Tunable assembly of hydrophobic protein nanoparticle at fluid interfaces with tannic acid
Tunable assembly of hydrophobic protein nanoparticle at fluid interfaces with tannic acid
复制标题
疏水性蛋白质纳米颗粒在与单宁酸的流体界面处的可调组装
DOI：
10.1016/j.foodhyd.2016.09.010
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发表时间：
2017-02
影响因子：
10.7
通讯作者：
Yang Xiaoquan
中科院分区：
文献类型：
--
作者：
Zou Yuan;Wan Zhili;Guo Jian;Wang Jinmei;Yin Shouwei;Yang Xiaoquan
控制吸附在流体界面上的颗粒聚集的粒间力决定了颗粒界面的流变性和微观结构。本研究利用天然小分子单宁酸(TA)来修饰食品级疏水蛋白质颗粒(玉米醇溶蛋白纳米颗粒)在空气-水界面的颗粒-颗粒相互作用和组装行为。对于裸露的玉米醇溶蛋白颗粒(ZP)，快速的吸附和较高的粒间力导致ZP在界面上的覆盖率较低，并形成大的ZP聚集体。TA的氢键减弱了颗粒的疏水性，从而削弱了流体界面上的颗粒间作用力。因此，ZTP在界面上的吸附过程和组装速率明显降低，这也为ZTP重排成有序的界面网络提供了足够的时间。此外，表面压力-变形的李萨如曲线被用来从界面微观结构的角度来理解表面对大的机械变形的流变响应。ZTP稳定界面的流变响应表现为拉伸时的应变硬化和压缩时的应变软化。这些结果表明，可以通过改变TA含量来调节玉米醇溶蛋白颗粒界面的流变性和微观结构。
Interparticle forces that govern the assembly of particles adsorbed at fluid interfaces determine the rheology and microstructure of particle laden interface. In this study, natural small molecule, tannic acid (TA), was used to modify particle-particle interactions and assembly behaviors of food grade hydrophobic protein particle (zein nanoparticle) at air-water interface. For bare zein particle (ZP), the rapid adsorption and high interparticle forces led to the low coverage and formation of large ZP aggregates at the interface. The hydrogen-bonding of TA weakened the particle hydrophobicity and thus interparticle forces at fluid interfaces. Therefore, the adsorption process and assembly rate of ZTP at the interface obviously reduced, which also provided enough time for ZTP to rearrange into orderly interfacial networks. Furthermore, the Lissajous plots of surface pressure versus deformation are used to understand the surface rheological response to large mechanical deformation in terms of interfacial microstructure. The rheological response of interface stabilized by ZTP showed strain hardening during extension and strain softening during compression. These findings indicate that the interfacial rheology and microstructure of zein particle-laden interface can be tuned by changing the TA content.
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