食品科学

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抗氧化肽HDHPVC和HEKVC的反应动力学及抗氧化能力评价方法

蒋海萍,廖丹葵*,孙建华,童张法   

  1. 广西大学化学化工学院,广西 南宁 530004
  • 出版日期:2014-09-15 发布日期:2014-09-12

Kinetic Studies of DPPH Radical Scavenging Activity of Antioxidative Peptides HDHPVC and HEKVC

JIANG Hai-ping, LIAO Dan-kui*, SUN Jian-hua, TONG Zhang-fa   

  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
  • Online:2014-09-15 Published:2014-09-12

摘要:

研究抗氧化肽His-Asp-His-Pro-Val-Cys(HDHPVC)、His-Glu-Lys-Val-Cys(HEKVC)和谷胱甘肽(glutathione,GSH)清除1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基的反应动力学特性。3 种抗氧化肽的二级反应动力学常数k2、抗氧化还原能力(antiradical power,ARP)及化学计量数等结果表明,其清除DPPH自由基能力的排列顺序为HEKVC<HDHPVC<GSH。通过比较3 种抗氧化肽在稳定状态及固定30 min反应时间条件下清除DPPH自由基能力检测方法的差异,发现3 种抗氧化肽均属于慢反应动力学行为,固定30 min反应时间所测得的半数有效浓度(median effective concentration,EC50)比稳态条件下测得值偏大3~5 倍。该研究表明HDHPVC和HEKVC是一种优良的天然抗氧化肽。

关键词: His-Asp-His-Pro-Val-Cys, His-Glu-Lys-Val-Cys, DPPH自由基, 抗氧化, 动力学

Abstract:

The kinetic behavior of two antioxidative peptides, His-Asp-His-Pro-Val-Cys (HDHPVC) and His-Glu-Lys-
Val-Cys (HEKVC), as well as glutathione (GSH) for their DPPH radical scavenging activity was investigated. Three
kinetic parameters of the two antioxidative peptides, including second-order rate constant (k2), antiradical power (ARP)
and stoichiometry were calculated and compared with those of GSH. Results showed that the antioxidative capacity was
sequenced as HEKVC<HDHPVC<GSH. All of them were considered to belong to slow kinetics behavior and showed a 3–5
folds higher EC50 than at the steady state. It is concluded that HDHPVC and HEKVC are excellent natural antioxidants.

Key words: His-Glu-Lys-Val-Cys, His-Glu-Lys-Val-Cys, DPPH free radical, antioxidant, kinetics

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