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Issue 8, 2011
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Conformational and segmental dynamics in lipid-based vesicles

Yuri Gerelli,*ab  Victoria García Sakai,c  Jacques Ollivierd  and  Antonio Deriuab 
Author affiliations

* Corresponding authors

a Dipartimento di Fisica, Università degli Studi di Parma, viale G.P. Usberti 7/a, Parma, Italy

b CNISM, viale G.P. Usberti 7/a, Parma, Italy

c ISIS Facility, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, United Kingdom

d Institut Laue–Langevin, 6 rue Jules Horowitz, Grenoble Cedex 9, France

Abstract

We have performed a detailed analysis of the conformational and segmental dynamics in lipid-based vesicles using quasielastic neutron scattering. Our data evidence the presence of dynamical heterogeneities: the hydrogens in the headgroups and in the initial part of the hydrophobic chains perform slow diffusive motions in a confined volume; those belonging to the end part of the chains show a faster confined diffusivity together with torsional isomerization transitions. A model with three hydrogen populations has been proposed to describe the main features of this complex dynamics. The addition of a charged polysaccharide component to the vesicles mostly slows the dynamics of the headgroups and of the upper part of the acyl chains without significantly affecting the isomerization dynamics.

Graphical abstract: Conformational and segmental dynamics in lipid-based vesicles

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Publication details

The article was received on 11 Nov 2010, accepted on 14 Jan 2011 and first published on 18 Feb 2011


Article type: Paper
DOI: 10.1039/C0SM01301C
Citation: Soft Matter, 2011,7, 3929-3935
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    Conformational and segmental dynamics in lipid-based vesicles

    Y. Gerelli, V. G. Sakai, J. Ollivier and A. Deriu, Soft Matter, 2011, 7, 3929
    DOI: 10.1039/C0SM01301C

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