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Structure, properties and applications of rhamnolipids produced by Pseudomonas aeruginosa L2-1 from cassava wastewater

Abstract : The properties and applications of rhamnolipid surfactants produced by Pseudomonas aeruginosa L2-1 from cassava wastewater added with waste cooking oil (CWO) as low-cost substrate, were investigated and compared with the commercial rhamnolipid mixture JBR599 (Jeneil Biosurfactant Co., Saukville, USA). The rhamnolipids produced by strain L2-1 were characterized by high performance liquid chromatography-mass spectrometry. Sixteen different rhamnolipid congeners were detected, with Rha-C10-C10 and Rha-Rha-C10-C10 being the most abundant. The L2-1 rhamnolipids from CWO showed similar or better tensioactive properties than those from JBR599, with a minimal surface tension of 30 mN/m and a critical micelle concentration (CMC) of 30 mg/l. The L2-1 biosurfactants formed stable emulsions with several hydrocarbons and showed excellent emulsification of soybean oil (100%). These rhamnolipids removed 69% of crude oil present in contaminated sand samples at the CMC and presented antimicrobial activity against Bacillus cereus (32 μg/ml), Micrococcus luteus (32 μg/ml) and Staphylococcus aureus (128 μg/ml). These results demonstrate that the rhamnolipids produced in CWO can be useful for industrial applications, such as the bioremediation of oil spills.
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Submitted on : Wednesday, May 1, 2013 - 11:26:33 PM
Last modification on : Friday, December 3, 2021 - 5:32:01 PM

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Siddhartha G.V.A.O. Costa, Marcia Nitschke, Francois Lépine, Eric Déziel, Jonas Contiero. Structure, properties and applications of rhamnolipids produced by Pseudomonas aeruginosa L2-1 from cassava wastewater. Process Biochemistry, Elsevier, 2010, 45 (9), pp.1511-1516. ⟨10.1016/j.procbio.2010.05.033⟩. ⟨pasteur-00819599⟩

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