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Biodegradation of naproxen by freshwater algae Cymbella sp and Scenedesmus quadricauda and the comparative toxicity

文献类型： 外文期刊

作者： Ding, Tengda 2 ; Lin, Kunde 2 ; Yang, Bo 1 ; Yang, Mengting 1 ; Li, Juying 1 ; Li, Wenying 3 ; Gan, Jay 4 ;

作者机构： 1.Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518060, Peoples R China

2.Xiamen Univ, Coll Environm & Ecol, State Key Lab Marine Environm Sci, Key Lab Minist Educ Coastal & Wetland Ecosyst, Xiamen 361005, Peoples R China

3.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Guangdong, Peoples R China

4.Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA

5.Shenzhen Univ, Shenzhen Key Lab Environm Chem & Ecol Remediat, Shenzhen 518060, Peoples R China

关键词： Naproxen;Biodegradation;Degradation pathway;Algae;Toxicity

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Naproxen is one of the most prevalent pharmaceuticals and of great environment concern. Information about bioremediation of naproxen by algae remains limited and no study has been reported on the degradation mechanism and the toxicity of NPX on algae. In this study, both Cymbella sp. and Scenedesmus quadricauda showed complete growth inhibition (100%) at 100 mg L-1 within 24 h. Biochemical characteristics including chlorophyll a, carotenoid contents and enzyme activities for these two microalgae were affected by NPX at relatively high concentrations after 4 d of exposure. Degradation of naproxen was accelerated by both algae species. Cymbella sp. showed a more satisfactive effect in the bioremediation of NPX with higher removal efficiency. A total of 12 metabolites were identified by LC-MS/MS and the degradation pathways of naproxen in two algae were proposed. Hydroxylation, decarboxylation, demethylation, tyrosine conjunction and glucuronidation contributed to naproxen transformation in algal cells. (C) 2017 Elsevier Ltd. All rights reserved.

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