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Article Dans Une Revue Soft Matter Année : 2014

pH-triggered formation of nanoribbons from yeast-derived glycolipid biosurfactants

Résumé

In the present paper, we show that the saturated form of acidic sophorolipids, a family of industrially scaled bolaform microbial glycolipids, unexpectedly forms chiral nanofibers only at pH below 7.5. In particular, we illustrate that this phenomenon derives from a subtle cooperative effect of molecular chirality, hydrogen bonding, van der Waals forces and steric hindrance. The pH-responsive behaviour was shown by Dynamic Light Scattering (DLS), pH-titration and Field Emission Scanning Electron Microscopy (FE-SEM) while the nanoscale chirality was evidenced by Circular Dichroism (CD) and cryo Transmission Electron Microscopy (cryo-TEM). The packing of sophorolipids within the ribbons was studied using Small Angle Neutron Scattering (SANS), Wide Angle X-ray Scattering (WAXS) and 2D H-1-H-1 through-space correlations via Nuclear Magnetic Resonance under very fast (67 kHz) Magic Angle Spinning (MAS-NMR).

Domaines

Matériaux
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Dates et versions

hal-01275054 , version 1 (03-02-2017)

Identifiants

Citer

Anne-Sophie Cuvier, Jan Berton, Christian V. Stevens, Giulia C. Fadda, Florence Babonneau, et al.. pH-triggered formation of nanoribbons from yeast-derived glycolipid biosurfactants. Soft Matter, 2014, 10 (22), pp.3950-3959. ⟨10.1039/c4sm00111g⟩. ⟨hal-01275054⟩
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