期刊
BIORESOURCE TECHNOLOGY
卷 238, 期 -, 页码 164-173出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.04.018
关键词
Naproxen; Biodegradation; Degradation pathway; Algae; Toxicity
资金
- National Natural Science Foundation of China [21407108, 21607106]
- Shenzhen Science and Technology Project [KQJSCX20160226200315, ZDSYS201606061530079]
- Science and Technology Planning Project of Guangdong Province, China [2014A020216020, 2012B031000028]
- Natural Science Foundation of SZU [827-000077, 201444]
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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