壳聚糖/牛蒡提取物复合膜的制备及应用

为开发新型复合涂膜保鲜剂,以壳聚糖、牛蒡提取物为原料,明胶、甘油为添加剂制备复合膜,并测试其力学性能、抑菌性能、抗氧化性能,同时将复合膜应用于圣女果保鲜中.结果表明:共混液中壳聚糖质量浓度为0.02 g/mL、牛蒡提取物质量浓度为0.1 g/mL、明胶质量浓度为0.03 g/mL、甘油体积分数为0.5 %时制得的复合膜综合性能最佳,抗拉强度为(26.97±2.26)MPa、断裂伸长率为(104.3±5.4)%、羟基自由基清除率为(94.67±4.3)%、抑菌率为(99.32±3.28)%,表面和断裂面比较平整,未出现分相.该复合膜处理的圣女果硬度、可溶性固形物质量分数、VC质量分数、丙二醛(MDA) 质量摩尔浓度均优于壳聚糖单膜处理和未处理的圣女果,且差异显著(P＜0.05).

Preparation and application of chitosan/ burdock extract composite membrane

To develop new preservative,composite membrane has been prepared with chitosan,burdock extract,gelatin and glycerol.Mechanical properties,antibacterial properties,oxidation resistance of the composite membrane have been tested.The composite membrane has been used in preservation of cherry tomato at the same time.The results show that the comprehensive properties of composite membrane is best with a (26.97±2.26)MPa tensile strength,(104.3±5.4)% elongation at break,(94.67±4.3)% maximum scavenging rate of hydroxyl radical,(99.32±3.28)% inhibitory rate when the concentration of chitosan in mixed liquid is 0.02 g/mL; the concentration of burdock extract is 0.1 g/mL;the mass concentration of gelatin is 0.03 g/mL;the volume fraction of glycerol is 0.5 %.The surface and fracture surface is flat without phase separation.The hardness,soluble solids mass fraction,VC mass fraction,malondialdehyde molalities of cherry tomato which have been processed by composite membrane will be better than these of untreated and processed by chitosan monofilm and the difference is significant(P＜0.05).