this work studies the biosurfactants production which enables the diesel biodegradation byusing mixed microbial consortia from polluted sites. it was carried out by culturing three microbial consortia(named as xa, xb and xc) obtained from polluted soils, and enriched in diesel as sole carbon source.batchexperiments were done to study the effects of three variables (temperature,hydrocarbon conce...

Biosurfactants are difficult to produce in an economic manner for several reasons: 1. Overproducing strains of bacteria are rare and those found generally display a very low productivity. In addition complex media need to be applied. 2. The regulation of biosurfactant synthesis is hardly understood, seemingly it represents a "secondary metabolite" regulation. Among others 02-limitation has been...

BACKGROUND Lactobacillus species produce biosurfactants that can contribute to the bacteria's ability to prevent microbial infections associated with urogenital and gastrointestinal tracts and the skin. Here, we described the biological and physicochemical properties of biosurfactants produced by Lactobacillus jensenii P6A and Lactobacillus gasseri P65. RESULTS The biosurfactants produced by ...

Microbially derived surfactants, so-called biosurfactants, have drawn much attention in recent years and are expected to replace current petrochemical surfactants, owing to their environmental and toxicological benefits. One strategy to support that goal is to reduce production costs by replacing relatively expensive sugars with cheaper raw materials, such as short-chain alkanes. Herein, we rep...

Microorganisms are having a large surfaceto-volume ratio and produce a variety of surface-active agents (biosurfactants) that adsorb to and alter the conditions prevailing at interfaces. Biosurfactants are the structurally and chemically diverse group of surface-active molecules synthesized by wide group of microorganisms. Surfactants concentrate at interfaces because they are amphipathic, and ...

Observation of both tensio-active and emulsifying activities indicated that biosurfactants were produced by the newly isolated and promising strain Pseudomonas putida 21BN. The biosurfactants were identified as rhamnolipids, the amphiphilic surface-active glycolipids usually secreted by Pseudomonas spp. Their production was observed when the strain was grown on soluble substrates, such as gluco...