Abstract
The work aims to explore the effects of exogenous melatonin treatment on the antioxidant system and nitric oxide synthesis pathway of fresh-cut pears. The Crown pear slices were used as materials, soaked in 0, 50, 100, 150 μmol/Lmelatonin, respectively. Compared with the control group, melatonin treatment improved chromatic aberration, inhibited the respiration and the ethylene production of fresh-cut pears, and reduced the changes in soluble solids content, the total number of colonies, mold and yeast counts of fresh-cut pears. Melatonin treatment inhibited the activities of polyphenol oxidase and peroxidase, improved the activities of catalase, ascorbate peroxidase and superoxide dismutase, thereby reducing the active oxygen content. And at the same time, melatonin treatment increased the ratio of oxidized glutathione to reduced glutathione, and the ratio of ascorbic acid to dehydroascorbic acid, and enhanced the activities of glutathione reductase, monodehydroascorbate reductase and dehydroascorbate reductase. The activity of nitrate reductase and nitrite content of fresh-cut pears with melatonin treatment were not significantly different from that of the control group, while the activity of nitric oxide synthase and L-arginine content were significantly increased. The results show that 100 μmol/L melatonin has the most significant antioxidant and fresh-keeping effects on fresh-cut pears. This is a good method to inhibit the browning of fresh-cut pears and maintain the quality of fresh-cut pears.
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KONG Yu-jiao, ZHOU Hui, ZHU Shu-hua.
Effects of Melatonin on Antioxidant System and NO Synthesis Pathway of Fresh-cut Pear[J]. Packaging Engineering. 2021(3): 1-11 https://doi.org/10.19554/j.cnki.1001-3563.2021.03.001
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