Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Biosurfactants"”.
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Efficiency of biosurfactants applied by means of electrokinetics
An evaluation of the efficiency of rhamnolipids (biosurfactants) used in electrokinetic remediation of soil contaminated with phenanthrene was presented. Bench scale tests were conducted using four experimental series in order to determine the feasibility and mechanisms of biosurfactant-enhanced …
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SUSTAINABLE PRODUCTION AND PHYSICO-CHEMICAL CHARACTERIZATION OF BIOSURFACTANTS FROM RENEWABLE RESOURCES
… relative stability over time, of the prepared biosurfactants were evaluated to assess their potential application as bio-emulsifiers in the food, pharmaceutical and cosmetic industries.
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Study of Hydrocarbon Waste Biodegradation and the Role of Biosurfactants in the Process
… degraded simple compounds first, then produced biosurfactants. It was thought that the biosurfactants remained attached to the organism membrane and increased solubility, stimulating the degradation of difficult to degrade waste oil. After oil was degraded the biosurfactants became ineffective. …
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ENZYME ENGINEERING AND GREEN SYNTHESIS OF N-ACYL GLYCINE BIOSURFACTANTS FROM RENEWABLE RAW MATERIALS
… instance, green synthesis of N-acyl glycines as biosurfactants and therapeutics is highly desirable to replace chemical pathways using toxic phosgene. Herein, we report a novel concept for enzymatic amidation in an aqueous system via glycerol activation of fatty acids and their subsequent …
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Conversion of hydrocarbons to biosurfactants : an insight into the bioprocess optimisation of biosurfactant production using alkanes as inducers
… is used. One of the most important groups of biosurfactants is a family of chemical compounds known as glycolipids, whose structure consists of a sugar group and a lipid tail. Glycolipids are subdivided into three main groups: rhamnolipids, sophorolipids and trehalolipids, named following …
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Effects of biologically produced surfactants on the mobility and biodegradation of petroleum hydrocarbons
… effects of biologically produced surfactants (biosurfactants) on petroleum hydrocarbons and their potential for the removal of hydrocarbons from groundwater systems. Bioaurfactanta have been found to be produced by microorganisms during growth on insoluble substrates for the purpose of …
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Screening environmental Pseudomonads for characteristics suitable for a bio-engineered oil remediation agent
Biosurfactants are surface active chemicals expressed by a range of organisms that reduce liquid (aqueous) surface tensions () of aqueous and aqueous-hydrocarbon (oil) mixtures. They are widely used in biotechnology, including agriculture, cosmetics, food, pharmacology and bioremediation, and many …
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The physico-chemical and biological analysis of microbial biosurfactants (BSs) for applications towards cancer therapies, wound healing dressings and drug delivery
Microbial biosurfactants (BSs) are secondary metabolites with a broad-spectrum of therapeutic applications including possible cancer therapy, chronic wound healing and nanoparticulate drug delivery systems. However, due to their individual complexities, there is limited physico-chemical analysis …
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Investigation into the impact of biosurfactant in heavy oil reservoirs
… grains and biosurfactant flooding. Three biosurfactants were produced under laboratory conditions, from three species of the genus bacillus using sucrose 3% (w/v) as their carbon source for growth and metabolism. These species produced biosurfactants of different specific activities that …
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Avaliação do potencial biotecnológico de bactérias láticas para produção de biomulsificantes, bacteriocinas e lipase
… lactic acid bacteria regarding the production of biosurfactants/bioemulsifiers, lipase and bacteriocins. Initially, four strains of LAB were screened for their ability to produce biosurfactants/bioemulsifiers (Lactobacillus acidophilus NRRL B-4495, Lactiplantibacillus plantarum NRRL B-4496, …
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An Evaluation of the Effects of Marine Oil-spills, Remediation Strategies, and Shipwrecks on Microbial Community Structure and Succession
… and the application of dispersants and biosurfactants, in North Sea seawater microcosms is the focus of Chapter Two. Analysis revealed that dispersants and biosurfactants, which significantly reduced the interfacial tension between oil and water, significantly increased growth of …
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Sustainable treatment of oil contaminated waste: oil-based mud (OBM) drill cuttings and soil.
… is one of such technological developments. Biosurfactants are surface active compounds produced from biological origin. They are amphiphilic molecules, consisting of hydrophilic and hydrophobic moieties. The major advantage biosurfactants have over their synthetic counterpart is that they …
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Investigating the impact of microbial interactions with geologic media on geophysical properties
… increased concentrations of organic acids and biosurfactants; (2) mineral weathering promoted by organic acids causes increases in electrolytic conductivity, concomitant with increases in major cation concentrations; (3) interfacial conductivity generally parallels microbial cell concentrations …
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Endophytes as source of polypeptide and polyketide antibiotics fengycin and bacillaene
… method based on a removal and separation of biosurfactants from the culture broth by compressing and harvesting of the liquid surface layer using a new device called Flounder was investigated. The Flounder can be efficiently applied for the separation and concentration of fengycin. The …
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Experimental investigation of sodium surfactin as potential methane-water hydrate formation inhibitor
… maintenance is a huge burden to the industry. Biosurfactants, on the other hand, are low-dosage and environmentally friendly surfactants. Their application was tested and therefore has been established to serve as alternative to conventional chemical surfactants in enhanced oil recovery (EOR). …
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Investigating petroleum oil bioremediation strategies for crude oil contaminated mining sites in Mpumalanga, South Africa
… a combined treatment technique involving biosurfactants and nutrient addition.
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An investigation of biosurfactant-mediated disruption and biological activity in mature biofilms formed on plastic surfaces by LPS mutants of Salmonella enterica serovar Typhimurium
… disinfection and increasing the risk of spread. Biosurfactants, compounds produced by microorganisms, can potentially control biofilm formation as eco-friendly antimicrobial agents and be applied to plastic food packaging to prevent biofilm formation and food spoilage. This study aimed to …
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Bioprospecting surfactants produced by <i>Pseudomonas</i> spp. isolated from soil for potential application in biotechnology
… a range of surface-active compounds called biosurfactants that reduce the surface tension of liquid and exhibit different oil-water behaviours. These are used in various biotechnological applications including agriculture, cosmetics, medical and food. A recent study has predicted a limit to …
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Discovering the Biological Activities of Maltose Derivatives for Controlling Bacterial Multicellular Behaviors
… secreted by Pseudomonas aeruginosa are biosurfactants that are known to be essential for at least three multicellular behaviors of P. aeruginosa, biofilm formation, biofilm dispersion and swarming motility. Maltose derivatives, which are structurally related to</p> <p>rhamnolipids were …
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Controlling Microbial Multicellular Behaviors With Saccharide Derivatives
… is known to secrete rhamnolipids, a class of biosurfactants that plays an important role in maintaining the architecture of its biofilm and promoting its swarming motility. Here we show the ability of certain synthetic nonmicrobicidal disaccharide derivatives (DSDs) to mimic the biofunctions …
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