A nanoporous carbon derived from bimetallic organic-framework for magnetic solid-phase extraction of bisphenol analogs

Ma, Shiyao; Wang, Xue; Duan, Huiling; Wang, Jun; Zhan, Han-Ying; Zhang, Zhiqi

doi:10.1016/j.talanta.2019.04.079

Cited by 28 publications

(1 citation statement)

References 37 publications

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“…According to previous literature [ 29 ], Zn/Fe bimetallic zeolite type MOF (Zn/Fe-ZIF) was first synthesized as follows: The solution A was obtained by weighing 21.27 g of Zn(NO 3 ) 2 ·6H 2 O and 0.994 g of FeSO 4 ·7H 2 O into a flask containing 100 mL of methanol and stirring continuously until completely dissolved. Solution B was obtained by adding 3.75 g of 2-methylimidazole to 100 mL of methanol and stirring until completely dissolved.…”

Section: Methodsmentioning

confidence: 99%

A Label-Free Electrochemical Aptasensor Based on Zn/Fe Bimetallic MOF Derived Nanoporous Carbon for Ultra-Sensitive and Selective Determination of Paraquat in Vegetables

Tao

et al. 2022

Foods

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Paraquat (PQ) has high acute toxicity, even at low concentrations. For most people, the main pathway of exposure to PQ is through the diet. Therefore, the development of simple and efficient methods for PQ testing is critical for ensuring food safety. In this study, a new electrochemical detection strategy for paraquat is proposed based on the specific binding of PQ to its nucleic acid aptamer. Firstly, the Zn/Fe bimetallic ZIF derived nanoporous carbon (Zn/Fe-ZIF-NPC) and nickel hexacyanoferrate nanoparticles (NiHCF-NPs) were sequentially modified onto the glassy carbon electrode (GCE). NiHCF-NPs served as the signal probes, while Zn/Fe-ZIF-NPC facilitated electron transfer and effectively enhanced the sensing signal of NiHCF-NPs. Au nanoparticles (AuNPs) were then electrodeposited on the NiHCF-NPs/Zn/Fe-ZIF-NPC/GCE and then the thiolated aptamer was assembled on the AuNPs/NiHCF-NPs/Zn/Fe-ZIF-NPC/GCE via Au-S bonding. When incubated with PQ, the formation of PQ–aptamer complexes delayed the interfacial electron transport reaction of NiHCF-NPs, which caused a decrease in the current signals. As a result, simple and highly sensitive detection of PQ can be readily achieved by detecting the signal changes. A linear range was obtained from 0.001 to 100 mg/L with a detection limit as low as 0.34 μg/L. Due to the recognition specificity of the aptamer to its target molecule, the proposed method has excellent anti-interference ability. The prepared electrochemical aptasensor was successfully used for PQ assay in lettuce, cabbage and agriculture irrigation water samples with recoveries ranging from 96.20% to 104.02%, demonstrating the validity and practicality of the proposed method for PQ detection in real samples.

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Section: Methodsmentioning

confidence: 99%