Abstract
A method for detecting the organophosphorus pesticides residue and aflatoxins in China herbal tea has been developed by UPLC-MS/MS coupled with vortex-assisted dispersive liquid-liquid microextraction (DLLME). The extraction conditions for vortex-assisted DLLME extraction were optimized using single-factor experiments and response surface design. The optimum conditions for the experiment were the pH 5.1, 347 µL of chloroform (extraction solvent) and 1614 µL of acetonitrile (dispersive solvent). Under the optimum conditions, the targets were good linearity in the range of 0.1 µg/L–25 µg/L and the correlation coefficient above 0.9998. The mean recoveries of all analytes were in the ranged from 70.06%–115.65% with RSDs below 8.54%. The detection limits were in the range of 0.001 µg/L–0.01µg/L. The proposed method is a fast and effective sample preparation with good enrichment and extraction efficiency, which can simultaneously detect pesticides and aflatoxins in China herbal tea.
Highlights
Herbal tea is a kind of soup made with natural Chinese herbal medicine as raw materials according to the local climate, water and soil characteristics with the unique cooking methods by residents in the southern coastal areas of China [1,2,3,4], and guided by the theory of traditional Chinese medicine (TCM) health in the process of longer-term disease prevention and health care
The optimal dispersive liquid-liquid microextraction (DLLME) conditions were determined for twelve targets in herbal tea samples, and the chloroform and acetonitrile be used as the extractant and dispersant, respectively
A blank herbal tea sample spiked with 12 analytes (10 μg/L) was applied to assess the performance of the pre-treatment method and were calculated using the following equations: EF =
Summary
Herbal tea is a kind of soup made with natural Chinese herbal medicine as raw materials according to the local climate, water and soil characteristics with the unique cooking methods by residents in the southern coastal areas of China [1,2,3,4], and guided by the theory of traditional Chinese medicine (TCM) health in the process of longer-term disease prevention and health care It has the functions of clearing away heat and detoxifying, stimulating thirst, and preventing diseases [5,6,7] and as a social and recreational pastime [8,9,10,11]. The pesticide residues maybe be Molecules 2019, 24, 1029; doi:10.3390/molecules24061029 www.mdpi.com/journal/molecules
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