Azo Dyes
Mostrando 1-12 de 92 artigos, teses e dissertações.
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1. Effect of erythrosine and phloxine from xanthene food dyes on oxidative stress in Chinese hamster ovary cells
Abstract Objective of this study was to investigate the changes of oxidative stress parameters in Chinese hamster ovary (CHO) cells exposed to xanthene food dyes (erythrosine and phloxine), commonly-used azo dyes in the food industry. For this purpose, glutathione (GSH) and malondialdehyde (MDA) levels, glutathione peroxidase (GPx) and catalase (CAT) activit
Food Sci. Technol. Publicado em: 2020-12
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2. Effect of erythrosine and phloxine from xanthene food dyes on oxidative stress in Chinese hamster ovary cells
Abstract Objective of this study was to investigate the changes of oxidative stress parameters in Chinese hamster ovary (CHO) cells exposed to xanthene food dyes (erythrosine and phloxine), commonly-used azo dyes in the food industry. For this purpose, glutathione (GSH) and malondialdehyde (MDA) levels, glutathione peroxidase (GPx) and catalase (CAT) activit
Food Sci. Technol. Publicado em: 20/12/2019
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3. Decolorization of textile azo dye Reactive Red 239 by the novel strain Shewanella xiamenensis G5-03 isolated from contaminated soil
Resumo Shewanella xiamenensis G5-03 isolada de solo contaminado de aterro sanitário foi eficiente em descolorir cinco corantes têxteis azos em condições estáticas. Um deles, Reactive Red 239 (RR239), foi completamente descolorido na faixa de pH de 7 a 11 (a 35°C) dentro de 3-6 h. A bactéria também foi eficiente em descolorir RR239 em uma ampla faixa
Rev. Ambient. Água. Publicado em: 28/11/2019
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4. Hydrogen Peroxide Electrogeneration by Gas Diffusion Electrode Modified With Tungsten Oxide Nanoparticles for Degradation of Orange II and Sunset Yellow FCF Azo Dyes
In this work, the gas diffusion electrode (GDE) cathode of Vulcan XC72 carbon modified with nanoparticles of WO2.72 (WO2.72 / Vulcan XC72) was used for H2O2 electrogeneration and degradation of 350 mL of Orange II (OII) and Sunset Yellow FCF (SY) azo dyes by electro-Fenton (EF) and photoelectro-Fenton (PEF) processes with different Fe2+ initial content (1.00
J. Braz. Chem. Soc.. Publicado em: 16/09/2019
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5. Effects of pH, Temperature and Agitation on the Decolourisation of Dyes by Laccase-Containing Enzyme Preparation from Pleurotus sajor-caju
(1) Background: In this study, the effects of different pH values (2.4, 3.2, 4.4 and 5.0), temperatures (30, 35, 40, 45 and 50°C) and agitation (100 rpm) on the enzymatic decolourisation of twenty-two dyes belonging to the chromophore groups anthraquinone, azo and triphenylmethane were assessed. (2) Methods: In all conditions, it was used a crude enzyme bro
Braz. arch. biol. technol.. Publicado em: 13/06/2019
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6. Efficiency of decolorization of different dyes using fungal biomass immobilized on different solid supports
Abstract Different technologies may be used for decolorization of wastewater containing dyes. Among them, biological processes are the most promising because they seem to be environmentally safe. The aim of this study was to determine the efficiency of decolorization of two dyes belonging to different classes (azo and triphenylmethane dyes) by immobilized bi
Braz. J. Microbiol.. Publicado em: 2018-06
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7. Magnetic Solid-Phase Extraction Combined with Dispersive Liquid-Liquid Microextraction Followed by HPLC for Determination of Four Aromatic Amines Released from Azo Dyes in Paper Samples
A novel extraction technique combining dispersive liquid-liquid microextraction (DLLME) with magnetic solid-phase extraction (MSPE) is presented for pre-concentration of four primary aromatic amines (PAAs) released from azo dyes in paper samples prior to high performance liquid chromatography (HPLC). n-Octanol was used as the extractant and hydrophobic oleic
J. Braz. Chem. Soc.. Publicado em: 2018-04
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8. KINETIC BEHAVIOR OF SOME AZO DYES DECOLORIZATION BY VARIATION OF ZINC OXIDE AND TITANIUM DIOXIDE CONCENTRATIONS
The decolorization of three monoazo dyes (acid orange 7, direct orange 34, and methyl orange), one diazo dye (direct yellow 86) and one tetraazo dye (direct red 80) were mediated by n-type semiconductors as ZnO and TiO2 under pseudo-first order conditions at 30 ºC. The decolorization rate constants of these azo dyes were determined, varying the semiconducto
Quím. Nova. Publicado em: 2018-03
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9. OXIDAÇÃO ELETROQUÍMICA DOS CORANTES REATIVOS PRETO 5 E AZUL 19 UTILIZANDO UM ELETRODO DE DIAMANTE DOPADO COM BORO NÃO COMERCIAL
We have studied the treatment of Reactive Black 5 (RP5) and Blue 19 (RA19), which are respectively azo and anthraquinone textile dyes, by electrochemical oxidation using a non commercial boron doped diamond electrode supported on titanium metallic with a relation between B and C equal to 15,000 ppm. Pt was used as counter electrode and Ag/AgCl(sat) was the r
Quím. Nova. Publicado em: 2016-11
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10. Application of a Novel Micro-Cloud Point Extraction for Preconcentration and Spectrophotometric Determination of Azo Dyes
A novel room temperature micro-cloud point extraction procedure using triton X-114 surfactant as extracting phase was developed for preconcentration and extraction of three azo dyes (orange G, methyl orange, and acid red 18) from aqueous samples using molecular absorption spectrophotometry in the visible region. The effects of different parameters such as co
J. Braz. Chem. Soc.. Publicado em: 2016-09
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11. Decolorization of azo dyes (Direct Blue 151 and Direct Red 31) by moderately alkaliphilic bacterial consortium
Abstract Removal of synthetic dyes is one of the main challenges before releasing the wastes discharged by textile industries. Biodegradation of azo dyes by alkaliphilic bacterial consortium is one of the environmental-friendly methods used for the removal of dyes from textile effluents. Hence, this study presents isolation of a bacterial consortium from soi
Braz. J. Microbiol.. Publicado em: 2016-03
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12. Dye Degradation Enhanced by Coupling Electrochemical Process and Heterogeneous Photocatalysis
In this study, we evaluated the combination between an electrochemical process, occurring in the dark, and a heterogeneous photocatalytic process for dye degradation, using the azo dye tartrazine as model of oxidizable substrate. TiO2 P25 and an Ag-doped TiO2 were used as photocatalysts in suspensions containing 50 mg L–1 of tartrazine. The best result, 74
J. Braz. Chem. Soc.. Publicado em: 2015-09