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Comparative profiling of primary metabolites and volatile compounds in Satsuma mandarin peel after ozone treatment

Wu, Qixian, Zhu, Xiangrong, Gao, Huijun, Zhang, Zhengke, Zhu, Hong, Duan, Xuewu, Qu, Hongxia, Yun, Ze, Jiang, Yueming
Postharvest biology and technology 2019 v.153 pp. 1-12
antibacterial properties, antioxidants, degreening, disease resistance, fruits, gas chromatography-mass spectrometry, metabolites, organic acids and salts, ozonation, ozone, postharvest storage, satsumas, shelf life, sugars, volatile compounds
Ozone treatment can effectively delay the decay of many fruit during postharvest storage. However, little is known about the ozone-induced metabolites. In this study, Satsuma mandarin fruit were treated with 2 μg L−1 ozone gas for 5 h. Results showed that ozone treatment not only effectively delayed the fruit decay, but also significantly reduced fruit respiratory intensity, delayed fruit degreening and prolonged shelf-life of Satsuma mandarin fruit during postharvest storage. After gas chromatography coupled to mass spectrometry (GC–MS) analysis, a total of 96 metabolites were detected in Satsuma mandarin peel (albedo + flavedo), including 55 primary metabolites and 41 volatile compounds. After ozone treatment, the contents of many metabolites increased significantly at 1 d, mainly including soluble sugars and organic acids, which might play a regulatory role in ozone-induced fruit resistance. Moreover, a great number of metabolites related to antioxidant and antibacterial activity were also induced at 4 d by ozone treatment, which might effectively improve the disease resistance, delay the decay, and prolong the shelf life of Satsuma mandarin fruit.