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Effects of crystal structure on the activity of MnO<inf>2</inf> nanorods oxidase mimics

  • 作者:
    Meng, Yanxia[1][4];Zhao, Kunfeng[2][3][4];Zhang, Zhaokun[1][4];Gao, Peng[5];Yuan, Jing[3];Cai, Ting[3];Tong, Qin[3];Huang, Gang[4];He, Dannong[2][4];
  • 地址:
    School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, 200093, China[1];School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China[2];National Engineering Research Center for Nanotechnology, 28 East Jiangchuan Road, Shanghai, 200241, China[3];Shanghai University of Medicine and Health Sciences, 279 Zhouzhu Road, Shanghai, 201318, China[4];Ningbo Fundenergy Co., Ltd., 699 Haicheng Road, Ningbo, 315200, China[5];
  • 语种:
    英文
  • 期刊:
    Nano Research ISSN:1998-0124 2020 年
  • 收录:
  • 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. α-MnO2, β-MnO2 and γ-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. β-MnO2 that exhibited the highest activity had a catalytic constant of 83.75 μmol·m?2·s?1, 2.7 and 19.0 times of those of α-MnO2 and γ-MnO2 (30.91 and 4.41 μmol·m?2·s?1), respectively. The characterization results showed that there were more surface hydroxyls as well as more Mn4+ on the surface of the β-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 β-MnO2 oxidase mimic. Using β-MnO2, a β-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 μM) and a low detection limit (0.1 μM), and had been successfully applied to GSH quantification in human serum samples. [Figure not available: see fulltext.]. ? 2020, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.

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  • 推荐引用方式
    GB/T 7714:
    Meng Yanxia[1][4],Zhao Kunfeng[2][3][4],Zhang Zhaokun[1][4], et al. Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics [J].Nano Research,2020.
  • APA:
    Meng Yanxia[1][4],Zhao Kunfeng[2][3][4],Zhang Zhaokun[1][4],Gao Peng[5],&He Dannong[2][4].(2020).Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics .Nano Research.
  • MLA:
    Meng Yanxia[1][4], et al. "Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics" .Nano Research(2020).
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