Abstract
Objectives
This study investigated the toxicological aspects of chlorpyrifos and diuron concentrations below maximum residue limit (MRL) in rabbits, determined their residues associated with the toxicological aspects and modeled the toxicity.
Methods
Single- and repeated-dose toxicity tests were employed using white rabbits as experimental animals. In both toxicity tests, rabbit responses were evaluated by monitoring their body weight, various growth factors, activity of acetylcholinesterase (AChE), and activities of liver enzymes, alkaline phosphatase (ALP), aspartate aminotransferase (AST) and alanine aminotransferase (ALT). Various kidney functions (urea, uric acid, creatinine and total protein concentration) were evaluated. Pesticide residues were also determined by GC.
Results
Repeated-dose toxicity test of chlorpyrifos and diuron significantly reduced the body, liver and heart weights compared with those of the control group (p = 0.045). Both tests reduced the serum AChE, AST and ALT activities and increased ALP activity. On the other hand, the tested compounds increased the uric acid and urea concentrations and reduced the creatinine concentration in the blood serum. Chlorpyrifos was detected in blood, kidney and manure samples whereas diuron was detected in liver tissues and blood samples.
Conclusions
Concentrations of chlorpyrifos and diuron far below MRL values generated various toxic effects in rabbits, indicating a possible health risk.
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Abbreviations
- LD50:
-
Lethal dose required to kill 50% of tested organisms
- MRL:
-
Maximum residue limit
- ALP:
-
Alkaline phosphatase
- AST:
-
Aspartate aminotransferase
- ALT:
-
Alanine aminotransferase
- AChE:
-
Acetylcholinesterase
- EDTA:
-
Ethylenediaminetetraacetic acid
- IUPAC:
-
International Union of Pure and Applied Chemistry
- OECD:
-
Organization for Economic Co-operation and Development
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Acknowledgements
The authors would like to give special thanks to the Alexander von Humboldt Foundation for providing a Research Fellowship to Leipzig University and the BAM Institute Germany.
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Yasser El-Nahhal, Raaed Lubbad and Mohammad R. Al-Agha declare that we have no conflict of interest.
Ethical approval
Ethical approval for this study was obtained from the research committee of the Faculty of Science and the Faculty of Medicine at The Islamic University Gaza.
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El-Nahhal, Y., Lubbad, R. & Al-Agha, M.R. Toxicity evaluation of chlorpyrifos and diuron below maximum residue limits in rabbits. Toxicol. Environ. Health Sci. 12, 177–190 (2020). https://doi.org/10.1007/s13530-020-00015-z
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DOI: https://doi.org/10.1007/s13530-020-00015-z