作者:Amar B. T Ghisaidoobe、Wan Soo Yun、Sang J Chung
DOI:10.1166/jnn.2016.13610
日期:2016.11.1
To discover novel liposomes with increased stability, we set out to explore the self-assembly of nonionic surfactants bearing two asymmetric lipid chains and a polyethylene glycol unit. Utilizing glutamic acids as the scaffold, a row of amphiphilic derivatives were synthesized with different alkyl chains attached to both, the α- and γ-carboxylic acids. Subsequently, the amine of the resulting glutamic acid derivatives was functionalized with polyethylene glycol composed of 4 and 20 ethylene glycol units. Utilizing the newly synthesized amphiphiles, stable and homogeneous lipid nanoparticles with an average size of about 120 nm were obtained. The critical micelle concentration, which was determined via the pyrene fluorescence assay, was found to be about 10 μM. Subsequently, the lipid nanoparticles were loaded with the FDA approved fluorescein dye and excess dye was removed by size exclusion chromatography. The resulting lipid nanoparticles could be stored for three months at room temperature without observable deteriorations. Furthermore, preliminary results indicate that the lipid nano-particles derived from glutamic acid could be generated using human serum as the medium without noticeable differences in comparison with phosphate buffer.
为了发现稳定性更高的新型脂质体,我们开始探索带有两条不对称脂质链和一个聚乙二醇单元的非离子表面活性剂的自组装。我们以谷氨酸为支架,合成了一系列两亲性衍生物,α-和γ-羧酸上都附有不同的烷基链。随后,由 4 个和 20 个乙二醇单元组成的聚乙二醇对谷氨酸衍生物的胺进行了官能化。利用新合成的双亲化合物,获得了平均尺寸约为 120 纳米的稳定、均质的脂质纳米粒子。通过芘荧光测定法确定的临界胶束浓度约为 10 μM。随后,在脂质纳米颗粒中加入经 FDA 批准的荧光素染料,并通过尺寸排阻色谱法去除多余的染料。制得的脂质纳米粒子可在室温下保存三个月而不会出现明显的变质。此外,初步结果表明,以人血清为介质可生成谷氨酸脂质纳米颗粒,与磷酸盐缓冲液相比没有明显差异。