The toxicity of commercial surfactants on yeast Saccharomyces cerevisiae

Brajak, Vlatka (2009) The toxicity of commercial surfactants on yeast Saccharomyces cerevisiae. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The goal of this study was to assess toxicity of commercial surfactants as essential parts of detergent, fabric softeners and cleaning products which are used in households. 15 commercial surfactants were analyzed. The toxicity was evaluated by two tests on yeast, S. cervisiae, fermentation test and methylene blue dye test. According to obtained EC50 values sufractants were sorted in three categories of adversity. Three tested sufractants were proven toxic with EC50 values ranking between 1 and 10 mg/L, while six compounds showed very low level of toxicity with EC50 values considerably higher than 100 mg/L. Remaining six samples had been classified as not harmful for the enviroment, as their EC50 values ranked between 10 and 100 mg/L. Methylene blue dye test on yeast S. cervisiae was found to be more sensitive then fermentation test, becouse the estimated EC50 values using methylene blue dye test were mainly lower.

Item Type: Thesis (Diploma thesis)
Keywords: detergent, toxicity tests, S. cervisiae, fermentation, methylene blue, inhibition percentage, effective concentration EC50
Supervisor: Hrenović, Jasna
Date: 2009
Number of Pages: 82
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 11 Sep 2014 11:22
Last Modified: 11 Sep 2014 11:22
URI: http://digre.pmf.unizg.hr/id/eprint/2717

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