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- Title
Nanoscale Platelet Formation by Monounsaturated and Saturated Sophorolipids under Basic pH Conditions.
- Authors
Cuvier, Anne ‐ Sophie; Babonneau, Florence; Berton, Jan; Stevens, Christian V.; Fadda, Giulia C.; Péhau ‐ Arnaudet, Gérard; Le Griel, Patrick; Prévost, Sylvain; Perez, Javier; Baccile, Niki
- Abstract
The self-assembly behavior of the yeast-derived bolaamphiphile sophorolipid (SL) is generally studied under acidic/neutral pH conditions, at which micellar and fibrillar aggregates are commonly found, according to the (un)satu-ration of the aliphatic chain: the cis form, which corresponds to the oleic acid form of SL, spontaneously forms micelles, whereas the saturated form, which corresponds to the stea-ric acid form of SL, preferentially forms chiral fibers. By using small-angle light and X-ray scattering (SLS, SAXS) combined with high-sensitivity transmission electron microscopy imaging under cryogenic conditions (cryo-TEM), the nature of the self-assembled structures formed by these two compounds above pH 10, which is the pH at which they are negatively charged due to the presence of a carboxylate group, has been explored. Under these conditions, these compounds self-assemble into nanoscale platelets, despite the different molecular structures. This work shows that the electrostatic repulsion forces generated by COO- mainly drive the self-assembly process at basic pH, in contrast with that found at pH below neutrality, at which self-assembly is driven by van der Waals forces and hydrogen bonding, and thus, is in agreement with previous findings on carbohydrate-based gemini surfactants.
- Subjects
AMPHIPHILES; MOLECULAR self-assembly; MICELLAR catalysis; OLEIC acid; X-ray scattering; TRANSMISSION electron microscopy
- Publication
Chemistry - A European Journal, 2015, Vol 21, Issue 52, p19265
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201502933