Journal
FOOD CHEMISTRY
Volume 345, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128807
Keywords
Pesticide; Matrix effect; Dispersive solid-phase extraction; Metal-organic framework; Organic food; Produce safety; Lettuce; Leafy green vegetable
Funding
- National Natural Science Foundation of China [31960493, 31660483]
- National Key Research and Development Project [2019YFC1604904]
- Science and Technology Innovation Platform Project of Jiangxi Province [20192BCD40001]
- Singapore Ministry of Education Academic Research Fund Tier 1 [R-160000-A40-114]
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An efficient dispersive solid-phase extraction method using UiO-66 as sorbent has been developed for tracing pesticide residues in vegetables. The method demonstrates good extraction efficiency and reusability, with optimized conditions achieving excellent detection performance.
An efficient dispersive solid-phase extraction method was developed to trace pesticide residues in commonly consumed vegetables. In this method, UiO-66 with uniform micropores was used as sorbent, and gas chromatography-mass spectrometry was applied to detect the pesticides. Thanks to the size sieving action of uniform micropores, UiO-66 directly extracted the target pesticides from vegetable matrices and excluded the relatively large matrix compounds. This well eliminated the matrix effect. The important experimental conditions were evaluated by orthogonal array experimental design. In optimized conditions, good linearity (R-2 >= 0.99), detection limits (0.4-2.0 ng/g), recoveries (60.9-117.5%) and precision (relative standard deviations < 14.6%) were achieved. Moreover, the sorbent UiO-66 can be reused more than 20 times. These demonstrate a simple, reliable and robust method to screen the pesticide residues in vegetables. Furthermore, the validated method was applied to detect the pesticides in various organic and conventional vegetables.
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