茶多糖对海藻酸钠-淀粉-茶末复合膜性能的影响

Effects of tea polysaccharide on the properties of sodium alginate/starch/tea powder composite membrane

目的:开发绿色环保海藻酸钠-淀粉-茶末复合膜。方法:向海藻酸钠-淀粉-茶末复合膜中添加不同质量分数的茶多糖,探究其对复合膜全红外阻隔率、色差、水溶性、水蒸气透过系数、力学性能、厚度、含水率、自由基清除率、抑菌性等性能的影响。结果:茶多糖和海藻酸钠有很强的相互作用。当茶多糖质量分数为5.00%时,复合膜拉伸强度最大,为9.71 MPa;断裂伸长率最大,为25.42%,水蒸气透过系数最小,为2.38×10^(-9)g·mm/(cm^(2)·d·Pa),此时其抑菌性能最好。复合膜的抗氧化性随茶多糖添加量的增加而增加,最高可达85.49%。结论:茶多糖对复合膜理化性质及抑菌抗氧化性能均有一定影响。当茶多糖质量分数为5.00%时,复合膜具有最佳的力学性能、阻湿性能及抑菌性能。

Objective:This study aimed to develop a green and environment-friendly sodium alginate/starch/tea powder composite membrane.Methods:Tea polysaccharides with different mass fractions were added to the sodium alginate/starch/tea powder composite film to investigate the influence of tea polysaccharides on the properties of sodium alginate/starch/tea powder composite film.Therefore,full infrared barrier,color difference,water solubility,water vapor permeability,tensile strength,elongation at break,thickness,water content,free radical clearance and bacteriostasis were measured.Results:A strong interaction between tea polysaccharides and sodium alginate were found.The composite film with tea polysaccharide content of 5%exhibited the best comprehensive performance.The best bacteriostatic performance was observed when the tensile strength,elongation at break,water vapor permeability were 9.71 MPa,25.42%,and 2.38×10^(-9)g·mm/(cm^(2)·d·Pa),respectively.The antioxidant activity of the composite membrane increased with the increase of the amount of tea polysaccharide added,with a maximum of 85.49%.Conclusion:Tea polysaccharides can improve physicochemical properties,antibacterial and antioxidant properties of the composite membrane.When the mass fraction of tea polysaccharides was 5.00%,the composite membrane had the best mechanical,moisture,and antibacterial properties.