The physicochemical properties and chemical composition of trehalose lipids produced by Rhodococcus erythropolis 51T7 |
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Authors: | A.M. Marqué s,A. Pinazo,F.J. Aranda,A. Ortiz,M.J. Espuny |
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Affiliation: | a Lab. of Microbiology, Faculty of Pharmacy, University of Barcelona, 08028 Barcelona, Spain b Dept. of Chemical Technology and Surfactants, Institute of Advanced Chemistry of Catalonia, CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain c Dept. of Biochemistry and Molecular Biology-A, Faculty of Veterinary, University of Murcia, E-30100 Murcia, Spain |
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Abstract: | This study analyzed the chemical and physical properties of a biosurfactant synthesized by Rhodococcus sp. 51T7. The biosurfactant was a trehalose tetraester (THL) consisting of six components: one major and five minor. The hydrophobic moieties ranged in size from 9 to 11 carbons. The critical micelle concentration (CMC) was 0.037 g L−1 and the interfacial tension against hexadecane was 5 mN m−1. At pH 7.4 the glycolipid CMC/critical aggregation concentration (CAC) was 0.05 g L−1 and at pH 4 it was 0.034 g L−1. A phase diagram revealed effective emulsification with water and paraffin or isopropyl myristate. A composition of 11.3-7.5-81.8 (isopropyl myristate-THL-W) was stable for at least 3 months. The HLB was 11 and the phase behaviour of the glycolipid revealed the formation of lamellar and hexagonal liquid-crystalline textures. |
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Keywords: | Biosurfactant Rhodococcus erythropolis Surface tension CMC/CAC Phase diagram Liquid crystals |
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