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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 16, No. 4, 2014
Bioline Code: ej13040
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 16, No. 4, 2014

 en Assessment of toxicity of a biosurfactant from Candida sphaerica check for this species in other resources UCP 0995 cultivated with industrial residues in a bioreactor
de Souza Sobrinho, Humberto Bezerra; de Luna, Juliana Moura; Rufino, Raquel Diniz; Porto, Ana Lúcia Figueiredo & Sarubbo, Leonie Asfora


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 check for this species in other resources 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 check for this species in other resources , Chicoria intybus check for this species in other resources and Solanum gilo check for this species in other resources or the micro crustacean Artemia salina check for this species in other resources 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.

biosurfactant; bioreactor; Candida sphaerica; industrial residues; toxicity

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