抄録
A bacterium, strain SD-74, which was isolated from soil under alkaline conditions, was found to abundantly produce acidic exolipids from n-alkanes. The strain proved to be alkali-resistant rather than alkalophilic and was identified as Rhodococcus erythropolis.
The acidic exolipids (15 g) were isolated from culture broth (11) containing n-hexadecane as the sole carbon source and were found to be composed of two new succinoyl trehalose lipids (STL-1 and STL-2). After purification, STL-1 showed mp 169 to 171°C and [α]20D +92.3° (c = 0.6, CHCl3/MeOH = 2:1), and STL-2 mp 161 to 163°C and [α]20D +75.0° (c = 0.6, CHCl3/MeOH = 2:1). On the basis of the results of chemical degradation and methylation, STL-1 and STL-2 were concluded to be 2, 3, 4, 2'-di-O-succinoyl-di-O-alkanoyl-α, α-trehalose and 2, 3, 4-mono-O-succinoyl-di-O-alkanoyl-α, α-trehalose, respectively.
