A matrix sensitive gas chromatography method for the analysis of pymetrozine in red pepper: Application to dissipation pattern and PHRL

•For the first time, pymetrozine was determined in red pepper using GC-NPD.•Samples were extracted using modified QuEChERS acetate-buffered version.•The method proved to be simple and sensitive, with a good performance.•The dissipation pattern followed the first order kinetics model with short half-...

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Bibliographic Details
Published in:Food chemistry 2014-03, Vol.146, p.448-454
Main Authors: Jang, Jin, Rahman, Md. Musfiqur, Ko, Ah-Young, Abd El-Aty, A.M., Park, Jong-Hyouk, Cho, Soon-Kil, Shim, Jae-Han
Format: Article
Language:English
Subjects:
Biological and medical sciences
Capsicum - chemistry
Chromatography, Gas - methods
Detectors
Dissipation
Food toxicology
Foods
Gas chromatography
Half life
Limit of Detection
Mass confirmation
Matrix effect
Medical sciences
Pesticide Residues - analysis
Pesticide Residues - standards
Pre-harvest residue limit
Pymetrozine
Red peppers
Republic of Korea
Residues
Standard deviation
Toxicology
Triazines - analysis
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Summary:•For the first time, pymetrozine was determined in red pepper using GC-NPD.•Samples were extracted using modified QuEChERS acetate-buffered version.•The method proved to be simple and sensitive, with a good performance.•The dissipation pattern followed the first order kinetics model with short half-life. A gas chromatography (GC) method for the analysis of pymetrozine was developed after utilizing matrix enhancement effect of pymetrozine to nitrogen phosphorus detector (NPD). Samples were extracted with acetonitrile and purified through primary secondary amine (PSA) and C18 dispersive sorbent. Matrix-matched calibration curve prepared after spiking standard pymetrozine across the studied range of concentrations (0.003–1.0mg/L) into blank red pepper extract was excellent with a determination coefficients (R2)=1. Recovery studies were carried out at three concentration levels (0.04, 0.4, and 2.0mg/kg, n=3) and the rates were ranged between 77.2% and 109.1%, with relative standard deviations ranged from 1.3% to 16.4%. The developed method was applied to field samples to characterize the dissipation pattern, half life, and pre-harvest residue limits (PHRL). The dissipation rates of the analyte were ascribed to first-order kinetics with half-life of 2.7 and 2.5days for recommended and double the recommended doses. From the PHRL curve, we could predict that if the residue level of pymetrozine is below the 1.23mg/kg at 10days or 0.71mg/kg at 7days before harvest, then the residues will be below the maximum residue limits (MRL=0.2mg/kg) established by the Korea Food and Drug Administration (KFDA).
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2013.09.052