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Preparation and Characterization of Chitosan/Soy Protein Isolate Nanocomposite Film Reinforced by Cu Nanoclusters

机译：铜纳米簇增强壳聚糖/大豆分离蛋白纳米复合膜的制备与表征

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摘要

Soy protein isolate (SPI) based films have received considerable attention for use in packaging materials. However, SPI-based films exhibit relatively poor mechanical properties and water resistance ability. To tackle these challenges, chitosan (CS) and endogenous Cu nanoclusters (NCs) capped with protein were proposed and designed to modify SPI-based films. Attenuated total reflectance-Fourier transform infrared spectroscopy and X-ray diffraction patterns of composite films demonstrated that interactions, such as hydrogen bonds in the film forming process, promoted the cross-linking of composite films. The surface microstructure of CS/SPI films modified with Cu NCs was more uniform and transmission electron microscopy (TEM) showed that uniform and discrete clusters were formed. Compared with untreated SPI films, the tensile strength and elongation at break of composite films were simultaneously improved by 118.78% and 74.93%, respectively. Moreover, these composite films also exhibited higher water contact angle and degradation temperature than that of pure SPI film. The water vapor permeation of the modified film also decreased. These improved properties of functional bio-polymers show great potential as food packaging materials.
机译：基于大豆分离蛋白（SPI）的薄膜在包装材料中的使用受到了广泛的关注。然而，基于SPI的膜表现出相对较差的机械性能和耐水性。为了应对这些挑战，提出了壳聚糖（CS）和内源性铜纳米簇（NCs）并加有蛋白质，并设计用于修饰基于SPI的薄膜。衰减的全反射傅里叶变换红外光谱和复合膜的X射线衍射图表明，成膜过程中的相互作用（例如氢键）促进了复合膜的交联。 Cu NCs修饰的CS / SPI薄膜的表面微观结构更均匀，透射电子显微镜（TEM）显示形成均匀且离散的簇。与未处理的SPI薄膜相比，复合薄膜的拉伸强度和断裂伸长率分别分别提高了118.78％和74.93％。而且，这些复合膜还显示出比纯SPI膜更高的水接触角和降解温度。改性膜的水蒸气渗透性也降低。功能性生物聚合物的这些改善的性能显示出作为食品包装材料的巨大潜力。

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