华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (5): 53-57.

• 生物工程 • 上一篇    下一篇

香草醛对酪氨酸酶活性的抑制

龚盛昭 杨卓如 程江   

  1. 华南理工大学 化工与能源学院,广东 广州 510640
  • 收稿日期:2005-06-17 出版日期:2006-05-25 发布日期:2006-05-25
  • 通信作者: 龚盛昭(1970-),男,在职博士生,广东轻工职业技术学院副教授,主要从事精细化学品的开发和应用研究. E-mail:shengzhao2002@yahoo.com.cn
  • 作者简介:龚盛昭(1970-),男,在职博士生,广东轻工职业技术学院副教授,主要从事精细化学品的开发和应用研究.
  • 基金资助:

    广东省自然科学基金资助项目(011563,040201 14)

Inhibition of Tyrosinase Activity by Vanillin

Gong Sheng-zhao  Yang Zhuo-ru  Cheng Jiang   

  1. College of Chemical and Energy Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-06-17 Online:2006-05-25 Published:2006-05-25
  • Contact: 龚盛昭(1970-),男,在职博士生,广东轻工职业技术学院副教授,主要从事精细化学品的开发和应用研究. E-mail:shengzhao2002@yahoo.com.cn
  • About author:龚盛昭(1970-),男,在职博士生,广东轻工职业技术学院副教授,主要从事精细化学品的开发和应用研究.
  • Supported by:

    广东省自然科学基金资助项目(011563,040201 14)

摘要: 在25℃,pH=6.8的Na2HPO4-NaH2 PO4 缓冲体系中,采用酶动力学方法研究了香草醛对酪氨酸酶单酚酶和二酚酶活性的抑制效应.实验结果表明:香草醛对酪氨酸酶单酚酶和二酚酶活性均有抑制作用,其半数抑制浓度(IC50)约分别为2.7和4.1 mmol/L;香草醛能明显延长单酚酶的迟滞时间,4mmol/L香草醛能使迟滞时间由1.1 min延长至3min;Lineweaver-Burk图显示香草醛对二酚酶的抑制作用表现为混合性抑制,对游离酶的抑制常数和对酶一底物络合物的抑制常数分别为3.48和15.1 mmol/L.

关键词: 香草醛, 酪氨酸酶, 活性, 抑制作用, 酶动力学, 单酚酶, 二酚酶

Abstract:

The inhibitory effect of vanillin on the activities of monophenolase and diphenolase contained in tyrosinase was studied by means of the enzymological kinetic method in a Na2HPO4-NaH2 PO4 buffer solution with pH 6.8 at 25 ℃.The results show that the activities of both monophenolase and diphenolase are inhibited by vanillin.with the vanillin concentration leading to 50% of inhibitmy rate(IC5o)respectively being 2.7 and 4.1 mmol/L,that vanillin extends the lag time of monophenolase for oxidation from 1.1 to 3 min in a vanillin concentration of 4 mmol/L.and that the inhibitory efect of vanillin on diphenolase is in a mixed mode.which is proved by Lineweaver-Burk plots.Moreover,the inhibiting constants for the inhibitor binding with free enzyme and enzyme—substrate complex are respectively 3.48 and 15.1 mmo1/L.

Key words: words, vanillin, tyrosinase, activity, inhibitory efect, enzymological kinetics, monophenolase, dipheno, ase