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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Toca-Herrera, José Luis Krasteva, Nadejda Müller, Hans-Joachim Krastev, Rumen |
| Description | Country affiliation: Austria Author Affiliation: Toca-Herrera JL ( Institute for Biophysics, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna (BOKU), Muthgasse 11, Vienna, Austria.); Krasteva N ( Baldungstr, 70736 Fellbach, Germany.); Müller HJ ( Max-Planck Institute of Colloids and Interfaces, 14424 Golm/Potsdam, Germany.); Krastev R ( NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany) |
| Abstract | The interaction between lipid bilayers in water has been intensively studied over the last decades. Osmotic stress was applied to evaluate the forces between two approaching lipid bilayers in aqueous solution. The force-distance relation between lipid mono- or bilayers deposited on mica sheets using a surface force apparatus (SFA) was also measured. Lipid stabilised foam films offer another possibility to study the interactions between lipid monolayers. These films can be prepared comparatively easy with very good reproducibility. Foam films consist usually of two adsorbed surfactant monolayers separated by a layer of the aqueous solution from which the film is created. Their thickness can be conveniently measured using microinterferometric techniques. Studies with foam films deliver valuable information on the interactions between lipid membranes and especially their stability and permeability. Presenting inverse black lipid membrane (BLM) foam films supply information about the properties of the lipid self-organisation in bilayers. The present paper summarises results on microscopic lipid stabilised foam films by measuring their thickness and contact angle. Most of the presented results concern foam films prepared from dispersions of the zwitterionic lipid 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC) and some of its mixtures with the anionic lipid -- 1,2-dimyristoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] (DMPG). The strength of the long range and short range forces between the lipid layers is discussed. The van der Waals attractive force is calculated. The electrostatic repulsive force is estimated from experiments at different electrolyte concentrations (NaCl, CaCl2) or by modification of the electrostatic double layer surface potential by incorporating charged lipids in the lipid monolayers. The short range interactions are studied and modified by using small carbohydrates (fructose and sucrose), ethanol (EtOH) or dimethylsulfoxide (DMSO). Some results are compared with the structure of lipid monolayers deposited at the liquid/air interface (monolayers spread in Langmuir trough), which are one of most studied biomembrane model system. The comparison between the film thickness and the free energy of film formation is used to estimate the contribution of the different components of the disjoining pressure to the total interaction in the film and their dependence on the composition of the film forming solution. |
| File Format | HTM / HTML |
| ISSN | 00018686 |
| Volume Number | 207 |
| e-ISSN | 18733727 |
| Journal | Advances in Colloid and Interface Science |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-05-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Chemistry Lipid Bilayers Chemistry Models, Chemical Viscoelastic Substances Algorithms Chemical Phenomena Hydrophobic And Hydrophilic Interactions Static Electricity Surface Properties Journal Article Research Support, Non-u.s. Gov't Review |
| Content Type | Text |
| Resource Type | Article |
| Subject | Colloid and Surface Chemistry Physical and Theoretical Chemistry Surfaces and Interfaces |
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