目的 研究4种薄膜包装对菜心贮藏期间品质的影响，为延长菜心货架期提供依据。方法 以菜心为实验材料，分别采用低密度聚乙烯（low-densitypolyethylene，LDPE）、聚偏二氯乙烯（polyvinylidenechloride，PVDC）、聚氯乙烯（polyvinylchloride，PVC）及聚乙烯（polyethylene，PE）等4 种薄膜包装在4 ℃下贮藏，贮藏期间每隔3 d测定菜心的呼吸强度、丙二醛含量、过氧化物酶活性等生理生化指标。结果 在贮藏0~6 d，LDPE，PVDC和PVC对菜心呼吸强度的抑制效果优于PE；LDPE，PVC和PE组菜心的硬度略有提高，并接近鲜样的硬度；4种薄膜均能有效抑制菜心叶绿素的降解和苯丙氨酸解氨酶活性，且增强了过氧化物酶活性。结论 菜心在采后贮运期间，使用4种薄膜包装均有利于延缓其衰老进程，提高了其品质，其中LDPE的保鲜效果最好，其次为PVC；当菜心货架期≤6 d时，其综合品质最佳。

The paper aims to study the effects of 4 packaging films on the storage quality of flowering cabbage to provide basis for prolonging the shelf life of flowering cabbage.The flowering cabbage was respectively packed with LDPE, PVDC, PVC and PE, and stored at 4 ℃. The physiological and biochemical indexes such as respiratory intensity, MDA content and peroxidase activity of flowering cabbage were measured every 3 days during storage. During storage of 0~6 days, the inhibitory effect of LDPE, PVDC and PVC on respiration intensity of flowering cabbage was superior to PE. The hardness of flowering cabbage of LDPE, PVC and PE groups was slightly high and close to that of the fresh. The results showed that four packaging film scould effectively inhibit chlorophyll degradation and phenylalanine ammonia-lyase activity, and enhance peroxidase activity. During postharvest storage of flowering cabbage, the four packaging films could delay the aging process of flowering cabbage and improve its quality. LDPE was the most suitable packaging film for flowering cabbage, followed by PVC. When the shelf life of flowering cabbage was≤6 days, the comprehensive quality of flowering cabbage was the best.