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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (6): 463-468. 上一篇    下一篇

研究论文

过氧化氢调控藜芦醇介导木素过氧化物酶催化氧化邻苯三酚红研究

蓝靖，王芳，黄锡荣*，李越中，曲音波，高培基   

  1. (山东大学 1胶体与界面化学教育部重点实验室 2微生物技术国家重点实验室 济南 250100)
  • 投稿日期:2005-08-18 修回日期:2005-11-28 发布日期:2006-03-28
  • 通讯作者: 黄锡荣

Studies on the Hydrogen Peroxide Regulated Veratryl Alcohol Mediated Oxidation of Pyrogallol Red Catalyzed by Lignin Peroxidase

LAN Jing, WANG Fang, HUANG Xi-Rong*, LI Yue-Zhong, QU Yin-Bo, GAO Pei-Ji   

  1. (1 Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education of China, 2 State Key Laboratory of
    Microbial Technology of China, Shandong University, Jinan 250100)
  • Received:2005-08-18 Revised:2005-11-28 Published:2006-03-28
  • Contact: HUANG Xi-Rong

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木素过氧化物酶(LiP)催化H2O2氧化邻苯三酚红(PR)反应的氧化产物受H2O2与PR的摩尔比控制, H2O2与PR的摩尔比不同, 所得降解产物不一样. 分析表明, H2O2在LiP催化氧化PR过程中的双重作用(即低浓度的H2O2是LiP的激活剂, 高浓度的H2O2是LiP的抑制剂)是导致上述现象的根本原因. 藜芦醇(VA)对LiP催化氧化PR的反应有促进作用, 尤其是当H2O2与PR的摩尔比较高时这种促进作用更为明显; 然而PR对LiP催化氧化VA的反应却有抑制作用. 后者可以用来解释为什么在用白腐菌降解染料时在培养液中常常检测不到LiP的藜芦醇活力. 分析表明, VA的存在不但促进了LiP酶中间体LiP(II)和/或LiP(III)向LiP的转化, 使LiP的催化循环加速, VA生成的VA＋·也间接氧化了染料PR, 从而使PR的氧化速率提高.

关键词: 木素过氧化物酶, 邻苯三酚红, 氧化降解, 藜芦醇, 抑制作用

The oxidation reaction of pyrogallol red (PR) by H2O2 in the presence of lignin peroxidase (LiP) was studied at different concentrations of H2O2. Experiments showed that the oxidation products depended on the molar ratio of H2O2 to PR, suggesting that the LiP catalyzed oxidation products of PR should be controllable. This phenomenon was caused by the dual roles of H2O2, i.e., at lower concentrations it was an activator of LiP, while at higher concentrations it was an inhibitor. Veratryl alcohol (VA) could stimulate the oxidation of PR catalyzed by LiP, especially at higher molar ratios of H2O2 to PR, however, PR inhibited the LiP catalyzed oxidation of VA. The inhibition should be used to explain a phenomenon that no veratryl alcohol activity was detected in the culture of white rot fungi where dye was effectively decolorized. Kinetics analysis suggested that VA should accelerate the conversion of LiP(II) and/or LiP(III) to LiP, and therefore the catalytic cycle of LiP. Indirect oxidation of PR by the veratryl alcohol cationic radical was also contributed to the increase in the oxidation rate of PR.

Key words: lignin peroxidase, pyrogallol red, oxidative degradation, veratryl alcohol, inhibition