Residual pattern of fenhexamid on pepper fruits grown under greenhouse conditions using HPLC and confirmation via tandem mass spectrometry |
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| Authors: | Lina Hem Jeong-Heui Choi Jong-Hyouk Park MdIR Mamun Soon-Kil Cho AM Abd El-Aty Jae-Han Shim |
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| Affiliation: | 1. Natural Products Chemistry Laboratory, College of Agriculture and Life Science, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea;2. Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh;3. National Agricultural Products Quality Management Service, Products Safety Inspection Laboratory, Gwangsan-gu, Gwangju, Republic of Korea;4. Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, 12211 Giza, Egypt |
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| Abstract: | Fenhexamid (25%, SC) was sprayed on pepper fruits grown under greenhouse conditions at the recommended dose rate of 20 g/20 L water. Fruit samples were collected randomly at 0 (2 h after application), 1, 2, 4, 6, 8, 11, and 14 days post-application. The samples were extracted with acetonitrile, partitioned with water, passed through a cleanup procedure, and analysed via HPLC. Residues were confirmed via LC–tandem mass spectrometry (LC–MS/MS) in positive-ion electrospray ionisation (ESI+) mode. The rate of disappearance of fenhexamid on pepper fruits was described as first-order kinetics (r2 = 0.992) with a half-life of 4.7-day. Based on the pattern of decline of the fungicide residues in relation to the estimated maximum residue limits (MRL = 5 mg/kg), a safety pre-harvest interval of 1 day is suggested for peppers at the recommended dosage. |
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| Keywords: | Residue analysis Fenhexamid Pepper fruits Pre-harvest interval Disappearance pattern |
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