食品科学

• 基础研究 • 上一篇    下一篇

大米肽的绝对分子质量与氨基酸组成及体外活性

王 申,林利美,周 佳,余雅芹,吴永宁,宫智勇*   

  1. 武汉工业学院食品科学与工程学院,湖北 武汉 430023
  • 出版日期:2013-07-15 发布日期:2013-06-28
  • 通讯作者: 宫智勇
  • 基金资助:

    国家“863”计划项目(2010AA023003)

Absolute Molecular Weight, Amino Acid Composition and Bioactivity in vitro of Rice Peptide

WANG Shen,LIN Li-mei,ZHOU Jia,YU Ya-qin,WU Yong-ning,GONG Zhi-yong*   

  1. College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China
  • Online:2013-07-15 Published:2013-06-28
  • Contact: GONG Zhi-yong

摘要:

以大米为原料制取大米肽,探讨其绝对分子质量与氨基酸组成及体外活性。通过碱性蛋白酶和胰蛋白 酶分步酶解的方法从大米蛋白中获得大米肽;多角度激光散射仪与高效凝胶渗透色谱联用测定大米肽的绝对分 子质量分布;柱后衍生高效液相色谱法(HPLC)测定大米肽的氨基酸组成;清除DPPH自由基法、氧自由基吸收 能力(ORAC)法评价其抗氧化性;高效液相色谱法评价其对血管紧张素转化酶(ACE)的抑制活性。结果表明:大 米肽绝对分子质量主要分布范围在549~1158之间;氨基酸组成丰富,必需氨基酸含量为35.610%,疏水氨基酸 含量为45.200%,氨基酸组成中谷氨酸含量最高,含量为16.100%;大米肽具有较强的抗氧化能力,清除DPPH 自由基IC50为1.170mg/mL,ORAC值为1568.006μmol Trolox/g;大米肽同时也具有较高的ACE抑制活性,其IC50为 0.057mg/mL。因此大米肽具有较好的抗氧化性和ACE抑制活性。

关键词: 大米肽, 绝对分子质量, 氨基酸组成, 抗氧化活性, ACE抑制活性

Abstract:

Absolute molecular weight, amino acid composition and bioactivity in vitro of rice peptide were investigated in
this study. Rice protein was hydrolyzed using alcalase and trypsin to obtain rice peptide. Multi-angle laser light scattering
combined with gel permeation chromatography (GPC/MALLS) was used to determine the absolute molecular weight of rice
peptide. High performance liquid chromatography (HPLC) with post-column derivatization technique was used to analyze
rice peptide for amino acid composition. The antioxidant activity of rice peptide was evaluated based on oxygen radical
absorbance capacity (ORAC) assays and DPPH free radical-scavenging capacity and the angiotensin Ⅰ-converting enzyme
(ACE) inhibitory activity was determined by HPLC. The results showed that the absolute molecular weight of rice peptide
mainly distributed from 549 to 1158. Rice peptide contained a full range of amino acids , and essential amino acids and
hydrophobic amino acids accounted for 35.610% and 45.200% of the total amino acids, respectively. The most abundant
amino acid was glutamic acid, accounting for 16.100% of the total amino acids. Rice peptide could eliminate free radicals
effectively and the IC50 for DPPH free radical was 1.170 mg/mL with ORAC value of 1568.006 μmol Trolox/g. In addition,
it had strong ACE inhibitory activity with IC50 of 0.057 mg/mL. Therefore, rice peptide has excellent antioxidant activity and
ACE inhibitory activity and therefore deserves further comprehensive exploitation and application.

Key words: rice peptide, absolute molecular weight, amino acid compositions, antioxidant activity, ACE inhibitory activity

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