title: Oil wastes as unconventional substrates for rhamnolipid biosurfactant production by Pseudomonas aeruginosa LBI.
abstract: Oil wastes were evaluated as alternative low-cost substrates for the production of rhamnolipids by Pseudomonas aeruginosa LBI strain. Wastes obtained from soybean, cottonseed, babassu, palm, and corn oil refinery were tested. The soybean soapstock waste was the best substrate, generating 11.7 g/L of rhamnolipids with a surface tension of 26.9 mN/m, a critical micelle concentration of 51.5 mg/L, and a production yield of 75%. The monorhamnolipid RhaC(10)C(10) predominates when P. aeruginosa LBI was cultivated on hydrophobic substrates, whereas hydrophilic carbon sources form the dirhamnolipid Rha(2)C(10)C(10) predominantly.
authors.affiliation: Department of Biochemistry and Microbiology, Institute of Biological Sciences, São Paulo State University, UNESP/ Rio Claro, Av. 24-A, 1515 Bela Vista CEP 13506-900, Caixa Postal 199, Rio Claro SP, Brazil. nitschke@rc.unesp.br
authors.forename: Marcia
authors.initials: M
authors.lastname: Nitschke
authors.forename: Siddhartha G V A O
authors.initials: SG
authors.lastname: Costa
authors.forename: Renato
authors.initials: R
authors.lastname: Haddad
authors.forename: Lireny A G
authors.initials: LA
authors.lastname: Gonçalves
authors.forename: Marcos N
authors.initials: MN
authors.lastname: Eberlin
authors.forename: Jonas
authors.initials: J
authors.lastname: Contiero
mesh_terms: D001711:Biotransformation; D006017:Glycolipids / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D007220:Industrial Waste / Q000517:prevention & control*; D010938:Plant Oils / Q000378:metabolism*; D011550:Pseudomonas aeruginosa / Q000378:metabolism*; D013501:Surface-Active Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D006017:Glycolipids; D007220:Industrial Waste; D010938:Plant Oils; D013501:Surface-Active Agents; C418382:rhamnolipid