Control of Permeation of Lanthanide Ions Across Phosphate-Functionalized Liposomal Membranes
作者:Paolo Scrimin、Paolo Tecilla、Robert A. Moss、Kathryn Bracken
DOI:10.1021/ja972041+
日期:1998.2.1
unable to permeate across the bilayer. The exovesicular specificity disappears when the cleavage is performed above the phase transition temperature of the vesicles not because of facilitated permeation of the cations but because of the increased rate of flip-flop of the lipid. Addition of lipophilic amines (N-hexadecyl-N,N‘,N‘-trimethylethylenediamine, TMED C16; N-hexadecylhistamine, C16-His, hexadecylamine
已经通过超声处理和挤压制备了阴离子、磷酸盐功能化脂质 1(DPGPNP、1,2-二-O-十六酰基-rac-甘油基对硝基苯基磷酸钠盐)的单层囊泡。磷酸盐头部基团在 pH 7 时水解稳定,但可以在 25°C 下通过向预形成的聚集体添加镧系元素 (III) 阳离子而在外表面特异性裂解,这些阳离子无法渗透穿过双层。当裂解在囊泡的相变温度以上进行时,外囊泡特异性消失,这不是因为促进了阳离子的渗透,而是因为脂质的触发器速率增加。添加亲脂胺(N-十六烷基-N,N',N'-三甲基乙二胺,TMED C16;N-十六烷基组胺,C16-His,十六烷基胺,C16NH2),并且在较小程度上,阳离子表面活性剂十六烷基三甲基溴化铵 CTABr 诱导外切囊泡中剩余脂质部分的裂解。添加剂影响通透性...