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Infl uence of counteranions on catalytic ability of immobilized laccase in Cu-alginate matrices：Inhibition of chloride and activation of acetate

Ting Pan ,  Yao-Jin Sun ,  Xiao-Lei Wang ,  Ting Shi ,  Yi-Lei Zhao

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Citation:  Ting Pan, Yao-Jin Sun, Xiao-Lei Wang, Ting Shi, Yi-Lei Zhao. Infl uence of counteranions on catalytic ability of immobilized laccase in Cu-alginate matrices：Inhibition of chloride and activation of acetate[J]. Chinese Chemical Letters, 2014, 25(7): 983-988. doi: 10.1016/j.cclet.2014.05.045 shu

Infl uence of counteranions on catalytic ability of immobilized laccase in Cu-alginate matrices：Inhibition of chloride and activation of acetate

    • 通讯作者: Yi-Lei Zhao,
  • 基金项目:

    The first author gave special thanks to Mr. Yanbing Qi, Mr. Lanxuan Liu for discussions. This work is supported in part by the National High-Tech R&D Program of China "863" (No. 2012AA020403)  (No. 2012AA020403)

    the National Basic Research Program of China "973" (Nos. 2012CB721005, 2013CB966802) (Nos. 2012CB721005, 2013CB966802)

    National Natural Science Foundation of China (Nos. 21377085, 21303101, 31121064, J1210047) (Nos. 21377085, 21303101, 31121064, J1210047)

    MOE New Century Excellent Talents in University (No. NCET-12-0354). (No. NCET-12-0354)

摘要: Laccase is a promising oxidase with environmental applications, such as lignin degradation and chlorophenol detoxification. Laccase immobilization can significantly improve physiochemical stability and reusability compared to the free enzymes. In this work, anion effect was investigated in entrapment of Cu-alginate matrix with five types of anions, including perchlorate (ClO4-), nitrate (NO3-), sulfate (SO42- ), chloride (Cl-), and acetate (CH3CO2-). Accordingly, chloride inhibition and acetate activation were detected in the o-tolidine kinetic experiments, while effects of the other three anions were much smaller. Such counteranion effects were also observed in the laccase-catalyzed biodegradation of 2,4-dichlorophenol. The results indicated that counteranions in the enzyme immobilization process are crucial for catalytic capacity, probably due to the competition with the carboxylate groups in alginate. Our results also imply that these anions might coordinate the copper cations in laccase.

English

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  • 收稿日期:  2014-03-19
  • 网络出版日期:  2014-05-13
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