Emulsification potential of a newly isolated biosurfactant-producing bacterium, Rhodococcus sp. strain TA6

Production and characterization of biosurfactant by free and immobilized cells fromOchrobactrum intermediumisolated from the soil of southern Algeria with a view to environmental application

“…Similar results were obtained for biosurfactant produced by P. aeruginosa MR01 [30] comparison; the synthetic surfactant SDS maintains its emulsifying capacity for pH values ranging between 4.0 and 9.5. Emulsification capacity was very sensitive to the pH changes [36]. On the other hand, Figure 8(c) shows that the addition of NaCl in the range of concentrations tested (5-100 g L ¡1 ) had only a weak effect on ST of the biosurfactant (average ST = 31 dyn cm ¡1 ).…”

Research Status of Surfactant Producing Microbiology in MEOR: A Review

“…The biosurfactant was stable during exposure to high salinity (10% NaCl), elevated temperatures (120°C for 15min) and within a wide pH range (4.0-10.0). The culture broth was effective in recovering up to 70% of the residual oil from oilsaturated sand packs (Shavandi, 2011). …”

Analysis of Biosurfactant Production by a New Thermophilic and Halotolerant Bacterium, Geobacillus sp. QT

“…There appeared several colonies and pure cultures of each morphologically distinct colonies were obtained by repetitive streaking onto solid LB medium. To isolate the strains capable of biosurfactant production, oil spreading method [2,12] and hemolytic activity [13] were applied. Among several bacterial strains isolated, a potent biosurfactantproducing bacterial strain was identified and examined as creation of significant clear zone on the oil surface and maintained on LB agar medium at 4°C for further experiments.…”

“…Therefore, attentions have been paid to the alternative environmental friendly manners for the production of these surface-active compounds especially microbiological production of surfactants. The main reason is that biosurfactants take advantages over synthetic counterparts like lower toxicity, biodegradability, better environmental compatibility, higher foaming, high selectivity, specific activity at extreme temperatures, pH and salinity [2,8,9].…”

“…Microbial surface-active agents or biosurfactants are amphiphilic molecules consisting of hydrophobic and hydrophilic moieties and tend to interact with interfaces of various polarities and reduce the surface and interfacial tension of solutions [1,2]. Many microorganisms produce biosurfactants during growth on variety of substrates, and the biochemical and structural characteristics of these compounds are very diverse [3,4].…”