Rhamnolipids Production by a Pseudomonas eruginosa LBI Mutant: Solutions and Homologs Characterization

Author:

Lovaglio Roberta B.1,da Silva Vinícius L.1,Capelini Tulio de Lucca1,Eberlin Marcos N.2,Hausmann Rudolf3,Henkel Marius4,Contiero Jonas1

Affiliation:

1. UNESP – Universidade Estadual Paulista , Department of Biochemistry and Microbiology, Institute of Biological Sciences, Av. 24-A, 1515 Bela Vista, CEP 13506-900, Rio Claro, SP , Brazil

2. Thomson Mass Spectrometry Laboratory , Institute of Chemistry, Campinas State University, UNICAMP, Campinas, SP , Brazil

3. Institute of Food Science and Biotechnology (150) , Section Bioprocess Engineering (150k), University of Hohenheim, Garbenstr. 25, 70599 Stuttgart , Germany

4. Institute of Process Engineering in Life Sciences , Section II: Technical Biology, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, 76131 Karlsruhe , Germany

Abstract

Abstract This paper evaluates the effect of additives (NaCl and ethanol) on the solution properties of rhamnolipids. The properties are the surface activity, aggregate formations and emulsifying activity as well as the synergistic effects of additives and pH variations on the physical properties of rhamnolipids. Additionally, analysis of fatty acids and rhamnolipid homologues produced using different carbon sources was performed by mass spectrometry. The results indicate that this biosurfactant maintain its properties in the presence of additives. NaCl decreases the size and number of aggregates formed in solutions without pH control, while ethanol to rhamnolipid solutions reduces critical micelle concentration and favors aggregation of monomers. The profiles of fatty acids produced by P. aeruginosa LBI 2A1 varied according to the carbon source used, however for rhamnolipids there was no difference.

Publisher

Walter de Gruyter GmbH

Subject

Condensed Matter Physics,General Chemical Engineering,General Chemistry

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