Self-Assembly of Oleyl Bis(2-hydroxyethyl)methyl Ammonium Bromide with Sodium Dodecyl Sulfate and Their Interactions with Zein,Langmuir

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Self-Assembly of Oleyl Bis(2-hydroxyethyl)methyl Ammonium Bromide with Sodium Dodecyl Sulfate and Their Interactions with Zein
Langmuir ( IF 3.7 ) Pub Date : 2016-08-04 00:00:00 , DOI: 10.1021/acs.langmuir.6b02091
Yao Chen _{1,

2} , Xiuling Ji ₁ , Yuchun Han ₁ , Yilin Wang _{1,

2}

Affiliation

Surface tension and aggregation behavior in an aqueous solution of the mixture of cationic surfactant oleyl bis(2-hydroxyethyl)methylammonium bromide (OHAB) and anionic surfactant sodium dodecyl sulfate (SDS) have been studied by surface tension, conductivity, turbidity, zeta potential, isothermal titration microcalorimetry (ITC), cryogenic transmission electron microscopy (Cryo-TEM), and dynamic light scattering. The mixture shows pretty low critical micellar concentration and surface tension, and successively forms globular micelles, unilamellar vesicles, multilamellar vesicles, rod-like micelles, and globular micelles again by increasing the molar fraction of OHAB from 0 to 1.00. The cooperation of hydrophobic interaction between the alkyl chains, electrostatic attraction between the headgroups as well as hydrogen bonds between the hydroxyethyl groups leads to the abundant aggregation behaviors. Furthermore, the solubilization of zein by the OHAB/SDS aggregates and their interactions were studied by ITC, total organic carbon analysis (TOC), and Cryo-TEM. Compared with pure OHAB or pure SDS solution, the amount of zein solubilized by the OHAB/SDS mixture is significantly reduced. It means that the mixtures have much stronger abilities in solubilizing zein. This result has also been proved by the observed enthalpy changes for the interaction of OHAB/SDS mixture with zein. Mixing oppositely charged OHAB and SDS reduces the net charge of mixed aggregates, and thus, the electrostatic attraction between the aggregates and zein is weakened. Meanwhile, the large size of the aggregates may increase the steric repulsion to the zein backbone. This work reveals that surfactant mixtures with larger aggregates and smaller CMCs solubilize less zein, suggesting how to construct a highly efficient and nonirritant surfactant system for practical use.

中文翻译：

Oleyl双（2-羟乙基）甲基溴化铵与十二烷基硫酸钠的自组装及其与玉米醇溶蛋白的相互作用

通过表面张力，电导率，浊度，ζ电势，阳离子表面活性剂油基双（2-羟乙基）甲基溴化铵（OHAB）和阴离子表面活性剂十二烷基硫酸钠（SDS）的混合物在水溶液中的表面张力和聚集行为进行了研究等温滴定微量热法（ITC），低温透射电子显微镜（Cryo-TEM）和动态光散射。该混合物显示出非常低的临界胶束浓度和表面张力，并通过将OHAB的摩尔分数从0增加到1.00依次形成球状胶束，单层囊泡，多层囊泡，棒状胶束和球状胶束。烷基链之间疏水相互作用的配合，头基之间的静电吸引以及羟乙基之间的氢键导致丰富的聚集行为。此外，通过ITC，总有机碳分析（TOC）和低温TEM研究了OHAB / SDS聚集体对玉米蛋白的增溶作用及其相互作用。与纯OHAB或纯SDS溶液相比，被OHAB / SDS混合物溶解的玉米醇溶蛋白的量显着减少。这意味着该混合物具有更强的玉米醇溶蛋白溶解能力。观察到的OHAB / SDS混合物与玉米醇溶蛋白相互作用的焓变也证明了这一结果。混合带相反电荷的OHAB和SDS会降低混合骨料的净电荷，因此，骨料和玉米蛋白之间的静电吸引力会减弱。同时，聚集体的大尺寸可能会增加对玉米醇溶蛋白骨架的空间排斥。这项工作表明，具有较大聚集体和较小CMC的表面活性剂混合物可溶解较少的玉米醇溶蛋白，提示如何构建实用的高效无刺激性表面活性剂体系。

更新日期：2016-08-04

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