A. Abalos et al., Physicochemical and antimicrobial properties of new rhamnolipids produced by Pseudomonas aeruginosa AT10 from soybean oil refinery wastes, LANGMUIR, 17(5), 2001, pp. 1367-1371
The rhamnolipids produced by Pseudomonas aeruginosa strains are often a mix
ture of several homologues. Up to seven (R2C10C10 + R1C10C10 + R2C10C12 + R
1C10C12 + R1C12:1C10 + R1C12:2 + R1C8:2)have been identified in cultures of
P. aeruginosa AT10 from soybean oil refinery wastes. This study deals with
the production, purification, and identification of rhamnolipids in the mi
xture (M-7), as well as their physical and chemical characterization and th
e evaluation of their antimicrobial properties. The surface tension decreas
es to 26.8 mN/m and the critical micelle concentration value to 1.2 x 10(2)
mg/L. These molecules show excellent antifungal properties against Aspergi
llus niger and Gliocadium virens (16 mug/mL) and C. globosum, P. crysogenun
, and A. pullulans (32 mug/mL), whereas the growth of the phytopathogenic f
ungi B. Cinerea and R. solani was inhibited at 18 mug/mL.