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Title: Interaction of graphene nanoparticles and lipid membranes displaying different liquid ordering: a molecular dynamics study
Author: Puigpelat Rubio, Elle
Ignés i Mullol, Jordi
Sagués i Mestre, Francesc
Reigada Sanz, Ramon
Keywords: Grafè
Bicapes lipídiques
Dinàmica molecular
Lipid bilayers
Molecular dynamics
Issue Date: 21-Nov-2019
Publisher: American Chemical Society
Abstract: Understanding the effects of graphene-based nanomaterials on lipid membranes is fundamental to determine their environmental impact and the efficiency of their biomedical use. By means of molecular dynamics simulations of simple model lipid bilayers, we analyse in detail the different interaction modes. We have studied bilayers consisting of lipid species (including cholesterol) which display different internal liquid ordering. Nanometric graphene layers can be transiently adsorbed onto the lipid membrane and/or inserted in its hydrophobic region. Once inserted, graphene nanometric flakes display a diffusive dynamics in the membrane plane, they adopt diverse orientations depending on their size and oxidation degree, and they show a particular aversion to be placed close to cholesterol molecules in the membrane. Addition of graphene to phase-segregated ternary membranes is also investigated in the context of the lipid raft model for the lipid organization of biological membranes. Our simulation results show that graphene layers can be inserted indistinctly in the ordered and disordered regions. Once inserted, nanometric flakes migrate to disordered and cholesterol-poor lipid phases.
Note: Versió postprint del document publicat a:
It is part of: Langmuir, 2019, vol. 35, num. 50, p. 1661-1668
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ISSN: 0743-7463
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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