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- W4387571309 abstract "Abstract Regular monitoring of pesticide residues in potatoes ( Solanum tuberosum L.) is important to ensure low risk of pesticide toxicity to consumers. An efficient, modified QuEChERS‐ d‐SPE was optimized and validated for quantification of pesticides residues (metalaxyl, chlorpyrifos, λ‐cyhalothrin, and cypermethrin) in popular Kenyan potato varieties ‘Shangi’, ‘Tigoni’ and ‘Dutch Robyjn’ grown under controlled field conditions using GC‐MS/MS. An evaluation of the effect of five spraying frequencies (Unsprayed, 5, 7, 10 and 14 days’ intervals) of metalaxyl‐based fungicides on residue levels in harvested potatoes was simultaneously done. Metalaxyl residue levels in the varieties were determined for each spraying regime. Method validation showed good linearity (r 2 ) of 0.988‐0.999, detection limit (0.37 to 0.61 μg/L), quantification limit (1.20 to 1.84 μg/L) while recovery (71‐ 94%) and precision (% RSD of 2.3‐24.1%) were used to determine the accuracy of the method. Pyrethroids (cypermethrin and λ‐cyhalothrin) and organophosphates (metalaxyl and chlorpyrifos) were detected in the potato samples. Residue levels of the compounds were not significantly different (p = 0.05) between varieties except for chlorpyrifos. Cypermethrin was the residue compound detected at the highest mean level with 17.4 μg/L, followed by metalaxyl, chlorpyrifos and λ‐cyhalothrin, at 2.88, 1.05 and 0.15 μg/L respectively. Residue levels at different spraying frequencies varied statistically between varieties (p = 0.05). Dutch Robyjn sprayed at 7 days’ interval had the highest residue level of 9.49±0.26 μg/L. QuEChERS‐dSPE with GC‐MS/MS has shown suitability for routine pesticide residue monitoring in potatoes. The potatoes grown under the controlled experimental conditions did not present any concern for human health, as the pesticide residues detected were below Codex MRLs of 500 μg/L. This article is protected by copyright. All rights reserved" @default.
- W4387571309 created "2023-10-13" @default.
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- W4387571309 date "2023-10-12" @default.
- W4387571309 modified "2023-10-13" @default.
- W4387571309 title "Analysis of pesticide residues in potato varieties using modified quechers multi‐residue method combined with gas chromatography tandem mass spectrometric detection" @default.
- W4387571309 doi "https://doi.org/10.1002/csc2.21121" @default.
- W4387571309 hasPublicationYear "2023" @default.
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