title: The equilibria between monovalent ions and phosphatidylcholine monolayer at the air/water interface.
abstract: The effect of monovalent ion (Li⁺, Na⁺, Cs⁺) interaction with monolayers of phosphatidylcholine (lecithin, PC) was investigated at the air/water interface. We present surface tension measurements of lipid monolayers obtained using a Langmuir method as a function of monovalent ion concentration. Measurements were carried out at 22 °C using a Teflon trough and a Nima 9000 tensiometer. Interactions between lecithin and monovalent ions result in significant deviations from the additivity rule. An equilibrium theory to describe the behavior of monolayer components at the air/water interface was developed in order to obtain the stability constants and area occupied by one molecule of PC-monovalent ion complexes (PC⁻Me⁺).
authors.affiliation: Institute of Chemistry, University in Bialystok, Al. J. Pilsudskiego 11/4, 15-443 Bialystok, Poland. aneta@uwb.edu.pl
authors.forename: Aneta D
authors.initials: AD
authors.lastname: Petelska
authors.forename: Zbigniew A
authors.initials: ZA
authors.lastname: Figaszewski
mesh_terms: D002414:Cations, Monovalent / Q000737:chemistry*; D054709:Lecithins / Q000737:chemistry*; D008672:Metals, Alkali / Q000737:chemistry*; D053835:Unilamellar Liposomes / Q000737:chemistry*
chemical_list: D002414:Cations, Monovalent; D054709:Lecithins; D008672:Metals, Alkali; D053835:Unilamellar Liposomes