Publications by authors named "Won-Jo Choe"
The aim of this study is to develop a rapid and accurate method for simultaneous analysis of multi-residue pesticides and conduct pesticide monitoring in agricultural products produced by the production and distribution stage in Korea. The representative agricultural products were selected as brown rice, soybean, potato, mandarin, and green pepper and developed using gas chromatography with tandem mass (GC-MS/MS) for the analysis of 272 pesticide residues. The experimental samples were extracted by the QuEChERS-EN method and then cleaned up by using d-SPE, including MgSO and primary secondary amine (PSA) sorbents.
View Article and Find Full Text PDFArticle Synopsis
- Chlorothalonil is a widely used organochlorine fungicide that prevents fungal diseases in crops but can leave residues in agricultural products.
- A new analytical method using a modified QuEChERS technique combined with gas chromatography-mass spectrometry (GC-MS/MS) was developed to effectively detect chlorothalonil residues in various foods in South Korea.
- The method demonstrated high accuracy with excellent linearity and satisfactory detection limits, confirming chlorothalonil residues in multiple commodities including apples, watermelon, and cucumber, which can aid in food safety monitoring.
The development of efficient methods for evaluating pesticide residues is essential in order to ensure the safety and quality of agricultural products since the Republic of Korea implemented the Positive List System (PLS). The objective of this research was to establish a method for the simultaneous analysis of 322 pesticide residues in fruits and vegetables (such as coffee, potato, corn, and chili pepper), using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) approach in combination with gas chromatography-tandem mass spectrometry (GC-MS/MS). This study introduces a robust, high-throughput GC-MS/MS method for screening the target pesticide residues in agricultural products, achieving the PLS criterion of 0.
View Article and Find Full Text PDFDetermination of 66 pesticide residues in livestock products using QuEChERS and GC-MS/MS.
Food Sci Biotechnol
November 2020
Article Synopsis
- Researchers analyzed 66 pesticide residues in livestock products like beef, pork, chicken, eggs, and milk using a GC-MS/MS method combined with the QuEChERS extraction technique.
- The study achieved high accuracy with linearity from 2.5 to 1000 µg/L, and limits of quantification for various pesticides ranged from 0.74 to 23.1 µg/kg, showing a recovery rate between 70% and 120%.
- Chlorpyrifos and fenitrothion were found in beef and pork but below safety limits, while no residues were detected in other samples, suggesting this method is effective for regular monitoring of pesticide levels in livestock.