食品科学 ›› 2008, Vol. 29 ›› Issue (12): 141-145.

• 基础研究 • 上一篇    下一篇

儿茶素氧化产物的分离鉴定及其抗氧化活性研究

 李春美, 窦宏亮, 陈美红, 万琼红, 赵洪雷   

  1. 华中农业大学食品科技学院;
  • 出版日期:2008-12-15 发布日期:2011-12-08

Study on Separation,Identification and Antioxidant Activities of Tea Catechin Oxidation Products

LI  Chun-Mei, DOU  Hong-Liang, CHEN  Mei-Hong, WAN  Qiong-Hong, ZHAO  Hong-Lei   

  1. College of Food Science and Technology,Huazhong Agricultural University,Wuhan 430070,China
  • Online:2008-12-15 Published:2011-12-08

摘要: 采用H2O2模拟氧化体系制备儿茶素氧化产物,经多级柱色谱分离得到一相对纯组分(tR为9.825min),HPLC-MS分析结果表明,所得级分主要含m/z471及m/z939两种产物,m/z471是EGCG分子上脱去2个氢原子,再加上一个氧原子形成,即[M+14-H]-,m/Z939为其二聚体,即[2M-3H]-。抗氧化活性测定结果表明,此氧化产物对不同体系(甲基紫体系、2-脱氧-D-核糖体系、水杨酸体系和邻苯三酚-鲁米诺化学发光体系)产生的羟自由基(·OH)和超氧阴离子自由基(O-2·)具有很强的清除作用,对前三个体系产生的羟自由基(·OH)的清除率分别为96.46%、84.8%、81.9%,在邻苯三酚-鲁米诺化学发光体系中对超氧阴离子自由基(O-2·)的清除率为97.0%,均高于同一体系下等浓度茶多酚。

关键词: 儿茶素氧化产物, 分离, 鉴定, 抗氧化活性

Abstract: Tea catechin oxidation products(TCOP) with the retention time of 9.825 min were separated from H2O2 model oxidation system using multistage column chromatography and they were identified to be two products with m/z 471 and m/z 939 using HPLC/ESI-MS/MS. The oxidation product with m/z 471 is found to be a product from epigallocatechin gallate(EGCG) by eliminating two hydrogen atoms and adding one oxygen atom,and the product with m/z 939 is its dimer. The antioxidant activities of the oxidation products were measured in different systems. The results showed that the tea catechin oxidation products have very strong antioxidant activity in all tested systems. The scavenging rates of the oxidation products on hydroxyl free radical(·OH) generated in methyl violet color metric system,2-deoxy-D-ribose system and salicylic acid system are 96.46%,84.8% and 81.9%,respectively,and the scavenging rate on superoxide anion(O2·) generated in luminescence of pyragollic acid-Luminol system is 97.0%. The antioxidant activities of the oxidation products are much stronger than those of tea polyphenol at the same concertration in all tested systems.

Key words: catechin oxidation products, separation, identification, antioxidant activity