Dépôt numérique
RECHERCHER

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

Costa, Siddhartha G.V.A.O.; Nitschke, Marcia; Lépine, François; Déziel, Éric; Contiero, Jonas (2010). Structure, properties and applications of rhamnolipids produced by Pseudomonas aeruginosa L2-1 from cassava wastewater Process Biochemistry , vol. 45 , nº 9. p. 1511-1516. DOI: 10.1016/j.procbio.2010.05.033.

Ce document n'est pas hébergé sur EspaceINRS.

Résumé

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 30mN/m and a critical micelle concentration (CMC) of 30mg/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 (32μg/ml), Micrococcus luteus (32μg/ml) and Staphylococcus aureus (128μg/ml). These results demonstrate that the rhamnolipids produced in CWO can be useful for industrial applications, such as the bioremediation of oil spills.

Type de document:
Mots-clés libres: Cassava wastewater, Oil removal, Pseudomonas aeruginosa, Rhamnolipids, Tensioactive properties
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 30 avr. 2014 18:48
Dernière modification: 30 avr. 2014 18:48
URI: http://espace.inrs.ca/id/eprint/2212

Actions (Identification requise)

Modifier la notice Modifier la notice