Journal
FOOD CHEMISTRY
Volume 274, Issue -, Pages 891-899Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.09.048
Keywords
Deep eutectic solvent; Hexafluoroisopropanol; Dispersive liquid-liquid microextraction; Pyrethroids; Tea beverages; Fruit juices
Funding
- National Natural Science Foundations of China [81673394, 81373045]
- Provincial Natural Science Foundation of Hubei of China [2015CFA139]
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A series of new hydrophobic deep eutectic solvents (DESs), which are liquid at room temperature and have high density (> 1.4 g mL(-1)), were synthesized using hexafluoroisopropanol (HFIP) as hydrogen-bond donor and L-carnitine/betaine as hydrogen-bond acceptor. Then these hydrophobic DESs were used as extraction solvents to establish dispersive liquid-liquid microextraction (DLLME) method for extraction of pyrethroids. The DES extraction phase was in the bottom after DLLME, being easy to be collected for analysis. After optimization by one-variable-at-a-time and response surface methodology, the enrichment factors of 265-360 were achieved for five pyrethroids. The proposed DLLME method coupled with HPLC has good performance: linear ranges of 0.25/0.5/1-100/200/400 ng/mL (r >= 0.9990), limits of detection of 0.06-0.17 ng mL(-1), relative recoveries of 85.1-109.4%, intra-day and inter-day RSDs below 7.5%. The novel DLLME method is simple, rapid, highly efficient and eco-friendly for extraction of pyrethroids in real tea beverages and fruit juices.
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