Cadmium cobaltite nanosheets synthesized in basic deep eutectic solvents with oxidase-like, peroxidase-like, and catalas
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ORIGINAL PAPER
Cadmium cobaltite nanosheets synthesized in basic deep eutectic solvents with oxidase-like, peroxidase-like, and catalase-like activities and application in the colorimetric assay of glucose Xin Wei 1,2 & Jia Chen 1 & Mohammad Chand Ali 1 & Jean Claude Munyemana 1,3 & Hongdeng Qiu 1,2,3 Received: 16 November 2019 / Accepted: 23 April 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Cadmium cobaltite (CdCo2O4) nanosheets were ultra-fast synthesized based on a new basic deep eutectic solvent (DES) which served simultaneously as reactant, solvents, and template. Interestingly, the nanosheets were found to exhibit triple-enzyme mimetic activities including oxidase-like activity, peroxidase-like activity, and catalase-like activity. Their catalytic activity followed the typical MichaelisMenten kinetics, and high affinity for H2O2 and TMB was observed. Based on the superior peroxidase-like catalytic activity of CdCo2O4 nanosheets, a highly sensitive and selective colorimetric strategy for the determination of glucose was established. Under optimized conditions, the absorbance at 652 nm increases linearly in the 0.5 to 100 μM concentration range, and the limit of detection is 0.13 μM (S/N = 3). Finally, the method was successfully used for determination of glucose in serum samples. Keywords Cobalt-based metal oxide . Triple-enzyme mimetic activity . Nanozyme . Bioassay . 3,3′,5,5′-Tetramethylbenzidine . Hydrogen peroxide
Introduction The natural enzymes have the advantages of high specificity and catalytic ability, but they possess several intrinsic defects such as low stability and easy denaturation [1]. Therefore, it is necessary to explore efficient enzyme mimetic catalysts with high stability and easy preparation. Nanomaterial-based artificial enzyme (also known as nanozyme) has attracted great attention from Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04298-4) contains supplementary material, which is available to authorized users. * Jia Chen [email protected] * Hongdeng Qiu [email protected] 1
CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2
College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi 830054, China
3
University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, China
researchers, because it can offer low coordinated sites, surface vacancies, and high surface areas that are responsible for the higher catalytic activity [2–4], since it was first reported that Fe3O4 nanoparticles exhibited mimic peroxidase-like activity [5]. The study of nanozyme has become a hot spot in the field of catalysis [6, 7]. Nanozymes can be roughly divided into the following categories [8]: metal oxides (e.g., V2O5 [9], AgVO3 [10]), noble metals (e.g., Au [11], Pt [12]), metal organic frameworks (e.g., ZI
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