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

    Year: 2018

    Journal: Colloid Interfac., Volume 2, DEC

    Authors: Maia, Patricia C. V. S.; Santos, Vanessa P.; Fereira, Adriana S.; Luna, Marcos A. C.; Silva, Thayse A. L.; Andrade, Rosileide F. S.; Campos-Takaki, Galba M.

    Organizations: CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [311373/2014-3]; FACEPE (Fundacao de Amparo a Ciencia e Tecnologia de Pernambuco) [APQ-0291-2.12/15]; CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior): PNPD fellowship

    Keywords: Bacillus subtilis; bioemulsifier; cassava wastewater; removal pollutant; methylene blue dye

    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 degrees 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 degrees C), and NaCl concentrations, a dispersion oil displacement area (ODA) test of 55.83 cm(2), 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.
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