高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (7): 1256.

• 论文 • 上一篇    下一篇

液晶态磷脂酰乙醇胺脂质体和LB膜结构的研究

孙润广, 张静   

  1. 陕西师范大学物理学与信息技术学院食品工程系, 西安 710062
  • 收稿日期:2002-06-03 出版日期:2003-07-24 发布日期:2003-07-24
  • 通讯作者: 孙润广(1958年出生),男,博士,教授,主要从事物理有机与生物物理的研究.E-mail:sunrun@pub.xaonline.com E-mail:sunrun@pub.xaonline.com
  • 基金资助:

    国家自然科学基金(批准号:20272035);国家教育部高等学校骨干教师资助计划(教技师2000-65)资助

Structure of Phosphatidylethanolamine Liposome and Langmuir-Blodgett Films in Liquid Crystalline State

SUN Run-Guang, ZHANG Jing   

  1. Department of Food Engineering, College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, China
  • Received:2002-06-03 Online:2003-07-24 Published:2003-07-24

摘要: 用原子力显微镜、小角X射线散射和31PNMR分别对液晶态磷脂酰乙醇胺脂质体和LB膜结构进行了研究.用原子力显微镜观察到了液晶态脂质体的立方相和双层膜共存的结构图像.研究结果表明,两相共存的状态与双亲性分子的结构、浓度以及介质的组分和pH等因素有关.用小角X射线散射和31PNMR研究发现,在DEPE液晶态中,钠盐诱导形成Q229(Im3m)立方相.DEPE液晶态分别在37.5℃出现Lβ→Lα可逆相变,在63.5℃出现Lα→H可逆相变.

关键词: 原子力显微镜, 小角X射线散射, 磷脂酰乙醇胺, 立方相, 脂双层膜

Abstract: The structure of phosphatidylethanolamine in Langmuir-Blodgett films and liposome in liquid crystalline state was investigated by means of the atomic force microscope(AFM), small angle X-ray scatting(SAXS) and 31P nuclear magnetism resonance( 31P NMR). By the atomic force microscope, some large and small lipid vesicles and a coexistent structure of cubic phase and bilayer phase of PE liposome were observed. The coexistent structure of the two phases is closely related to the structure of phospholipid, concentration, medium and pH. It was found that sodium salt solutes induce the formation of an Im3m(Q229) cubic phase in DEPE dispersions. The phase transition of DEPE with the change of temperature was investigated. The Lβ→Lα transitions are at 37.5 ℃ and the Lα→H transitions are at 63.5 ℃.

Key words: Atomic force microscope, Small angle X-ray scatting, Phosphatidylethanolamine, Cubic phase, Bilayer structure

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