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- Title
QuEChERS-超高效液相色谱-串联质谱法测定山葵中乐果的残留量.
- Authors
李晋津; 李辉; 邵辉; 刘磊; 李娜; 宋淑荣; 郭永泽; 张玉婷; 陈秋生
- Abstract
Objective To establish a method for the determination of dimethoate residues in horseradish by quechers-ultra performance liquid chromatography-tandem mass spectrometry. Methods Horseradish samples were extracted with acetonitrile and water, the supernatant was taken and purified by C18, PSA and anhydrous MgSO4 after salting-out, in the electrospray positive ion (ESI+) mode, by optimizing chromatographic separation conditions, and the multi-reaction monitoring (MRM) mode was used for ultra performance liquid chromatography-tandem mass spectrometry, combined with the dimethoate standard curve to quantify. Results The method has a good linear relationship in the concentration range of 0.00125-0.5 mg/L. The linear equation was Y=2371831.1X+10169.6, and the correlation coefficient (r) was 0.9998 (n=6). The average recoveries of dimethoate were 88.1%-97.8% at the concentrations of 0.01, 0.1 and 2 mg/kg, and the relative standard deviations (RSDs) were 1.0%-3.5% (n=5). The limit of quantitative of the method was 0.01 mg/kg in horseradish. Conclusion The method is simple to operate, effective in separation and purification, and the sensitivity, accuracy and precision can meet the requirements of pesticide residue detection, which can be used for detection of residues in horseradish.
- Publication
Journal of Food Safety & Quality, 2018, Vol 9, Issue 17, p4503
- ISSN
2095-0381
- Publication type
Article