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Article Dans Une Revue Langmuir Année : 2023

Self-Assembly of Rhamnolipid Bioamphiphiles: Understanding Structure-Properties Relationship using Small-Angle X-Ray Scattering

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The structure-properties relationship of rhamnolipids, RLs, well known microbial bioamphiphiles (biosurfactants), is exlored in detail by coupling cryogenic transmission electron microscopy (cryo-TEM) and both ex situ and in situ small angle X-ray scattering (SAXS). The self-assembly of three RLs with reasoned variation of their molecular structure (RhaC10, RhaC10C10 and RhaRhaC10C10) and a rhamnose-free C10C10 fatty acid is studied in water as a function of pH. It is found that RhaC10 and RhaRhaC10C10 form micelles in a broad pH range and RhaC10C10 undergoes a micelle-to-vesicle transition from basic to acid pH occurring at pH 6.5. Modelling coupled to fitting SAXS data allows a good estimation of the hydrophobic core radius (or length), the hydrophilic shell thickness, the aggregation number and the surface area per RL. The essentially micellar morphology found for RhaC10 and
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hal-04125912 , version 1 (26-06-2023)

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Niki Baccile, Alexandre Poirier, Javier Pérez, Petra Pernot, Patrick Legriel, et al.. Self-Assembly of Rhamnolipid Bioamphiphiles: Understanding Structure-Properties Relationship using Small-Angle X-Ray Scattering. Langmuir, 2023, 39, pp.9273-9289. ⟨10.1021/acs.langmuir.3c00336⟩. ⟨hal-04125912⟩
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