluating the effects of pollution on aquatic communities. Lethal and sublethal effects of exposure to inorganic and organic pollutants were tested on the cell mortality, replication rate, lysosomal membrane stability and endocytosis rate of E. crassus. Increasing nominal concentrations of individual and mixtures of mercury, copper, and benzo(a)pyrene were investigated in this study as they might be bioavailable in naturally occurring polluted sites. A significant decrease in the mean replication rate (p<0.05) was found after 24h exposures to m/μM concentrations of all tested pollutants. At the same time, significant decreases of lysosomal membrane stability (p<0.05) were observed for Cu (5 μM), Hg (10 nM), and B(a)P (200 nM). Among the entire suite of tests, endocytosis rate test demonstrated the highest sensitivity. Exposures to binary mixtures of all studied pollutants were performed showing both inorganic-organic and inorganic-inorganic additive and/or antagonist effects. Moreover, medium salinity was also varied to mimic estuarine-like environmental conditions linking biological response to ionic strengths. Under these conditions significant increases of both endocytosis rate and lysosomal membrane stability were observed and related to the increment of some Hg- and Cu-related toxic complexes. The studied biomarkers were always able to discriminate between the effects of organic and inorganic pollutants. Together with the short time and simplicity of the test procedures, results obtained in this study indicate that E. crassus is a promising and convenient bioindicator for evaluating the toxicity of different environmental matrixes like pore water, sediments and wastewaters--polluted by metals and organic pollutants.
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Affiliation(s)
- A Gomiero
- DISIT, University of West Piedmont "Amedeo Avogadro", Viale T. Michel 11, IT-15121 Alessandria, Italy.
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112
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Lu W, Qin X, Liu S, Chang G, Zhang Y, Luo Y, Asiri AM, Al-Youbi AO, Sun X. Economical, green synthesis of fluorescent carbon nanoparticles and their use as probes for sensitive and selective detection of mercury(II) ions. Anal Chem 2012; 84:5351-7. [PMID: 22681704 DOI: 10.1021/ac3007939] [Citation(s) in RCA: 582] [Impact Index Per Article: 48.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The present article reports on a simple, economical, and green preparative strategy toward water-soluble, fluorescent carbon nanoparticles (CPs) with a quantum yield of approximately 6.9% by hydrothermal process using low cost wastes of pomelo peel as a carbon source for the first time. We further explore the use of such CPs as probes for a fluorescent Hg(2+) detection application, which is based on Hg(2+)-induced fluorescence quenching of CPs. This sensing system exhibits excellent sensitivity and selectivity toward Hg(2+), and a detection limit as low as 0.23 nM is achieved. The practical use of this system for Hg(2+) determination in lake water samples is also demonstrated successfully.
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Affiliation(s)
- Wenbo Lu
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, P. R. China
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113
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Zhang JR, Huang WT, Xie WY, Wen T, Luo HQ, Li NB. Highly sensitive, selective, and rapid fluorescence Hg2+ sensor based on DNA duplexes of poly(dT) and graphene oxide. Analyst 2012; 137:3300-5. [PMID: 22655290 DOI: 10.1039/c2an35528k] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Coupling T base with Hg(2+) to form stable T-Hg(2+)-T complexes represents a new direction in detection of Hg(2+). Here a graphene oxide (GO)-based fluorescence Hg(2+) analysis using DNA duplexes of poly(dT) that allows rapid, sensitive, and selective detection is first reported. The Hg(2+)-induced T(15)-(Hg(2+))(n)-T(15) duplexes make T(15) unable to hybridize with its complementary A(15) labelled with 6'-carboxyfluorescein (FAM-A(15)), which has low fluorescence in the presence of GO. On the contrary, when T(15) hybridizes with FAM-A(15) to form double-stranded DNA because of the absence of Hg(2+), the fluorescence largely remains in the presence of GO. A linear range from 10 nM to 2.0 μM (R(2) = 0.9963) and a detection limit of 0.5 nM for Hg(2+) were obtained under optimal experimental conditions. Other metal ions, such as Al(3+), Ag(+), Ca(2+), Ba(2+), Mg(2+), Zn(2+), Mn(2+), Co(2+), Pb(2+), Ni(2+), Cu(2+), Cd(2+), Cr(3+), Fe(2+), and Fe(3+), had no significant effect on Hg(2+) detection. Moreover, the sensing system was used for the determination of Hg(2+) in river water samples with satisfactory results.
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Affiliation(s)
- Jian Rong Zhang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
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114
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Kumar A, Kumar S. Anthroneamine based chromofluorogenic probes for Hg2+ detection in aqueous solution. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.134] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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115
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Bhalla V, Roopa, Kumar M, Sharma PR, Kaur T. New Fluorogenic Sensors for Hg2+ Ions: Through-Bond Energy Transfer from Pentaquinone to Rhodamine. Inorg Chem 2012; 51:2150-6. [DOI: 10.1021/ic201990q] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vandana Bhalla
- Department of Chemistry, UGC Sponsored-Centre
for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Roopa
- Department of Chemistry, UGC Sponsored-Centre
for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Manoj Kumar
- Department of Chemistry, UGC Sponsored-Centre
for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Parduman Raj Sharma
- Department of Cancer
Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Tandeep Kaur
- Department of Cancer
Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
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116
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Hernández-Cobos J, Ramírez-Solís A, Maron L, Ortega-Blake I. Theoretical study of the aqueous solvation of HgCl2: Monte Carlo simulations using second-order Moller-Plesset-derived flexible polarizable interaction potentials. J Chem Phys 2012; 136:014502. [PMID: 22239784 DOI: 10.1063/1.3673780] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
A study of the solvation of HgCl(2) including ab initio aggregates of up to 24 water molecules and the results of extensive Monte Carlo simulations for the liquid phase using MP2-derived interaction potentials is presented. The interaction potentials are flexible, polarizable, and include non-additive effects. We conclude that a cluster description of the solvation mechanism is limited when compared to the condensed phase. The molecular image derived from the MC simulations is peculiar. It resembles that of a hydrophobic solute, which explains the rather easy passage of this neutral molecule through the cell membrane; however, it also shows an intermittent binding of one, two, or three water molecules to HgCl(2) in the fashion of a hydrophilic solute.
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Affiliation(s)
- J Hernández-Cobos
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62210, México.
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117
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Liu W, Chen J, Xu L, Wu J, Xu H, Zhang H, Wang P. Reversible "off-on" fluorescent chemosensor for Hg2+ based on rhodamine derivative. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 85:38-42. [PMID: 22018584 DOI: 10.1016/j.saa.2011.08.071] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 08/24/2011] [Accepted: 08/29/2011] [Indexed: 05/31/2023]
Abstract
A novel and simple fluorescent chemosensor based on rhodamine was designed and synthesized to detect Hg(2+) with high selectivity. The structure of chemosensor 1 was characterized by IR, (1)H NMR, and HRMS spectroscopies. Chemosensor 1 exhibited distinct fluorescent and colorimetric changes toward Hg(2+) in an ethanol/water (80/20, v/v) solution, which resulted in the formation of 1/Hg(2+) complex with the Hg(2+)-induced ring opening of the spirolactam ring in rhodamine. The reversibility of chemosensor 1 was verified through its spectral response toward Hg(2+) ions and TBAI (tetrabutylammonium iodide) titration experiments.
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Affiliation(s)
- Weimin Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
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118
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Luxami V, Verma M, Rani R, Paul K, Kumar S. FRET-based ratiometric detection of Hg2+ and biothiols using naphthalimide–rhodamine dyads. Org Biomol Chem 2012; 10:8076-81. [DOI: 10.1039/c2ob25794g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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119
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A new fluorescent sensor bearing three dansyl fluorophores for highly sensitive and selective detection of mercury(II) ions. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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120
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Ruan YB, Xie J. Unexpected highly selective fluorescence ‘turn-on’ and ratiometric detection of Hg2+ based on fluorescein platform. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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121
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Castro L, Dommergue A, Renard A, Ferrari C, Ramirez-Solis A, Maron L. Theoretical study of the solvation of HgCl2, HgClOH, Hg(OH)2 and HgCl3(-): a density functional theory cluster approach. Phys Chem Chem Phys 2011; 13:16772-9. [PMID: 21860852 DOI: 10.1039/c1cp22154j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The determination of the solvation shell of Hg(II)-containing molecules and especially the interaction between Hg(II) and water molecules is the first requirement to understand the transmembrane passage of Hg into the cell. We report a systematic DFT study by stepwise solvation of HgCl(2) including up to 24 water molecules. In order to include pH and salinity effects, the solvation patterns of HgClOH, Hg(OH)(2) and HgCl(3)(-) were also studied using 24 water molecules. In all cases the hydrogen bond network is crucial to allow orbital-driven interactions between Hg(II) and the water molecules. DFT Born-Oppenheimer molecular dynamics simulations starting from the stable HgCl(2)-(H(2)O)(24) structure revealed that an HgCl(2)-(H(2)O)(3) trigonal bipyramid effective solute appears and then the remaining 21 water molecules build a complete first solvation shell, in the form of a water-clathrate. In the HgCl(2), HgClOH, Hg(OH)(2)-(H(2)O)(24) optimized structures Hg also directly interacts with 3 water molecules from an orbital point of view (three Hg-O donor-acceptor type bonds). All the other interactions are through hydrogen bonding. The cluster-derived solvation energies of HgCl(2), HgClOH and Hg(OH)(2) are estimated to be -34.4, -40.1 and -47.2 kcal mol(-1), respectively.
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Affiliation(s)
- Ludovic Castro
- Université de Toulouse, INSA, UPS, LPCNO, Toulouse, France
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122
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Carbon nanoparticle for highly sensitive and selective fluorescent detection of mercury(II) ion in aqueous solution. Biosens Bioelectron 2011; 26:4656-60. [DOI: 10.1016/j.bios.2011.03.026] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Revised: 03/19/2011] [Accepted: 03/27/2011] [Indexed: 11/20/2022]
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123
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Li H, Zhai J, Sun X. Nano-C60 as a novel, effective fluorescent sensing platform for mercury(II) ion detection at critical sensitivity and selectivity. NANOSCALE 2011; 3:2155-2157. [PMID: 21465019 DOI: 10.1039/c1nr10052a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The present communication demonstrates the use of water-soluble nano-C(60) as a novel, effective fluorescent sensing platform for Hg(2+) detection for the first time. This sensing system achieves a detection limit as low as 500 pM and exhibits excellent selectivity.
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Affiliation(s)
- Hailong Li
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, Jilin, China
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124
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A simple and sensitive fluorescent sensing platform for Hg²+ ions assay based on G-quenching. Talanta 2011; 85:713-7. [PMID: 21645763 DOI: 10.1016/j.talanta.2011.04.063] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2011] [Revised: 04/19/2011] [Accepted: 04/21/2011] [Indexed: 11/22/2022]
Abstract
In this work, a novel fluorescence biosensor was demonstrated for detection of Hg(2+) ions with relatively high selectivity and sensitivity. The sensing scheme was based on G-quenching induced by Hg(2+) ions. In the presence of Hg(2+) ions, the single-stranded signal probe which has carboxylfluorescein (FAM) and guanine segment at its 5' and 3' ends, respectively, folded into duplex-like structure via the Hg(2+)-mediated coordination of T-Hg(2+)-T base pairs. It brought guannine segment close to the dye and caused a remarkable decrease of fluorescence signal. The sensor showed a sensitive response to Hg(2+) ions in a concentration range from 0.5 to 10 μM, and a detection limit of 0.5 nM was given. This homogeneous system required only a single-labeled oligonucleotide, operated by concise procedures, and possessed comparable sensitivity as previous approaches. Furthermore, the sensor exhibits a great perspective for future practical applications.
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125
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Larose C, Dommergue A, Marusczak N, Coves J, Ferrari CP, Schneider D. Bioavailable mercury cycling in polar snowpacks. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:2150-2156. [PMID: 21341797 DOI: 10.1021/es103016x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Polar regions are subject to contamination by mercury (Hg) transported from lower latitudes, severely impacting human and animal health. Atmospheric Mercury Depletion Events (AMDEs) are an episodic process by which Hg is transferred from the atmospheric reservoir to arctic snowpacks. The fate of Hg deposited during these events is the subject of numerous studies, but its speciation remains unclear, especially in terms of environmentally relevant forms such as bioavailable mercury (BioHg). Here, using a bacterial mer-lux biosensor, we report the fraction of newly deposited Hg at the surface and at the bottom of the snowpack that is bioavailable. Snow samples were collected over a two-month arctic field campaign in 2008. In surface snow, BioHg is related to atmospheric Hg deposition and snow fall events were shown to contribute to higher proportions of BioHg than AMDEs. Based on our data, AMDEs represent a potential source of 20 t.y(-1) of BioHg, while wet and dry deposition pathways may provide 135-225 t.y(-1) of BioHg to Arctic surfaces.
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Affiliation(s)
- Catherine Larose
- Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS - Université Joseph Fourier Grenoble, 54 Rue Molière, 38400 St Martin d'Hères, France
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126
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Kumar M, Kumar N, Bhalla V, Singh H, Sharma PR, Kaur T. Naphthalimide Appended Rhodamine Derivative: Through Bond Energy Transfer for Sensing of Hg2+ Ions. Org Lett 2011; 13:1422-5. [DOI: 10.1021/ol2001073] [Citation(s) in RCA: 205] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manoj Kumar
- Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India, and Department of Cancer Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Naresh Kumar
- Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India, and Department of Cancer Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Vandana Bhalla
- Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India, and Department of Cancer Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Hardev Singh
- Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India, and Department of Cancer Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Parduman Raj Sharma
- Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India, and Department of Cancer Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Tandeep Kaur
- Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India, and Department of Cancer Pharmacology, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
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127
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Quang DT, Wu JS, Luyen ND, Duong T, Dan ND, Bao NC, Quy PT. Rhodamine-derived Schiff base for the selective determination of mercuric ions in water media. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:753-756. [PMID: 21215691 DOI: 10.1016/j.saa.2010.12.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 12/06/2010] [Indexed: 05/28/2023]
Abstract
A new rhodamine-derived Schiff base (RS) was synthesized and its sensing property to metal ions was investigated by UV/vis and fluorescence spectroscopies. Addition of Hg2+ ions to the aqueous solution of RS gave a visual color change as well as significantly fluorescent enhancement, while other ions including Pb2+, Cd2+, Cr3+, Zn2+, Cu2+, Fe2+, Co3+, Ni2+, Ca2+, Mg2+, K+ and Na+ ions did not induce any distinct color/spectral changes, which constituted a Hg2+-selective fluorescent OFF-ON chemosensor. The Hg2+-induced ring-opening of spirolactam of rhodamine in RS resulted in the dual chromo- and fluorogenic observation.
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129
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Sun L, Li Y, Sun M, Wang H, Xu S, Zhang C, Yang Q. Porphyrin-functionalized Fe3O4@SiO2 core/shell magnetic colorimetric material for detection, adsorption and removal of Hg2+ in aqueous solution. NEW J CHEM 2011. [DOI: 10.1039/c1nj20307j] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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130
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Chen Y, Sun ZH, Song BE, Liu Y. Naphthylthiourea-modified permethylcyclodextrin as a highly sensitive and selective “turn-on” fluorescent chemosensor for Hg2+ in water and living cells. Org Biomol Chem 2011; 9:5530-4. [DOI: 10.1039/c1ob05221g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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131
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Chen C, Dong H, Chen Y, Guo L, Wang Z, Sun JJ, Fu N. Dual-mode unsymmetrical squaraine-based sensor for selective detection of Hg2+ in aqueous media. Org Biomol Chem 2011; 9:8195-201. [DOI: 10.1039/c1ob06519j] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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132
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Wang L, Tian J, Li H, Zhang Y, Sun X. A Novel Single-Labeled Fluorescent Oligonucleotide Probe for Mercury(II) Ion Detection: Using the Inherent Quenching of Deoxyguanosines. J Fluoresc 2010; 21:1049-52. [PMID: 21152961 DOI: 10.1007/s10895-010-0785-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Accepted: 11/25/2010] [Indexed: 11/24/2022]
Affiliation(s)
- Lei Wang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
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133
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Han ZX, Zhang XB, Li Z, Mao GJ, Jin Z, Shen GL, Yu RQ, Wu XY. A Highly Sensitive Quinoline-Containing Rhodamine B Thiohydrazide Based Fluorescent Probe for Hg2+in Aqueous Solution and Living Cells. ANAL LETT 2010. [DOI: 10.1080/00032711003763582] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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134
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Kišidayová S, Houserová P, Váradyová Z, Mihaliková K, Pristaš P, Javorský P. Bacterial–protozoal interactions in a microbial community of rumen ciliateEntodinium caudatumculture under mercury stress. Can J Microbiol 2010; 56:202-8. [DOI: 10.1139/w09-121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We examined the role of rumen ciliates, using Entodinium caudatum as a model organism, in the detoxification of soluble mercury(II) in vitro under conditions with enhanced or reduced diversity of a co-culture bacterial population as well as the effects of long-term mercury(II) stress on in vitro fermentation parameters and major mercury detoxification products. The E. caudatum growth depended on the capability of the co-culture bacterial population to develop resistance to mercury(II) chloride and on culture conditions. The production of fermentation gas was reduced (P < 0.01) in contrast to methane production. Proportions of volatile fatty acids were affected; however, the total concentration of volatile fatty acids was not influenced. No organic mercury species were detected after long-term application (>1 month) of mercury(II) chloride. The major mercury species was inorganic mercury(II) with substantial accumulation in the bacterial fraction (70%) and less in black sediment (21%) and ciliate fraction (9%) at the 25 µmol/L mercury(II) dose. The data indicate that free-living bacteria protect the ciliate cells by transforming mercury(II) into its insoluble forms.
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Affiliation(s)
- S. Kišidayová
- Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, Košice 04001, Slovak Republic
- Mendel University of Agriculture and Forestry, Department of Chemistry and Biochemistry, Zemedelska 1, Brno CZ-61300, Czech Republic
| | - P. Houserová
- Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, Košice 04001, Slovak Republic
- Mendel University of Agriculture and Forestry, Department of Chemistry and Biochemistry, Zemedelska 1, Brno CZ-61300, Czech Republic
| | - Z. Váradyová
- Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, Košice 04001, Slovak Republic
- Mendel University of Agriculture and Forestry, Department of Chemistry and Biochemistry, Zemedelska 1, Brno CZ-61300, Czech Republic
| | - K. Mihaliková
- Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, Košice 04001, Slovak Republic
- Mendel University of Agriculture and Forestry, Department of Chemistry and Biochemistry, Zemedelska 1, Brno CZ-61300, Czech Republic
| | - P. Pristaš
- Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, Košice 04001, Slovak Republic
- Mendel University of Agriculture and Forestry, Department of Chemistry and Biochemistry, Zemedelska 1, Brno CZ-61300, Czech Republic
| | - P. Javorský
- Institute of Animal Physiology, Slovak Academy of Sciences, Šoltésovej 4-6, Košice 04001, Slovak Republic
- Mendel University of Agriculture and Forestry, Department of Chemistry and Biochemistry, Zemedelska 1, Brno CZ-61300, Czech Republic
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135
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Fan Y, Long YF, Li YF. A sensitive resonance light scattering spectrometry of trace Hg2+ with sulfur ion modified gold nanoparticles. Anal Chim Acta 2009; 653:207-11. [DOI: 10.1016/j.aca.2009.09.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Revised: 09/11/2009] [Accepted: 09/13/2009] [Indexed: 11/17/2022]
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136
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Zhao N, Wu YH, Wen HM, Zhang X, Chen ZN. Conversion from ILCT to LLCT/MLCT Excited State by Heavy Metal Ion Binding in Iridium(III) Complexes with Functionalized 2,2′-Bipyridyl Ligands. Organometallics 2009. [DOI: 10.1021/om900334f] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Na Zhao
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China
| | - Yu-Hui Wu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China
| | - Hui-Min Wen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China
| | - Xu Zhang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China
| | - Zhong-Ning Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
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137
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Chapleau RR, Sagermann M. Real-time in vivo imaging of mercury uptake in Caenorhabditis elegans through the foodchain. Toxicology 2009; 261:136-42. [DOI: 10.1016/j.tox.2009.05.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 05/08/2009] [Accepted: 05/11/2009] [Indexed: 12/16/2022]
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138
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Tang B, Ding B, Xu K, Tong L. Use of Selenium to Detect Mercury in Water and Cells: An Enhancement of the Sensitivity and Specificity of a Seleno Fluorescent Probe. Chemistry 2009; 15:3147-51. [DOI: 10.1002/chem.200802165] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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139
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Jana A, Kim JS, Jung HS, Bharadwaj PK. A cryptand based chemodosimetric probe for naked-eye detection of mercury(ii) ion in aqueous medium and its application in live cell imaging. Chem Commun (Camb) 2009:4417-9. [DOI: 10.1039/b907646h] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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140
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Ramo JD, Pastor A, Díaz‐Mayans J, Medina J, Torreblanca A. Determination of mercury by cold‐vapour technique in several tissues of treated American red crayfish (Procambarus clarkii). ACTA ACUST UNITED AC 2008. [DOI: 10.1080/10934528809375416] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- J. Del Ramo
- a Laboratory of Animal Physiology, Faculty of Biological Sciences , University of Valencia , Dr. Moliner,50. Burjassot, Valencia, Spain
| | - A. Pastor
- b Analytical Chemistry, University College of Castellon , University of Valencia , P.O. Box 224, Castellon, Spain
| | - J. Díaz‐Mayans
- a Laboratory of Animal Physiology, Faculty of Biological Sciences , University of Valencia , Dr. Moliner,50. Burjassot, Valencia, Spain
| | - J. Medina
- b Analytical Chemistry, University College of Castellon , University of Valencia , P.O. Box 224, Castellon, Spain
| | - A. Torreblanca
- a Laboratory of Animal Physiology, Faculty of Biological Sciences , University of Valencia , Dr. Moliner,50. Burjassot, Valencia, Spain
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141
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Zhang X, Xiao Y, Qian X. A Ratiometric Fluorescent Probe Based on FRET for Imaging Hg2+Ions in Living Cells. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200803246] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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142
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Zhang X, Xiao Y, Qian X. A Ratiometric Fluorescent Probe Based on FRET for Imaging Hg2+Ions in Living Cells. Angew Chem Int Ed Engl 2008; 47:8025-9. [DOI: 10.1002/anie.200803246] [Citation(s) in RCA: 733] [Impact Index Per Article: 45.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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143
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144
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Pedersen SA, Kristiansen E, Andersen RA, Zachariassen KE. Cadmium is deposited in the gut content of larvae of the beetle Tenebrio molitor and involves a Cd-binding protein of the low cysteine type. Comp Biochem Physiol C Toxicol Pharmacol 2008; 148:217-22. [PMID: 18603479 DOI: 10.1016/j.cbpc.2008.05.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 05/23/2008] [Accepted: 05/23/2008] [Indexed: 11/22/2022]
Abstract
Binding of cadmium (Cd) to metallothionein (MT) and non-MT proteins with low contents of cysteine has been observed in terrestrial arthropods. We recently isolated a Cd-binding protein with no cysteine that was induced in Cd-exposed larvae of the beetle Tenebrio molitor. In this study we have examined the molecular distribution of Cd within extracts of different tissues and compartments of Cd-exposed T. molitor larvae. A Cd-peak consistent with the low cysteine Cd-binding protein was induced within the gut content where it could be detected after 4-8 days of exposure. Examination of gut wall tissue revealed no increase in Cd-binding capacity, indicating that no accumulation of MTs was taking place in this tissue. Incorporation of Cd in the gut wall tissue stabilized after 8 days of Cd-exposure at a rather low level compared to the other organs. There was a statistical trend towards Cd being incorporated in the gut content in a manner that was disproportionally high compared to the amount of Cd in the gut wall tissue. The possible role of the low cysteine Cd-binding protein in reducing the uptake of Cd in the tissues is discussed.
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Affiliation(s)
- S A Pedersen
- Laboratory of Ecophysiology and Toxicology, Institute of Biology, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.
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145
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Heo J, Meng F, Sachs F, Hua SZ. Dynamic effects of Hg2+-induced changes in cell volume. Cell Biochem Biophys 2008; 51:21-32. [PMID: 18365146 DOI: 10.1007/s12013-008-9010-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Accepted: 01/25/2008] [Indexed: 01/13/2023]
Abstract
Using a microfluidic volume sensor, we studied the dynamic effects of Hg2+ on hypotonic stress-induced volume changes in CHO cells. A hypotonic challenge to control cells caused them to swell but did not evoke a significant regulatory volume decrease (RVD). Treatment with 100 muM HgCl2 caused a substantial increase in the steady-state volume following osmotic stress. Continuous hypotonic challenge following a single 10-min exposure to HgCl2 produced a biphasic volume increase with a steady-state volume 100% larger than control cells. Repeated hypotonic challenges to cells exposed once to Hg2+ resulted in a sequential approach to the same steady-state volume. Stimulation after reaching steady state caused a reduction in peak cell volume. Repeated stimulation was different than continuous stimulation resulting in a more rapid approach to steady state. Substituting extracellular Na+ with impermeant NMDG+ in the hypotonic solution produced a rapid RVD-like volume decrease and eliminated the Hg2+-induced excess swelling. The volume decrease in the presence of Hg2+ was inhibited by tetraethylammonium and 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid disodium, blockers of K+ and Cl(-) channels, respectively, suggesting that part of the Hg2+ effect was increasing NaCl influx over KCl efflux. The presence of multiple phases of steady-state volume and their sensitivity to the stimulation history suggests that factors beyond solute fluxes, such as modification of mechanical stress within the cytoskeleton also plays a role in the response to hypotonic stress.
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Affiliation(s)
- Jinseok Heo
- Department of Mechanical and Aerospace Engineering, SUNY-Buffalo, 340 Jarvis Hall, Buffalo, NY 14260, USA
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146
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Stacey SP, McLaughlin MJ, Cakmak I, Hettiarachchi GM, Scheckel KG, Karkkainen M. Root uptake of lipophilic zinc-rhamnolipid complexes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:2112-2117. [PMID: 18303840 DOI: 10.1021/jf0729311] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This study investigated the formation and plant uptake of lipophilic metal-rhamnolipid complexes. Monorhamnosyl and dirhamnosyl rhamnolipids formed lipophilic complexes with copper (Cu), manganese (Mn), and zinc (Zn). Rhamnolipids significantly increased Zn absorption by Brassica napus var. Pinnacle roots in (65)Zn-spiked ice-cold solutions, compared with ZnSO4 alone. Therefore, rhamnolipid appeared to facilitate Zn absorption via a nonmetabolically mediated pathway. Synchrotron XRF and XAS showed that Zn was present in roots as Zn-phytate-like compounds when roots were treated with Zn-free solutions, ZnSO4, or Zn-EDTA. With rhamnolipid application, Zn was predominantly found in roots as the Zn-rhamnolipid complex. When applied to a calcareous soil, rhamnolipids increased dry matter production and Zn concentrations in durum (Triticum durum L. cv. Balcali-2000) and bread wheat (Triticum aestivum L. cv. BDME-10) shoots. Rhamnolipids either increased total plant uptake of Zn from the soil or increased Zn translocation by reducing the prevalence of insoluble Zn-phytate-like compounds in roots.
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Affiliation(s)
- Samuel P Stacey
- Soil and Land Systems, School of Earth and Environmental Sciences, The University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia.
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147
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Effect of pH on intracellular accumulation of trace concentrations of Hg(II) in Escherichia coli under anaerobic conditions, as measured using a mer-lux bioreporter. Appl Environ Microbiol 2007; 74:667-75. [PMID: 18083863 DOI: 10.1128/aem.00717-07] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The effects of pH on the uptake and accumulation of Hg(II) by Escherichia coli were determined at trace, environmentally relevant, concentrations of Hg and under anaerobic conditions. Hg(II) accumulation was measured using inducible light production from E. coli HMS174 harboring a mer-lux bioreporter plasmid (pRB28). The effect of pH on the toxicity of higher concentrations of Hg(II) was measured using a constitutive lux plasmid (pRB27) in the same bacterial host. In this study, intracellular accumulation and toxicity of Hg(II) under anaerobic conditions were both significantly enhanced with decreasing pH over the pH range of 8 to 5. The pH effect on Hg(II) accumulation was most pronounced at pHs of <6, which substantially enhanced the Hg(II)-dependent light response. This enhanced response did not appear to be due to pH stress, as similar results were obtained whether cells were grown at the same pH as the assay or at a different pH. The enhanced accumulation of Hg(II) was also not related to differences in the chemical speciation of Hg(II) in the external medium resulting from the changes in pH. Experiments with Cd(II), also detectable by the mer-lux bioreporter system, showed that Cd(II) accumulation responded differently to pH changes than the net accumulation of Hg(II). Potential implications of these findings for our understanding of bacterial accumulation of Hg(II) under anaerobic conditions and for bacteria-mediated cycling of Hg(II) in aquatic ecosystems are discussed. Arguments are provided suggesting that this differential accumulation is due to changes in uptake of mercury.
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148
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Semin BK, Davletshina LN, Bulychev AA, Ivanov II, Seibert M, Rubin AB. Effect of calcium chelators on the formation and oxidation of the slowly relaxing reduced plastoquinone pool in calcium-depleted PSII membranes. Investigation of the F0 yield. BIOCHEMISTRY (MOSCOW) 2007; 72:1205-15. [DOI: 10.1134/s0006297907110065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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149
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Yang H, Zhou Z, Huang K, Yu M, Li F, Yi T, Huang C. Multisignaling Optical-Electrochemical Sensor for Hg2+ Based on a Rhodamine Derivative with a Ferrocene Unit. Org Lett 2007; 9:4729-32. [DOI: 10.1021/ol7020143] [Citation(s) in RCA: 306] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hong Yang
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Zhiguo Zhou
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Kewei Huang
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Mengxiao Yu
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Fuyou Li
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Tao Yi
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Chunhui Huang
- Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
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150
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Lin CC, Jay JA. Mercury methylation by planktonic and biofilm cultures of Desulfovibrio desulfuricans. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2007; 41:6691-6697. [PMID: 17969682 DOI: 10.1021/es062304c] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
While biofilms are now known to be the predominant form of microbial growth in nature, very little is yet known about their role in environmental mercury (Hg) methylation. Findings of Hg methylation in periphyton communities have indicated the importance of investigating how environmental biofilms affect Hg methylation, as periphyton can be the base of the food webs in aquatic ecosystems. Chemical speciation influences the microbial uptake and methylation of inorganic Hg by planktonic cultures of sulfate-reducing bacteria; however, the effect of speciation on Hg methylation by biofilm cultures of these organisms has previously not been studied. In the present study, Hg methylation rates in biofilm and planktonic cultures of two isolates of Desulfovibrio desulfuricans from a coastal wetland were compared. Notably, the specific Hg methylation rate found was approximately an order of magnitude higher (0.0018 vs. 0.0002 attomol cell(-1) day(-1)) in biofilm cells than in planktonic cells, suggesting an important role for environmental biofilms in Hg methylation. To investigate the role of chemical speciation of Hg, experiments were conducted at two levels of sulfide. Both biofilm and planktonic cultures produced methylmercury at roughly twice the rate at low sulfide, when HgS(0)(aq), rather than HgHS2-, was the dominant Hg species. This indicates that the presence of a biofilm does not alter the relative availability of the dominant Hg species in sulfidic medium, in accordance with our previous studies of Hg uptake by Escherichia coli along a chloride gradient.
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Affiliation(s)
- Chu-Ching Lin
- Department of Civil and Environmental Engineering, University of California, Los Angeles, 5732H Boelter Hall, Los Angeles, California 90095, USA
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