期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1218, 期 38, 页码 6603-6611出版社
ELSEVIER
DOI: 10.1016/j.chroma.2011.07.054
关键词
Dispersive liquid-liquid microextraction; Non-chlorinated extractant; Fungicides; Wine analysis; Gas chromatography-mass spectrometry
资金
- Spanish Government
- E.U. [CTQ2009-08377]
- Isidro Parga Pondal
A novel and low solvent consumption method for the sensitive determination of fungicide residues in wine samples is proposed. Analytes were extracted by dispersive liquid-liquid microextraction (DLLME) and further determined by gas chromatography-mass spectrometry (GC-MS). Under optimized conditions, a binary mixture of acetone and 1-undecanol (0.5 and 0.05 mL, respectively) was used to extract target compounds from diluted (1:1) wine samples. After centrifugation, the floating phase of 1-undecanol was solidified and separated from the liquid hydro-alcoholic matrix. Thereafter, it was allowed to melt at room temperature and injected in the GC-MS system. The method showed relative standard deviations (RSDs, %) below 13%, limits of quantification (LOQs) between 0.2 and 3.2 ng mL(-1) and linear responses for concentrations up to 300 ng mL(-1). The efficiency of the liquid-phase microextraction process was scarcely affected by the characteristics of wine samples, consequently pseudo-external standard calibration (using matrix matched standards of red and white wine) sufficed to achieve acceptable accuracy values: relative recoveries from 81 to 120%. The applicability of the method was demonstrated with commercial wine samples. (C) 2011 Elsevier B.V. All rights reserved.
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