Preparation and Characterization of Phase-Segregated Vesicles of Photopolymerizable Diacetylene Mixed with Nonpolymerizable Amphiphiles
作者:Jin Matsumoto、Koshiro Yoneda、Jun Tasaka、Tsutomu Shiragami、Masahide Yasuda
DOI:10.1246/bcsj.20100192
日期:2010.12.15
A mixture of sodium 1,2-di(hexadecyloxycarbonyl)ethanesulfonate (2C16S) with photopolymerizable 1,2-di(10,12-tricosadiynoyl)-sn-glycerol 3-phosphocholine (DTPC) in a 2:100 ratio was treated by modified thin-film hydration to give an aggregate which became polymerized giant vesicles (GVs) under irradiation at 254 nm. The autofluorescence of the GVs was analyzed with a confocal laser scanning microscope at the cross section, revealing a 3.8-µm diameter ring shape and the presence of a dark part of ca. 1 µm in the ring. When octadecylrhodamine B (RhB) as an amphiphilic fluorescence probe was added to the GV, the fluorescence of RhB was emitted from the whole ring. Therefore, phase segregation of 2C16S from DTPC was confirmed. Similarly, mixed vesicles of N,N-di(2-hexadecanoyloxyethyl)dimethylammonium iodide with DTPC were found to be 3.7-µm diameter phase-segregated vesicles with a dark portion of ca. 1 µm on the ring in the cross sectional image. On the other hand, DTPC vesicles mixed with 1,2-di(dodecyloxycarbonyl)ethanesulfonate, N,N-di(2-dodecanoyloxyethyl)dimethylammonium iodide, and N,N-di(2-tetradecanoyloxyethyl)dimethylammonium iodide formed sphere structures filling the inside of the vesicles. The segregation mechanism was explained by the difference in the main phase transition temperature of each amphiphile.
将 1,2-二(十六烷氧基羰基)乙烷磺酸钠(2C16S)与可光聚合的 1,2-二(10,12-三缩水甘油酰)-sn-甘油 3-磷酸胆碱(DTPC)按 2:100 的比例混合,通过改良薄膜水合法处理,得到一种聚合体,在 254 纳米波长的照射下,聚合体变成了巨囊(GVs)。用激光共聚焦扫描显微镜分析了 GVs 横截面上的自发荧光,发现其呈直径为 3.8 微米的环形,环内存在约 1 微米的暗色部分。当十八烷基罗丹明 B(RhB)作为两亲性荧光探针加入龙胆紫时,RhB 的荧光从整个环中发射出来。因此,2C16S 与 DTPC 的相分离得到了证实。同样,在 N,N-二(2-十六碳酰氧基乙基)二甲基碘化铵与 DTPC 的混合囊泡中发现,相分离囊泡的直径为 3.7 微米,在横截面图像中,环上有约 1 微米的暗色部分。另一方面,与 1,2-二(十二烷氧基羰基)乙磺酸盐、N,N-二(2-十二烷酰氧乙基)二甲基碘化铵和 N,N-二(2-十四烷酰氧乙基)二甲基碘化铵混合的 DTPC 囊泡形成了球状结构,充满了囊泡内部。每种双亲化合物主要相变温度的差异解释了分离机制。