Self-assembly in escin-nonionic surfactant mixtures: From micelles to vesicles.
Self-assembly in escin-nonionic surfactant mixtures: From micelles to vesicles.
复制标题
七叶皂苷-非离子表面活性剂混合物中的自组装：从胶束到囊泡。
DOI：
10.1016/j.jcis.2022.06.122
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发表时间：
2022
影响因子：
9.9
通讯作者：
Tucker IM
中科院分区：
文献类型：
--
作者：
Tucker IM
假设：皂苷是一类植物来源的表面活性物质，广泛用于食品相关的泡沫和乳剂、充气饮料以及药品和化妆品中。作为一种潜在的生物来源和可再生成分，在更广泛的基于表面活性剂的配方中，它们的潜力与它们与合成表面活性剂的混合密切相关。因此，混合皂素-表面活性剂自组装的性质是一个需要研究和了解的重要特征。与传统合成表面活性剂相比，皂苷的非常规结构对混合聚集体的结构造成了一些有趣的限制。实验：用小角中子散射(SANS)研究了皂苷七叶皂苷与一系列不同乙氧基的非离子表面活性剂的结构，从三甘醇单十二烷基醚C12E3到十二烷基乙二醇单十二烷基醚C12E12，发现：散射数据揭示了溶液自组装结构随ESCin/非离子组成和环氧乙烷链长的变化。丰富的结构发展包括从七叶皂甙的细长胶束结构到非离子表面活性剂的胶束结构的演变。在中间溶液组成中，结构以平面为主，主要由平面/胶束混合相组成。平面结构的性质取决于环氧乙烷的链长和溶液的组成，包括片状、双层囊泡、多层囊泡和纳米囊泡结构，与在其他表面活性剂混合物中观察到的结构相同。
Hypothesis: Saponins are a class of plant derived surfactants which are widely used in food related foams and emulsions, aerated drinks, and in pharmaceuticals and cosmetics. As a potential biosourced and renewable ingredient in a wider range of surfactant based formulations their potential is intimately associated with their mixing with synthetic surfactants. As such the nature of the mixed saponin-surfactant self-assembly is an important characteristic to investigate and understand. The unconventional structure of the saponins compared to the conventional synthetic surfactants poses some interesting constraints on the structures of the mixed aggregates.Experiments: Small angle neutron scattering, SANS, is used to investigate the structure of the saponin, escin, mixed with a range of nonionic surfactants with different ethylene oxide groups, from triethylene glycol monododecyl ether, C12E3, to dodecaethylene glycol monododecyl ether, C12E12.Findings: The scattering data reveal a complex evolution in the solution self-assembled structure with varying escin / nonionic composition and ethylene oxide chain length. The rich structural development comprises of the evolution from the elongated micelle structure of escin to the micelle structure of the nonionic surfactant. At the intermediate solution compositions the structure is predominantly planar, comprising mostly of planar / micellar mixed phases. The nature of the planar structures depend upon the ethylene oxide chain length and the solution composition, and include lamellar, bilamellar vesicle, multilamellar vesicle, and nanovesicle structures, in common with what is observed in other surfactant mixtures.