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pH- and time-resolved in-situ SAXS study of self-assembled twisted ribbons formed by elaidic acid sophorolipids

Abstract : Conditions that favor the helical structure formation in structurally similar sophorolipids (SLs), that is, elaidic acid SLs (having trans double bond between the C9 - C10 positions of the alkyl chain) and stearic acid SLs (no double bond) are presented here. The helical self – assembled structures formed by elaidic acid SLs were independent of pH and also were mediated by micellar intermediate. On the other hand, the stearic acid SLs formed helical structures under low pH condition only. Astonishingly, the formation routes were found to be different, albeit the molecular geometry of both the SLs is similar. Though a conclusive mechanistic understanding must await further work, our studies strongly point out that the non - covalent weak interactions in elaidic acid SL are able to overcome the electrostatic repulsions of the sophorolipid carboxylate groups at basic pH and facilitating the formation of helical structures. On the other hand, the hydrophobic interactions in stearic acid SLs endows the helical structures extra stability making them less vulnerable to dissolution upon heating.
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Prabhu Dhasaiyan, Sylvain Prevost, Niki Baccile, Bhagavatula L V Prasad. pH- and time-resolved in-situ SAXS study of self-assembled twisted ribbons formed by elaidic acid sophorolipids. Langmuir, American Chemical Society, 2018, 34 (5), pp.2121-2131. ⟨10.1021/acs.langmuir.7b03164⟩. ⟨hal-01675234⟩

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