酸体系下改良分散固相萃取用于茶叶农残快速检测的前处理技术

doi:10.13305/j.cnki.jts.2023.03.008

Abstract

Abstract: The false-positive results encountered in the rapid detection of pesticide residues in tea samples are primarily caused by matrix interference. However, limited by the physical and chemical properties of tea matrix components (e.g., caffeine), the development of pretreatments suffers major dilemmas in matrix removal effectiveness. In current work, a novel pretreatment method for tea samples was proposed by developing specific removal procedures based on the molecular structure characteristics of the main matrix components. On the basis of conventional pretreatment for tea samples, the novel method introduced acid solutions and polyvinylpolypyrrolidone adsorbents, which reduced the matrix effect of tea sample detection significantly with a high matrix removal rate of more than 99.99%. Under the assistance of the current pretreatment, the rapid detection of methomyl and carbofuran residues in tea samples was successfully achieved accurately. The limits of detection for carbofuran and methomyl in tea were 0.57 mg·kg^-1 and 0.20 mg·kg^-1, respectively.

Key words: tea, matrix interference, pretreatment, pesticide residue, rapid detection

CLC Number:

S571.1

WU Zhenghao, ZHENG Qinqin, HAO Zhenxia, WANG Chen, CHEN Hongping, LU Chengyin. Acid-assisted Improvement of Dispersive Solid Phase Extraction for Rapid Detection of Pesticide Residues in Tea[J]. Journal of Tea Science, 2023, 43(3): 389-398.

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Acid-assisted Improvement of Dispersive Solid Phase Extraction for Rapid Detection of Pesticide Residues in Tea

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