食品科学

• 生物工程 • 上一篇    下一篇

具有α-淀粉酶抑制活性的白芸豆多肽的制备及其热稳定性研究

訾 艳,王常青*,陈晓萌,陈 彤,李小凡,郝志萍,于文娟   

  1. 山西大学生命科学学院,山西 太原 030006
  • 出版日期:2015-07-15 发布日期:2015-07-08

Preparation and Thermal Stability of White Kidney Bean Polypeptide with α-Amylase Inhibitory Activity

ZI Yan, WANG Changqing*, CHEN Xiaomeng, CHEN Tong, LI Xiaofan, HAO Zhiping, YU Wenjuan   

  1. College of Life Science, Shanxi University, Taiyuan 030006, China
  • Online:2015-07-15 Published:2015-07-08

摘要:

以白芸豆为原料,酶法制备多肽。以α-淀粉酶抑制率为指标,比较酸性、中性和碱性蛋白酶的酶解效果。结果表明:3.350酸性蛋白酶的酶解效果最好。通过加酶量、酶解pH值、酶解温度和酶解时间的单因素试验和正交试验,得到制备白芸豆多肽的最佳工艺条件为:加酶量3 200 U/g、酶解pH 2.2、酶解温度55 ℃、酶解时间60 min,此条件下白芸豆多肽α-淀粉酶抑制率为80.82%。热稳定性研究表明,白芸豆多肽的热稳定性高于α-淀粉酶抑制剂(α-amylase inhibitor,α-AI)粗提液,该多肽在85、90 ℃条件下的α-淀粉酶抑制活性能保持更长时间。凝胶电泳分析表明白芸豆多肽的分子质量为7.53~9.09 ku。

关键词: 白芸豆清蛋白, &alpha, -淀粉酶抑制剂, 多肽, &alpha, -淀粉酶抑制活性, 热稳定性

Abstract:

In this study, white kidney bean was used as the raw material to prepare polypeptide with α-amylase inhibitory
activity by enzymatic hydrolysis. The hydrolysis efficiencies of acidic, neutral and alkaline protease for α-amylase inhibitor
(α-AI) activity were compared to determine 3.350 acidic protease as the best enzyme. Using combination of single factor
and orthogonal array designs an enzyme dosage of 3 200 U/g, an initial pH of 2.2 and 60 min hydrolysis at 55 ℃ were found
to be optimal to obtain the maximum α-amylase inhibitory rate of 80.82%. White kidney bean polypeptide derived from
α-AI extract had higher thermal stability than α-AI extract, and the α-amylase inhibitory activity of the polypeptide could be
maintained for a longer time at 85 and 90 ℃. Electrophoretic analysis showed that the molecular weight of white kidney
bean polypeptide was 7.53–9.09 ku.

Key words: white kidney bean albumin, α-amylase inhibitor (α-AI), polypeptide, α-amylase inhibitory activity, thermal stability

中图分类号: