Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD
Rabie, M., Ibrahim, E., Elhafny, D., Bayoumi, M. (2018). Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD. EKB Journal Management System, 61(2), 249-257. doi: 10.21608/ejchem.2018.2803.1227
Mansour Rabie; El-Desouki Sabri Ibrahim; Dalia Elhafny; Mohammed Bayoumi. "Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD". EKB Journal Management System, 61, 2, 2018, 249-257. doi: 10.21608/ejchem.2018.2803.1227
Rabie, M., Ibrahim, E., Elhafny, D., Bayoumi, M. (2018). 'Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD', EKB Journal Management System, 61(2), pp. 249-257. doi: 10.21608/ejchem.2018.2803.1227
Rabie, M., Ibrahim, E., Elhafny, D., Bayoumi, M. Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD. EKB Journal Management System, 2018; 61(2): 249-257. doi: 10.21608/ejchem.2018.2803.1227

Determination of Dinotefuran and Thiamethoxam Residues in Pepper Fruits under Greenhouse Conditions using the QuEChERS Method and HPLC/DAD

Egyptian Journal of Chemistry
Article 3, Volume 61, Issue 2, March and April 2018, Page 249-257  XML PDF (1.58 MB)
Document Type: Original Article
DOI: 10.21608/ejchem.2018.2803.1227
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Authors
Mansour Rabie1; El-Desouki Sabri Ibrahim1; Dalia Elhafnyorcid 2; Mohammed Bayoumi email orcid 3
1Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Egypt
2Pesticides Residues and Environmental Pollution, Central Agricultural Pesticides Laboratory, Agricultural Research Center, Giza, Egypt
3Lecture Assistant Economic Entomology and Pesticides (Pesticides Branch) Faculty of Agriculture, Cairo University
Abstract
Determination of dinotefuran and thiamethoxam residues levels in pepper samples which were collected randomly at 0, 1, 3, 5, 7, 10, 15 and 21 days after treatment using quick, easy, cheap, effective, rugged, safe (QuEChERS) method and cleanup step utilizing solid-phase extraction (SPE) followed by determined by high-performance liquid chromatography with diode-array detection (HPLC/DAD). Dinotefuran and thiamethoxam were recovered within 77-80% and 78-112%, respectively at the spike levels (0.01 - 1 mg/kg) in pepper samples with relative standard deviations (RSDs) lower than 3%. Good linearity was achieved for dinotefuran and thiamethoxam with an excellent correlation coefficient of R2 > 0.996 and the matrix matched calibration also showed good linearity with determination coefficients R2 > 0.98. The initial deposits of dinotefuran and thiamethoxam in pepper fruits were 6.59 and 1.38 mg/kg, respectively. The half-life period (RL50) of tested pesticides on pepper fruits were 2 and 3.11 days for dinotefuran and thiamethoxam, respectively. According to maximum residue level (MRL) (0.01 mg/kg for dinotefuran and 0.7 mg/kg for thiamethoxam) the pre-harvest interval (PHI) was 11 and 4 days, respectively.
Keywords
Dissipation; Determination QuEChERS; Dinotefuran; thiamethoxam; HPLC-DAD and Pepper
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