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Adsorption Kinetics of DPPG Liposome Layers: A Quantitative Analysis of Surface Roughness

Published online by Cambridge University Press:  07 June 2013

Andreia A. Duarte ,
Sérgio L. Filipe ,
Luís M.G. Abegão ,
Paulo J. Gomes ,
Paulo A. Ribeiro  and
Maria Raposo
Andreia A. Duarte
Affiliation:
Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Sérgio L. Filipe
Affiliation:
Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Luís M.G. Abegão
Affiliation:
Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Paulo J. Gomes
Affiliation:
Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Paulo A. Ribeiro
Affiliation:
Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
Maria Raposo*
Affiliation:
Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia (FCT), Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
*
*Corresponding author. E-mail: mfr@fct.unl.pt
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Abstract

Roughness of a positively charged poly(allylamine hydrochloride) (PAH) polyelectrolyte surface was shown to strongly influence the adsorption of 1.2-dipalmitoyl-sn-3-glycero-[phosphorrac-(1-glycerol)] (DPPG) liposomes on it. The adsorption kinetic curves of DPPG liposomes onto a low-roughness PAH layer reveal an adsorbed amount of 5 mg/m2, pointing to liposome rupture, whereas a high-roughness surface leads to adsorbed amounts of 51 mg/m2, signifying adsorption of intact liposomes. The adsorption kinetic parameters calculated from adsorption kinetic curves allow us to conclude that the adsorption process is due to electrostatic interactions and also depends on processes such as diffusion and reorganization of lipids on the surface. Analysis of the roughness kinetics enabled us to calculate a growth exponent of 0.19 ± 0.07 and a roughness exponent of around 0.84, revealing that DPPG liposomes adsorbed onto rough surfaces follow the Villain self-affine model. By relating self-affine surfaces with hydrophobicity, the liposome integrity was explained by the reduction in the number of water molecules on the PAH surface, contributing to counterion anchorage near PAH ionic groups, reducing the liposome/PAH layer electrostatic forces and, consequently, avoiding liposome rupture.

Keywords

layer by layerliposomequartz crystal microbalanceatomic force microscopy
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 4 , August 2013 , pp. 867 - 875
Copyright
Copyright © Microscopy Society of America 2013 

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