Abstract:
:We have investigated monomolecular fluid-like films of palmitoyl oleoylphosphatidyl lipids with choline, glycerol and serine head groups, respectively. Conventional Langmuir trough experiments have been evaluated towards a thermodynamic analysis applying a novel approach that was recently developed in this laboratory. Our work involves elaborate efforts to exclude possible error sources of the basic measuring parameters. By means of pertinent mass conservation plots it could then be shown that the present lipids form a practically insoluble monolayer. Relative deviations of the lateral pressure from its ideal (gaseous) value are seen to be a very pronounced linear function of the surface concentration (between 1 and about 35 mN/m). They reveal a clearly manifested Boyle point around 4 mN/m, indicating formation of aggregates in the very low pressure range. The results are discussed in terms of a rather simple quantitative formulation of the underlying equation of state including fit curves of the related partial molecular area and Gibbs free energy.
journal_name
Chem Phys Lipidsjournal_title
Chemistry and physics of lipidsauthors
Weis I,Welzel PB,Bähr G,Schwarz Gdoi
10.1016/s0009-3084(99)00129-2subject
Has Abstractpub_date
2000-03-01 00:00:00pages
1-8issue
1eissn
0009-3084issn
1873-2941pii
S0009-3084(99)00129-2journal_volume
105pub_type
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