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| 1 | Bivalent Metal Ions Tethered Fluorescent Gold Nanoparticles as a Reusable Peroxidase Mimic Nanozyme显示文摘Nanozymes are a class of mimic enzymes that have both unique properties of nanomaterials and catalytic functions.They are widely used in medicine,food,agriculture,and environment due to their high catalytic efficiency,stability,economy,and large-scale preparation.In this work,a simple,gentle method was applied to synthesize adenosine phosphates(AXP)templated gold nanoparticles(Au NPs)with small size,good optical properties,and peroxidase-like activities.In the presence of hydrogen peroxide(H_(2)O_(2)),the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine(TMB)could be oxidized to form blue-colored oxidized TMB(oxTMB),which demonstrates that the AuAXP NPs have peroxidase-like activities.Inter-estingly,the introduction of bivalent metal ions into AuAXP NPs allows their reusability.Among them,after three rounds of recycling,the catalytic activity of Mg@AuAMP could still reach 92.69%compared to the original level,which showed excellent reusability.In addition,the glutathione(GSH)detection was realized with a linear detection range of 0-200μM due to the GSH-induced loss of peroxidase-like activities.Overall,this work provides a new idea of recycling for biosensor and catalytic analysis. | Liu Liu Hui Jiang Xuemei Wang | 2019 | Journal of Analysis and Testing2019，3，3： | 4 |
| 2 | Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics显示文摘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 andγ-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 83.75μmol·m^−2·s^−1,2.7 and 19.0 times of those ofα-MnO2 andγ-MnO2(30.91 and 4.41μmol·m^−2·s^−1),respectively.The characterization results showed that there were more surface hydroxyls as well as more Mn4+on the surface of theβ-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 ofβ-MnO2 oxidase mimic.Usingβ-MnO2,aβ-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(0.11-45μM)and a low detection limit(0.1μM),and had been successfully applied to GSH quantification in human serum samples. | Yanxia Meng Kunfeng Zhao Zhaokun Zhang Peng Gao Jing Yuan Ting Cai Qin Tong Gang Huang Dannong He | 2020 | Nano Research2020，13，3： | 1 |
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