Isolation of lipopeptide bio-surfactant-producing bacteria from compost.

Four microorganisms have been obtained from samples of agricultural compost,which are characterized by capabilities of depressing the surface tension of fermentation liquor to less than 40mN/m,among other things,three might produce lipopeptide according to the analysis by TLC.The further research on Strain B2 involves purifying its bio-surfactant and the analysis using FT-IR,resulting in identification of the biosurfactant as a cyclic lipopeptide analogue.It has been also showed that pure lipopeptide can depress surface tension of pure water.As a result,bio-surfactant-producing microorganisms are obviously produced during the composting process of agricultural wastes,which have a fairly good surface activity.