脂質/雙鏈陽離子型界面活性劑所形成之Langmuir單分子層及液胞的特性分析

謝侑穎

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脂質/雙鏈陽離子型界面活性劑所形成之Langmuir單分子層及液胞的特性分析

Characterization of the Langmuir monolayers and vesicles composed of a lipid with a two-tailed cationic surfactant

謝侑穎 , Masters　　Advisor：張鑑祥　　

繁體中文

氣/液界面；單分子層； DSPC ； DHDAB ； vesicle ； monolayer ； BAM

Abstract │ Reference (65) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

This study investigated the mixed monolayer behavior of L-α-distearoyl phosphatidylcholine/dihexadecyl- dimethylammonium (DSPC/DHDAB) at the air/liquid interface by using the Langmuir trough technique and Brewster angle microscopy. Moreover, the physical stability and the bilayer fluidity of DSPC/DHDAB vesicles were investigated by the size and zeta potential measurements with the fluorescence polarization analysis.
  The monolayer isotherms indicated that DSPC and DHDAB were miscible at the air/water interface, and the thermodynamic analysis suggested that the mixed monolayer with XDSPC=0.7 had the best stability. In addition, the relaxation curves obtained at a constant surface pressure of 30mN/m implied that the mixed monolayers containing more DSPC were more stable. The BAM images demonstrated that the difference in the molecular interaction in various mixed monolayers resulted in the variations of monolayer morphology. For the DSPC/DHDAB vesicles prepared in water, the best physical stability was found for the vesicles with XDSPC=0.5. However, the zeta potential of the vesicles did not change significantly with the increase in XDHDAB. Furthermore, the fluorescence polarization analysis indicated that the most pronounced molecular interaction in the bilayer structures was found for the vesicles with XDSPC = 0.5.
  For the mixed DSPC/DHDAB monolayers spread at the interface of air/phosphate buffer solution (PBS), the thermodynamic analysis suggested that DSPC and DHDAB were miscible at the interface, and the absolute value of the free energy change of mixing was less than that found at the air/water interface. However, the relaxation curves obtained at a constant surface pressure of 30mN/m indicated that the DHDAB-rich monolayers at the air/PBS interface had better stability than that at the air/water interface. Moreover, the poor physical stability was always found for the DSPC/DHDAB vesicles prepared in the PBS.

Reference ( 65 ) 〈TOP〉

Angelova, A., Vollhard, D., and Ionov, R., “2D-3D transformations of amphiphilic monolayers influences by intermolecular interactions: A Brewster angle microscopy study,” J. Phys. Chem., 100, 10710, 1996.
連結：
Armengol, X., and Estelrichl, J., “Physical stability of different liposome compositions obtained by extrusion method,” J. Microencapsulation, 12, 525, 1995.
連結：
Cadenhead, D.A., and Müller-Landau, F., “Molecular accommodation and molecular interactions in mixed insoluble monomolecular films,” J. Colloid Interface Sci., 78, 269, 1980.
連結：
Carrion, F., Maza, A., and Parra, J.L., “The influence of ionic strength and lipid bilayer charge on the stability of liposomes,” J. Colloid Interface Sci., 167, 78, 1994.
連結：
Chou, T.H., and Chu, I.M., ” Behavior of DSPC/DSPE-PEG2000 mixed monolayers at the air/water interface” Colloids and Surfaces A, 211, 267-274, 2002
連結：

Times Cited (1) 〈TOP〉

杜承霖(2012)。白蛋白對含雙鏈陽離子型界面活性劑之陰陽離子液胞物化特性的影響。成功大學化學工程學系學位論文。2012。1-248。

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