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Dissipation kinetics and risk assessment of pyraclostrobin after open field application in cucumber under Egyptian conditions

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Abstract

Pyraclostrobin is a strobilurin fungicide and widely used in Egypt for the protection of cucumber cultivation from several high-risk diseases. We have investigated (1) consumer safety after pyraclostrobin treatment in cucumbers and (2) its residue behavior. Supervised field trials were conducted to estimate the dynamics and terminal residues of pyraclostrobin in cucumbers grown under Egyptian climatic conditions and several agricultural practices, including worst case scenarios. For the determination of residues in fruits, a QuEChERS (quick, easy, cheap, effective, rugged, and safe)-based protocol coupled with liquid chromatography-tandem mass spectrometry (LC–MS/MS) was employed and successfully validated at a limit of quantification (LOQ) of 0.001 mg kg−1. The decline of pyraclostrobin residues in fruits fit a first-order decay process with a calculated t1/2 of 2.26 days and a significant degradation (99%) after 14 days. A consumer risk assessment was performed employing both FAO/WHO and EFSA approaches. No significant health risks after the consumption of treated cucumbers were identified.

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Data availability

The datasets used and/or analysed during the current study are available from Dr. Farag Malhat (farag_malhat@yahoo.com) on reasonable request.

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Authors and Affiliations

  1. Central Agricultural Pesticide Laboratory, Pesticide Residues and Environmental Pollution Department, Agricultural Research Center, Dokki, Giza, 12618, Egypt

    Farag Malhat, El-Sayed Saber & Shokr Abdelsalam Shokr

  2. Laboratory of Pesticides Residues, Scientific Directorate of Pesticides Control and Phytopharmacy, Benaki Phytopathological Institute, 8 St. Delta Street, Kifissia, 14561, Athens, Greece

    Chris Anagnostopoulos

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  1. Farag Malhat
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  2. Chris Anagnostopoulos
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  3. El-Sayed Saber
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  4. Shokr Abdelsalam Shokr
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Contributions

FM: Designed and coordinated the study, developed analytical method, analysed the samples, interpreted the results, edited, and wrote the manuscript. CA: wrote the manuscripts, conducted the bibliography search, performed statistical analysis, interpreted the results, and performed the risk assessment. ES and SAS: conducted the experiment design, the field trial, and the analysis of the samples. All authors read and approved the final manuscript.

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Correspondence to Farag Malhat or Chris Anagnostopoulos.

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Malhat, F., Anagnostopoulos, C., Saber, ES. et al. Dissipation kinetics and risk assessment of pyraclostrobin after open field application in cucumber under Egyptian conditions. J Consum Prot Food Saf 16, 333–341 (2021). https://doi.org/10.1007/s00003-021-01330-4

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  • DOI: https://doi.org/10.1007/s00003-021-01330-4

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