The toxicity of textile reactive azo dyes after hydrolysis and decolourisation

Gottlieb, Anna; Shaw, Chris; Smith, Alan M.; Wheatley, Andrew D.; Forsythe, Stephen

doi:10.1016/s0168-1656(02)00302-4

Cited by 369 publications

(190 citation statements)

References 10 publications

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“…From the plot (Figure 5), it can be seen that though the percentage of decolorization increases with the initial dye concentrations and it reaches the maximum of 90 percentage of decolorization at 100 mg/l of initial concentration. There is a decrease in the percentage of decolorization for initial dye concentrations above 100mg/l, and it is mainly due to substrate inhibition.. (Al-Sabti, 2000, Chen, 2002, Gottlieb et al, 2003, Marlasca et al, 1998, Rosa et al, 2001, Walthall & Stark, 1999, Yesilada et al, 2003, Yun & Qi-xing, 2002.…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Decolorization of Cibacron Yellow S-3R Using Coriolus Versicolor (MTCC 138)

Venkatachalam¹,

Venkatachalam²

2008

MAS

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The aim of the present study is to analyze the ability of the white rot fungi Coriolus Versicolor (MTCC 138) in the decolorization of Cibacron Yellow S-3R, a recalcitrant azo reactive textile dye. The influencing parameters that affect the percentage of decolorization rates are optimized in batch mode. The optimal values of the parameters such as mycelia age, temperature, pH, initial dye concentration and carbon source concentration are found to be 7 days, 30°C, 5.4, 100 mg/l and 2 mg/l respectively. The maximum percentage of decolorization at the optimized conditions is found to be 90%. It is also conferred that there is substrate inhibition to fungal decolorization when initial dye concentration is greater than 100 mg/l.

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Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Decolorization of Cibacron Yellow S-3R Using Coriolus Versicolor (MTCC 138)

Venkatachalam¹,

Venkatachalam²

2008

MAS

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“…However, laccases produced by Streptomyces are reported to be effective for the decolorization of textile dyes (Dube et al, 2008;Lu et al, 2013;Molina-Guijarro et al, 2009). Gottlieb et al (2003) demonstrated the usefulness of a laccase enzyme produced by Streptomyces cyaneus CECT 3335. Redox mediators play an important role in oxidative degradation by Streptomyces laccases, primarily by facilitating the movement of electrons in the system (Gonzalez et al, 2009).…”

Section: Oxidative Enzymesmentioning

confidence: 99%

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Ibekwe

Yang

et al. 2016

Science of The Total Environment

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Azo dyes and their intermediate degradation products are common contaminants of soil and groundwater in developing countries where textile and leather dye products are produced. The toxicity of azo dyes is primarily associated with their molecular structure, substitution groups and reactivity. To avoid contamination of natural resources and to minimize risk to human health, this wastewater requires treatment in an environmentally safe manner. This manuscript critically reviews biological treatment systems and the role of bacterial reductive and oxidative enzymes/processes in the bioremediation of dye-polluted wastewaters. Many studies have shown that a variety of culturable bacteria have efficient enzymatic systems that can carry out complete mineralization of dye chemicals and their metabolites (aromatic compounds) over a wide range of environmental conditions. Complete mineralization of azo dyes generally involves a two-step process requiring initial anaerobic treatment for decolorization, followed by an oxidative process that results in degradation of the toxic intermediates that are formed during the first step. Molecular studies have revealed that the first reductive process can be carried out by two classes of enzymes involving flavin-dependent and flavin-free azoreductases under anaerobic or low oxygen conditions. The second step that is carried out by oxidative enzymes that primarily involves broad specificity peroxidases, laccases and tyrosinases. This review focuses, in particular, on the characterization of these enzymes with respect to their enzyme kinetics and the environmental conditions that are necessary for bioreactor systems to treat azo dyes contained in wastewater.

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“…Sodium dithionite is known mildy hazardous chemical and toxic effect of Na 2 S 2 O 4 and its derivates for wastewater and ecology were reported by Božic and Kokol (2008). Gottlieb et al (2003) studied toxicity of some textile dyes using sodium dithionite as a reducing agent. Güloglu et al (2004) studied the effects of SO 2 released through air because of the harmful mixture of a sodium hydrosulphite of a sodium hydrosulphite on textile workers and they reported that the effects of SO 2 gases were depended on the intensity and the time of duration.…”

Section: Chromosome Aberration (Ca) Testmentioning

confidence: 99%

The role of natural indigo dye in alleviation of genotoxicity of sodium dithionite as a reducing agent

et al. 2016

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Indigo blue is a natural dye used for thousands of years by civilizations to dye fabric blue and it is naturally obtained from Isatis tinctoria. I. tinctoria is not only used for extraction of indigo blue color but also used medicinally in Traditional Chinese Medicine because of its active compounds. Sodium dithionite (Na 2 S 2 O 4 ) is used in dye bath for indigo blue extraction, but this reducing agent and its derivatives are major pollutants of textile industry and subsequently have hazardous influences on public health. Herein, the present study was designed to obtain the high yield of natural indigo dye but with low possible toxic effect. In this context, genotoxic effects of particular combinations of natural dye solutions obtained from Isatis tinctoria subsp. tomentolla with Na 2 S 2 O 4 as reducing agent were investigated. Dye solutions were obtained using two different pH levels (pH 9 and 11) and three different concentrations of Na 2 S 2 O 4 (2.5, 5 and 10 mg/ml). In addition to the dye solutions and reducing agent, aqueous extracts of I. tinctoria were assessed for their genotoxicity on human lymphocytes. For in vitro testing of genotoxicity, chromosomal aberrations (CAs), sister chromatid exchanges (SCEs) and mitotic indexes (MI) assays were used. Accordingly, Na 2 S 2 O 4 caused significant increases in CA and SCE as well decrease in MI but the genotoxic effects of sodium dithionite were reduced with natural indigo dye. As a result, aqueous extracts of Isatis leaves removed the toxic effects of sodium dithionite and showed anti-genotoxic effect. For the optimal and desired quality but with less toxic effects of natural dye, 2.5 mg/ml (for wool yarn) and 5 mg/ml (for cotton yarn) of Na 2 S 2 O 4 doses were found to be the best doses for reduction in the dye bath at Ph 9.

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The toxicity of textile reactive azo dyes after hydrolysis and decolourisation

Cited by 369 publications

References 10 publications

Decolorization of Cibacron Yellow S-3R Using Coriolus Versicolor (MTCC 138)

Decolorization of Cibacron Yellow S-3R Using Coriolus Versicolor (MTCC 138)

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

The role of natural indigo dye in alleviation of genotoxicity of sodium dithionite as a reducing agent

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