Production and properties of a bioemulsifier synthesized by phenanthrene-degrading Penicillium sp.

Characterization of new biosurfactant produced by Trichosporon montevideense CLOA 72 isolated from dairy industry effluents

“…A similar composition of fatty acids has been described for surfactants produced by Y. lipolytica IMUFRJ 50682 [8] and Penicillium sp. [33]. The fatty acids were not detected from crude and pure biosurfactants samples, not hydrolyzed, suggesting their absence in these samples and the efficient removal with chloroform/methanol treatment.…”

“…No significant emulsifying activity was observed when concentrations below 0.19 mg/ml were used. This is in agreement with results reported previously for a bioemulsifier produced by Penicillium sp., which presented saturation levels above 4 mg/ml [33].…”

“…The activity of the Penicillium sp. bioemulsifier was stable over a wide range of pH (3 to 9) [33], and the emulsifier of Y. lipolytica was stable and active in pH values ranging from 2 to 10 [35].…”

“…Most known biosurfactants are less stable over such salt concentrations [35,36]. The largest stabilities were described for the biosurfactant produced by Penicillium sp., whose emulsifying activity was not impended by the addition of NaCl (5 -20%) [33], and for the surfaceactive compound synthesized by Bacillus subtilis LB5, that retained its properties during exposure to 20% NaCl [6]. The electrolytes used in this study are widely used in industry for the treatment of liquid effluents or recovery of oil as biodiesel.…”

Characterization of Biosurfactant Produced by a Novel Thermophillic Strain (Geobacillus thermoleovorans JQ 912239)

“…Bacteria have designed strategic approaches to overcome the harsh effects of organic solvents and heavy metals in contaminated soil by producing bioemulsifiers which can reduce the surface tension, interfacial tension of bacteria and increase the cell surface hydrophobicity of bacteria, thereby enhancing the dispersal, emulsification and degradation of hydrocarbon pollutants in the contaminated site (Al-Tahhan et al, 2000). The terms biosurfactant and bioemulsifier have often been used interchangeably to describe surface active biomolecules (Uzoigew et al, 2015), that are synthesized by microorganisms (Luna-Velasco et al, 2007) such as bacteria, fungi and yeast (Priya and Usharani, 2009). Biosurfactant are amphiphilic compounds contain hydrophobic and hydrophilic moieties that reduce surface tension and interfacial tension between individual molecules at the surface and interface respectively, which either adhere to cell surfaces or are excreted extracellularly in the growth medium (Mulligan, 2005).…”