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Study on Phenolics and Antioxidant Activity in Epicuticular Wax of Cold-Storage Apples

Author: ShaoJianPing
Tutor: ZhangYuanHu
School: Shandong Agricultural University
Course: Botany
Keywords: Apple 1-MCP Phenolics Antioxidant activity
CLC: S661.1
Type: Master's thesis
Year: 2008
Downloads: 224
Quote: 5
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Abstract


In this paper, the 1-MCP and DPA treatment on apple wax phenolics and its antioxidant activity, and the effect onα-farnesene and conjugated trines, and also MDA and O2-·content. The main results are as following:1 DPA and Ethoxyquin can effectively scavenge radical in vitro. The·OH and ABTS+·scavenging ability of DPA is stronger, while lower O2-· and DPPH·scavenging activity than Ethoxyquin. The IC50 value of DPA and Ethoxyquin is smaller than Trolox and quercetin, while the·OH scavenging ability is similar as that of Trolox and quercetin. It says that the O2-· And DPPH·scavenging activity of DPA and Ethoxyquin are stronger than that of quercetin; In all the 4 drugs, the TEAC value of DPA, Ethoxyquin and quercetin are all bigger than that of Trolox, it says that the ABTS+·scavenging activity of the first 3 drugs are all bigger than that of Trolox.2 During the first 4 weeks, the apple wax phenolics content and antioxidant activity gradually increased, and than declined. The 1-MCP and DPA treated apple wax have higher phenolics content, and also higher antioxidant activity. And phenolics content and antioxidant activity showed significant positive correlation.3 The investigated treatment improved the phenolics content and antioxidant activity, and after investigates phenolics content and antioxidant activity showed significant positive correlation.4 1-MCP and DPA treatment inhibit the produce ofα-farnesene and conjugated trines, the peak time of theα-farnesene and conjugated trines in peel is later than that of in wax. 5 1-MCP and DPA treatment inhibit the produce of MDA and O2-· in apple peel and wax, made the radicals in apple at a lower level.

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CLC: > Agricultural Sciences > Gardening > Fruit trees gardening > Pome > Apple
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