A glassy carbon electrode (GCE) was modified with magnetic molecularly imprinted polymers (mMIPs) using catechin as a template, reduced graphene oxide (rGO), and zeolitic imidazolate frameworks-8 (ZIF-8) for the sensitive detection of catechin (mMIPs/rGO-ZIF-8/GCE). The prepared rGO, ZIF-8, and mMIPs exhibited typical structures and properties determined by various characterizations. The mMIPs showed good selectivity for catechin among several structural analogs. The mMIPs/rGO-ZIF-8/GCE showed a higher maximum peak current for catechin than that of a single component modified GCE. After the optimization of the material ratio, coating amounts, pH, and scan rate, the mMIPs/rGO-ZIF-8/GCE exhibited good selectivity, good linearity, and a low detection limit (LOD) for catechin. The linear range was 0.01 nmol/L–10 μmol/L and the LOD was 0.003 nmol/L (S/N = 3). The relative standard deviations for reproducibility and stability tests (n = 6) were 5.2% and 6.1%, respectively. A recovery between 99.1 and 101.3% was obtained in the detection of catechin in spiked samples. Based on these findings, the proposed mMIPs/rGO-ZIF-8/GCE could be developed further, and future research could be conducted on alternate fabrication strategies and methods to create more portable and practical electrochemical sensors.
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We would like to thank Editage (www.editage.cn) for English language editing.
This work was supported by the Central Public-interest Scientific Institution Basal Research Fund (No. 1610242020005), Open project of key laboratory of biology and processing for bast fiber crops, MARA, and National Agricultural Science and Technology Innovation Project (Characteristic fruit and vegetable innovation team, ASTIP-IBFC05).
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Fu, Y., You, Z., Xiao, A. et al. Magnetic molecularly imprinting polymers, reduced graphene oxide, and zeolitic imidazolate frameworks modified electrochemical sensor for the selective and sensitive detection of catechin. Microchim Acta 188, 71 (2021). https://doi.org/10.1007/s00604-021-04724-1
- Electrochemical detection
- Magnetic nanoparticles
- Molecularly imprinted polymer
- Reduced graphene oxide
- Zeolitic imidazolate frameworks