|Title:||Water with Low Concentration of Surfactant in Dispersed Solvent-Assisted Emulsion Dispersive Liquid-Liquid Microextraction for the Determination of Fungicides in Wine||Authors:||Tseng, Wan-Chi
|Keywords:||water with low concentration of surfactant;dispersive liquid-liquid microextraction;fungicides;gas chromatography;improved solvent collection system;wine||Issue Date:||2014||Journal Volume:||62||Journal Issue:||37||Start page/Pages:||9059-9065||Source:||J. Agric. Food Chem.||Abstract:||
A sample preparation method, dispersive liquid-liquid microextraction assisted by an emulsion with low concentration of a surfactant in water and dispersed solvent coupled with gas chromatography-mass spectrometry, was developed for the analysis of the fungicides cyprodinil, procymidone, fludioxonil, flusilazole, benalaxyl, and tebuconazole in wine. A microsyringe was used to withdraw and discharge a mixture of extraction solvent and 240 mu L of an aqueous solution of Triton X-100 (the dispersed agent) four times within 10 s to form a cloudy emulsion in the syringe. This emulsion was then injected into a 5 mL wine sample spiked with all of the above fungicides. The total extraction time was approximately 0.5 min. Under optimum conditions using 1-octanol (12 mu L) as extraction solvent, the linear range of the method in analysis of all six fungicides was 0.05-100 mu g L-1, and the limit of detection ranged from 0.013 to 0.155 mu g L-1. The absolute recoveries (n = 3) and relative recoveries (n = 3) were 30-83 and 81-108% for white wine at 0.5, 5, and 5 mu g L-1 and 30-92 and 81-110% for red wine, respectively. The intraday (n = 7) and interday (n = 6) relative standard deviations ranged from 4.4 to 8.8% and from 4.3 to 11.2% at 0.5 mu g L-1, respectively. The method achieved high enrichment factors. It is an alternative sample preparation technique with good performance.
|Appears in Collections:||法醫學科所|
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