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Open AccessArticle

An Efficient Bioemulsifier-Producing Bacillus subtilis UCP 0146 Isolated from Mangrove Sediments

1
Development of Environmental Processes Post-Graduation Program, Catholic University of Pernambuco, Recife 50050-900, Brazil
2
Doctorate Northeast Network for Biotechnology, Federal Rural University of Pernambuco, Recife 52171-900, Brazil
3
National Post-Doctorate Program-CAPES, Catholic University of Pernambuco, Recife 50050-900, Brazil
4
Nucleus of Research in Environmental Sciences and Biotechnology, Catholic University of Pernambuco, Recife 50050-590, Brazil
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2018, 2(4), 58; https://doi.org/10.3390/colloids2040058
Received: 1 September 2018 / Revised: 24 October 2018 / Accepted: 6 November 2018 / Published: 13 November 2018
(This article belongs to the Special Issue Biosurfactants: Trends and Applications)
In this work, we investigated the potential of Bacillus subtilis UCP 0146 in the bioconversion of a medium containing 100% cassava flour wastewater to obtain a bioemulsifier. The evaluation of the production was carried out by the emulsification index (IE24) and the surface tension (ST). The ionic charge, stability (temperature, salinity, and pH measured by IE24 and viscosity), and ability to remove and disperse oil and textile dye were investigated. B. subtilis produced an anionic bioemulsifier in the medium containing 100% cassava wastewater under Condition 4 of the factorial design (inoculum 9% at a temperature of 35 °C and shaken at 100 rpm), and showed a surface tension of 39 mN/m, an IE24 of 95.2%, and a yield of 2.69 g·L−1. The bioemulsifier showed stability at different pH (2–8), temperatures (0–120 °C), and NaCl concentrations, a dispersion oil displacement area (ODA) test of 55.83 cm2, and a reduction of the viscosity of the burned engine oil (90.5 Cp). The bioemulsifier was able to remove petroleum (94.4%) and methylene blue azo dye (62.2%). The bioemulsifier and its synthesis from bacteria also emphasizes the role of surfactants in oil remediation. View Full-Text
Keywords: Bacillus subtilis; bioemulsifier; cassava wastewater; removal pollutant; methylene blue dye Bacillus subtilis; bioemulsifier; cassava wastewater; removal pollutant; methylene blue dye
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Maia, P.C.V.S.; Santos, V.P.; Fereira, A.S.; Luna, M.A.C.; Silva, T.A.L.; Andrade, R.F.S.; Campos-Takaki, G.M. An Efficient Bioemulsifier-Producing Bacillus subtilis UCP 0146 Isolated from Mangrove Sediments. Colloids Interfaces 2018, 2, 58.

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