Abstract
Human biomonitoring provides information about chemicals measured in biological matrices, but their interpretation remains uncertain because of pharmacokinetic (PK) interactions. This study examined the PKs in blood from Long–Evans rats after a single oral dose of 0.4 mg/kg bw of each pesticide via a mixture of the 17 pesticides most frequently measured in humans. These pesticides are β-endosulfan; β-hexachlorocyclohexane [β-HCH]; γ-hexachlorocyclohexane [γ-HCH]; carbofuran; chlorpyrifos; cyhalothrin; cypermethrin; diazinon; dieldrin; diflufenican; fipronil; oxadiazon; pentachlorophenol [PCP]; permethrin; 1,1-dichloro-2,2bis(4-chlorophenyl)ethylene [p,p′-DDE]; 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane [p,p′-DDT]; and trifluralin. We collected blood at 10 min to 48-h timepoints in addition to one sample before gavage (for a control). We used GS–MS/MS to measure the pesticide (parents and major metabolites) concentrations in plasma, determined the PK parameters from 20 sampling timepoints, and analyzed the food, litter, and cardboard in the rats’ environment for pesticides. We detected many parents and metabolites pesticides in plasma control (e.g., diethyl phosphate [DEP]; PCP; 3-phenoxybenzoic acid [3-PBA]; 3,5,6-trichloro-2-pyridinol [TCPy], suggesting pre-exposure contamination. The PK values post-exposure showed that the AUC0−∞ and Cmax were highest for TCPy and PCP; β-endosulfan, permethrin, and trifluralin presented the lowest values. Terminal T1/2 and MRT for γ-HCH and β-HCH ranged from 74.5 h to 117.1 h; carbofuran phenol presented the shortest values with 4.3 h and 4.8 h. These results present the first PK values obtained through a realistic pattern applied to a mixture of 17 pesticides to assess exposure. This study also highlights the issues of background exposure and the need to work with a relevant mixture found in human matrices.
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Abbreviations
- 3-PBA:
-
3-Phenoxybenzoic acid
- ADME:
-
Absorption, distribution, metabolism, and excretion
- ATSDR:
-
Agency for Toxic Substances and Disease Registry
- AUC0−∞ :
-
Area under the curve
- C max :
-
Maximum concentration in plasma
- Cl2CA:
-
Cis-/trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylic acid
- ClCF3CA:
-
3-(2-Chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylic acid
- DEP:
-
Diethyl phosphate
- DETP:
-
Diethyl thiophosphate
- ED30 :
-
Effective dose
- EDTA:
-
Ethylenediaminetetraacetic acid
- EFSA:
-
European Food Safety Authority
- FNR:
-
Luxembourg National Research Fund (Fonds National de la Recherche)
- GC:
-
Gas chromatography
- GC–MS/MS:
-
Gas chromatography with tandem mass spectrometry
- HCH:
-
Hexachlorocyclohexane (gamma [γ], beta [β])
- LD50:
-
Lethal dose 50%
- MRT:
-
Mean residence time
- PAH:
-
Polycyclic aromatic hydrocarbon
- PCP:
-
Pentachlorophenol
- PK:
-
Pharmacokinetics
- p,p′-DDD:
-
1,1-Dichloro-2,2-bis(p-chlorophenyl)ethane
- p,p′-DDE:
-
1,1-Dichloro-2,2bis(4-chlorophenyl) ethylene
- p,p′-DDT:
-
1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane
- SPME:
-
Solid-phase microextraction
- T 1/2 :
-
Terminal elimination half-life
- TCPy:
-
3,5,6-Trichloro-2-pyridinol
- T max :
-
Time to reach the Cmax
- WHO:
-
World Health Organization
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Acknowledgements
Caroline Chata benefited from a Ph.D. grant from the Luxembourg National Research Fund (Fonds National de la Recherche [FNR]) (AFR 7009593), Luxembourg.
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Chata, C., Palazzi, P., Grova, N. et al. Blood pharmacokinetic of 17 common pesticides in mixture following a single oral exposure in rats: implications for human biomonitoring and exposure assessment. Arch Toxicol 93, 2849–2862 (2019). https://doi.org/10.1007/s00204-019-02546-y
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DOI: https://doi.org/10.1007/s00204-019-02546-y