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Lipophilic compounds of the culture suspension containingRhodococcus erythropolis DSM43215 had surfactant properties when the bacteria were cultivated withn -alkanes as the sole carbon source. Thirteen main components from a dichloromethane-methanol extract of theR. erythropolis cultures were isolated and characterized to specify quantitatively their surfactant properties, e.g., minimum surface and interfacial tensions and critical micelle concentrations. The interfacial activity of the organic extract was dominated by α,α-trehalose-6,6′-dicorynomycolates which reduced interfacial tension from 44 to 18 mN/m. Phosphatidylethanolamines which were also present in the organic extract reduced the interfacial tension below 1 mN/m. The trehalose corynomycolates had extremely low critical micelle concentrations in high-salinity solutions, and the interfacial properties were stabile in solutions with a wide range of pH and ionic strength.

Chemical and Physical Characterization of Interfacial-Active Lipids from Rhodococcus erythropolis Grown on n -Alkanes