Abstract
The aim of this work was to study the pharmacokinetic behaviour and the inhibitory effect on acetylcholinesterase and butyrylcholinesterase activities of chlorpyrifos in male and female cattle after pour-on administration. Determination of cholinesterase activity in plasma and erythrocyte was carried out according to Ellman kinetic method. The mean baseline activities were 9338.39 ± 1331.61 and 13220.69 ± 2274.18 to acetylcholinesterase and 624.65 ± 39.32 and 641.68 ± 88.08 IU/L to butyrylcholinesterase in females and males, respectively. Acetylcholinesterase was the predominant form of cholinesterase analyzed, with low levels of butyrylcholinesterase. The basal acetylcholinesterase activities of the bulls were significantly greater than those of cows. The inhibitory effect of topical chlorpyrifos administration was lower on butyrylcholinesterase than on acetylcholinesterase. Chlorpyrifos peak plasma concentration (male:10.920 ± 4.18; female:12.12 ± 3.88 μg/L) were reached at 11.92 ± 9.19 and 8.17 ± 7.67 h in male and female, respectively. The values of area under curve were 185.96 ± 168.45 and 278.89 ± 270.00 μg·h/L and mean residence time were 13.95 ± 8.10 and 14.90 ± 9.80 h in male and female, respectively.
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Abbreviations
- AChE:
-
acetylcholinesterase
- AUC:
-
area of the plasma concentration-time curve
- AUMC:
-
area under the first moment curve
- BChE:
-
butyrylcholinesterase
- Cmax:
-
peak plasma concentration
- MRT:
-
mean residence time
- tmax:
-
time of Cmax
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Acknowledgements
The authors wish to thank Mr. Roman Folli, Mr. Ariel Antonelli and Mr. Martín Re for his technical assistance, Mr. Santiago Cano for his advices and the staff of the Servicio de Préstamo Interbibliotecario Facultad de Veterinaria for helping.
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Picco, E.J., Rubio, M.R., Díaz David, D.C. et al. Pharmacokinetics and pharmacodynamics of chlorpyrifos in male and female cattle after topical administration. Vet Res Commun 32, 401–410 (2008). https://doi.org/10.1007/s11259-008-9035-0
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DOI: https://doi.org/10.1007/s11259-008-9035-0