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Effects of Calcium Ions on Thermodynamic Properties of Mixed Bilirubin/Cholesterol Monolayers
Qiong Wu,Yu-feng Tang,Ye-min Li,An-jian Xie,Yu-hua Shen*,Jin-miao Zhu,Chuan-hao Li
Author NameAffiliationE-mail
Qiong Wu Department of Science and Technology, Anqing Teachers College, Anqing 246011, China; School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China  
Yu-feng Tang School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China  
Ye-min Li School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China  
An-jian Xie Department of Science and Technology, Anqing Teachers College, Anqing 246011, China; School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China  
Yu-hua Shen* Department of Science and Technology, Anqing Teachers College, Anqing 246011, China; School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China s_yuhua@163.com 
Jin-miao Zhu School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China  
Chuan-hao Li School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China  
Abstract:
The mixed monolayer behavior of bilirubin/cholesterol was studied through surface pressure-area (?-A) isotherms on aqueous solutions containing various concentrations of calcium ions. Based on the data of ?-A isotherms, the mean area per molecule, collapse pressure, surface compressibility modulus, excess molecular areas, free energy of mixing, and excess free energy of mixing of the monolayers on different subphases were calculated. The results show an expansion in the structure of the mixed monolayer with Ca2+ in subphase, and non-ideal mixing of the components at the air/water interface is observed with positive deviation from the additivity rule in the excess molecular areas. The miscibility between the components is weakened with the increase of concentration of Ca2+ in subphase. The facts indicate the presence of coordination between Ca2+ and the two components. The mixed monolayer, in which the molar ratio of bilirubin to cholesterol is 3:2, is more stable from a thermodynamic point of view on pure water. But the stable 3:2 stoichiometry complex is destroyed with the increase of the concentration of Ca2+ in subphase. Otherwise, the mixed monolayers have more thermodynamic stability at lower surface pressure on Ca2+ subphase.
Key words:  Bilirubin/cholesterol, Mixed monolayer, Calcium ion, Thermodynamic property, Air/waterinterface
FundProject:国家自然科学基金
Effects of Calcium Ions on Thermodynamic Properties of Mixed Bilirubin/Cholesterol Monolayers
吴琼,唐宇峰,厉业敏,谢安建,沈玉华*,朱金苗,李传浩
摘要:
通过?-A等温线研究了含钙离子浓度不同的水溶液亚相上胆红素/胆固醇混合单分子膜的性质.在此基础上,采用数学方法计算了不同亚相上单分子膜的平均单分子面积、崩溃压、表面压缩系数、超额单分子面积、混合自由能和超额自由能.结果表明,在钙离子溶液亚相上混合单分子膜的结构发生扩张,并且在界面上形成非理想混合单分子膜.与理想混合时相比,这种混合单分子膜在超额单分子面积上表现为明显的正偏差.在纯水亚相上,胆红素与胆固醇的摩尔比为3:2时混合单分子膜为热力学最稳定体系.但是在钙离子浓度逐渐增大的亚相中,这种摩尔比的混合单分子膜热力学稳定性被破坏,即混合单分子膜中的不同组分间自发混合能力下降,这是由于受到钙离子与胆红素和胆固醇之间配位作用的影响.此外,在钙离子溶液亚相中,在较低的表面压下制备出的混合膜具有更好的热力学稳定性.
关键词:  胆红素/胆固醇,混合单分子膜,钙离子,热力学性质,气-液界面
DOI:10.1088/1674-0068/21/02/156-162
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