不同配比大豆球蛋白降解材料结构与力学性能

Structure and Mechanical Properties of Soybean Globulin Biodegradable Materials in Different Ratio

研究了大豆分离蛋白的主要组分7S和11S球蛋白对其材料力学性能的影响,并采用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳仪(SDS-PAGE)和电子扫描显微镜(SEM)分析表征了大豆蛋白可生物降解材料的组成和微观结构。结果表明:随着球蛋白11S/7S的增大,大豆蛋白材料的拉伸强度先升高后降低,其断裂伸长率先降低后升高,比值为1时,材料的拉伸强度达到最高。综合材料的性能测试与结构表征,大豆蛋白在形成材料时,7S和11S球蛋白之间存在着交联相互作用。

The effect of different ratios of 11S globulin and 7S globulin on mechanical properties of biodegradable soybean protein materials was determined.The compositions and microstructures of the materials were characterized using sodium dodecyl sulfate-polyacrylamide gel eletrophoresis（SDS-PAGE）and scanning electron microscopy（SEM）respectively.The results showed that the tensile strength of the material was increased at first and then decreased,and elongation showed the opposite tendency with increasing 11S/7S ratio.When the ratio of 11S globulin and 7S globulin was 1.0,the material had the maximum tensile strength.The microstructure of the material is a reflection of the mechanical properties,the denser and more uniform the microstructure be,the higher mechanical properties of materials be.Based on comprehensive investigation on property testing and structure characterization of materials,when the soybean protein materials were formed,the cross-linking reactions happened between 7S globulin and 11S globulin.