Antioxidant activity and free radical-scavenging capacity of extracts from guava (Psidium guajava L.) leaves
Antioxidant activity and free radical-scavenging capacity of extracts from guava (Psidium guajava L.) leaves
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DOI：
10.1016/j.foodchem.2006.02.047
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发表时间：
2007-01-01
期刊：
影响因子：
8.8
通讯作者：
Yen, Gow-Chin
中科院分区：
文献类型：
--
作者：
Chen, Hui-Yin;Yen, Gow-Chin
本研究旨在探讨番石榴叶及果实干萃取物之抗氧化活性及清除自由基之功效。结果表明，通过添加浓度为100 μ g/ml的番石榴叶和番石榴茶提取物，94.4-96.2%的亚油酸氧化被抑制。番石榴干果提取物的抗氧化作用弱于叶提取物。结果表明，番石榴叶提取物对ABTS（中心点+）自由基和超氧阴离子的清除作用随浓度的增加而增强。番石榴叶提取物对过氧化氢自由基有明显的清除作用。但当提取物浓度大于10 μ g/ml时，其清除活性下降。不同番石榴品种叶提取物对自由基的清除作用强于市售番石榴茶提取物和干果提取物。色谱数据表明，番石榴提取物含有酚酸，如阿魏酸，这似乎是负责其抗氧化活性。相关性分析表明，番石榴叶提取物的抗氧化能力、清除自由基能力与酚类物质含量呈线性关系。(c)2006年由Elsevier Ltd.出版
The objectives of this study were to study the antioxidant activity and free radical-scavenging effects of extracts from guava leaves and dried fruit. The results indicated that 94.4-96.2% of linoleic acid oxidation was inhibited by the addition of guava leaf and guava tea extracts at a concentration of 100 mu g/ml. The guava dried fruit extracts exhibited weaker antioxidant effects than did the leaf extracts. The results also demonstrated that the scavenging effects of guava leaf extracts on ABTS(center dot+) radicals and superoxide anion increased with increasing concentrations. The guava leaf extracts displayed a significant scavenging ability on the peroxyl radicals. However, the scavenging effects were decreased when the extract concentration was greater than 10 mu g/ml. The extracts from leaves of various guava cultivars exhibited more scavenging effects on free radicals than did commercial guava tea extracts and dried fruit extracts. The chromatogram data indicated that guava extracts contained phenolic acids, such as ferulic acid, which appeared to be responsible for their antioxidant activity. Correlation analysis indicated that there was a linear relationship between antioxidant potency, free radical-scavenging ability and the content of phenolic compounds of guava leaf extracts. (c) 2006 Published by Elsevier Ltd.