Enantioselective separation and zebrafish embryo toxicity of insecticide
beta-cypermethrin |
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Authors: | Chao Xu Wenqing Tu Chun Lou Yingying Hong and Meirong Zhao |
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Institution: | Research Center of Environmental Science, College of Biological and Environmental Engineering, Zhejiang University of Technology,Hangzhou 310032, China |
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Abstract: | Enantioselectivity of chiral pollutants is receiving growing concern due to the di erence in toxicology and environment fate between
enantiomers. In this study, enantiomers of insecticide beta-cypermethrin (beta-CP) were separated on selected chiral column by HPLC,
and the toxicity of enantiomers was evaluated using the zebrafish embryo-larval assays. The enantiomers of beta-CP were baseline
separated on Chiralcel OD and Chiralpak AD columns and detected by circular dichroism (CD) at 236 nm. Better separation could be
achieved at lower temperature (e.g., 20°C) and with lower levels of polar modifiers. Pure enantiomers were obtained on Chiralcel OD.
The CD spectra of enantiomers were recorded. By comparing the elution order with a previous similar study, the absolute configuration
of beta-CP enantiomers was determined. The individual enantiomers were used in zebrafish embryo test, and the results showed that
beta-CP enantioselectively induced yolk sac edema, pericardial edema and crooked body. The 1R-cis- S and 1R-trans- S enantiomers
showed strong developmental toxicities at concentration of 0.1 mg/L, while the 1S-cis- R and 1S-trans- R induced no malformations at
higher concentration (e.g., 0.3 mg/L). The results suggest that the enantioselective toxicological e ects of beta-CP should be considered
when evaluating its ecotoxicological e ects. |
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Keywords: | beta-cypermethrin enantioselectivity zebrafish embryo chiral separation |
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