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. 2023 May 30:409:135272.
doi: 10.1016/j.foodchem.2022.135272. Epub 2022 Dec 22.

Synthesis of spindle-like amino-modified Zn/Fe bimetallic metal-organic frameworks as sorbents for dispersive solid-phase extraction and preconcentration of phytohormoes in vegetable samples

Peige Qin  1 , Dengke Chen  1 , Dan Li  1 , Mengyuan Li  1 , Mengyao Mu  1 , Yanmei Gao  1 , Shiping Zhu  1 , Minghua Lu  2
Affiliations

Synthesis of spindle-like amino-modified Zn/Fe bimetallic metal-organic frameworks as sorbents for dispersive solid-phase extraction and preconcentration of phytohormoes in vegetable samples

Peige Qin et al. Food Chem. .

Abstract

Amino-modified Zn/Fe bimetallic metal-organic frameworks (NH2-Zn/Fe-MIL-88) were synthesized using a one-step solvothermal method with FeCl3·6H2O and Zn(NO3)2·6H2O as metal salts and 2-aminoterephthalic acid as organic ligand. The morphology of NH2-Zn/Fe-MIL-88 can be regulated from octahedral-like to spindle-like with changing molar ratios of metal salts. Using NH2-Zn/Fe-MIL-88 as sorbent, a dispersive solid-phase extraction with putting sorbents into sample solution to extract targets was developed to preconcentrate phytohormones in vegetables. To study the extraction efficiency, a series of NH2-Zn/Fe-MIL-88s with varying molar ratios of metal salts were prepared. The results indicated that NH2-Zn/Fe-MIL-88(1) presented the highest extraction efficiency (82.6 %-98.1 %) to phytohormones among all prepared NH2-Zn/Fe-MIL-88(x). The limits of detection were calculated at 0.07-0.15 ng/mL. The adsorption isotherms and kinetic parameters of NH2-Zn/Fe-MIL-88 for phytohormones were conformed to Langmuir and pseudo-second-order models. The NH2-Zn/Fe-MIL-88 as sorbent combined with HPLC was applied to detect phytohormones in cucumber and tomato samples.

Keywords: 1-Naphthylacetic acid (PubChem CID 6862); 2-Naphthylacetic acid (PubChem CID 11393); 6-Benzylaminopurine (PubChem CID 62389); Abscisic acid (PubChem CID 5375199); Bimetallic metal-organic framework; Dispersive solid-phase extraction; Indole-3-acetic acid (PubChem CID 802); Indole-3-butyric acid (PubChem CID 8617); NH(2)-Zn/Fe-MIL-88; Phytohormones; Zn/Fe bimetal-organic framework.

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Conflict of interest statement

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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