By considering the importance of biosurfactants and their role in biodegradation of hydrocarbons and other industrial applications, the present investigation was conducted with the following objectives: Satisfactory emulsification activity of the biosurfactant against eight different hydrocarbons indicated its diverse applicability against different hydrocarbon pollution. Stationary phase and quorum sensing-related factors Stationary phase is a physiological state frequently related to nutrient scarcity. Optimization and production of a biosurfactant from the sponge-associated marine fungus Aspergillus ustus MSF3. Rational metabolic and cellular engineering approaches have been successfully applied to improve strain performance in several cases of biotechnological production of small-volume and high-value bioproducts. An improved strategy to surfactant-enhanced remediation SER is to apply mixture of surfactants at reduced concentration of individual surfactants, which reduces the cost while maintaining the efficiency of remediation [ 17 ].
Some regulatory factors have been identified as involved on rhamnolipids production, however their environmental stimuli are still to be discovered. All the experiments were done in triplicate. An important environmental condition which highly influences the rhamnolipid production in P. GacS-GacA can have opposite effects on rhamnolipids production, evidencing a complex regulation. Introduction Surfactants are amphiphilic molecules that, due to their structure, tend to accumulate at the interfaces between fluid phases with different polarities e. The sugar cane molasses is composed of total sugars of
Sugar cane molasses had the niosurfactant emulsification index, suggesting its good ability to be used as substrate in the production of biosurfactants.
Moreover, pre-coated vinyl urethral catheters with surfactin were shown to reduce biofilm formation by several Salmonella species and other infectious bacteria [ 56 ].
Rhamnolipids produced by Nocardioides sp. The production of surfactin by Bacillus subtilis grown on peat hydrolysate.
On the use of waste frying oil in the biosurfxctant of sophorolipids. Emulsifier, MEOR, alkane dissimilation.
Rhamnolipid production with indigenous Pseudomonas aeruginosa EM1 isolated from oil-contaminated site. Utilization of restaurants waste oil as a precursor for sophorolipid production.
The global biosurfactants market volume is expected to reachEmulsification activity, Virgibacillus salariusSophorolipids, Rhamnolipids. Currently, the main application is for enhancement of productoin recovery and hydrocarbon bioremediation due to their biodegradability and productjon critical micelle concentration CMC [ 13 ]. Carbohydrate content of the biosurfactant was determined by the phenol—sulfuric acid method [ 14 ] using d -glucose as a standard.
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This assay relies on the destabilization of liquid droplets by biosurfactants. Laboratory Scale Experiment on Biodegradation of Crude Oil with Biosurfactant Biodegradation of crude oil in the laboratory scale experiment inferred that, maximum biodegradation was found with biosurfactant bioxurfactant fertilizer added set Trehalose lipids produced by Rhodococcus erythropolis were shown to have good solubilization capacity for hydrophobic compounds such as phenanthrene, and great potential for applications in bioremediation of sites contaminated with PAHs [ 30 ].
Bioaugmentation has been subject of several reports including use of genetically engineered microorganisms reviewed in Gentry et al.
The disposal of frying oil waste is causing a great problem, which explains the increasing interest in the use of waste frying oils for microbial transformation Vedaraman and Venkatesh, Glycolipids and lipopeptides are the most important biosurfactants BS for commercial purpose Table 1.
They have been reported to inhibit pathogenic bacteria and fungi and to reduce adhesion of pathogenic microorganisms to glass, silicone rubber, and surgical implants [ 13202123 ]. Production and roles of biosurfactants and bioemulsifiers in accessing hydrophobic substrates. The emulsification index of the supernatants obtained with glycerol or sugar cane molasses as substrates is presented in Table 2. Waste motor lubricant oil is waste oil drained from geared motor vehicles after a long run, which contains weathered hydrocarbon fractions and may be useful for the biosurfactant production.
Handbook of Hydrocarbon and Lipid Microbiology. National Center theis Biotechnology InformationU. These studies demonstrated the feasibility to reuse waste frying oil for production of both sophorolipids and blosurfactant on an industrial scale. Biosurfactants as emulsifying agents for hydrocarbons. Therefore, most researches have been focusing on increasing the production yield, reducing raw material cost and developing oxygenation strategies to reduce foaming formation [ 4661 ].
Van Der Mei, G.
Nature London ; The results of isolates of bacteria on blood agar media were similar to the work done by Mulligan et al. West frying oil and urea were used as the carbon and nitrogen sources.
However, Busscher et al. Sharma and Saharan [ 57 ] also showed that culture supernatants of Lactobacillus strains are active against E. Increasing biosurfactant yields and decreasing production costs are essential factors affecting the efficiency of biosurfactant production process Kosaric, ; Bognolo, ; Moussa et al.
A promising and abundant carbon source for industrial microbiology. The results observed in this study are similar to those reported by Lu [ 72 ] who showed that rhamnolipids biosurfactants are able to stabilize oil in water emulsions for 72 hours.