抗坏血酸结合自发气调包装对灵武长枣贮藏品质和抗氧化性的影响

目的：探明外源抗坏血酸（ascorbic acid，AsA）处理与自发气调包装（modified atmosphere package，MAP）对灵武长枣贮藏品质的协同保鲜效果。方法：将灵武长枣经0.3 g/100 mL AsA溶液浸泡后分别用聚乙烯和0.03 mm厚的低密度聚乙烯（low-density polyethylene，LDPE）两种MAP进行包装，分析冷藏过程中的果实理化品质与抗氧化能力的变化情况。结果：AsA与MAP的复合保鲜效果均在不同程度上优于单独使用MAP或AsA；其中LDPE活性气调包装结合AsA处理能显著减缓灵武长枣果实硬度和可滴定酸含量的降低（P＜0.05），抑制果实呼吸速率和相对电导率的上升，维持果实AsA、总酚和类黄酮含量，提高抗氧化能力。结论：AsA结合MAP可以有效提高灵武长枣贮藏品质，延长贮藏期，其中采用AsA结合LDPE活性气调包装的保鲜效果最好。

Effect of Ascorbic Acid Combined with Modified Atmosphere Packaging on Storage Quality and Antioxidant Activity of Lingwuchangzao Jujube Fruit

Objective:To explore the synergetic effect of exogenous ascorbic acid(AsA)combined with modified atmosphere packaging(MAP)on the storage quality of Lingwuchangzao jujube fruit.Methods:Postharvest jujube fruit were soaked in 0.3 g/100 mL AsA solution and then packaged in polyethylene bags or 0.03 mm thick low-density polyethylene(LDPE)bags with modified atmosphere in them.Changes in the physicochemical characteristics and antioxidant capacity of the fruit were investigated during subsequent cold storage.Results:The preservation effect of AsA combined with MAP was better than that of either alone.MAP in LDPE bags combined with AsA significantly delayed the decrease in fruit firmness and the content of titratable acid(P<0.05),suppressed the increase in respiration rate and relative conductivity,maintained the contents of AsA,flavonoids and polyphenols,and improve antioxidant capacity.Conclusion:The combination of MAP and AsA can effectively improve the storage quality and prolong the storage period of Lingwuchangzao jujubes,and the best preservation effect can be achieved using 0.3 g/100 mL AsA combined with MAP in 0.03 mm thick LDPE bags.