BACKGROUND Lipopeptides are known as promising microbial surfactants and have been successfully used in enhancing oil recovery in extreme environmental conditions. A biosurfactant-producing strain, Bacillus atrophaeus 5-2a, was recently isolated from an oil-contaminated soil in the Ansai oilfield, Northwest China. In this study, we evaluated the crude oil removal efficiency of lipopeptide biosu...

Biosurfactants produced by an isolated thermophilic strain Acinetobacter calcoaceticus BU03 were demonstrated to be effective in enhancing the solubility of polycyclic aromatic hydrocarbons (PAHs) and the present study aimed at investigating its effectiveness in increasing bioavailability of PAHs in soil for biodegradation under thermophilic composting condition. At 25 times of its critical mic...

Biosurfactants are surface active compounds derived from living organisms, mainly microorganisms. Almost all surfactants currently in use are chemically derived from petroleum. However, in recent years, the interest in chemical surfactants has been substituted by an increase in the use of microbial surfactants. Compared with chemical surfactants, biosurfactants have more advantages, for example...

Interest in biosurfactants has increased considerably in recent years, as they are potentially used in many commercial applications in petroleum, pharmaceuticals, biomedical, and food processing industries. Since improvement of their production was of great importance to reduce the final coast, cultural conditions were analyzed to optimize biosurfactants production from Bacillus subtilis SPB1 s...

Global biosurfactants market http://www.prweb.com/releases/2012/11/ prweb10158903.htm While the full report is available only for a fee, this page hints at the importance of biosurfactants commercially. Biosurfactant-producing bacteria http://www.ideaconnection.com/crowdfunding/ isolation-and-characterization-of-biosurfactant-produ -00041.html This page on the IdeaConnection website proposes re...

A Pseudomonas aeruginosa mutant derived by random mutagenesis with N-methyl-N-nitro-Nnitrosoguanidine, producing high levels of the rhamnolipid biosurfactants was selected on SiegmundWagner (SW) plates. The mutant designated P. aeruginosa PTCC1637 produces rhamnolipids at concentrations 10 time more than parent strain. NMR analysis and surface tension measurement showed that the biosurfactants...

Due to their non-toxic nature, biodegradability and production from renewable resources, research has shown an increasing interest in the use of biosurfactants in a wide variety of applications. This paper reviews the characterization of rhamnolipid and sophorolipid biosurfactants based on their hydrophilicity/hydrophobicity and their ability to form microemulsions with a range of oils without ...

Despite the nutritional significance of sulfur, its influence on biosurfactants production has not been sufficiently studied. We investigated the expression of key biosurfactants production genes, rhlABC, in cultures of Pseudomonas sp. AK6U grown with inorganic or organic sulfur sources. AK6U grew with either inorganic sulfate (MgSO4), dibenzothiophene (DBT), or DBT-sulfone as a sole sulfur sou...

Biosurfactants are widely known as surface active agents of biological origin. Glycolipid classes of biosurfactants has high important in the biotechnological arena. Pseudomonas aeruginosa, Bacillus subtilis, and Candida sp., are important classes of microorganism and highly investigated for the production of glycolipid biosurfactants. Commercially, microbial biosurfactants are more advantageou...

The yeast species viz. Rhodotorula muciliginosa and Candida rugosa isolated from hydrocarbon contaminated sites were capable of producing biosurfactants in the presence of 2% (v/v) diesel as sole source of carbon and energy. The crude biosurfactants were purified using silica gel column chromatography followed by dialysis. Chemical structures of the purified biosurfactants were identified as di...