pH-triggered formation of nanoribbons from yeast-derived glycolipid biosurfactantsReportar como inadecuado




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1 SMiLES - Spectroscopie, Modélisation, Interfaces pour L-Environnement et la Santé LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris 2 SynBioC Research Group Ghent Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering Gent 3 LLB - UMR 12 - Laboratoire Léon Brillouin 4 LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris 5 InBio, Department of Biochemical and Microbial Technology 6 Microscopie Ultrastructurale Plate-forme

Abstract : 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.





Autor: Anne-Sophie Cuvier - Jan Berton - Christian V. Stevens - Giulia C. Fadda - Florence Babonneau - Inge N. A. Van Bogaert - Wim Soet

Fuente: https://hal.archives-ouvertes.fr/



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