ISSN:
1435-1536
Keywords:
Monolayer
;
filmpotential
;
filmpressure
;
ioninteraction
;
filmcondensation
;
phospholipids
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 interaction of ions (Na+, K+, Li+, Ca2+) with monolayers of phosphatidic acid alkyl esters (alkyl = methyl, ethyl,n-propyl,n-pentyl) were investigated at the air/water interface on Tris-HCl buffer, as well as on the electrolytes containing subphases. Qualitatively it can be stated that there are no considerable interactions between Na+ ions in the substrate and the head groups of phosphatidic acid esters in the monolayers. On the whole, the modification of the shape in the π/a and Δv/a isotherms (π s = film pressure, Δv s = film potential) of the homologous phosphatidic acid esters as a function of the length of the ester group on the subphase containing NaCl, KCl, and LiCl corresponds to that on Tris-HCl buffer without admixture of electrolytes. On the other hand the strength of interaction between Ca2+ ions and the homologous phosphatidic acid esters depends on the length of the ester group. The “film-condensing effect” of Ca2+ ions becomes smaller with increasing length of the ester group.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00654124
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