Journal
FOOD CHEMISTRY
Volume 240, Issue -, Pages 1233-1242Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.08.061
Keywords
Microwave-assisted extraction; Ultrasonic-assisted dispersive liquid-liquid microextraction; High performance liquid chromatography; Pyrethroids; Litchi fruit
Funding
- Science and Technology Planning Project of Guangdong Province [2016A040403119]
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A novel method for simultaneous determination of pyrethroids residues in Litchi fruit has been developed by HPLC-UV detection using microwave-assisted extraction (MAE) coupled with ultrasonic-assisted dispersive liquid-liquid microextraction (UADLLME). Extraction conditions of MAE and UADLLME were respectively investigated by single-factor experiments and response surface methodology. Optimized experimental conditions included 310 mu L of chlorobenzene as extraction solvent, 1.3 mL of ethanol as dispersive solvent and 3 min of extraction time for UADLLME. In the case of MAE, extraction temperature of 70 degrees C, extraction time of 4 min and solvent-to-materials ratio of 40: 1 were adopted. Results demonstrated that the proposed method had good performance with linearity of 0.0050-4.98 mg/L, recovery of 83.3-91.5%, RSDs below 5.6% and detection limit (LOD) of 1.15-2.46 mu g/L for six pyrethroids, offering higher extraction efficiency and larger enrichment factor. MAE-UADLLME provided a sensitive and efficient alternative to determination of trace amounts of pesticides residues in food samples.
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