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茶叶科学 ›› 2008, Vol. 28 ›› Issue (6): 436-442.doi: 10.13305/j.cnki.jts.2008.06.011

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EGCG氧化产物不同级分的分析及其抗氧化活性的研究

戚向阳1,2   

  1. 1. 浙江万里学院生物与环境学院,浙江 宁波 315100;
    2. 华中农业大学食品科技学院,湖北 武汉 430070
  • 收稿日期:2008-06-16 出版日期:2008-12-15 发布日期:2019-09-12
  • 作者简介:戚向阳(1968— ),女,湖北武汉人,博士,教授,主要从事食品化学与天然产物化学的研究。qixiangyang85@sina.com
  • 基金资助:
    国家十一五重点支撑项目(NO 2006BAD27B00)

Study on the Analysis and Antioxidant Activities of Different Extracts from (-)-Epigallocatechin Gallate Oxidation Products

QI Xiang-yang1,2   

  1. 1. College of Biological Environmental Sciences, Zhejiang Wali College, Ningbo 315100, China;
    2. Department of food science and technology of Huazhong Agricultural University, Wuhan 430070, China
  • Received:2008-06-16 Online:2008-12-15 Published:2019-09-12

摘要: 利用乙酸乙酯在中性和酸性条件下萃取EGCG氧化产物,得到级分A(EOPA)和级分B(EOPB),用化学发光法比较EGCG与EOPA、EOPB的抗氧化活性及其对DNA损伤的保护作用,并通过HPLC-MS分析两级分中的氧化产物。结果表明EGCG及EOPA、EOPB均有较好的清除活性氧和保护DNA损伤的活性,其中EOPA的活性强于未氧化的EGCG。HPLC-MS分析表明,EOPA、EOPB级分中的氧化产物均为二聚体。

关键词: EGCG氧化产物, 化学发光, 抗氧化, HPLC-ESI-MS

Abstract: (-)-Epigallocatechin gallate (EGCG) was oxidized chemically and extracted under neutral, acidic condition value to obtain two extracts: fraction A (EOPA) and fraction B (EOPB). The antioxidant activities of EOP A, EOP B and EGCG were determined using a chemiluminescence technique. The components of two fractions were analyzed by HPLC-ESI-MS. Results showed that the EOP A possessed the strongest antioxidant activity in all test system followed by EGCG, EOP B in a decreasing order. HPLC-ESI-MS analysis showed that the oxidation products of EOP A and EOPB were all dimmers.

Key words: EGCG, oxidation products, chemiluminescence, antioxidant activity, HPLC-ESI-MS

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