Dispersive solid-phase extraction using microporous metal-organic framework UiO-66: Improving the matrix compounds removal for assaying pesticide residues in organic and conventional vegetables. (30th May 2021)

• Record Type: Journal Article
• Authors: Mao, Xuejin; Xiao, Weiming; Wan, Yiqun; Li, Zhanming; Luo, Dongmei; Yang, Hongshun
• Is Part Of: Food chemistry. Volume 345(2021)
• Publication Date: 2021-05-30
• Subjects: Pesticide -- Matrix effect -- Dispersive solid-phase extraction -- Metal–organic framework -- Organic food -- Produce safety -- Lettuce -- Leafy green vegetable; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2020.128807
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: An efficient method based on UiO-66 was developed to trace pesticides in vegetable. UiO-66 adsorbed pesticides and excluded matrix compounds via size sieving action. The matrix effect was well eliminated in the method. The sorbent UiO-66 exhibits excellent reusability and stability. The method was used to detect pesticides in organic and conventional vegetables. Abstract: 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.