Au-Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron modified electrode for electrochemical determinat
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ORIGINAL PAPER
Au-Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron modified electrode for electrochemical determination of quercetin Guiling Luo 1 & Ying Deng 1 & Lin Zhu 1 & Juan Liu 2 & Bingxue Zhang 1 & Yan Zhang 1 & Wei Sun 1
&
Guangjiu Li 2
Received: 4 March 2020 / Accepted: 22 August 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A core-shell ZIF-8@ZIF-67 was synthesized and pyrolyzed to get a Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron (Co@NCNHP). Then Au nanoparticles were formed on the surface and core of Co@NCNHP to obtain an Au-Co bimetal decorated NCNHP (Au-Co@NCNHP). The resultant nanocomposite was characterized by various methods including transmission electron microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The Au-Co@NCNHP-based electrochemical sensor displayed an obviously high electrocatalytic response to the oxidation of quercetin, which was attributed to the synergistic effects of Au-Co bimetal nanoparticles and N-doped carbon nanotube with hollow polyhedron. Under the optimal conditions, the oxidation peak currents exhibited a wide linear dynamic range for quercetin concentration from 0.050 to 35.00 μmol/L, and the detection limit was 0.023 ± 0.002 μmol/L (S/N = 3). The analytical applications of the proposed electrochemical sensor were checked by determining the content of quercetin in medical and onion samples with satisfactory results. Keywords Core-shell ZIF-8@ZIF-67 . Au-Co bimetal nanoparticles . N-doped carbon nanotube . Hollow polyhedron . Quercetin . Electroanalytical Chemistry
Introduction Quercetin (3,3′,4′,5,7-penta hydroxyl flavones, QR) is widely present in food of plant origin (such as onions, apples, and tea), which has diverse biological activities such as antitumor
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04531-0) contains supplementary material, which is available to authorized users. * Wei Sun [email protected] 1
Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, Key Laboratory of Functional Materials and Photoelectrochemistry of Haikou, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, People’s Republic of China
2
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science of Ministry of Education, Shandong Key Laboratory of Biochemical Analysis, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
activity, cardiovascular protection, antioxidant cataract prevention, and anticancer [1]. Because biological functions are very advantageous for human’s health, sensitive determination of QR is very crucial, especially in natural pharmaceutical chemistry, biochemistry, and clinical medicine. Compared with other analytical methods such as high-performance liqui
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