Song Lianjun, Zhi Junli, Zhang Pingan, Zhao Qiuyan, Li Ning, Qiao Mingwu, Liu Jie
College of food science and technology, Henan Agricultural University, Henan, 450002 People's Republic of China.
J Food Sci Technol. 2015 May;52(5):3072-8. doi: 10.1007/s13197-014-1349-z. Epub 2014 Apr 12.
In this study, a new method was developed to produce biodegradable material using soy protein isolate (SPI) as matrix. The blend films were successfully prepared by casting the aqueous dispersions of SPI and polyamic acid salt (PAS) solution. The effects of blending and PAS content on the structure of the resultant films were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC) analyses, scanning electron microscopy (SEM). Furthermore, film thickness, water vapor permeability (WVP), water barrier and mechanical properties were measured. The result showed that there exists strong intermolecular interactions between SPI and PAS, which played an important role in forming a homogeneous structure of the blend films. Moreover, the incorporation of PAS enhanced the water barrier and mechanical properties of the films. This is a simple way to prepare biodegradable films compared with other methods and the blend films have the potentiality to be used as food packaging and biomedical materials instead of synthetic polymer.
在本研究中，开发了一种以大豆分离蛋白（SPI）为基质生产可生物降解材料的新方法。通过浇铸SPI和聚酰胺酸盐（PAS）溶液的水分散体成功制备了共混薄膜。采用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、差示扫描量热法（DSC）分析、扫描电子显微镜（SEM）研究了共混和PAS含量对所得薄膜结构的影响。此外，还测量了薄膜厚度、水蒸气透过率（WVP）、阻水性和机械性能。结果表明，SPI与PAS之间存在强烈的分子间相互作用，这在形成共混薄膜的均匀结构中起重要作用。此外，PAS的加入提高了薄膜的阻水性和机械性能。与其他方法相比，这是一种制备可生物降解薄膜的简单方法，且共混薄膜有潜力替代合成聚合物用作食品包装和生物医学材料。
