DSPC/DLPC Mixed Films Supported on Silica: A QCM-D and Friction Force Study
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概要
- 論文の詳細を見る
The membrane properties of phospholipid mixtures supported on silica were studied by means of a quartz crystal microbalance with dissipation monitoring (QCM-D) technique, in situ soft-contact atomic force microscopy (AFM), and friction force microscopy (FFM). The phospholipids used in this study were di-stearoylphosphatidylcholine (DSPC) and dilauroylphosphatidylcholine (DLPC). The phospholipid films were prepared by a vesicle-fusion method, in which DSPC/DLPC mixed liposomes dispersed in an aqueous medium are adsorbed on silica and their structure is transformed into a bilayer on the substrate. The changes in QCM-D (frequency and dissipation) and friction responses of DSPC single systems (gel state at 25°C) are relatively large compared with those of DLPC single systems (liquid-crystalline state at 25°C) and those of mixed DSPC/DLPC systems. This suggests that (i) the gel-state DSPC liposomes are somewhat flattened on the silica, by keeping their solid-like molecular rigidity, whereas (ii) both the liquid-crystalline DLPC and mixed liposomes experience instantaneous structural transformation at the silica/water interface and form a normally flattened bilayer on the substrate. The friction force response is dependent on the phase state of the phospholipids, and the liquid-crystalline DLPC has a more significant impact on the overall membrane properties (i.e., the degree of swelling and the friction response on the surface) than does the gel-state DSPC.
著者
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ABE Masahiko
Department of Internal Medicine, Hokkaido Prefectural Haboro Hospital
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酒井 秀樹
東京理科大学理工学部工業化学科
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Sakai Kenichi
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Sci
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Sakai Hideki
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Sci
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Shibata Hirobumi
Department Of Materials Science And Technology Faculty Of Industrial Science And Technology Tokyo Un
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Sakai Hideki
Dep. Of Pure And Applied Chemistry Fac. Of Sci. And Technol. Tokyo Univ. Of Sci.
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Sakai Hideki
Department Of Pharmaceutical Physiology Graduate School Of Medicine And Pharmaceutical Sciences Univ
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Abe Masahiko
Department Of Internal Medicine Hokkaido Prefectural Haboro Hospital
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Sakai Kenichi
Department Of Mathematical And Life Sciences Graduate School Of Science Hiroshima University
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Ogura Taku
Faculty Of Science And Technology Tokyo University Of Science
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Oguchi Takakuni
Department of Pure and Applied Chemistry in Faculty of Science and Technology and Research Institute
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Sakai Hideki
Department Of Nephro-urology Nagasaki University Graduate School Of Biomedical Sciences
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Ohkubo T
Faculty Of Science And Technology Tokyo University Of Science
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Sakai Hideki
Department of Industrial Chemistry, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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Oguchi Takakuni
Department of Pure and Applied Chemistry in Faculty of Science and Technology and Research Institute for Science and Technology, Tokyo University of Science
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Sakai Kenichi
Department of Pure and Applied Chemistry in Faculty of Science and Technology and Research Institute for Science and Technology, Tokyo University of Science
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