Photo-biodegradation of imidacloprid under blue light-emitting diodes with bacteria and co-metabolic regulation

Punniyakotti Elumalai; Xiaohui Yi; Tingting Cai; Wei Xiang; Chaoguang Huang; Mingzhi Huang; Guang-Guo Ying

doi:10.1016/j.envres.2021.111541

Photo-biodegradation of imidacloprid under blue light-emitting diodes with bacteria and co-metabolic regulation

Environ Res. 2021 Oct:201:111541. doi: 10.1016/j.envres.2021.111541. Epub 2021 Jun 18.

Authors

Punniyakotti Elumalai¹, Xiaohui Yi², Tingting Cai¹, Wei Xiang³, Chaoguang Huang⁴, Mingzhi Huang⁵, Guang-Guo Ying¹

Affiliations

¹ SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China.
² SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China; Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China; Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academyof Sciences, Guangzhou, 510640, PR China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, PR China.
³ Chongqing Holly Environment Impact Assessment Co., Ltd, Chongqing, 400023, PR China.
⁴ Changshao Public Engineering Construction Center, 410013, PR China.
⁵ SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, PR China. Electronic address: mingzhi.huang@m.scnu.edu.cn.

PMID: 34147468
DOI: 10.1016/j.envres.2021.111541

Abstract

Imidacloprid (IMI) is existence in the soil environment with a half-life habitually more than hundred days. This study targets to determine, identify and characterize photo-biodegradation bacteria from neonicotinoids (NEOs) contaminated agricultural field soils. The sub-surface soil had a higher level contamination of NEOs, in specifically greater concentration of IMI (3445.2 ± 0.09 μg/g) and thiacloprid (4084.4 ± 0.09 μg/g) has been found. Three bacteria Ralstonia pickettii (PBMS-2), Bacillus cereus (PBMS-3) and Shinella zoogloeoides (PBMS-4) was identified from soil-free stable enrichment cultures. The biodegradability of IMI (50 mg L^-1) by three bacteria under different colors of light-emitting diodes (LEDs) with a constant 12 V power supply was tested and found that the blue-LEDs had greatest efficiency in supporting biodegradation of IMI which is called photo-biodegradation. In specific, the rate of photo-biodegradation of IMI by Ralstonia pickettii (87%), Bacillus cereus (80%) and Shinella zoogloeoides (80%) was measured. Besides this study also tested the effect of aeration (rpm), pH, and temperature on photo-biodegradation of IMI. There were seven intermediate metabolites were measured as biodegradation products of IMI under photo-biodegradation conditions and they are; IMI-urea, IMI-desnitro, 6-chloronicotinic acid, 6-hydroxy nicotinic acid, IMI- aminoguanidine, IMI-nitrosoguanidine and 4,5-hydroxy IMI, these metabolites are may non-toxic to the environment.

Keywords: Biodegradation; Blue-LEDs; Imidacloprid; Photo-biodegradation; Photodegradation.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Insecticides*
Neonicotinoids
Nitro Compounds
Rhizobiaceae*

Substances

Insecticides
Neonicotinoids
Nitro Compounds
imidacloprid

Supplementary concepts

Shinella zoogloeoides