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Degradation of dyes using crude extract and a thermostable and pH-stable laccase isolated from Pleurotus nebrodensis

文献类型： 外文期刊

作者： Yuan, Xianghe 1 ; Tian, Guoting 3 ; Zhao, Yongchang 3 ; Zhao, Liyan 4 ; Wang, Hexiang 1 ; Ng, Tzi Bun 5 ;

作者机构： 1.China Agr Univ, State Key Lab Agrobiotechnol, Beijing 100193, Peoples R China

2.China Agr Univ, Dept Microbiol, Beijing 100193, Peoples R China

3.Yunnan Acad Agr Sci, Inst Biotechnol & Germplasm Resource, Kunming 650223, Peoples R China

4.Nanjing Agr Univ, Coll Food Sci & Technol, Nanjing 210095, Jiangsu, Peoples R China

5.Chinese Univ Hong Kong, Sch Biomed Sci, Fac Med, Shatin, Hong Kong, Peoples R China

关键词： crude extract;decolourization;detoxification;laccase isoenzymes;malachite green;Pleurotus nebrodensis

期刊名称：BIOSCIENCE REPORTS （ 影响因子：3.84； 五年影响因子：4.059 ）

ISSN： 0144-8463

年卷期： 2016 年 36 卷

页码：

收录情况： SCI

摘要： Three laccase isoenzymes (Lac1, Lac2 and Lac3) have been purified to homogeneity from Pleurotus nebrodensis in our previous study. Lac2 was shown to be the dominant isoform, capable of oxidizing the majority of laccase substrates and manifesting good thermostability and pH stability. Hence, Lac2 was selected to decolourize structurally different dyes and the colour removal efficiencies of Lac2 and the crude extract of P. nebrodensis were compared. By monitoring the.max of the reaction system during the course of biotransformation, clear hypsochromic shifts were observed for most of the dyes examined, illustrating that at least one peak disappeared as a result of laccase treatment. In general, Lac2 was more efficient within a short time (1 h) and the crude extract, in general, could achieve similar or even higher efficiency when the duration of treatment was extended to 24 h. Malachite green (MG) was chosen to study the detoxifying potential of Lac2, because of the relatively simple structure and high toxicity of the dye towards microorganisms. The toxicity of MG towards both bacteria (Bacillus subtilis, Bacillus licheniformis, Pseudomonas fluorescens and Escherichia coli) and fungi (Fusarium graminearum and Trichoderma harzianum) was dramatically decreased and the potential mechanism was estimated by GC-MS as to remove four methyl groups firstly and the two newly formed amine groups would be degraded or polymerized further. The present study facilitates an understanding of the application of P. nebrodensis laccases and furnishes evidence for the safety of their utilization in the treatment of wastewater emanating from textile industries.

  • 相关文献

[1]Biochemical Characteristics of Three Laccase Isoforms from the Basidiomycete Pleurotus nebrodensis. Yuan, Xianghe,Wang, Hexiang,Yuan, Xianghe,Wang, Hexiang,Tian, Guoting,Zhao, Yongchang,Zhao, Liyan,Ng, Tzi Bun.

[2]Purification and characterization of a novel laccase from the mushroom pleurotus nebrodensis. Wang, He-Xiang,Wang, He-Xiang,Ng, Tzi Bun,Zhang, Guo-Qing,Tian, Guo-Ting.

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