食品科学 ›› 2010, Vol. 31 ›› Issue (1): 172-176.doi: 10.7506/spkx1002-6630-201001040

• 生物工程 • 上一篇    下一篇

三疣梭子蟹酚氧化酶的生化特性研究

郑 丹1,段青源2 ,* ,朱励华1,钟惠英1,杨家锋1,汪 杰1   

  1. 1.宁波市渔业环境与产品质量检验监测中心 2.宁波市海洋与渔业研究院
  • 收稿日期:2009-03-17 出版日期:2010-01-01 发布日期:2014-05-19
  • 通讯作者: 郑丹 E-mail:sustzhd@yahoo.com.cn
  • 基金资助:

    宁波市海洋渔业科技项目[甬海(2006)160 号]

Biochemical Characteristics of Phenoloxidase from Portunus trituberculatus

ZHENG Dan1,DUAN Qing-yuan2,*,ZHU Li-hua1,ZHONG Hui-ying1,YANG Jia-feng1,WANG Jie1   

  1. 1. Ningbo Inspection and Monitor Centre for Product Quality and Fishery Environment, Ningbo 315012, China ;
    2. Ningbo Academy of Ocean and Fishery, Ningbo 315012, China
  • Received:2009-03-17 Online:2010-01-01 Published:2014-05-19
  • Contact: ZHENG Dan1 E-mail:sustzhd@yahoo.com.cn

摘要:

对三疣梭子蟹酚氧化酶的生化特性进行研究。结果表明:以邻苯二酚为底物,酚氧化酶在pH7.8~8.4时最稳定,最适pH 值为8.2。温度55℃时,酚氧化酶活力最大,在25~40℃时,热稳定性最好。酶促褐变反应动力学符合米氏方程,温度为30℃,pH7.2 时,米氏常数Km=0.531mol/L,最大反应速率0.049 A530nm/min。选用的12 种抑制剂对三疣梭子蟹酚氧化酶均有一定的抑制效果,以植酸抑制效果最强,焦亚硫酸钠、L- 半胱氨酸、草酸次之,抗坏血酸效果较好。

关键词: 三疣梭子蟹, 酚氧化酶, 褐变

Abstract:

Crude phenoloxidase (PO) was extracted from Portunus trituberculatus and characterized biochemically. This enzyme exhibited an optimal pH of 8.2 and temperature of 55 ℃ for catalyzing the oxidation of pyrocatechol as a substrate. Optimal enzyme stability was observed in the ranges of pH 7.8-8.4 and 25-40 ℃. Browning reaction catalyzed by this enzyme obeyed the Michaelis-Menten equation. The values of Km and Vmax at 30 ℃ and pH 7.2 were calculated to be 0.531 mol/L and 0.049 A530nm/min, respectively. Twelve inhibitors tested all had a certain inhibitory effect against this enzyme, among which phytic acid was the strongest inhibitor, followed in turn by sodium metabisulfite, L-cysteine, oxalic acid and ascorbic acid.

Key words: Portunus trituberculatus, phenoloxidase, melanin

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