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1 2008

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The Equilibrium of Phosphatidylcholine-Sphingomyelin in a Monolayer at the Air/Water Interface

Petelska A. D., Naumowicz M., Figaszewski Z. A.

Polish Journal of Chemistry

2008

Vol. 82, nr 12

2323-2330

Monolayers of either phosphatidylcholine (PC) or sphingomyelin (SM) or their mixtures (PC-SM) were investigated at the air/water interface. The surface tension values of pure and mixed monolayers were used to calculate the pi-A isotherms. The theory of equilibrium between components of monolayers at the air/water interface has been developed in order to obtain the stability constant of the PC-SM complex. We considered the equilibrium between PC, SM and the PC-SM complex on the basis of derived equations. We established that phosphatidylcholine and sphingomyelin formed a 1:1 complex, with the stability constant equal to KAB = 3.20x105 m2 mol-1.