食品科学 ›› 2008, Vol. 29 ›› Issue (11): 451-455.

• 生物工程 • 上一篇    下一篇

萝卜中芥子苷酶的特性研究

 李洁, 王清章, 周绮, 孙银, 谢笔钧   

  1. 华中农业大学食品科技学院;
  • 出版日期:2008-11-15 发布日期:2011-12-08

Study on Properties of Myrosinase from Radish

 LI  Jie, WANG  Qing-Zhang, ZHOU  Qi, SUN  Yin, XIE  Bi-Jun   

  1. College of Food Science and Technology,Huazhong Agricultural University,Wuhan 430070,China
  • Online:2008-11-15 Published:2011-12-08

摘要: 以萝卜籽提取液中的硫代葡萄糖甙为底物,对萝卜中芥子苷酶的特性进行了研究。结果表明,萝卜中芥子苷酶的最适反应温度为50℃,最适pH值为4.0和8.0。抗坏血酸具有激活芥子苷酶的作用,在抗坏血酸浓度为5mmol/L时酶活力最大,达107U。L-半胱氨酸和谷胱甘肽也能使芥子苷酶的活性有较显著的提高。NaCl、Na2SO3和柠檬酸对该酶有抑制作用,Fe2+、Mg2+、Al3+、Ca2+对芥子苷酶的影响作用因离子类型不同而异。

关键词: 萝卜, 芥子苷酶, 酶学特性

Abstract: Using glucosinolates from radish seed extract as substrate,the properties of myrosinase from radish were investigated.Results indicated that the optimum temperature of myrosinase is 50℃,and the optimum pH values are 4.0 and 8.0.Ascorbic acid can activate the enzyme,whose activity reaches a climax of 107 U at the ascorbic acid concentration of 5 mmol/L.L-Cysteine hydrochloride and glutathione also increase the myrosinase activity.However,NaCl,Na2SO3 and citric acid have inhibitory effects on the enzyme activity.Fe2+,Mg2+,Al3+ and Ca2+ have different effects on the myrosinase with different kinds of metal ions.

Key words: radish, myrosinase, enzymatic properties