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鞘氨醇/胆固醇单层分子膜的热力学特性及表面形态的AFM观测 被引量:8

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摘要 脂筏是近年来在生物膜研究中发现的一种富含鞘脂、胆固醇和特殊蛋白质的动态微区结构,其结构和功能的改变,会引发多种疾病.本文利用LB膜技术模拟脂筏的动态微区结构,通过测量表面压力与平均分子面积(π-A)曲线数据,计算出鞘氨醇/胆固醇LB单层膜的过量分子面积(πA(ex))、表面过量吉布斯自由能(ΔG(ex))、活度系数(f1和f2)以及弹性模量(Cs-1),系统的研究了二元组份混合单层膜的热力学特性,并用原子力显微镜对鞘氨醇与胆固醇混合膜的形态进行观察.热力学分析表明过量分子面积和过量吉布斯自由能相对理想状态都具有负偏差作用,这说明分子间相互作用表现为吸引力,且单层膜的稳定性、弹性模量和活度系数的数值明显的依赖于胆固醇与鞘氨醇的比例.AFM观察结果表明,纯鞘氨醇单分子膜表现为小的颗粒体结构;当鞘氨醇与胆固醇按不同摩尔比混合时,随着胆固醇摩尔比例的增加,混合膜呈现出从链状结构向较大的片层与网状共存结构的转化.最终纯胆固醇形成高度紧密的膜结构.AFM实验有力的支持了理论分析的结果.
出处 《中国科学(B辑)》 CSCD 北大核心 2008年第11期1018-1024,共7页 Science in China(Series B)
基金 国家自然科学基金项目(批准号:20772077) 教育部科学技术研究重点项目(批准号:104167)资助
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参考文献27

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共引文献24

同被引文献86

  • 1杨小乐,孙润广,张静.LB膜与AFM技术研究磷脂酰乙醇胺单分子膜结构[J].液晶与显示,2006,21(4):348-356. 被引量:11
  • 2邓穗平,欧阳健明.缺陷LB膜诱导草酸钙晶体的生长[J].化学学报,2007,65(8):683-687. 被引量:4
  • 3郝长春,孙润广.Langmuir-Blodgett膜超分子SM/DOPC/Chol三元脂系的原子力显微镜观察[J].化学学报,2007,65(20):2325-2330. 被引量:7
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