期刊
出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/03601230902934587
关键词
Food analysis; microwave extraction; solid phase micro-extraction; pesticides; pyrethroids
资金
- Fond Europeen de Developpement Regional (FEDER)
- Conseil General de la Dordogne and the European Council (Marie-Curie) [QLK1-CT-2000-51258]
A new analytical method using focused microwave-assisted extraction (FMAE), coupled with solid phase micro-extraction (SPME), has been elaborated to determine 25 pesticides used in tomato cultivation. Microwave energy was used for a fast and controlled heating of solvent to selectively extract compounds. Calibration curves were plotted from blank tomato samples spiked at different concentrations with standards. A linear response was obtained between 10 and 1000 mu g/Kg for pyrethroids and between 0.1 and 5000 mu g/Kg for other compounds. For all studied substances, the resulting correlation coefficient (r(2)) was greater than 0.99. Limits of detection (LOD) and quantification (LOQ) were measured lower than 8 and 25 mu g/Kg, respectively. The relative standard deviation (RSD) was determined below 15% for all pesticides. Field incurred tomato samples were used to validate the new FMAE/SPME method. Observed analysis results by using this technique were in good agreement compared to those obtained by two accredited trading laboratories using traditional methods. Four tomato samples, bought in a local market, were also tested with the FMAE/SPME method.
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