食品科学 ›› 2009, Vol. 30 ›› Issue (23): 306-308.doi: 10.7506/spkx1002-6300-200923069

• 生物工程 • 上一篇    下一篇

杨梅霉变及其多酚酶特性与动力学研究

肖卓炳1,陈 上2,麻明友1,杨朝霞2,吴显明2,何则强2   

  1. 1.吉首大学 湖南省林产化工工程重点实验室 2.吉首大学化学化工学院
  • 收稿日期:2009-04-14 修回日期:2009-08-21 出版日期:2009-12-01 发布日期:2010-12-29
  • 通讯作者: 肖卓炳 E-mail:xiaoyddd@163.com
  • 基金资助:

    湖南省教育厅科学研究项目(08C670;06C654);湖南省自然科学基金项目(06JJ50161)

Characterization of Polyphenol Oxidase in Myrica rubra Fruits

XIAO Zhuo-bing1,CHEN Shang2,MA Ming-you1,YANG Zhao-xia2,WU Xian-ming2,HE Ze-qiang2   

  1. 1. Key Laboratory for Forest Products and Chemical Industry Engineering, Jishou University, Zhangjiajie 427000, China;
    2. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China
  • Received:2009-04-14 Revised:2009-08-21 Online:2009-12-01 Published:2010-12-29
  • Contact: XIAO Zhuo-bing E-mail:xiaoyddd@163.com

摘要:

测定不同贮藏时间的杨梅中的多酚物含量,并观察对应的软化霉变程度,对杨梅中的多酚氧化酶进行提取,研究其对各种底物的催化特性和适宜的酶催化反应条件,并测定催化反应的动力学参数。研究表明,常温下贮藏,杨梅霉变速率与果实中多酚化合物含量的变化相一致,霉变时多酚物含量因氧化显著减少。对其多酚氧化酶研究发现:其最佳底物是4- 甲基儿茶酚,其催化的反应可用单底物反应模型来描述,用氧电极测出酶催化反应的最佳条件是pH 值为7.1,温度为60℃,米氏常数为2.18 × 10-3mol/L,rmax=2.275mg/L·min。

关键词: 杨梅, 霉变, 多酚氧化酶, 反应动力学

Abstract:

The decrease of polyphenol content, in which polyphenol oxidase played an important role, were believed to related to the mildewing degree of Myrica rubra. In this paper, polyphenol oxidases in Myrica rubra were extracted and characterized. Results showed that the optimum substrate for polyphenol oxidase in Myrica rubra was 4-methylcatechol with the optimum pH 7.1 and optimum temperature 60℃, and Michaelis constant was 2.18×10- 3 mol/L with the max reaction rate (rmax) 2. 275 mg/L·min. The reaction mechanism can be described with monosubtrate reaction model.

Key words: Myrica rubra, mildewing, polyphenol oxidase, kenetics

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