高直链玉米淀粉-壳聚糖复合膜透气透水性能研究

Gas Transmission and Water Vapor Transmission Properties of High-Amylose Corn Starch/Chitosan Edible Film

本文以高直链玉米淀粉（HACS）和壳聚糖（CS）为基本材料,甘油为增塑剂,甲基纤维素（MC）为增强剂制备可食性复合膜,研究了高直链玉米淀粉与壳聚糖的配比、甘油的添加量以及甲基纤维素的添加量对复合膜的透气透水性能的影响。结果表明,HACS：CS为2：1时,膜的CO2透过量和O2透过量最低,水蒸气透过量（WVT）也处于较低水平。随着HACS：CS的降低,膜的CO2透过量和O2透过量增加到最大值再降低,而WVT值呈增大趋势。甘油量的增加使复合膜的CO2透过量和O2透过量先增加后降低,而WVT变化趋势与透气量一致。MC的添加量为2%时,HACS/CS复合膜的透气量最低,而在MC添加量4%~6%时,膜的WVT最低。

In this experiment,edible films from high-amylose corn starch（HACS） and chitosan（CS） were developed by casting film-solution on leveled trays.The effects of ratio of starch to chitosan,glycerol dosage and methylcellulose（MC） dosage on CO2 and O2 transmission,water vapor transmission（WVT） of edible films were investigated.The result showed that the edible composite films had the lowest CO2 and O2 transmission and lower WVT when the ratio of chitosan and content of glycerol reach 2：1.The value of CO2 and O2 transmission increase to the highest and then decrease,and WVT increased while the ratio of chitosan and content of glycerol continued decrease.The increase of content of glycerol improved the CO2,O2 transmission and WVT of edible films first,and then decreased gradually.The addition of 2% methylcellulose decreased the gas permeability properties of the edible film to the lowest.When the content of methylcellulose was between 4% and 6%,WVT of the edible film reached the lowest.