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The in vivo and vitro degradation of sulfonamides in wetland plants reducing phytotoxicity and environmental pollution

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Abstract

Aquatic plants can be used for in situ remediation of water-borne pharmaceutical compounds; however, such information and that of the potential risks of metabolites released into the environment are limited. This study determined the capacity of Canna indica and Acorus calamus used in the remediation of water-borne sulfonamides (SA). The tolerance, removal, accumulation, and biotransformation of various water-borne SAs were investigated in vivo by exposing plants to SA solutions (50 µg/L and 500 µg/L). After 28 days, C. indica removed more SAs (89.3–97.8%) than A. calamus (12.8–84.6%) and non-planted systems (8.0–69.3%). The SA removal results, except from the A. calamus system with 500 µg/L SA, fit the first-order kinetics model. The estimated half-lives of all SAs were 3–40 h and 2–60 h in the C. indica and A. calamus systems, respectively. In vivo biotransformation and rhizosphere degradation were the major phyto-removal mechanisms, constituting 24.9–81.1% and 0.0–37.1% of all SAs in the C. indica and A. calamus systems, respectively. SA acetyl metabolites were detected only in plant tissues supporting evidence for plant metabolic processes without risk into the environment. SA metabolism including oxidation, methylation, and conjugation via acetylation was potentially beneficial to accumulation and tolerate stress of antibiotic. Canna indica was more suitable for cleaning SA. Our findings better clarify the potential and low risks of phytoremediation in antibiotic-contaminated waters.

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Acknowledgements

We are grateful to the advice from Prof. Nora Fung-Yee Tam from City University of Hong Kong, China, and Jan Vymazal from Czech University of Life Sciences, Prague, on writing.

Funding

The study was financed by the Science and Technology Project of Guangdong Province, China (2018B030324003); the Key-Area Research and Development Program of Guangdong Province, China (2019B110205002); and the Special Fund for Science and Technology Innovation Strategy of Guangdong Province, China (2019A050505005).

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Weifeng Ruan: investigation, writing – original draft. Jiaxi Wang: investigation, methodology, data curation. Jie Huang: resources. Yiping Tai: writing – review and editing, project administration. Rui Wang: funding acquisition. Weipeng Zhu: resources. Yang Yang: supervision, conceptualization.

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Correspondence to Yiping Tai.

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Weifeng Ruan and Jiaxi Wang contributed to the work equally and should be regarded as co-first authors

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Ruan, W., Wang, J., Huang, J. et al. The in vivo and vitro degradation of sulfonamides in wetland plants reducing phytotoxicity and environmental pollution. Environ Sci Pollut Res 29, 64972–64982 (2022). https://doi.org/10.1007/s11356-022-20395-8

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