常温下功能集成包装袋在甜玉米保鲜中的应用

Application of Functional Integrated Packaging Bag in Preservation of Sweet Corn at Normal Temperature

目的常温条件下延长新鲜甜玉米的保鲜时间,为常温运输提供条件。方法使用面积比例不同的高透氧薄膜和高透水薄膜制作保鲜包装袋,用其对甜玉米进行包装贮藏,以裸放甜玉米为对照,在温度为(25±1)℃,相对湿度为(60±5)%的条件下进行保鲜实验。每天对包装袋内的氧气和二氧化碳含量变化、甜玉米质量损失率、玉米籽粒硬度、可溶固形物含量、总酸含量、Vc含量以及感官品质进行测定和分析。结果裸放组样品失重迅速,其可溶固形物含量明显降低,实验进行到第2天时甜玉米就已经失去了商品价值。在实验组中,由于2种薄膜自身的透气性能不同,使得包装袋内氧气含量迅速降低、二氧化碳迅速升高。这样的贮藏环境有效抑制了甜玉米的呼吸等生理活动,使玉米的营养物质、感官评价等指标保持在较好的水平。结论功能包装袋可以将甜玉米的货架期延长到4~5 d。

The work aims to prolong the preservation time of fresh sweet corn at normal temperature,so as to provide conditions for normal temperature transportation.Made of high oxygen-permeable film and high permeable film with different area ratios,the fresh-keeping packaging bags were used for packaging and storage of sweet corn.The preservation experiment was carried out under the condition of t=(26±1)℃and RH=(60±5)%,with naked sweet corn as the control group.The change in the concentration of oxygen and carbon dioxide in the packaging bag,the weight loss rate of sweet corn,the hardness of corn grain,the contents of soluble solids,total acid and VC and the sensory quality were measured and analyzed every day.In the naked group,the weight loss of sample was rapid and the content of soluble solids decreased significantly.By the second day of the experiment,the sweet corn had lost its commercial value.In the experimental group,due to different air permeability of the two films,the oxygen content in the packaging bag decreased rapidly and the carbon dioxide increased rapidly.This kind of storage environment effectively inhibited the physiological activities of sweet corn,such as respiration.The indexes such as nutrients and sensory evaluation of sweet corn were kept at a better level.The shelf life of sweet corn with functional packaging bags can be extended to 4-5 days.