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A density-tunable liquid-phase microextraction system based on deep eutectic solvents for the determination of
Wenwen Deng1, Anqi Huang2, Qutong Zheng2
1Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), Wuhan University School of Pharmaceutical Sciences, Wuhan 430071, China; National 111 Center for Cellular Regulation and Molecular Pharmaceutics, School of Bioengineering and Food Science, Hubei University of Technology, Wuhan, Hubei, China.
Abstract:
A novel density-tunable liquid-phase microextraction (DT-LPME) system was developed with high-density deep eutectic solvents (DESs) as extractant and low-density organic solvents as emulsifier and density regulator. DES-rich phase was induced to form in the bottom or in the top by adjusting the emulsifier amount. This system was used to directly extract polycyclic aromatic hydrocarbons (PAHs) from liquid and solid foods, and the obtained DES-rich phase was easy to be collected for quantification. The method (LPME with HPLC-fluorescence detector) has linearity (R2 > 0.9974), detection limits of 0.6-4.2 ng L-1 for liquid foods and 0.05-0.35 ng g-1 for solid foods, recoveries of 86.2-114.9%, and intra-day/inter-day RSDs below 6.6%. The method was applied to detect PAHs in real samples, and the PAHs residue was found in honey and five solid foods. The DT-LPME method is simple, fast, green and suitable for direct extraction of analytes from both liquid and solid samples.
