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首页> 外文期刊>Applied Surface Science >Studies on behaviors of dipalmitoylposphatidylcholine and bilirubin in mixed monolayer at the air/water interface
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Studies on behaviors of dipalmitoylposphatidylcholine and bilirubin in mixed monolayer at the air/water interface

机译：空气/水界面混合膜中二棕榈酰磷脂酰胆碱和胆红素的行为研究

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摘要

Mixed monolayers of dipalmitoylposphatidylcholine (DPPC) and bilirubin (BR) were prepared on different subphases. The properties of DPPC/BR monolayer, such as collapse pressure (pi(coll)) limiting area per molecule (A(lim)), surface compressibility modulus, free energy (Delta G(mix)) and excess free energy (Delta G(ex)) were investigated based on the analysis of the surface pressure-area isotherms on pure water. The results showed that DPPC and BR were miscible and formed non-ideal mixed monolayers at the air/water interface. With the molar fraction of BR (X-BR) increasing, the LE-LC coexistence region of DPPC monolayer was eliminated gradually. The DPPC/BR complex (MD-B) Of 1:2 stoichiometry formed as a result of the strong hydrogen bonds between the polar groups of DPPC and BR. The studies of effects of pH values and calcium ions in subphase on the DPPC/BR monolayers showed that the mixed monolayer became expanded on alkali aqueous solution and on 1 mmol/L CaCl2 aqueous solution. The orientation of DPPC and BR at air/water interface was also discussed. (c) 2005 Elsevier B.V. All rights reserved.
机译：在不同的亚相上制备了二棕榈酰磷脂酰胆碱（DPPC）和胆红素（BR）的混合单层。 DPPC / BR单层的性质，例如每个分子的崩解压力（pi（coll））极限面积（A（lim）），表面压缩模量，自由能（Delta G（mix））和过量自由能（Delta G（ ex））是根据纯水表面压力-面积等温线的分析进行研究的。结果表明，DPPC和BR可混溶并在空气/水界面形成非理想的混合单层。随着BR（X-BR）的摩尔分数的增加，DPPC单层的LE-LC共存区域逐渐被消除。化学计量比为1：2的DPPC / BR配合物（MD-B）是由于DPPC和BR的极性基团之间的强氢键形成的。研究了亚相中pH值和钙离子对DPPC / BR单层的影响，结果表明混合单层在碱性水溶液和1 mmol / L CaCl2水溶液上膨胀。还讨论了DPPC和BR在空气/水界面处的取向。 （c）2005 Elsevier B.V.保留所有权利。

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