响应面法优化纳米SiO_2改性大豆蛋白/聚乙烯醇复合薄膜工艺  

Response Surface Methodology Optimization of Soy Protein Composite Films Modified by Nanoparticles

作　　者：尹国平[1] 陈志周[1] 甄红伟[2] 

机构地区：[1]河北农业大学食品科技学院,河北保定071000 [2]河北农业大学教学实验林场,河北保定071000

出　　处：《中国食品学报》2014年第3期128-134,共7页Journal of Chinese Institute Of Food Science and Technology

基　　金：河北省科技计划基金项目(10225151)

摘　　要：为增强大豆蛋白/聚乙烯醇复合薄膜的综合性能,以纳米SiO2含量、分散剂聚乙烯基吡咯烷酮(PVPK-30)的含量、膜液pH值为影响因子,以薄膜拉伸强度、断裂伸长率、透光率、吸水率为主要评价指标,通过响应曲面试验确定纳米SiO2改性大豆蛋白/聚乙烯醇复合膜的最佳工艺条件。试验结果表明:当加入1.75%的SiO2纳米粒子(占大豆蛋白和PVA干重),1.20%的PVP(占纳米粒子干重),膜液的pH值控制在5.50时,复合薄膜的综合性能最好;与原大豆蛋白/PVA复合膜相比,改性后薄膜的抗张强度由4.61 MPa增加到9.76 MPa,断裂伸长率由64.98%提升到92.76%,透光率由15.54%升到24.12%,而吸水率由46.37%略降到45.28%。本试验为大豆蛋白/聚乙烯醇复合薄膜性能的改善以及生产应用提供理论和试验基础。To modified the comprehensive properties of soy protein/polyvinyl alcohol films,a response surface analysis was used to further optimize the soy protein/PVA composite films modified by nano-SiO2condition.The SiO2nanoparticles concentration,the dispersant（PVPK-30） concentration and pH value of coating liquid were viewed as influence factors.Furthermore,the tensile strength,elongation,transmittance and water absorption of the films were compared.The results showed that the optimum film-forming conditions were 1.75 % SiO2nanoparticles（based on the dry weight of soy protein and PVA）,1.20% PVP（based on weight of SiO2nanoparticles） and pH 5.50.Compared with the original soy protein/PVA composite film,the tensile strength,breaking elongation and transmittance were increased from 4.61 MPa to 9.76 MPa,64.98% to 92.76% and 15.54% compared to 24.12%,respectively.After modification,however,did not show great significant decrease in the water absorption of the specimens,from 46.37% to 45.28%.The research contributes to the modification and application of common soy protein/ polyvinyl alcohol films.

关 键 词：纳米SIO2 大豆蛋白 聚乙烯醇 响应面分析法 工艺条件 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]