增塑剂对玉米醇溶蛋白膜阻隔性能影响

摘要

Zein has good film forming property,but the film is brittle,there need add different plasticizers to improve the properties,but the addition of plasticizers will affect the barrier properties. This topic researches the moisture resistance and oil–resisting of zein film plasticized with glycerin, polyethylene glycol(PEG)400,monoglyceride and prepared in different ethanol aqueous solution. The results show that the water vapor permeability is minimum and through oil rate is largest when ethanol concentration is 80%,glycerin concentration is 0.3 g/g zein,PEG–400 concentration is 0.2 g/gzein, monoglyceride concentration is 0.3 g/gzein.%　　玉米醇溶蛋白具有较好成膜性,但其形成膜较脆,需通过添加不同增塑剂加以改善；但添加增塑剂会使膜阻隔性能受到影响.该实验以甘油、聚乙二醇(PEG)400、单甘油酯为增塑剂,研究在不同乙醇浓度时制备玉米醇溶蛋白(zein)膜阻湿性及阻油性；结果表明,当乙醇浓度为80%、甘油添加量为0.3 g/g zein,PEG–400添加量为0.2 g/g zein,单甘油酯添加量为0.3 g/g zein时,膜的水蒸汽透过率最小,透油率最大.