Mesoporous material-based manipulation of the enzyme-like activity of CoFe2O4 nanoparticles

Fan, Yingwei; Shi, Wenbing; Zhang, Xiaodan; Huang, Yuming

doi:10.1039/c3ta14697a

Cited by 59 publications

(32 citation statements)

References 29 publications

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“…The pH factor plays an important role in the reactions catalyzed by nanozymes. It was found that some nanozymes exhibited different enzyme activities at different pH values [70][71][72][73]; for example, if the pH of α-ZrO 2 is lower than 5.3, it shows the catalytic activity of peroxidase, and when the pH is higher than 5.3, it shows the catalytic activity of catalase [71]. Additionally, the temperature factor can also regulate the catalytic efficiency of nanozymes.…”

Section: Ph and Temperaturementioning

confidence: 99%

Progress and Trend on the Regulation Methods for Nanozyme Activity and Its Application

et al. 2019

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Natural enzymes, such as biocatalysts, are widely used in biosensors, medicine and health, the environmental field, and other fields. However, it is easy for natural enzymes to lose catalytic activity due to their intrinsic shortcomings including a high purification cost, insufficient stability, and difficulties of recycling, which limit their practical applications. The unexpected discovery of the Fe3O4 nanozyme in 2007 has given rise to tremendous efforts for developing natural enzyme substitutes. Nanozymes, which are nanomaterials with enzyme-mimetic catalytic activity, can serve as ideal candidates for artificial mimic enzymes. Nanozymes possess superiorities due to their low cost, high stability, and easy preparation. Although great progress has been made in the development of nanozymes, the catalytic efficiency of existing nanozymes is relatively low compared with natural enzymes. It is still a challenging task to develop nanozymes with a precise regulation of catalytic activity. This review summarizes the classification and various strategies for modulating the activity as well as research progress in the different application fields of nanozymes. Typical examples of the recent research process of nanozymes will be presented and critically discussed.

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Section: Ph and Temperaturementioning

confidence: 99%

Progress and Trend on the Regulation Methods for Nanozyme Activity and Its Application

et al. 2019

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“…The improved performance of the chitosan‐functionalized CoFe 2 O 4 nanoparticles may be attributed to the chitosan‐coating providing more monodispersed magnetic nanoparticles and a positive surface charge for affinity to luminol. The group also synthesized mesoporous material‐supported CoFe 2 O 4 NPs, and found that the Al 2 O 3 ‐supported CoFe 2 O 4 NPs that possessed the highest positive charged at given pH value had the highest CL catalytic activity . In addition, the peroxidase‐like activity of gold nanoparticles was also affected by affinity between nanozymes and substrate …”

Section: Introductionmentioning

confidence: 99%

Improvement of mimetic peroxidase activity of gold nanoclusters on the luminol chemiluminescence reaction by surface modification with ethanediamine

2018

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Peroxidase is a commonly used catalyst in luminol-H O chemiluminescence (CL) reactions. Natural peroxidase has a sophisticated separation process, short shelf life and unstable activity, therefore it is important to develop peroxidases that have both high catalytic activity and good stability as alternatives to the natural enzyme. Gold nanoclusters (Au NCs) are an alternative peroxidase with catalytic activity in the luminol-H O CL reaction. In the present study, ethanediamine was modified on the surface of Au NCs forming cationic Au NCs. The zeta potential of the cationic Au NCs maintained its positive charge when the pH of the solution was between 4 and 9. The cationic Au NCs showed higher catalytic activity in the luminol-H O CL reaction than did unmodified Au NCs. A mechanism study showed that the better performance of cationic Au NCs may be attributed to the generation of O on the surface of cationic Au NCs and a positive surface charge, for better affinity to luminol. Cationic Au NC, acting as a peroxidase mimic, has much better stability than horseradish peroxidase over a wide range of temperatures. We believe that cationic Au NCs may be useful as an artificial peroxidase for a wide range of potential applications in CL and bioanalysis.

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“…For instance, Fe 3 O 4 nanoparticles have been widely used experimentally for numerous applications such as separation of biomolecules [1][2][3], drug and gene targeting [4,5], tissue engineering [6], magnetic resonance imaging [7][8][9], magnetic biosensors [10], biocatalysts [11], wastewater treatment [12][13][14][15][16][17] and as mediators of heat for cancer therapy [18,19]. More recently, Fe 3 O 4 nanoparticles have been found surprisingly to possess intrinsic peroxidase-like activity [20][21][22][23][24][25][26]. Peroxidase catalysis owns a wide range of practical applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetically separable and recyclable Fe3O4–polydopamine hybrid hollow microsphere for highly efficient peroxidase mimetic catalysts

Liu

Wang

et al. 2016

Journal of Colloid and Interface Science

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Magnetic Fe3O4-polydopamine (PDA) hybrid hollow microspheres, in which Fe3O4 nanoparticles were firmly incorporated in the cross-linked PDA shell, have been prepared through the formation of core/shell PS/Fe3O4-PDA composites based on template-induced covalent assembly method, followed by core removal in a tetrahydrofuran solution. The morphology, composition, thermal property and magnetic property of the magnetic hybrid hollow microspheres were characterized by SEM, TEM, FT-IR, XRD, TGA, and vibrating sample magnetometer, respectively. Results revealed that the magnetic hybrid hollow microspheres had about 380 nm of inner diameter and about 30 nm of shell thickness, and 13.6 emu g(-1) of magnetization saturation. More importantly, the Fe3O4-PDA hybrid hollow microspheres exhibited intrinsic peroxidase-like activity, as they could quickly catalyze the oxidation of typical substrates 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide. Compared with PDA/Fe3O4 composites where Fe3O4 nanoparticles were loaded on the surface of PDA microspheres, the stability of Fe3O4-PDA hybrid hollow microspheres was greatly improved. As-prepared magnetic hollow microspheres might open up a new application field in biodetection, biocatalysis, and environmental monitoring.

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Mesoporous material-based manipulation of the enzyme-like activity of CoFe2O4 nanoparticles

Cited by 59 publications

References 29 publications

Progress and Trend on the Regulation Methods for Nanozyme Activity and Its Application

Progress and Trend on the Regulation Methods for Nanozyme Activity and Its Application

Improvement of mimetic peroxidase activity of gold nanoclusters on the luminol chemiluminescence reaction by surface modification with ethanediamine

Magnetically separable and recyclable Fe3O4–polydopamine hybrid hollow microsphere for highly efficient peroxidase mimetic catalysts

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