不同薄膜包装对冷藏空心菜采后品质的影响

Influence of film packaging on postharvest quality of Ipomoea aquatica during storage

为探讨不同薄膜包装对空心菜采后品质的影响，文中以‘竹叶’空心菜为试验材料，在（5±1）℃贮藏条件下（90％-95％RH），研究了3种不同厚度薄膜（CK，32．70um带孔聚乙烯袋；P1，32．70um聚乙烯袋；P2，12．75um聚乙烯袋）包装对空心菜（茎、叶）贮藏品质的影响。结果表明：与对照相比，薄膜包装可有效提高空心菜品质，延缓其黄化进程，维持空心菜较高的生理活性，其中P1组的效果最为理想。相比P2及对照，P1组可显著延缓空心莱叶绿素分解，促进可滴定酸积累，维持其较高的总酚含量及抗氧化活性。P1可有效维持采后空心菜的品质，这与其包装袋微环境中的高CO2浓度（1．6％-2．1％）和低O2浓度（14．8％～17．5％）有关。

To investigate the influences of film packaging with different thickness on the quality of postharvest Ipomoea aquatic. Ipomoea aquatica were treated with three kind of film packages ： CK- 32.7 um polyethylene bag with four holes, P1- 32.7 um polyethylene bag and P2-12.75 um polyethylene bag at （5 ±1 ） ℃ with RH 90% -95%. The results showed that film packages could decrease Ipomoea aquatica decay indexes. Pl-treatment was more effective. In addition, Pl-treated could significantly increase titratable acid, maintain high phenols content and antioxidant activity. Through the analysis of gas ratio of packages, we found that compared with other treatments, Pl-treatment could maintain higher concentration CO2 （ 1.6% - 2.1% ） and low concentration O2 （ 14.8% - 17.5% ）, which was essential to keep the good qualities.