Biological Modification of the Fatty Acid Group in an Emulsan by Supplementing Fatty Acids under Conditions Inhibiting Fatty Acid Biosynthesis

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When the concentration of the antibiotic cerulenin was increased up to 3.0 mg/Z in medium containing ethanol as a carbon source, the specific growth rate of Acinetobucter culcouceticus and the fatty acid content of the emulsan decreased from 0.179 h-l and 13.9% to 0.015 h-l and 3.4x, respectively. The emulsifying activity in medium containing cerulenin decreased with increasing cerulenin concentration. In the culture containing 3.0 mg/l cerulenin, fatty acid biosynthesis was inhibited. Various fatty acids were added to this inhibitory culture as a second carbon source to modify the fatty acid group in the emulsan. When an odd-numbered fatty acid was added, the resulting emulsan was found to have other odd-numbered fatty acids that were not present originally. Among the emulsan produced from even-numbered fatty acids, the emulsan produced from myristic acid ((214) contained the greatest amount of the same-numbered fatty acids. When the amount of supplemental my&tic acid was increased, the myristic acid content in the emulsan increased, but its emulsifying activity decreased.
Publisher
Elsevier
Issue Date
2000
Keywords

emulsan; biological modification; fatty acid; cerulenin

Citation

Journal of Bioscience andd Bioengineering, Vol.90, No.3, pp.308-312

ISSN
1389-1723
DOI
10.1016/S1389-1723(00)80086-9
URI
http://hdl.handle.net/10203/18321
Appears in Collection
BS-Journal Papers(저널논문)
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