基于聚乳酸的草莓自发气调包装薄膜设计  

Design of AMAP Packaging Film of Strawberry Based on Polylactic Acid

作　　者：云雪艳 李晓芳[1] 董同力嘎 

机构地区：[1]内蒙古农业大学,呼和浩特010018

出　　处：《包装工程》2017年第17期1-7,共7页Packaging Engineering

基　　金：国家自然科学基金(21564012);内蒙古自治区科技创新引导奖励资金(2016)

摘　　要：目的研究材料气体透过性及选择透过性对草莓自发气调包装效果的影响。方法以密闭系统法测定草莓的呼吸速率,结合米氏方程推导呼吸速率与包装膜渗透性的关系式。采用已知渗透性的薄膜结合渗透系统法测定实际贮藏中达到动态平衡时草莓的呼吸速率,根据米氏和动态平衡方程推导适宜草莓自发气调材料的气体选择比。在此基础上,选用对CO_2具有较强选择溶解性的聚乙二醇(PEG)对聚(L-乳酸)(PLLA)进行改性,调整其透气性和CO_2/O_2选择透过性。结果在一定使用面积下,经PEG改性后的PLGL35G20膜包装内的气氛组成可以达到较理想的草莓的AMAP气调浓度。结论PEG起到了良好的调节PLLA薄膜气调包装性能的效果,推测通过调节PEG嵌段和PLLA嵌段的长度及PEG在共聚物薄膜中的含量,可调控薄膜的气体渗透性和选择性,最终使其满足不同果实自发气调包装的最佳要求。The work aims to study the effect of gas permeability and permselectivity of films on the AMAP packaging of strawberry. The respiratory rate of the strawberry was measured in the closed system method. In combination with the Michaelis-Menten equation, the relationship between the respiratory rate and the packaging film permeability was derived. When the dynamic balance was reached in the actual storage, the respiratory rate of the strawberry was measured by combining the film with the known permeability and the permeable system method. The gas selection ratio suitable for the AMAP material of the strawberry was derived according to the Michaelis-Menten and dynamic balance equations. Based on that, the PLLA was modified by the PEG with the strong selective solubility for CO_2, so as to adjust its permeability and CO_2/O_2 permselectivity. The atmosphere composition in the PLGL35G20 film package modified by PEG could reach a fairly ideal AMAP concentration of the strawberry under a certain usable area. PEG has properly adjusted the PLLA film＇s modified atmosphere packaging performance. It is predicted that the gas permeability and selectivity of the film can be adjusted by adjusting the length of PEG and PLLA blocks and the content of PEG in the copolymer film. Finally, the film can meet the best requirements of the AMAP packaging for different fruits.

关 键 词：聚乳酸 聚乙二醇 气体透过性 选择透过性 自发气调包装 

分 类 号：TB485.2[一般工业技术—包装工程]