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Saponin Adsorption at the Air–Water Interface—Neutron Reflectivity and Surface Tension Study
Langmuir ( IF 3.7 ) Pub Date : 2018-07-20 00:00:00 , DOI: 10.1021/acs.langmuir.8b02158 J. Penfold 1, 2 , R. K. Thomas 1 , I. Tucker 3 , J. T. Petkov 3 , S. D. Stoyanov 4 , N. Denkov 5 , K. Golemanov 4 , S. Tcholakova 5 , J. R. P. Webster 2
Langmuir ( IF 3.7 ) Pub Date : 2018-07-20 00:00:00 , DOI: 10.1021/acs.langmuir.8b02158 J. Penfold 1, 2 , R. K. Thomas 1 , I. Tucker 3 , J. T. Petkov 3 , S. D. Stoyanov 4 , N. Denkov 5 , K. Golemanov 4 , S. Tcholakova 5 , J. R. P. Webster 2
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Saponins are a large group of glycosides present in many plant species. They exhibit high surface activity, which arises from a hydrophobic scaffold of triterpenoid or steroid groups and attached hydrophilic saccharide chains. The diversity of molecular structures, present in various plants, gives rise to a rich variety of physicochemical properties and biological activity and results in a wide range of applications in foods, cosmetics, medicine, and several other industrial sectors. Saponin surface activity is a key property in such applications and here the adsorption of three triterpenoid saponins, escin, tea saponins, and Quillaja saponin, is studied at the air–water interface by neutron reflectivity and surface tension. All these saponins form adsorption layers with very high surface visco-elasticity. The structure of the adsorbed layers has been determined from the neutron reflectivity data and is related to the molecular structure of the saponins. The results indicate that the structure of the saturated adsorption layers is governed by densely packed hydrophilic saccharide groups. The tight molecular packing and the strong hydrogen bonds between the neighboring saccharide groups are the main reasons for the unusual rheological properties of the saponin adsorption layers.
中文翻译：
皂素在空气-水界面的吸附—中子反射率和表面张力研究
皂苷是许多植物物种中存在的一大类糖苷。它们表现出高表面活性，这是由三萜或甾族基团的疏水性支架和附着的亲水性糖链产生的。存在于各种植物中的分子结构的多样性引起了丰富的理化特性和生物活性，并导致了在食品，化妆品，医药和其他几个工业领域中的广泛应用。皂苷的表面活性是此类应用中的关键特性，此处是三种三萜皂苷，七叶皂苷，茶皂苷和奎利亚的吸附性皂素是通过中子反射率和表面张力在空气-水界面处进行研究的。所有这些皂苷形成具有非常高的表面粘弹性的吸附层。吸附层的结构已经由中子反射率数据确定，并且与皂苷的分子结构有关。结果表明，饱和吸附层的结构受致密堆积的亲水糖基团支配。紧密的分子堆积和相邻糖基团之间的强氢键是皂苷吸附层异常流变性质的主要原因。
更新日期：2018-07-20
中文翻译：
皂素在空气-水界面的吸附—中子反射率和表面张力研究
皂苷是许多植物物种中存在的一大类糖苷。它们表现出高表面活性，这是由三萜或甾族基团的疏水性支架和附着的亲水性糖链产生的。存在于各种植物中的分子结构的多样性引起了丰富的理化特性和生物活性，并导致了在食品，化妆品，医药和其他几个工业领域中的广泛应用。皂苷的表面活性是此类应用中的关键特性，此处是三种三萜皂苷，七叶皂苷，茶皂苷和奎利亚的吸附性皂素是通过中子反射率和表面张力在空气-水界面处进行研究的。所有这些皂苷形成具有非常高的表面粘弹性的吸附层。吸附层的结构已经由中子反射率数据确定，并且与皂苷的分子结构有关。结果表明，饱和吸附层的结构受致密堆积的亲水糖基团支配。紧密的分子堆积和相邻糖基团之间的强氢键是皂苷吸附层异常流变性质的主要原因。
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