The Equilibria Between Monovalent Ions and Phosphatidylcholine Monolayer at the Air/Water Interface |
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| Authors: | Aneta D Petelska Zbigniew A Figaszewski |
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| Institution: | 1. Institute of Chemistry, University in Bialystok, Al. J. Pilsudskiego 11/4, 15-443, Bialystok, Poland
2. Laboratory of Electrochemical Power Sources, Faculty of Chemistry, University of Warsaw, Pasteur St. 1, 02-093, Warsaw, Poland
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| 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+). |
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