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Lookup NU author(s): Dr Turgay Pekdemir
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Surface-tension-lowering capacity and emulsion-forming ability of aescin biosurfactant in pure water, seawater, 3 M urea, and 3 M glucose were investigated. Oils used in the emulsification tests were liquid paraffin, ethylbenzene, kerosene, 1-decene, and heavy oils A and C. Volumetric ratios of oil phase to aqueous (water) phase (O/W) were 0.5:4.5, 2.5:2.5, 3.0:2.0, and 4.5:0.5. Concentration of aescin was changed from 0.16 to 27.3 mM. The critical micelle concentration of aescin in water and its surface tension effectiveness were shown to be 0.78 mM and 28.5 mN/m, respectively. Surface-tension effectiveness of aescin was found to be highest in seawater (33.5 mN/m). The emulsifying action of aescin was compared with that of decaglyceryl-monolaurylester (DGML). The performance of aescin was found to be as good as that of DGML and, depending on the O/W ratio and the concentration, aescin could yield emulsification efficiencies as high as 100%. These results indicated that aescin could be classified as a mild surfactant safe for living organisms. Because the surface activity of aqueous aescin solution was not satisfactorily good, attempts were made to improve the situation by addition of alcohols as cosurfactants. Ethanol, isoamyl alcohol, 2-ethylhexanol, n-hexanol, and n-octanol were used. They were added to the solutions at a concentration equimolar to aescin. These cosurfactants improved surface-tension effectiveness of aescin by as much as 53% and its emulsification efficiency by 67%. Copyright © 1999 by AOCS Press.
Author(s): Pekdemir T, Ishigami Y, Uchiyama H
Publication type: Article
Publication status: Published
Journal: Journal of Surfactants and Detergents
Year: 1999
Volume: 2
Issue: 3
Pages: 337-341
Print publication date: 01/07/1999
ISSN (print): 1097-3958
ISSN (electronic): 1558-9293
Publisher: Springer
URL: http://dx.doi.org/10.1007/s11743-999-0086-3
DOI: 10.1007/s11743-999-0086-3
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