Journal
MICROCHIMICA ACTA
Volume 173, Issue 3-4, Pages 453-457Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-011-0577-4
Keywords
Ultrasound-assisted extraction; Ionic liquids; Dispersive liquid-phase microextraction; Red wine; Fungicides; HPLC
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Funding
- 40th Scientific Research Foundation for the Returned Overseas Chinese Scholars
- State Education Ministry
- DR Research Foundation of Hebei North University, PRC
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A new method was developed for the determination of fungicides in red wine using ultrasound-assisted ionic liquid dispersive liquid-phase microextraction followed by high-performance liquid chromatography. The ionic liquid, 1-hexyl-3-methylimidazolium hexafluorophosphate (IL) was quickly disrupted by ultrasonication and dispersed in wine as fine droplets. At this stage, the analytes were extracted into the fine droplets of IL. After centrifugation, the concentration of the enriched fungicides in the sedimented phase was determined. Extraction conditions including the type of extraction solvent, the extraction solvent volume, ultrasonication time, centrifugation time and sample pH were optimized. The performance of the method was studied in terms of linearity, precision, and recovery. Quantitative recoveries (> 70%) except for pyrimethanil were obtained, and method precision was also satisfactory (RSD < 10%). Enrichment factors range from 100 to 200, and the limits of detection are at the low mu g per liter level for most of the target compounds.
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