Cassava wastewater as a substrate for the simultaneous production of rhamnolipids and polyhydroxyalkanoates by <Emphasis Type="Italic">Pseudomonas aeruginosa</Emphasis> |
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| Authors: | Siddhartha G V A O Costa François Lépine Sylvain Milot Eric Déziel Marcia Nitschke Jonas Contiero |
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| Institution: | 1.Department of Biochemistry and Microbiology, Biological Sciences Institute,S?o Paulo State University (UNESP),Rio Claro,Brazil;2.INRS, Institut Armand-Frappier,Laval,Canada;3.Department of Physical-Chemistry, Institute of Chemistry,University of S?o Paulo (USP),S?o Carlos,Brazil |
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| Abstract: | Glycerol, cassava wastewater (CW), waste cooking oil and CW with waste frying oils were evaluated as alternative low-cost
carbon substrates for the production of rhamnolipids and polyhydroxyalkanoates (PHAs) by various Pseudomonas aeruginosa strains. The polymers and surfactants produced were characterized by gas chromatography–mass spectrophotometry (MS) and by
high-performance liquid chromatography–MS, and their composition was found to vary with the carbon source and the strain used
in the fermentation. The best overall production of rhamnolipids and PHAs was obtained with CW with frying oil as the carbon
source, with PHA production corresponding to 39% of the cell dry weight and rhamnolipid production being 660 mg l−1. Under these conditions, the surface tension of the culture decreased to 30 mN m−1, and the critical micelle concentration was 26.5 mg l−1. It would appear that CW with frying oil has the highest potential as an alternative substrate, and its use may contribute
to a reduction in the overall environmental impact generated by discarding such residues. |
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| Keywords: | Cassava wastewater Glycerol Polyhydroxyalkanoates Pseudomonas aeruginosa Rhamnolipids Waste cooking oil |
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