食品科学

• 生物工程 • 上一篇    下一篇

胰蛋白酶制备鹰嘴豆抗氧化肽的条件优化

施文卫1,王 伟2,胡 冰1,周 莉1,曾晓雄1,孙 怡1,*   

  1. 1.南京农业大学食品科技学院,江苏 南京 210095;2.新疆农业大学食品科学与药学学院,新疆 乌鲁木齐 830052
  • 出版日期:2016-08-15 发布日期:2016-08-30

Optimal Preparation of Antioxidant Peptides by Enzymatic Hysrolysis of Chickpea Protein Isolate with Trypsin

SHI Wenwei1, WANG Wei2, HU Bing1, ZHOU Li1, ZENG Xiaoxiong1, SUN Yi1,*   

  1. 1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China;
    2. College of Food Science and Pharmacy, Xinjiang Agricultural University, Ürümqi 830052, China
  • Online:2016-08-15 Published:2016-08-30

摘要:

以碱溶酸沉法制备的鹰嘴豆分离蛋白为酶解底物,以超氧阴离子自由基清除率为响应值,采用响应面法优化胰蛋白酶制备鹰嘴豆抗氧化活性肽的条件。结果表明:在整个酶解过程中,所制备的鹰嘴豆抗氧化肽具有显著的抗氧化活性,胰蛋白酶制备鹰嘴豆抗氧化肽的最佳酶解条件为:底物质量分数2%、加酶量([E]/[S])1 800 U/g、温度32 ℃、pH 7.0、时间35 min。此条件下所制备的鹰嘴豆抗氧化肽的超氧阴离子自由基清除率为67.59%。鹰嘴豆分离蛋白水解液经超滤膜系统纯化获得了截留相对分子质量1 kD以下的水解液,并通过液相色谱-质谱联用分析,发现了一种相对分子质量为668.40、序列为RQLPR的亲水性五肽。

关键词: 鹰嘴豆分离蛋白, 胰蛋白酶, 抗氧化, 响应面法

Abstract:

Response surface methodology was employed to optimize the preparation conditions of antioxidant peptides
by enzymatic hydrolysis of chickpea protein isolate (CPI), prepared by alkaline extraction and acid precipitation from
chickpea seeds, with trypsin. The response variable was the percentage scavenging of superoxide anion radical. The results
showed that all samples collected throughout the hydrolysis process had significant antioxidant activity and the optimal
conditions were determined as substrate concentration 2%, enzyme/substrate ([E]/[S]) ratio 1 800 U/g, reaction time
35 min, temperature 32 ℃ and pH 7.0. Under these conditions, the percentage scavenging of superoxide anion radical
by chickpea antioxidant peptides was 67.59%. Chickpea peptide fractions with molecular weight cut-off of 1 kD from
chickpea protein hydrolysates by ultrafiltration were analyzed by liquid chromatography-mass spectroscopy (LC-MS).
A pentapeptide with molecular weight of 668.40 in chickpea peptide fractions was achieved, whose amino acid
sequence was determined to be RQLPR.

Key words: chickpea protein isolate, trypsin, antioxidant activity, response surface methodology

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