Factors affecting rhamnolipids production by Pseudomonas Aeruginosa LBI

• Autor(a) principal: Silva, Barbara Henning
• Data de Publicação: 2008
• Outros Autores: Pirôllo, Maria Paula Santos, Lovaglio, Roberta, Costa Siddhartha, G. V.A.O., Contiero, Jonas [UNESP], Loschchagin, Pizzolitto Elisabeth [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/231849
• topic: Carbon source; Metal ions; Nitrogen source; Pseudomonas aeruginosa; Rhamnolipid

This paper presents the results from study investigating the capacity of Pseudomonas aeruginosa LBI growing on several carbon (Hydrophilic substrate) and nitrogen sources. The carbon source (2%) studied were: glycerol, manitol, fructose, glucose, lactose and the nitrogen sources (2; 3; 4 and 5%) were: NaNO3, NH4NO3, (NH4)2SO4 and (NH2)2CO. At the 96 h of fermentation, the medium with glycerol as a carbon source reached 7.9 g/L of rhamnolipids and 1.2 g/L cellular protein. The surface tension reduction was 38.46 % for glycerol as a carbon source. The NaNO3 at 3% was the best concentration for rhamnolipids production (7.35 g/L) and cellular protein (1.12 g.L). The influences of metal ions [FeSO4.7H2O (0.001 g/L, 0.005 g/L and 0.1 g/L)] and MgSO4.7H2O (0.001 g/L, 0.005 g/L and 0.1 g/L)] on ramnolipids production were studied. Fe2+ had a negative influence on the studied concentrations while Mg2+ had a positive influence when its concentration was increased.