复合大豆分离蛋白膜力学性能研究
详细信息Study on the mechanical properties of composite film of soybean isolated protein
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摘要: 在大豆分离蛋白膜制备工艺基础上,添加原纤维素、羧甲基纤维素和羟丙基甲基纤维素三种材料,制备出改性纤维素大豆分离蛋白复合膜。考察不同添加量的三种添加材料对复合膜的膜厚度(FT)、膜完整性(FI)、抗拉强度(TS)、断裂伸长率(E)、透光率(T)、溶解率(D)、水蒸汽透过系数(WVP)七个性能指标的影响效果,并分析了大豆分离蛋白膜和分别添加三种材料所制得的复合膜的扫描电子显微电镜图,筛选出最佳添加材料,最后对其最佳添加量进行了研究。结果表明:当羟丙基甲基纤维素与大豆分离蛋白的质量百分比为4%时,复合膜的抗拉强度达到最大值4.43MPa,水蒸汽透过系数达到最小值21.0g·mm/(m2·h·kPa),断裂伸长率与透过率均较为理想。Abstract: On the basis of the preparation process of soybean isolated protein film, composite film of modified cellulose and soybean isolated protein was prepared by adding original cellulose, carboxy methylated cellulose (CMC) and hydroxy propyl methyl cellulose (HPMC) . The effects of the seven performance indicators on composite film by different dosages of three added materials, which were film thickness (FT) , film integrity (FI) , tensile strength (TS) , E (Elongation at Break) , T (Transmittance) , D (Dissolution Ratio) and WVP (Water Vapor Permeability) , were inspected. The scanning electron microscopy (SEM) graph of the soybean isolated protein (SPI) film and the composite film adding respectively the three kinds of material were analyzed. The best adding material was chosen and the optimum adding amount was studied. The results showed that:when the mass percentage of the HPMC and soybean isolated protein was 4%, the tensile strength of composite film reached the maximum of 4.43MPa, and the water vapor permeability reached the minimum of 21.0g·mm/ (m2·h·kPa) , and the elongation at break and transmittance rate were relatively ideal.
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