Department of Food Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Beheshti Avenue, Gorgan 49138-15739, Iran.
Carbohydr Polym. 2013 Sep 12;97(2):817-24. doi: 10.1016/j.carbpol.2013.05.037. Epub 2013 May 24.
Biodegradable edible films based on soluble soybean polysaccharide (SSPS), a new film-forming material, and three levels of glycerol (20%, 30% and 40%, w/w) as plasticizer, were developed and evaluated in terms of physical, mechanical, barrier and optical properties as well as their microstructure. SSPS-based films with a concentration of 20% glycerol possessed the lowest water vapor permeability. Increasing the glycerol content increased (P<0.05) values for elongation at break, but decreased (P<0.05) tensile-strength values. It was found that plasticizer concentration significantly affected the films' glass-transition temperature; however, it had no significant effect on their melting point. Color measurement showed that increasing the glycerol concentration caused the b and L values to increase, while ΔE value decreased. These results were explained by the film's microstructure, which was analyzed by atomic force microscopy and scanning electron microscopy. The results indicated that SSPS could be a promising food-packaging material.
基于可生物降解的食用型大豆多糖（SSPS）的薄膜，作为一种新型成膜材料，以及三个不同浓度水平的甘油（20%、30%和 40%，w/w）作为增塑剂，对其物理、机械、阻隔和光学性能及其微观结构进行了评估。浓度为 20%甘油的 SSPS 基薄膜具有最低的水蒸气透过率。增塑剂含量的增加（P<0.05）会提高断裂伸长率的值，但会降低（P<0.05）拉伸强度值。研究发现，增塑剂浓度显著影响了薄膜的玻璃化转变温度；然而，对其熔点没有显著影响。颜色测量表明，增塑剂浓度的增加会导致 b 和 L 值的增加，而 ΔE 值降低。这些结果可以通过原子力显微镜和扫描电子显微镜对薄膜的微观结构进行分析来解释。结果表明，SSPS 可以作为一种有前途的食品包装材料。
