Predicting azo dye toxicity

Brown, Mark A.; Vito, Stephen C. De

doi:10.1080/10643389309388453

Cited by 678 publications

(307 citation statements)

References 81 publications

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“…Assim, existe grande possibilidade de que nem o corante ou seus metabólitos mostre potencial bioacumulação. Entretanto, os riscos crônicos destes tipos de corantes e intermediários levam em consideração suas propriedades carcinogênicas e mutagênicas 29,[32][33][34][35][36] . Nesta classe de corantes, o grupo que tem atraído maior atenção tem sido os corantes contendo a função azo-aromático como cromóforo, os quais constituem o maior grupo de corantes orgâ-nicos produzidos mundialmente.…”

Section: Aspectos Toxicológicosunclassified

Corantes têxteis

Guaratini¹,

Zanoni²

2000

Quím. Nova

265

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Recebido em 7/10/98; aceito em 31/3/99 TEXTILE DYES. A dye is a colored substance used to impart permanent color to other substances. Its most important use is in coloring textile fibers and fabrics. The removal of colour from dyehouse waste waters is currently a major problem in the textile sector. This paper provides an overview of the treatment technologies that can currently be used by the textile processor and the developments over the past decade with respect to the toxicological and ecotoxicological properties of synthetic organic dyes.

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Section: Aspectos Toxicológicosunclassified

Corantes têxteis

Guaratini¹,

Zanoni²

2000

Quím. Nova

265

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“…To date, azo dyes have not been found to be toxic to microorganisms (Brown & Devito, 1993). Our results showed a variety of azo dyes (Tartrazine, Methyl Red, Methyl Orange, Ponceau BS, Ponceau S, Trypan Blue and Direct Blue 15) are indeed inhibitory, specifically in BHI and not CMM media (Fig.…”

Section: Discussionmentioning

confidence: 52%

Growth and physiology of Clostridium perfringens wild-type and ΔazoC knockout: an azo dye exposure study

Morrison

John

2016

Microbiology

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Clostridium perfringens, a strictly anaerobic micro-organism and inhabitant of the human intestine, has been shown to produce the azoreductase enzyme AzoC, an NAD(P)H-dependent flavin oxidoreductase. This enzyme reduces azo dyes to aromatic amines, which are carcinogenic in nature. A significant amount of work has been completed that focuses on the activity of this enzyme; however, few studies have been completed that focus on the physiology of azo dye reduction. Dye reduction studies coupled with C. perfringens growth studies in the presence of ten different azo dyes and in media of varying complexities were completed to compare the growth rates and dye-reducing activity of C. perfringens WT cells, a C. perfringens DazoC knockout, and Bifidobacterium infantis, a non-azoreductase-producing control bacterium. The presence of azo dyes significantly increased the generation time of C. perfringens in rich medium, an effect that was not seen in minimal medium. In addition, azo dye reduction studies with the DazoC knockout suggested the presence of additional functional azoreductases in this medically important bacterium. Overall, this study addresses a major gap in the literature by providing the first look, to our knowledge, at the complex physiology of C. perfringens upon azo dye exposure and the effect that both azo dyes and the azoreductase enzyme have on growth.

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“…The presence of dyes in water reduces light penetration and hinders photosynthesis in aquatic plants [3]. Moreover, many of the dyes are reported to have low biodegradability and are highly carcinogenic [4]. It is, therefore, essential to treat the dye effluents before discharging into the receiving water.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Ullah

Kibria

Akter

et al. 2017

Water Conserv Sci Eng

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Mn 3 O 4 nanoparticles were synthesized from one-step reduction of KMnO 4 with glycerol at 80°C. The structural and surface morphological characterizations were carried out using FT-IR, XRD, and FESEM analyses. The elemental composition was evidenced from EDX analysis. XRD analysis showed the tetragonal crystal geometry of Mn 3 O 4 nanoparticles with an average crystallite size of ∼20 nm. The surface morphology of the Mn 3 O 4 nanoparticles was found to be spherical from the FESEM image. The Mn 3 O 4 nanoparticles were then tested as a potential oxidant for the decolorization of methylene blue (MB) and found to be capable of N-demethylation of MB forming thionine as the final product, and removing 80% of the dye in approximately 1 h. The decolorization of MB by Mn 3 O 4 occurred through a surface mechanism, i.e., formation of surface precursor complex between MB and surface-bound Mn (II, III), where, electron transfer occurs within the surface complex. The effect of suspension pH (3-4 < pH pzc ; 5-10 > pH pzc ) on MB decolorization was assessed. Suspension pH exerted double-edged effects on MB decolorization by influencing the formation of surface precursor complex, and reducing potential of the system.

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Predicting azo dye toxicity

Cited by 678 publications

References 81 publications

Corantes têxteis

Corantes têxteis

Growth and physiology of Clostridium perfringens wild-type and ΔazoC knockout: an azo dye exposure study

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

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