Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 19, Issue 2, Pages 159-166Publisher
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/S0104-66322002000200011
Keywords
production of biosurfactants; glycolipids; rhamnolipids; Pseudomonas aeruginosa; surface-active substances
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The potential production of rhamnolipid-type biosurfactants; is assessed based on the development of a fermentative process with a strain of Pseudomonas aeruginosa PA1, which was isolated from oil production wastewater in the Northeast of Brazil. These production of molecules using different carbon (n-hexadecane, paraffinic oil, glycerol and babassu oil) and nitrogen sources (NaNO3, (NH4)(2)SO4 and CH4N2O) was studied. The best results were obtained when using glycerol as substrate. A C/N ratio of 60/1 and use of sodium nitrate as nitrogen source resulted in higher production of the rhamnolipid, expressed by rhamnose (3.16 g/L) and by the yield in relation to biomass (Yp/x = 0.70 g/g). Additionally, physical-chemical characteristics of the spent broth with and without cells were studied, providing a low critical micelle concentration of 19 mg/L and toxicity values of 13 and 13.8 mg/L using two test organisms, the micro crustacean Daphnia similis and the bacterium Vibrio fisheri (Microtox), respectively.
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