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A quantitative determination of lipid bilayer deposition efficiency using AFM.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Milan, David C 
Casford, Michael TL 

Abstract

The efficacy of a number of different methods for depositing a dimyristoylphosphatidylcholine (DMPC) lipid bilayer or DMPC-cholesterol (3 : 1) mixed bilayer onto a silicon substrate has been investigated in a quantitative manner using atomic force microscopy (AFM) image analysis to extract surface coverage. Complementary AFM-IR measurements were used to confirm the presence of the lipids. For the Langmuir-Blodgett/Schaefer deposition method at temperatures below the chain-melting transition temperature (T m), a large number of bilayer defects resulted when DMPC was deposited from a water subphase. Addition of calcium ions to the trough led to smaller, more frequent defects, whereas addition of cholesterol to the lipid mixture led to a vast improvement in bilayer coverage. Poor coverage was achieved for deposition at temperatures above T m. Formation of the deposited bilayer from vesicle fusion proved a more reliable method for all systems, with formation of near-complete bilayers within 60 seconds at temperatures above T m, although this method led to a higher probability of multilayer formation and rougher bilayer surfaces.

Description

Keywords

34 Chemical Sciences

Journal Title

RSC Adv

Conference Name

Journal ISSN

2046-2069
2046-2069

Volume Title

11

Publisher

Royal Society of Chemistry (RSC)
Sponsorship
Leverhulme Trust (RPG-2016-158)