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茶叶科学 ›› 2006, Vol. 26 ›› Issue (2): 117-121.doi: 10.13305/j.cnki.jts.2006.02.008

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福建主要乌龙茶品种PPO酶活特性的研究

王丽霞1, 肖丽霞2, *, 陆蒸3, 林启训3, 陆则坚3   

  1. 1. 漳州师范学院生物系,福建 漳州,363000;
    2. 扬州大学食品科学与工程学院,江苏 扬州, 225009;
    3. 福建农林大学食品科技学院,福建 福州, 350002
  • 收稿日期:2005-11-03 修回日期:2006-03-02 出版日期:2006-06-25 发布日期:2019-09-10
  • 通讯作者: * 肖丽霞
  • 作者简介:王丽霞(1979- ),女,硕士研究生,从事茶叶加工及生化研究。
  • 基金资助:
    福建省自然科学基金资助项目(B9910010)

Research in Polyphenol Oxidase Activities of Major Oolong Tea Cultivars in Fujian

WANG Li-xia1, XIAO Li-xia2, *, LU Zheng3, LIN Qi-xun3, LU Ze-jian3   

  1. 1. Department of Biology, Zhangzhou Normal University, Zhangzhou 363000, China;
    2. College of Food Science and Engineering, Yangzhou University, Yangzhou 225009, Chian;
    3. College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2005-11-03 Revised:2006-03-02 Online:2006-06-25 Published:2019-09-10

摘要: 对四种乌龙茶茶树鲜叶的多酚氧化酶(PPO)进行粗提,测定并比较不同品种酶的特性。结果表明:在邻苯二酚与被测酶液的反应体系中,当底物邻苯二酚(C6H6O2)量为0.3~0.9βml时,毛蟹、铁观音、黄旦、肉桂酶活力随底物浓度的增加呈曲线增长,含量太高会产生抑制作用,当底物含量∶酶含量=1.5∶1时,酶活力表现最高;毛蟹、铁观音、黄旦、肉桂酶活力在45~65℃范围内均呈ω型变化趋势,依次在45℃、55℃、65℃时出现高峰。在50~90℃下水浴处理1βh,毛蟹、铁观音、黄旦、肉桂酶活力分别丧失34.66%~55.91%,22.68%~50.89%,23.14%~53.57%,31.58%~57.89%;酶活力的适宜pH相对偏碱,在pH8.6时表现为一个活力高峰。相同浓度的五种抑制剂对酶均有一定的抑制效果,其中NaHSO3对酶活力的抑制作用最强,L-半胱氨酸其次,NaCl的抑制效果最差。

关键词: 乌龙茶, 鲜叶, 多酚氧化酶

Abstract: Crude polyphenol oxidase (PPO) was separately obtained from Maoxie, Tieguanyin, Huangdan, Rougui, and enzymatic properties were examined. The results were as follows: PPO activities increased curvely with the increase of catechol substrate volume if the volume of catechol substrate ranged in 0.3~0.9βml, and decreased when catechol substrate content was greater than 0.9βml, in the reaction system; the enzymatic activities were highest when the ratio of catechol substrate content to PPO content was 1.5:1, the optimum temperature for PPO activities were 45℃、55℃、65℃ respectively, under the condition of 50~90℃ hot water treatment for 1βh, the PPO activities of Maoxie, Tieguanyin, Huangdan, Rougui decreased 34.66%~55.91%, 22.68%~50.89%, 23.14%~53.57%, 31.58%~57.89% respectively, PPO could act under alkaline conditions, the best enzymatic activity was detected under the condition of pH8.6; All the five inhibitors showed some degree of inhibition to PPO activities and the most effective inhibitor was NaHSO3, next to which was L-cysteine, while the most ineffective inhibitor was NaCl.

Key words: Oolong tea, fresh tea, polyphenol oxidase

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