Electrochemical Nanozyme Sensor Based on MoS 2 -COOH-MWCNT Nanohybrid for a New Plant Growth Regulator 5-Nitroguaiacol
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Electrochemical Nanozyme Sensor Based on MoS2-COOH-MWCNT Nanohybrid for a New Plant Growth Regulator 5-Nitroguaiacol Xinyu Lu 1,2 & Guixia Liu 3 & Peiwen Di 3 & Yingying Li 1,2 & Ting Xue 1,2 & Xuemin Duan 1 Yue Cai 1,2 & Quan Xu 1,2 & Jingkun Xu 1,4
&
Yangping Wen 2 & Yifu Zhu 1,2 &
Received: 11 February 2020 / Accepted: 14 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A nanozyme sensor consisted of both carbonylated multi-walled carbon nanotubes (COOH-MWCNT) and two-dimensional layered molybdenum disulfide (MoS2) nanosheets for the sensitive detection of 5-nitroguaiacol sodium (5-NG) in tomato and broiler feed under the optimal conditions was successfully developed. MoS2-COOH-MWCNT nanohybrid was simply obtained by ultrasonic preparation in presence of Nafion. The MoS2-COOH-MWCNT film was characterized, and parameters of their film electrodes such as pH, scan rates, the percentage content of Nafion (Nf), and the ratio between COOH-MWCNT and MoS2 were optimized. The MoS2-COOH-MWCNT nanohybrid was used to detect 5-NG in tomato and broiler feed, and their recoveries were 102.22 and 93.2%, respectively. The electrocatalytic oxidation mechanism of 5-NG and oxidase-like (nanozyme) kinetics of MoS2-COOH-MWCNT nanohybrid were investigated. The fabricated nanozyme sensor displayed good electrochemical responses, wide linear ranges of 0.1–70 μM with limit of detection (LOD) 0.02 μM, unique oxidase-like characteristics, and good practicability, which will provide a new sensing platform based on inorganic nanomaterials with enzyme-like (nanozyme) characteristics for the determination of 5-NG in plant-derived agro-products and/or plant-derived animal feeds. Keywords 5-Nitroguaiacol sodium . Nanohybrid sensor . Electrochemical detection . Theory calculation
Introduction Sodium nitrophenolate is a new plant growth regulator with a chemical composition of 5-nitroguaiacol sodium (5-NG), sodium 2-nitrophenol (2-NG), and sodium 4-nitrophenol (4-
* Xuemin Duan [email protected] * Yangping Wen [email protected] 1
Jiangxi Provincial Key Laboratory of Drug Design and Evaluation, School of Pharmacy, Jiangxi Science & Technology Normal University, Nanchang 330013, People’s Republic of China
2
Institute of Functional Materials and Agricultural Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, People’s Republic of China
3
Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People’s Republic of China
4
College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, People’s Republic of China
NG), which can influence numerous aspects of the plant development and physiology. For instance, it can promote wound healing and accelerate plant growth. Among three components, 5-NG is their main ingredient, which can improve crop quality and yield. However, unsuitable amounts may cause plant malformations such as potential teratog
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