科研之友
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摘要
In this study a novel, simple, rapid, and effective method was successfully developed for the determination of pesticide residues in red wine samples. Sample preparation involved extraction of pesticide residues into acetonitrile by QuEChERS (quick, easy, cheap, effective, rugged, and safe) and cleanup with a rapid push-through mini-cartridge filter instead of dispersive solid-phase extraction (dSPE). The red wine extract was cleaned up by passing it through a mini-cartridge containing primary secondary amine sorbent that retains organic acids, sugars, and polyphenolic pigments. The cleaned extract was analyzed by liquid chromatography-tandem mass spectrometry (LC-MS-MS). The cleanup procedure was simple and required less than 1 min per sample. Satisfactory recoveries ranging from 81.6% to 112.2% with relative standard deviations less than 10.8% were achieved. The linear dynamic range was 2-400 ng/mL with a correlation coefficient greater than 0.9940. The limit of detection and limit of quantification were in the range of 0.01-0.40 and 0.05-1.33 ng/mL, respectively. Six commercially available red wine samples were tested in this study, three of which were found to be positive for the presence of pesticides.
- 出版日期2012-10
