ASSESSMENT OF TOXICITY OF AZO DYES BY Allium cepa AND STUDY OF CAPACITY AT REMOVING THESE COMPOUNDS IN INDUSTRIAL EFFLUENTS BY Saccharomyces cerevisiae

• Grant number: 09/07996-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2009
• End date: November 30, 2010
• Field of knowledge: Biological Sciences - Microbiology - Applied Microbiology
• Principal Investigator: Carlos Renato Corso
• Grantee: Érica Janaina Rodrigues de Almeida
• Host Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

The production of toxic chemicals by industries is one of the most important issues in pollution control. Among these substances are used in textile processing, which are variety, size and color. It is estimated that approximately 15% of world production of synthetic dyes are lost to the environment during its synthesis, processing or application. Besides the environmental pollution that these dyes cause, another concern is the effect that these substances released into the environment can bring to human health because they are often mutagenic or carcinogenic. There is therefore a need to find methods that will help to remove these pollutants from the environment. Considering that the objective of this problem work will evaluate the toxicity of textile dyes Crisoidina, Direct Violet 51 and Acid Orange 7. For this test will be used as body bulbs of Allium cepa, where the toxicity is determined from the analysis of growth of the roots of the bulbs that will be directly in contact with solutions of dyes. Biosorption and degradation processes, using the yeast Saccharomyces cerevisiae also be performed. The process will be conducted with the biosorption order to remove the molecules of dye that they suffer no degradation thus reducing toxicity if it exists. The process of biodegradation will be conducted with the objective of reduce the toxicity of the medium. And here is another study conducted with the objective of determine the toxicity of products formed by the breakdown of the dye molecules, which in can often be more toxic than the molecule of dye.