为探讨不同薄膜包装对鲜莲蓬采后褐变的影响,文中以鲜莲蓬为实验材料,研究了2种不同规格薄膜包装(12.75μm打孔聚乙烯袋-CK,15.55μm聚乙烯袋-P1,32.70μm聚乙烯袋-P2)对鲜莲蓬低温[(5±1)℃]贮藏过程中褐变及相关酶活性的影响。研究结果表明:不同薄膜包装处理均可降低鲜莲蓬的褐变指数和多酚氧化酶(PPO)活性,但对过氧化物酶(POD)活性影响不大;P2处理可显著延缓采后鲜莲蓬丙二醛含量的增加,并维持其较高的总酚含量,显著降低PPO活性,提高苯丙氨酸解氨酶(PAL)的活性。总体看来,P2处理的整体效果显著的优于P1处理。

To investigate the influence of different films packaging on postharvest browning of fresh lotus,we studied the browning and related enzyme activity of fresh lotus with two kinds of film packages in low temperature(5 ±1℃) storage.The concentrations of CO2 and O2,browning indexes,the content of malondialdehyde(MDA) and total phenol,the activities of polyphenol oxidase(PPO),peroxidase(POD) and phenylalnine ammonialyase(PAL) were measured.The results showed that all packages could decrease browning indexes and PPO activities.However,the POD activity was not significantly affected by film packaging.P2 can significantly inhibited the increase of MDA content in fresh lotus,and maintain the higher total phenol content.In addition,P2 also can significantly decrease the PPO activity and increase the activity of PAL.In conclusion,P2 had the best effect on inhibiting the browning of fresh lotus.