食品科学 ›› 2010, Vol. 31 ›› Issue (21): 105-109.doi: 10.7506/spkx1002-6630-201021024

• 基础研究 • 上一篇    下一篇

芸豆肽的抗氧化活性研究

任海伟1,朱冬梅2,王玉丽1,袁亚兰1,高瑜璟1,苏雪艳1   

  1. 1.兰州理工大学生命科学与工程学院 2.兰州理工大学技术工程学院
  • 收稿日期:2010-01-05 出版日期:2010-11-15 发布日期:2010-12-29
  • 通讯作者: 任海伟 E-mail:rhw52571119@163.com

Antioxidant and Free Radical-scavenging Activities Bean Peptides (KBP)

REN Hai-wei1,ZHU Dong-mei2,WANG Yu-li1,YUAN Ya-lan1,GAO Yu-jing1,SU Xue-yan1   

  1. 1. College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. College of Technology Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2010-01-05 Online:2010-11-15 Published:2010-12-29
  • Contact: REN Hai-wei E-mail:rhw52571119@163.com

摘要:

采用Sephadex-G50 凝胶柱层析分离具有强抗氧化活性的小分子芸豆肽,以VC 为对照,研究3 种肽分离组分的还原能力及对羟自由基、超氧阴离子自由基和DPPH 自由基的清除能力。结果表明:随着相对分子质量的减小和肽质量浓度的增加,其还原能力及对羟自由基、超氧阴离子自由基和DPPH 自由基的清除能力逐渐增大;小分子芸豆肽(C 组分)的还原能力低于VC;对羟自由基、超氧阴离子自由基和DPPH 自由基的半清除质量浓度分别为2.301、2.553、1.386mg/mL。该小分子肽组分的相对分子质量主要集中在100~1000,该组分疏水性氨基酸含量为36.78%,其疏水值达到364.73 kcal/mol。说明小分子肽组分的抗氧化活性与其氨基酸种类和组成、相对分子质量分布密切相关。

关键词: 芸豆肽, 抗氧化活性, 自由基清除能力, 氨基酸组成, 相对分子质量分布

Abstract:

Kidney bean peptides (KBP) were fractionated by gel filtration on SephadexG-50.The antioxidant and free radicalscavenging activities of three KBP fractions (Fra-A, Fra-B, Fra-C) were investigated using reducing power and 1,1-diphenyl- 2-pycrylhydrazyl (DPPH)/superoxide/hydroxyl radical-scavenging assay. The reducing power activity of Fra-C (RP50 2.263 mg/mL) was lower than that of ascorbic acid (RP50 0.828 mg/mL). Fra-C showed the strongest scavenging activity against DPPH, superoxideanion and hydroxyl radicals. The radical-scavenging effect was in a dose-dependent manner and the EC50 values for DPPH, superoxide and hydroxyl radicals were found to be 2.301, 2.553 mg/mL and 1.386 mg/mL, respectively. The amino acid analysis showed that Fra-C had a hydrophobic amino acid content of 36.78% and a hydrophobicity of 364.73 kcal/mol.The molecular weight distribution of Fra-C was found to mainly vary from 100 to 1000. The antioxidant activity of Fra-C is clearly related to the amino acid composition, the content of THAA and the molecular mass.

Key words: kidney bean peptides (KBP), antioxidant activity, free radical-scavenging activity, amino acid composition, molecular weight distribution

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