硬脂酰氯改性对核桃青皮多酚纯化物抗氧化功效的影响

Effect of stearyl chloride modification on antioxidation of purified polyphenols extracts from green husk of walnut

通过对比核桃青皮多酚纯化物及其硬脂酰氯改性产物的还原力、体外清除自由基能力以及抗油脂氧化能力,分析硬脂酰氯改性对核桃青皮多酚纯化物抗氧化功效的影响。结果表明:核桃青皮多酚纯化物具有较强的抗氧化能力;在所选的浓度范围中,除了DPPH自由基清除率外,核桃青皮多酚纯化物和改性后的物质的还原力、羟基自由基、ABTS自由基与亚硝酸盐清除能力以及抗油脂氧化能力均大于V_C和BHT;核桃青皮多酚纯化物改性后,其还原力和体外清除自由基能力均低于改性前,但其抗油脂氧化能力比改性前增强。

In this article, the effect of stearyl chloride modification on antioxidation of purified polyphenols ex- tracts from green husk of walnut was studied by comparing the reducing power, free radicals scavenging ability in vitro and anti-lipid oxidation capacity. The results showed that the purified polyphenols extracts from green husk of walnut has strong antioxidant activity. In the certain concentration ranges, except for the DPPH free radical scavenging abili- ty, the purified polyphenols extracts and its modified product exhibited stronger activities than Vc and BHT in terms of reducing power, hydroxyl radicals, ABTS free radical scavenging abitity and nitrite scavenging ability and anti-lipid oxidation capacity. The reducing power and free radicals scavenging ability of purified polyphenols extracts from green husk of walnut decreased after stearyl chloride modification. But anti-lipid oxidation capacity of modified extracts was improved compared to the purified polyphenols extracts.