食品科学 ›› 2002, Vol. 23 ›› Issue (1): 43-47.

• 基础研究 • 上一篇    下一篇

大豆分离蛋白酶解物清除羟自由基作用的研究

 陈美珍, 余杰, 郭慧敏   

  1. 汕头大学生物系
  • 出版日期:2002-01-15 发布日期:2012-02-13

Study on the Scavenging Activity on Hydroxyl Radical of Enzymic Hydrolysates of Soy Protein Isolates

 CHEN  Mei-Zhen, YU  Jie, GUO  Hui-Min   

  • Online:2002-01-15 Published:2012-02-13

摘要: 用比色法测定了大豆分离蛋白(SPI)酶解物对羟自由基的清除作用。结果表明,SPI酶解物对Fenton体系产生的•OH自由基有清除活性。SPI经木瓜蛋白酶水解15min,其酶解物清除能力已达最大值,为56.5%;经SephadexG-50凝胶柱分离,所得肽段各组分间的清除活性存在明显差异;用SDS-PAGE凝胶电泳测定各组分的分子量,结果显示分子量在11.355KD~5.154KD的肽段清除能力最强,达60.4%。

关键词: 大豆分离蛋白, 酶解物, 羟自由基, 清除活性

Abstract: The scavenging activity of enzymic hydrolysates of the soy protein isolates on hydroxyl radical (•OH)of Fenton reaction was studied by colorimetric.The results showed that the hydrolysates could scavenge •OH.The hydrolysates of hydrolyzed SPI by using papain for 15min showed the strongest scavenging activity as 56.5%.The mixed hydrolysates were fractionaled with a sephdes G-50 resin with considerable variations in antioxidant actvity existed among different peptide fractions.Molecular weights of the fractions were measured by sodium dodecyl sulfate-Polyacrylamide gel electrophoresis,and showed that the polypeptides at 11.355KD~5.154KD had the best antioxidant activity with the sangnging activity on hydroxyl radical as 60.4%.

Key words: Soy protein isolates , Enzymic hydrolysates , Hydroxyl radical , Scavenging activity