Surface charge of acidic sophorolipid micelles: effect of base and timeReport as inadecuate

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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 Aarhus University Aarhus 3 Cryomicroscopie Moléculaire Plate-forme 4 InBio

Abstract : Acidic sophorolipids, SL–COOH, bio-derived glycolipids, are known to form micelles whose interactions vary as a function of pH. Upon partial ionization of the COOH group, intermicellar interactions take place. Here, we explore the nature of these interactions by using small angle neutron scattering SANS on SL–COOH solutions to which increasing amounts of NaOH are added. The effect of the nature of the base is also explored by replacing NaOH with aqueous NH3, KOH and CaOH2. Time effects up to 36 days are also discussed. All SANS data have been successfully fitted using an appropriate model of core–shell prolate ellipsoids of revolution with an interaction potential, Ur, which combines hard-sphere and screened Coulomb described by a repulsive Yukawa potential potentials. Modelling quantifies the effect of the base in terms of micellar size, effective surface charge and interfacial hydration, thus showing the possibility of tuning them at will.

Author: Niki Baccile - Jan Skov Pedersen - Gerard Pehau-Arnaudet - Inge N. A. Van Bogaert -



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