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Preliminary evaluation of decolourisation of Procion and Everdirect dyes by yeasts
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Introduction: Environmental pollution is one of the most important problems of actuality. The textile sector is a large and worldwide business and the most important in many countries. However, besides the high economic value that generates, it produces high volumes of effluents due to the large quantities of water used in fabric processing. This causes an enormous environmental problem concerning the contamination of water from rivers due to the discharge of effluents containing a wide range of dyes. These dyes are persistent in water, resistant to biodegradation, interfere with photosynthesis processes and are responsible for toxicity, carcinogenic and mutagenic effects to the aquatic life. The aim of this work was to evaluate the ability of selected yeast strains to decolourise specific dyes frequently used in the textile industry. Methods: Previously selected yeasts were tested to their ability to decolourise dyes commonly used in textile industries. Reactive dyes Red Procion HE 4R, Yellow Procion H, Navy Procion HEXL and direct dye Yellow Everdirect Supra RL, commonly used in cotton fibers, were selected for this work. Selected yeasts strains named 1a., 1b. and 1c. were cultivated in NDM liquid medium supplemented with 100 mg/L of each dye, in a 24 well microplate that was incubated at 25 ºC for 48 h and 100 rpm. Decolourisation was observed by naked eye. The yeast’s ability to decolourise dyes in a solid medium was also tested using NSDM medium supplemented with 100 mg/L of dye and plates were incubated at 25 ºC for 48 h. Decolourisation halos around colonies were observed as well as the colour of the colonies themselves. Conclusions: Strain 1c. was the only effective yeast strain with regards to the ability to decolourise the dyes tested. In these conditions, strain 1a. and 1b. are only able to absorb the dyes tested. Strain 1c. seems to be the only one that is able to perform true decolourisation.
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Mendes, M., Moreira, P., Castro, P., & Pintado, M. (2017). Preliminary evaluation of decolourisation of Procion and Everdirect dyes by yeasts. 1-1. Poster session presented at Microbiotec’17, Porto, Portugal.
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