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Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics

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  • 地址:

    [1]Univ Shanghai Sci & Technol, Sch Med Instrument & Food Engn, 516 Jungong Rd, Shanghai 200093, Peoples R China.

    [2]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China.

    [3]Natl Engn Res Ctr Nanotechnol, 28 East Jiangchuan Rd, Shanghai 200241, Peoples R China.

    [4]Shanghai Univ Med & Hlth Sci, 279 Zhouzhu Rd, Shanghai 201318, Peoples R China.

    [5]Ningbo Fundenergy Co Ltd, 699 Haicheng Rd, Ningbo 315200, Peoples R China.

  • 语种:
    英文
  • 期刊:
    NANO RESEARCH ISSN:1998-0124 2020 年
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  • 摘要:

    The crystal structures would directly affect the physical and chemical properties of the surface of the material, and would thus influence the catalytic activity of the material. alpha-MnO2, beta-MnO2 and gamma-MnO2 nanorods with the same morphology yet different crystal structures were prepared and tested as oxidase mimics using 3,3',5,5'-tetramethylbenzidine (TMB) as the substrate. beta-MnO2 that exhibited the highest activity had a catalytic constant of 83.75 mu mol center dot m(-2)center dot s(-1), 2.7 and 19.0 times of those of alpha-MnO2 and gamma-MnO2 (30.91 and 4.41 mu mol center dot m(-2)center dot s(-1)), respectively. The characterization results showed that there were more surface hydroxyls as well as more Mn4+ on the surface of the beta-MnO2 nanorods. The surface hydroxyls were conducive to the oxidation reaction, while Mn4+ was conducive to the regeneration of surface hydroxyls. The synergistic effect of the two factors significantly improved the activity of beta-MnO2 oxidase mimic. Using beta-MnO2, a beta-MnO2-TMB-GSH system was established to detect the content of glutathione (GSH) rapidly and sensitively by colorimetry. This method had a wide detection range (0.11-45 mu M) and a low detection limit (0.1 mu M), and had been successfully applied to GSH quantification in human serum samples.

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  • 基金信息:
    National Key R&D Program of China [2016YFA0202900]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2018M642021]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China [21677095]; Minhang District Science and Technology Project of Shanghai [2019MH-MS02]
  • 推荐引用方式
    GB/T 7714:
    Meng Yanxia,Zhao Kunfeng,Zhang Zhaokun, et al. Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics [J].NANO RESEARCH,2020.
  • APA:
    Meng Yanxia,Zhao Kunfeng,Zhang Zhaokun,Gao Peng,&He Dannong.(2020).Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics .NANO RESEARCH.
  • MLA:
    Meng Yanxia, et al. "Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics" .NANO RESEARCH(2020).
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