Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (21): 1939-1943.
YAO Ya-Li, ZENG Zuo-Xiang*, XUE Wei-Lan, HUANG Shun-De
Based on the available surface state equation for phospholipid monolayers, a generalized equation was derived by introducing a third parameter—comparative expanding factor. It was supposed that the phospholipid monolayer surface characteristics have the close relation with not only the interaction between lipid intermolecules, but also the interaction between subsolution molecules and lipid ones. Therefore the third parameter—comparative expanding factor was defined as the ratio of the two interactions. Associating the reduced temperature Tr (based on the phase transition temperature Tc) and the reduced molecular area Ar (based on the molecular area of the liquid condensed film Ac) with the third parameter, the surface state equation was generalized to relate the π-A isotherm data of 1,2-dimyristoyl-sn-glycero-3-phosphocho- line, 1,2-dimyristoyl-sn-glycero-3-phosphatidic acid, and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine with small errors. The results show that the generalized state equation could describe the surface characteristics of phospholipid monolayer during the expansion-compression circulation, and the data of the third parameter might reflect the rates of different phospholipids expanding to monolayers.
YAO Ya-Li, ZENG Zuo-Xiang*, XUE Wei-Lan, HUANG Shun-De. Generalization of Surface State Equation for Phospholipid Monolayer[J]. Acta Chimica Sinica, 2005, 63(21): 1939-1943.
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