为了研究红枣的抗氧化活性,以体积分数为80%的甲醇为溶剂,测定了红枣不同部位(枣肉、枣核和枣皮)甲醇提取液中的总酚含量和总黄酮含量,采用体外法,评价了红枣甲醇提取物的总抗氧化能力及对DPPH.和羟基自由基(.OH)的清除能力。结果表明:红枣枣皮甲醇提取液的总酚和总黄酮含量显著高于枣肉和枣核,其总抗氧化能力、对DPPH.和.OH的清除率也较高,且红枣各甲醇提取液的总酚、总黄酮含量与其抗氧化活性具有一定的相关性。

To evaluate the antioxidant activity of jujube,the total phenolic and flavanoid contents of extracts obtained by 80 % methanol(v/v) from different parts of jujube(pulp,seed and peel) are determined.the total antioxidant activity,1,1-diphenyl-2-picrylhydrazyl radical(DPPH·) scavenging activity and hydroxyl(·OH) radical scavenging activity are evaluated in vitro.The results indicate that the extracts of jujube peel showed higher total phenolic and flavanoid contents and the stronger total antioxidant power and DPPH· and ·OH scavenging activity than those from pulp and seed.Furthermore,the antioxidant activity are significantly correlated with total phenolic and flavanoid contents.