用原子力显微镜研究磷脂酸Langmuir-Blodgett双层膜中超分子结构  

Atomic Force Microscopic Observation of Local Supramolecular Structure in Phosphatidic Acid Langmuir-Blodgett Films

作　　者：袁春波[1] 丁德胜[1] 顾宁[1] 陆祖宏 刘举正[1] 

机构地区：[1]东南大学化学系,南京210096

出　　处：《高等学校化学学报》1997年第5期791-794,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：用原子力显微镜研究了二棕榈酰磷脂酸（DPPA）双层LB膜的分子排列结构，发现DPPA双层膜的分子排列具有长程的位置和取向有序，为有序六方结构；同时，在DPPA双层膜的极性区磷酸基团间存在局域超分子结构．The Langmuir-Blodgett bilayer films of phosphatidic acid(DPPA) have been in vestigated by using atomic force microscopy in both large and nano-scale. Large scale AFM image shows that the bilayer of DPPA is a plane film with some defects which enable us to detect the thickness of bilayer by a trace of section analysis across the defects structure.Molecularly resolved images show that the polar head groups (phosphate groups) are packed in an ordered hexagonal organization with a long range orientational and positional ordering.Intermolecular hydrogen bonding interactions between adjacent phosphate groups are first visualized and local supramolecular structures are first observed in polar region of DPPA bilayer. Some phosphate groups in polar region linked with each other through intermolecular hydrogen bonding interaction to form local supramolecular structure with a diameter of 1. 5 nm in size.

关 键 词：超分子 磷脂酸 原子力显微镜 LB膜 AFM DPPA 

分 类 号：Q545[生物学—生物化学]