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Assessment of toxicity of a biosurfactant from Candida sphaerica UCP 0995 cultivated with industrial residues in a bioreactor

2013; Elsevier BV; Volume: 16; Issue: 4 Linguagem: Inglês

10.2225/vol16-issue4-fulltext-4

0717-3458

Leonie Asfora Sarubbo, Humberto Bezerra Souza Sobrinho, Juliana M. Luna, Raquel D. Rufino, Ana Lúcia Figueiredo Porto,

Carcinogens and Genotoxicity Assessment

Background:The aim of the present study was to propose a low-cost method for the production of a biosurfactant by the yeast Candida sphaerica and assess its toxicity and phytotoxicity.The medium was formulated with distilled water supplemented with residue from a soy oil refinery (5%) and corn steep liquor (2.5%) as substrates.These two products were the sources of carbon and nitrogen as well as mineral elements to encourage the growth of the microorganism and production of a biosurfactant.Results: The isolated biosurfactant yield was 6.364 g/l.The biosurfactant exhibited an excellent ability to reduce surface tension (26 mN/m) and demonstrated no toxicity against seeds of Brassica oleracea, Chicoria intybus and Solanum gilo or the micro crustacean Artemia salina employed as a bioindicator.The biosurfactant exhibited no antimicrobial activity against the fungi and bacteria tested.Conclusions: The promising results obtained in this study indicate the feasibility of producing biosurfactants from powerful non-toxic organic residues and their application in the bioremediation of contaminated soil and water.