ISSN:
1435-1536
Keywords:
Phosphttidyl choline
;
lecithin
;
sodium deoxycholate
;
surface pressure
;
insoluble monolayer
;
adsorbed monolayer
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The surface pressure vs. mokcular surface area relations for dipalmitoyl phosphatidylcholine (DPPC) insoluble monolayer and sodium deoxycholate (SDC) adsorbed monolayer,L and D1, respectively, were obtained from the analyses of surface tensions measured by the Wilhelmy glass plate. Also, D1 was obtained by a drop-weight method. Next, the surface pressure time course,π(t), of the SDC aq. was measured by the Wilhelmy plate before and after DPPC was spread on the liquid surface. At DPPC spreading,π(t) jumped to a maximum,π′, and decreased along an exponential curve. The values ofπ′ with various surface amounts of DPPC and bulk concentrations of SDC were analyzed using a dual surface-region model. The model enabled the estimation ofπ′. For better fitting, modified relations were constructed in place of D1. The exponential decrease ofπ(t) was also observed on the SDC adsorbed monolayer which was rapidly compressed by a moving barrier. Theπ(t) relaxation rate constants of the SDC monolayers which were compressed by DPPC spreading and the moving barrier agreed with each other, suggesting a desorption of SDC from the surface.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01410388
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