期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 319, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128273
关键词
Cr(III); Cu-based carbon dots; Fenton reaction; o-phenylenediamine; peroxidase-like activity; inhibition
资金
- Analysis and Testing Foundation of Kunming University of Science and Technology [2019P20173118001]
- Kunming University of Science and Technology
- Yunnan Province PhD Academic Newcomer Fund
The construction of highly efficient nanozyme activities in a simple means is vital for the wide biological and chemical applications. Present work describes a Cu-based carbon dots (Cu-CDs) with oxidase- and peroxidase-like activity for the catalytic oxidation of o-phenylenediamine (OPD) at neutral pH. The peroxidase-like activity of Cu-CDs was finely tuned and enhanced by changing the ascorbic acid (AA) content and reduction temperature to increase the Cu+ content. The oxidation of OPD was significantly accelerated by the addition of Fe2+ ions (i.e., Cu-CDs + Fe2+/H2O2 system) and presented a smaller K-m (Michaelis constant) and a higher V-max (maximum rate) than horseradish peroxidase (HRP) at the same mass concentration. The Cu-CDs with oxidase- and peroxidase-like activities could catalyze to produce the superoxide radical (center dot O-2(-)) and hydroxyl radical (center dot OH) in the system. Interestingly, the catalytic oxidation of OPD to 2,3-diaminophenazine (DAP) could be inhibited by Cr(III) ions in Cu-CDs + Fe2+/H2O2 system. Therefore, a new fluorescent detection strategy was developed for the detection of Cr(III) with the linear range of 0.2-100 mu M, and the detection limit of 36 nM (S/N = 3). This work provides new insight into the mechanism and kinetics of low-valence copper-carbon dots peroxidase-like and Fenton co-catalyst system.
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