Characteristics of polyglycerol ester and its different fractions.
Characteristics of polyglycerol ester and its different fractions.
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聚甘油酯及其不同馏分的特性。
DOI：
10.1016/j.jcis.2012.10.063
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发表时间：
2013
影响因子：
9.9
通讯作者：
H. Limbach
中科院分区：
文献类型：
--
作者：
C. Curschellas;K. Nagy;E. Windhab;H. Limbach
从食用油中获得的聚甘油酯是食品工业中常用的表面活性剂。尽管它们应用广泛，但这些表面活性剂的组成和性质仍然没有得到很好的表征。这项研究揭示了聚甘油酯中存在迄今为止未知的四触角、五触角成分，它们表现出非常强的钠亲和力。研究了这些新见解对表面活性剂活性的影响。液-液萃取用于分级分离聚甘油酯成分，以便将物理化学行为与级分的极性联系起来。与完整混合物相比，极性最大的部分表现出更快的吸附动力学和更高的弹性模量，而与复杂混合物相比，极性最小的部分表现出更慢的吸附动力学和更低的弹性模量。 Na+的添加被证明可以加速本体溶液中表面活性剂自组装的团聚，并且还可以增加空气-水界面的弹性模量。这些观察结果表明，天然聚甘油酯的组成比迄今为止假设的更加多样化，并且这些混合物的总体行为不仅取决于单触角形式和五触角形式之间的两亲相互作用，而且还取决于成分的内源盐含量。
Polyglycerol esters obtained from edible oils are commonly used surfactants in the food industry. Despite their widespread application, the composition and properties of these surfactants are still not well characterized. This study reveals the presence of so far unknown tetra-, penta-antennary constituents in polyglycerol esters, which exhibit very strong sodium affinity. The implications of these new insights on surfactant activity were investigated. Liquid–liquid extraction was used to fractionate a polyglycerol ester ingredient in order to link physicochemical behavior to the polarity of the fractions. The most polar fraction showed faster adsorption kinetics and higher elastic moduli than the full mixture, whereas the least polar fraction showed slower adsorption kinetics and lower elastic moduli as compared to the complex mixture. The addition of Na+was shown to accelerate the agglomeration of surfactant self-assemblies in bulk solutions and also to increase the elastic modulus at the air–water interface. These observations suggest that the composition of natural polyglycerol esters is more diverse than so far assumed and the overall behavior of these mixtures is determined not only by the amphyphilic interactions between mono- and penta-antennary forms, but also by the endogenous salt content of the ingredient.