A novel electrochemical sensor based on core-shell-structured metal-organic frameworks: The outstanding analytical performance towards chlorogenic acid

Publication date: 1 May 2019

Source: Talanta, Volume 196

Author(s): Yuling Chen, Wei Huang, Kuijun Chen, Ting Zhang, Yang Wang, Jianmin Wang

Abstract

In this paper, a superparamagnetic Fe₃O₄ core encapsulated into a metal-organic framework shell, Fe₃O₄@MIL-100(Fe), was successfully synthesized taking advantage of layer-to-layer method. The thickness of the shell can be controlled by self-assembly cycles between FeCl₃·6H₂O and 1,3,5–benzenetricarboxylic acid (H₃BTC). The composites were characterized by Powder X-ray diffracrion (XRD), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR) and N₂ adsorption/desorption isotherms. Then, the synthesized material was firstly used to fabricate a novel electrochemical sensor for chlorogenic acid (CGA). Under the optimal conditions, this electrochemical sensor can detect CGA quantitatively in the range of 0.1–10.0 μmol L⁻¹ and 10.0–460 μmol L⁻¹. The limit of detection (LOD) can be as low as 0.05 μmol L⁻¹. Considering there are little common interfering materials, this novel chlorogenic acid sensor was further applied in real samples to detect the content of CGA.

Graphical abstract

Core-shell structured MOFs composites were facilely synthesized for highly sensitive and selective electrochemical detection of chlorogenic acid.

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