Authors S. Mukherjee and P. Das contributed equally to this work.
Antimicrobial biosurfactants from marine Bacillus circulans: extracellular synthesis and purification
Version of Record online: 2 FEB 2009
© 2009 The Authors. Journal compilation © 2009 The Society for Applied Microbiology
Letters in Applied Microbiology
Volume 48, Issue 3, pages 281–288, March 2009
How to Cite
Mukherjee, S., Das, P., Sivapathasekaran, C. and Sen, R. (2009), Antimicrobial biosurfactants from marine Bacillus circulans: extracellular synthesis and purification. Letters in Applied Microbiology, 48: 281–288. doi: 10.1111/j.1472-765X.2008.02485.x
- Issue online: 9 FEB 2009
- Version of Record online: 2 FEB 2009
- 2008/0394: received 6 March 2008, revised 8 September 2008 and accepted 9 September 2008
Aims: To purify the biosurfactant produced by a marine Bacillus circulans strain and evaluate the improvement in surface and antimicrobial activities.
Methods and Results: The study of biosurfactant production by B. circulans was carried out in glucose mineral salts (GMS) medium using high performance thin layer chromatography (HPTLC) for quantitative estimation. The biosurfactant production by this strain was found to be growth-associated showing maximum biosurfactant accumulation at 26 h of fermentation. The crude biosurfactants were purified using gel filtration chromatography with Sephadex® G-50 matrix. The purification attained by employing this technique was evident from UV–visible spectroscopy and TLC analysis of crude and purified biosurfactants. The purified biosurfactants showed an increase in surface activity and a decrease in critical micelle concentration values. The antimicrobial action of the biosurfactants was also enhanced after purification.
Conclusions: The marine B. circulans used in this study produced biosurfactants in a growth-associated manner. High degree of purification could be obtained by using gel filtration chromatography. The purified biosurfactants showed enhanced surface and antimicrobial activities.
Significance and Impact of the Study: The antimicrobial biosurfactant produced by B. circulans could be effectively purified using gel filtration and can serve as new potential drugs in antimicrobial chemotherapy.