Abstract
Rhamnolipid biosurfactants are attracting attention due to their low toxicity, high biodegradability, and good ecological acceptability. However, production in submerged culture is made difficult by severe foaming problems. Solid-state cultivation (SSC) is a promising alternative production method. In the current work, we report the optimization of rhamnolipid production by Pseudomonas aeruginosa UFPEDA 614 on a solid substrate containing sugarcane bagasse and corn bran. The best rhamnolipid production, 45 g/l of impregnating solution used, was obtained with a 50:50 (m/m) mixture of sugarcane bagasse and corn bran supplemented with an impregnating solution containing 6% (v/v) of each of glycerol and soybean oil. This level is comparable with those of previous studies undertaken in solid-state cultivation; the composition of the biosurfactant is similar, but our medium is cheaper. Our work therefore provides a suitable basis for future studies of the development of an SSC-based process for rhamnolipid production.
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Acknowledgements
This work was supported financially by Corn Products Brasil and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil), a Brazilian government agency for the advancement of science and technology. Research scholarships were granted to David Mitchell, Nadia Krieger, Arquimedes Paixão de Santana-Filho, Guilherme L. Sassaki, and Lauro M. de Souza by CNPq, to Doumit Camilios-Neto by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil), and to Cryshelen Bugay and Talita Joslin by Corn Products Brasil.
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Camilios-Neto, D., Bugay, C., de Santana-Filho, A.P. et al. Production of rhamnolipids in solid-state cultivation using a mixture of sugarcane bagasse and corn bran supplemented with glycerol and soybean oil. Appl Microbiol Biotechnol 89, 1395–1403 (2011). https://doi.org/10.1007/s00253-010-2987-3
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DOI: https://doi.org/10.1007/s00253-010-2987-3