X-Ray Reflectometry of DMPS Monolayers on a Water Substrate


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The molecular structure of dimyristoyl phosphatidylserine (DMPS) monolayers on a water substrate in different phase states has been investigated by X-ray reflectometry with a photon energy of ~8 keV. According to the experimental data, the transition from a two-dimensional expanded liquid state to a solid gel state (liquid crystal) accompanied by the ordering of the hydrocarbon tails C14H27 of the DMPS molecule occurs in the monolayer as the surface pressure rises. The monolayer thickness is 20 ± 3 and 28 ± 2 Å in the liquid and solid phases, respectively, with the deflection angle of the molecular tail axis from the normal to the surface in the gel phase being 26° ± 8°. At least a twofold decrease in the degree of hydration of the polar lipid groups also occurs under two-dimensional monolayer compression. The reflectometry data have been analyzed using two approaches: under the assumption about the presence of two layers with different electron densities in the monolayer and without any assumptions about the transverse surface structure. Both approaches demonstrate satisfactory agreement between themselves in describing the experimental results.

作者简介

A. Tikhonov

Kapitza Institute for Physical Problems

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Email: tikhonov@kapitza.ras.ru
俄罗斯联邦, ul. Kosygina 2, Moscow, 119334

V. Asadchikov

Shubnikov Institute of Crystallography, “Crystallography and Photonics” Federal Research Center

Email: tikhonov@kapitza.ras.ru
俄罗斯联邦, Leninskii pr. 59, Moscow, 119333

Yu. Volkov

Shubnikov Institute of Crystallography, “Crystallography and Photonics” Federal Research Center

Email: tikhonov@kapitza.ras.ru
俄罗斯联邦, Leninskii pr. 59, Moscow, 119333

B. Roshchin

Shubnikov Institute of Crystallography, “Crystallography and Photonics” Federal Research Center

Email: tikhonov@kapitza.ras.ru
俄罗斯联邦, Leninskii pr. 59, Moscow, 119333

Yu. Ermakov

Frumkin Institute of Physical Chemistry and Electrochemistry

Email: tikhonov@kapitza.ras.ru
俄罗斯联邦, Leninskii pr. 31, Moscow, 119071

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