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Micelles versus ribbons : how congeners drive the self-assembly of acidic sophorolipid biosurfactants

(2017) CHEMPHYSCHEM. 18(6). p.643-652
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Abstract
Sophorolipids (SLs), a class of microbially derived biosurfactants, are reported by different research groups to have different self-assembled structures (either micelles or giant ribbons) under the same conditions. Here we explore the reasons behind these contradictory results and attribute these differences to the role of specific congeners that are present in minute quantities. We show that a sample composed of a majority of oleic acid (C18:1) sophorolipid in the presence of only 0.5% (or more) of congeners with stearic acid (C18:0) or linoleic acid (C18:2) results in the formation of micelles that are stable over long periods of time. Conversely, the presence of only 10 to 15% of congeners with a stearic acid chain gives fibrillar structures instead of micelles. To study the mechanisms responsible, oleic acid SLs devoid of any other congeners were prepared. Very interestingly, this sample can self-assemble into either micelles or fibers depending on minute modifications to the self-assembly conditions. The findings are supported by light scattering, small-angle X-ray scattering, transmission electron microscopy under cryogenic conditions, high-pressure liquid chromatography, and NMR spectroscopy.
Keywords
biosurfactants, glycolipids, micelles, self-assembly, sophorolipids, SODIUM DODECYL-SULFATE, MICROBIAL-PRODUCTION, RHAMNOLIPIDS, SURFACE, GLYCOLIPIDS, IMPURITIES, ADSORPTION, SULFONATE, LIPIDS

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Chicago
Dhasaiyan, Prabhu, Patrick Le Griel, Sophie Roelants, Emile Redant, Inge Van Bogaert, Sylvain Prevost, BLV Prasad, and Niki Baccile. 2017. “Micelles Versus Ribbons : How Congeners Drive the Self-assembly of Acidic Sophorolipid Biosurfactants.” Chemphyschem 18 (6): 643–652.
APA
Dhasaiyan, P., Le Griel, P., Roelants, S., Redant, E., Van Bogaert, I., Prevost, S., Prasad, B., et al. (2017). Micelles versus ribbons : how congeners drive the self-assembly of acidic sophorolipid biosurfactants. CHEMPHYSCHEM, 18(6), 643–652.
Vancouver
1.
Dhasaiyan P, Le Griel P, Roelants S, Redant E, Van Bogaert I, Prevost S, et al. Micelles versus ribbons : how congeners drive the self-assembly of acidic sophorolipid biosurfactants. CHEMPHYSCHEM. 2017;18(6):643–52.
MLA
Dhasaiyan, Prabhu, Patrick Le Griel, Sophie Roelants, et al. “Micelles Versus Ribbons : How Congeners Drive the Self-assembly of Acidic Sophorolipid Biosurfactants.” CHEMPHYSCHEM 18.6 (2017): 643–652. Print.
@article{8544803,
  abstract     = {Sophorolipids (SLs), a class of microbially derived biosurfactants, are reported by different research groups to have different self-assembled structures (either micelles or giant ribbons) under the same conditions. Here we explore the reasons behind these contradictory results and attribute these differences to the role of specific congeners that are present in minute quantities. We show that a sample composed of a majority of oleic acid (C18:1) sophorolipid in the presence of only 0.5\% (or more) of congeners with stearic acid (C18:0) or linoleic acid (C18:2) results in the formation of micelles that are stable over long periods of time. Conversely, the presence of only 10 to 15\% of congeners with a stearic acid chain gives fibrillar structures instead of micelles. To study the mechanisms responsible, oleic acid SLs devoid of any other congeners were prepared. Very interestingly, this sample can self-assemble into either micelles or fibers depending on minute modifications to the self-assembly conditions. The findings are supported by light scattering, small-angle X-ray scattering, transmission electron microscopy under cryogenic conditions, high-pressure liquid chromatography, and NMR spectroscopy.},
  author       = {Dhasaiyan, Prabhu and Le\hspace{.25em}Griel, Patrick and Roelants, Sophie and Redant, Emile and Van Bogaert, Inge and Prevost, Sylvain and Prasad, BLV and Baccile, Niki},
  issn         = {1439-4235},
  journal      = {CHEMPHYSCHEM},
  keyword      = {biosurfactants,glycolipids,micelles,self-assembly,sophorolipids,SODIUM DODECYL-SULFATE,MICROBIAL-PRODUCTION,RHAMNOLIPIDS,SURFACE,GLYCOLIPIDS,IMPURITIES,ADSORPTION,SULFONATE,LIPIDS},
  language     = {eng},
  number       = {6},
  pages        = {643--652},
  title        = {Micelles versus ribbons : how congeners drive the self-assembly of acidic sophorolipid biosurfactants},
  url          = {http://dx.doi.org/10.1002/cphc.201601323},
  volume       = {18},
  year         = {2017},
}

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