Biodegradation of naproxen by freshwater algae Cymbella sp and Scenedesmus quadricauda and the comparative toxicity
文献类型: 外文期刊
第一作者: Yang, Bo
作者: Yang, Bo;Yang, Mengting;Li, Juying;Ding, Tengda;Lin, Kunde;Li, Wenying;Gan, Jay;Yang, Bo;Li, Juying
作者机构:
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.
分类号: Q
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