A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56
In this work, the environmental compatibility of a biosurfactant produced by a Bacillus subtilis strain isolated from the soil of a Brazilian mangrove was investigated. The biosurfactant, identified as surfactin, is able to reduce surface tension (ST) to 31.5 ± 0.1 mN m−1 and exhibits a lowcritical micelle concentration (CMC) value (0.015 ± 0.003 g L−1). The highest crude biosurfactant concentration (224.3 ± 1.9 mg L−1) was reached at 72 h of fermentation. Acute toxicity tests, carried out with Daphnia magna, Vibrio fischeri and Selenastrum capricornutum indicated that the toxicity of the biosurfactant is lower than that of its chemically derived counterparts. The results of the biodegradability tests demonstrated that the crude surfactin extract was degraded by both Pseudomonas putida and a mixed population from a sewage-treatment plant, in both cases the biodegradation efficiency being dependent on the initial concentration of the biosurfactant. Finally, as the biodegradation percentages obtained fall within the acceptance limits established by the Organization for Economic Co-operation and Development (Guidelines for Testing of Chemicals, OECD 301E), crude surfactin can be classified as a “readily” biodegradable compound.
Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56
In this work, the environmental compatibility of a biosurfactant produced by a Bacillus subtilis strain isolated from the soil of a Brazilian mangrove was investigated. The biosurfactant, identified as surfactin, is able to reduce surface tension (ST) to 31.5 ± 0.1 mN m−1 and exhibits a lowcritical micelle concentration (CMC) value (0.015 ± 0.003 g L−1). The highest crude biosurfactant concentration (224.3 ± 1.9 mg L−1) was reached at 72 h of fermentation. Acute toxicity tests, carried out with Daphnia magna, Vibrio fischeri and Selenastrum capricornutum indicated that the toxicity of the biosurfactant is lower than that of its chemically derived counterparts. The results of the biodegradability tests demonstrated that the crude surfactin extract was degraded by both Pseudomonas putida and a mixed population from a sewage-treatment plant, in both cases the biodegradation efficiency being dependent on the initial concentration of the biosurfactant. Finally, as the biodegradation percentages obtained fall within the acceptance limits established by the Organization for Economic Co-operation and Development (Guidelines for Testing of Chemicals, OECD 301E), crude surfactin can be classified as a “readily” biodegradable compound.
Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56
De Oliveira, Darlane W. F. (author) / Cara, Alejandro B. (author) / Lechuga-Villena, Manuela (author) / García-Román, Miguel (author) / Melo, Vania M. M. (author) / Gonçalves, Luciana R. B. (author) / Vaz, Deisi A. (author)
Journal of Environmental Science and Health, Part A ; 52 ; 174-181
2017-01-28
8 pages
Article (Journal)
Electronic Resource
English
Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56
| Online Contents | 2017
Aquatic toxicity and biodegradability of a surfactant produced by Bacillus subtilis ICA56
| Online Contents | 2016
| Taylor & Francis Verlag | 2010