不同孔径有孔聚乙烯保鲜袋包装蔬菜的保鲜效果

Effects of perforated polythene fresh-keeping bags of different diameters on vegetables

为探讨不同孔径有孔保鲜袋的保鲜效果,以青花菜、菠菜、番茄及黄瓜为材料,进行了无孔和开孔孔径为1、5、9mm的聚乙烯保鲜袋包装实验。结果表明:4种蔬菜的失水率均随开孔孔径的增大而增大,青花菜和菠菜贮藏3d后,1mm孔径处理的色差|a*b*|最小,叶绿素、蛋白质含量最高;番茄和黄瓜贮藏5d后,1mm孔径处理的色差|a*b*|最小,丙二醛含量最低,番茄果实硬度也最高。保鲜袋的开孔孔径对蔬菜的保鲜效果有显著影响,64cm2开1个1mm小孔的保鲜袋适宜青花菜、菠菜、番茄及黄瓜的保鲜。

In order to study the effects of perforated polythene （PE）bags on broccolis, spinaches, tomatoes and cucumbers,holes with different diameters of 1,5,9mm were applied for PE fresh-keeping bags and a PE bag without holes as a control measure.Keeping quality of four kinds of vegetables was investigated.Results showed： rate of water loss of four kinds of vegetables ascended as the diameter of holes on PE bags increased. With broccolis and spinaches after storage for 3d,the treatment with 1mm holes kept color difference ｜a^＊b^＊｜ lowest while Chlorophyll and protein contents highest.With tomatoes and cucumbers after storage for 5d,the treatment with 1 mm holes kept color difference ｜a^＊b^＊｜ and MDA content lowest while fruit firmness of cucumbers highest. The diameter of perforated PE bags had a great impact on the preserving effect.Perforated PE bags that had got a 1mm-hole in 64cm^2 served best for keeping fresh of broccolis,spinaches,tomatoes and cucumbers.