Department of Food Technology, EPSO, University Miguel Hernández, Orihuela, Spain.
Department of Applied Biology, EPSO, University Miguel Hernández, Orihuela, Spain.
J Sci Food Agric. 2019 Jan 15;99(1):235-243. doi: 10.1002/jsfa.9165. Epub 2018 Jul 20.
Plums are much appreciated by consumers as fresh fruit but have a limited storage life. Since reactive oxygen species (ROS) are associated with fruit ripening, an increase in ROS scavenging antioxidant systems could lead to a delay in postharvest plum ripening and in maintaining fruit quality after long cold storage.
Results showed that crop yield (kg per tree) and fruit weight were enhanced by preharvest oxalic acid (OA) treatment of plum cultivars ('Black Splendor' and 'Royal Rosa'), although the on-tree ripening process was delayed. In addition, the ripening process during cold storage was delayed in plums from OA-treated tress, manifested by lower firmness and acidity losses and reduced ethylene production, as compared with fruits from control trees. Antioxidant compounds (phenolics, anthocyanins and carotenoids) and the activity of antioxidant enzymes were higher in plums from OA-treated trees than in controls, at harvest and during 50 days of cold storage.
OA preharvest treatment could be a useful tool to maintain plum quality properties during long-term storage, by delaying the postharvest ripening process through a delay in ethylene production, with an additional effect on increasing bioactive compounds with health beneficial effects. © 2018 Society of Chemical Industry.
李子作为新鲜水果深受消费者喜爱，但贮藏寿命有限。由于活性氧（ROS）与果实成熟有关，因此增加 ROS 清除抗氧化系统可能会导致采后李子成熟延迟，并在长期冷藏后保持果实品质。
结果表明，采前草酸（OA）处理‘黑宝石’和‘皇家玫瑰’等李子品种可以提高作物产量（每棵树的千克数）和果实重量，尽管会延迟树上的成熟过程。此外，OA 处理树的李子在冷藏过程中的成熟过程被延迟，表现为硬度和酸度损失降低，乙烯生成减少，与对照树的果实相比。与对照相比，OA 处理树的李子在收获时和冷藏 50 天期间的抗氧化化合物（类黄酮、花青素和类胡萝卜素）和抗氧化酶活性更高。
OA 采前处理可以通过延迟乙烯生成来延迟采后成熟过程，从而在长期贮藏过程中保持李子的品质特性，这对增加具有有益健康作用的生物活性化合物有额外的影响。 © 2018 英国化学学会。
