College of Chemistry and Chemical Engineering , Chifeng University , Chifeng 024000 , People's Republic of China.
Food Science and Technology Programme, c/o Department of Chemistry , National University of Singapore , Singapore 117543 , Singapore.
J Agric Food Chem. 2019 Feb 13;67(6):1760-1770. doi: 10.1021/acs.jafc.8b04980. Epub 2019 Jan 29.
A QuEChERS-type method without matrix interference was designed and developed to determine organophosphorus pesticide residues in edible vegetable oils, based on dispersive solid-phase extraction with cleanup using UiO-66 as sorbent. Microporous UiO-66 directly and selectively adsorbed organophosphorus pesticides and excluded interfering compounds. Clean analytes were obtained by elution and analyzed using gas chromatography-tandem mass spectrometry. The dispersive solid-phase extraction conditions (amount of adsorbent, extraction time, desorption solvent volume, and elution time) were optimized. The limits of detection of the pesticides in vegetable oils were 0.16-1.56 ng/g. Under optimized conditions, the average pesticide recoveries were 81.1-113.5%. The intraday and interday relative standard deviations for analyte recovery were <8.2 and <13.9%, respectively. Thus, the method is reliable and could detect organophosphorus pesticide residues in edible vegetable oils. Furthermore, UiO-66 can be easily recycled and reused at least 10 times, reducing the cost of analysis.
建立了一种基于分散固相萃取-微多孔 UiO-66 吸附净化的 QuEChERS 型方法，用于测定食用植物油中的有机磷农药残留。微孔 UiO-66 可直接、选择性地吸附有机磷农药，排除干扰化合物。通过洗脱得到净化的分析物，并用气相色谱-串联质谱法进行分析。优化了分散固相萃取条件（吸附剂用量、萃取时间、洗脱溶剂体积和洗脱时间）。该方法在植物油中的检测限为 0.16-1.56ng/g。在优化条件下，农药的平均回收率为 81.1-113.5%。分析物回收率的日内和日间相对标准偏差分别小于 8.2%和 13.9%。因此，该方法可靠，可用于检测食用植物油中的有机磷农药残留。此外，UiO-66 可至少重复使用 10 次，从而降低分析成本。
