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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Determination of Residual Pesticides by Dispersive Liquid-Liquid Microextraction and HPLC from Green Tea

2018년 2월 6일 17시 27분 51초
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금 09시 : 19분
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
저자 및
Jongsung Noh, Hyun-Woo Cho1, Seung Woon Myung*
Department of Chemistry, Kyonggi University, Korea
1Department of Natural Science Chemistry, Kyonggi University, Korea
Famphur and Fenpyroximate are used for a variety of crops including fruit, balloon flower roots, and vegetables as a type of pesticide, and they are regulated in each country. Therefore, the method of sample preparing and analysis were established to accurately quantify the remaining famphur and fenpyroximate in green tea using HPLC - UV. Parameters for sample clean up and concentration were optimised and verified. Experiments were carried out to obtain optimal parameters such as the kinds and volumes of extraction solvent and dispersive solvent, the pH effect, and the effect of salt. Chromatographic separation with HPLC - UV was performed using the eclipse XDB-C18 (2.1 mm id × 150 mm length, 4.6 μm particle size) column and gradient elution mode using water and acetonitrile. Optimized parameters for extraction of the famphur and fenpyroximate; the type and volume of extraction solvent, 1, 2 - dichloroethane, 100 μL; the type and volume of dispersive solvent, methanol, 1000 μL; pH 6; salt 0 g. Limit of detection and limit of quantification were obtained in the range of 0.010-0.031 mg/L and 0.005-0.017 mg/L, respectively. The accuracy and precision obtained at the working range were 96.7-107.0 % and 2.7 - 14.2 % (RSD), respectively. The linear correlation coefficient (R2) was obtained in the range of 0.9959 to 0.9991. The established method was applied to five types of green tea sold in the market and monitored.