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Efficient degradation and decolorization of triphenylmethane dyes by Serratia sp. WKD under extreme environmental conditions and the mechanism

文献类型： 外文期刊

作者： Du, Linna 1 ; Wu, Huan 1 ; Li, Gang 1 ; Wei, Yi 1 ; Wang, Fei 3 ; Xu, Ligen 4 ; Dong, Xinjiao 2 ;

作者机构： 1.Jiaxing Nanhu Univ, Coll Adv Mat Engn, Jiaxing 314001, Peoples R China

2.Wenzhou Univ, Coll Life & Environm Sci, Wenzhou 325027, Peoples R China

3.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Proc Minist Agr & Rural Affairs, Zhanjiang 524001, Peoples R China

4.Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310058, Peoples R China

关键词： Serratia sp; MG; CV; Extreme environments; Characteristics; Mechanism

期刊名称：INTERNATIONAL BIODETERIORATION & BIODEGRADATION （ 影响因子：4.8； 五年影响因子：5.0 ）

ISSN： 0964-8305

年卷期： 2023 年 179 卷

页码：

收录情况： SCI

摘要： Microbial degradation of dyes is fundamental and essential for understanding their environmental fate. In this study, a new bacterial strain with efficient degrading capability of triphenylmethane (TPM) dyes named WKD was isolated and identified as the genus Serratia sp. by 16S rDNA analysis. The decolorization of TPM dyes by the strain especially under extreme environmental conditions were studied. The results showed that the strain could completely decolorize Malachite Green (MG) and Crystal Violet (CV) at pH values ranging from 3.0 to 10.0 and at temperatures ranging from 20 degrees C to 45 degrees C in a 12 h of incubation. The strain still showed an excellent decol-orizing capability even at low (5 degrees C) and high (60 degrees C) temperatures. Moreover, the enzymatic analysis indicated that MnP, NADH-DCIP reductase, MG reductase, and CV reductase might be involved in TPM dyes biodegra-dation. Besides, the biodegradation pathways were proposed based on UV-visible, FTIR, and LC-Q-TOF-MS analyses. Results indicated that degradation of MG by the strain was mainly regulated by N-demethylation and hydroxylation pathways, while degradation of CV was only by the N-demethylation pathway. Therefore, Serratia sp. strain WKD is expected to have a broad application prospect for the bioremediation of TPM dyes, especially in extreme environments.

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