Copper Chelating
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Study of the CuII Affinity by Three Chelating Agents of Biological Interest: TPEN, TRIEN and Et2DTC
Copper is an important micronutrient, and it is present in some protein structures, as well as participate in several important biological processes. Due to its importance, some ligands are used and studied like carriers of copper in the biological systems. This work has investigated the affinity of CuII by three ligands of biological interest: N, N, N, N’
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. Phenolic profile and antioxidant activity from peels and seeds of melon (Cucumis melo L. var. reticulatus) and their antiproliferative effect in cancer cells
Melon (Cucumis melo L.) has high economic value and in recent years, its production has increased; however, part of the fruit is wasted. Usually, inedible parts such as peel and seeds are discarded during processing and consumption. Extracts of melon residues were prepared and their phenolic compounds, antioxidants and antiproliferative activities were evalu
Braz J Med Biol Res. Publicado em: 01/03/2018
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3. Nonanoic Acid-Coated Magnetite Nanoparticles for Separation and Preconcentration of Lead and Copper in Tobacco Samples prior to Flame Atomic Absorption Spectrometry Determination
A new method using nonanoic acid-coated magnetic Fe3O4 nanoparticles as adsorbent has been developed for the single-step extraction and preconcentration of lead and copper in tobacco samples. Transmission electron microscopy and X-ray diffraction spectrometry were used to characterize the adsorbent. The experimental parameters affecting extraction efficiency
J. Braz. Chem. Soc.. Publicado em: 2018-01
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4. A reliable method of quantification of trace copper in beverages with and without alcohol by spectrophotometry after cloud point extraction
A new cloud point extraction (CPE) method was developed for the separation and preconcentration of copper (II) prior to spectrophotometric analysis. For this purpose, 1-(2,4-dimethylphenyl) azonapthalen-2-ol (Sudan II) was used as a chelating agent and the solution pH was adjusted to 10.0 with borate buffer. Polyethylene glycol tert-octylphenyl ether (Triton
Quím. Nova. Publicado em: 2013
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5. Efeitos de peptídeos quelantes de cobre derivados da cadeia octarepetida da PrPc na viabilidade celular / Effects of copper-chelating peptides derived from chain octarepeated of PrPc on cell viability
A proteína príon celular (PrPc) é uma proteína presente em todas as membranas celulares, altamente expressa em células do sistema nervoso, mas a sua função biológica não está bem elucidada. Sua estrutura contém cerca de231 resíduos de aminoácidos, e na região 51 a 91 há um domínio (octarepetido) onde existem sítios de ligação para metais c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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6. Removal of copper(II) from sugar-cane spirits employing chitosan
A method employing chitosan as complexant agent in the removal of copper(II) ions generally present in the Brazilian cachaça samples is herein proposed. The efficiency of this method is attributed to its high capacity of metal cations adsorption, mainly due to presence of hydroxyl and amine groups that can serve as chelating sites. The removal of copper(II)
Química Nova. Publicado em: 2010
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7. Mecanismo de ação da microplusina, um peptídeo quelante de cobre com atividade antimicrobiana. / Action mechanism of microplusin, a copper chelating peptide with antimicrobial activity.
Antimicrobial peptides (AMPs) take part of innate immune mechanisms against infections. Microplusin is a 10,204 Da AMP, isolated from cell-free hemolymph and eggs of the tick Rhipicephalus (Boophilus) microplus. It is an anionic AMP at physiological pH, with six cysteine residues forming three disulfide bridges and seven histidine residues clustered mainly a
Publicado em: 2008
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8. Competitive adsorption of copper and mercury ions on natural and crosslinked chitosan membranes / Adsorção competitiva dos ions cobre e mercurio em membranas de quitosana natural e reticulada
Recent investigations have described chitosan, a linear polysaccharide obtained from deacetylation of chitin, as a suitable biopolymer to remove heavy metal ions from wastewater, since the amino and hydroxyl groups present in its structure can act as chelating sites. Several methods have been used to modify natural chitosan, such as crosslinking with glutara
Publicado em: 2008
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9. Mecanismos de ação de antioxidantes de origem vegetal : estudo do polifenol ácido elágico e do extrato de caqui (Diospyros kaki)
The present work was divided in 2 chapters. In the first chapter, we investigated the antioxidant mechanism of ellagic acid (EA) to prevent oxyradical formation in a system containing Cu(II) plus ascorbate. The antioxidant property of persimmon pulp in oxidative processes mediated by Fe(III) in vitro was studied in the second chapter. EA study demonstrated t
Publicado em: 2008
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10. Cupriuresis in parents of patients with Wilson disease before and after oral intake of d-penicillamine / Cuprúria em pais de pacientes com doença de Wilson antes e depois da administração oral de d-penicilamina
Wilson disease is a biliary copper excretion disturbance, of recessive autossomic heritage, due to ATP7B gene mutations. The copper not bound to apoceruloplasmin circulates in the organism bound to amino acids and accumulates mainly in the liver and brain being excreted by the kidneys. Urinary copper higher than 100ug/24h can be useful in the diagnosis, but
Publicado em: 2007
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11. Aplicação e modificação química da sílica gel obtida de areia
The silica gel was obtained from sand and its surface was modified with POCl3 to produce Si-Cl bonds on the silica surface. Ethylenediamine was covalently bonded onto the chlorinated silica surface. The adsorption of the chlorides of divalent cobalt, nickel and copper was qualitatively studied to show that the bonding of ethylenediamine onto the silica gel s
Química Nova. Publicado em: 2005-06
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12. Borohidreto complexos de cobre (I) contendo difosfinas: caracterização espectroscópica e comportamento térmico
Tetrahydroborate complexes of copper (I) with bidentate phosphines, [Cu(eta²-BH4)(dppm)] (1), [Cu(eta²-BH4)(dppe)] (2), [Cu(eta²-BH4)(cis-dppet)] (3) and [Cu(eta²-BH4)(dppb)] (4) (dppm = bis(diphenylphosphino)methane; dppe = 1,2-bis(diphenylphosphino) ethane; cis-dppet = 1,2-cis(diphenylphosphino)ethene; dppb = 1,4-bis(diphenylphosphino)butane) were prep
Química Nova. Publicado em: 2001-12