期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 321, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128511
关键词
Cupric oxide; Nanozyme; Tandem catalysis; Fluorescent sensor; Alkaline phosphatase
资金
- National Natural Science Foundation of China [21175023, 21675024]
- Program for Innovative Leading Talents in Fujian Province [2016B016]
- Program for Innovative Research Team in Science and Technology in Fujian Province University [2018B033]
- Startup Fund for Scientific Research, Fujian Medical University [2017XQ1064]
- Program for Health Scientific Talents in Fujian Province [2018-1-53]
During the past decades, most reported nanozymes have been confined to limited species of enzyme-like activities and only few examples were reported to mimic tandem enzyme-like activities. To fill gaps in expanding the species and improving catalytic efficiency of nanozymes, exploring nanozymes as tandem nanozymes has turned out to be an effective method. Herein, we have presented the cupric oxide nanoparticles (CuO NPs) as tandem nanozymes, which is expected to simultaneously catalyze the cascade reaction coupling ascorbate oxidase with peroxidase like activities at temperature (45 degrees C) and neutral pH (pH= 7). This one-pot cascade reaction system included the oxidation of ascorbic acid (AA) to yield H2O2 and terephthalic acid (TA) oxidation reaction mediated by H2O2 to generate a fluorescence product (lambda(ex)= 315 nm, lambda(em)=422 nm). More significantly, fluorescent sensors are respectively fabricated for AA, alkaline phosphatase (ALP) and L-phenylalanine (ALP inhibitor) detection coupling the catalysis of CuO tandem nanozymes with ALP enzymatic reaction. Base on these findings, this work shows high selectivity/sensitivity and low limit of detection (2.92 x 10(-8) M for AA, 0.058 U/L for ALP) properly due to an in-situ reaction. CuO tandem nanozymes expand the species of nanozymes and these CuO tandem nanozymes based fluorescent sensors can be applied for one-pot nonenzymatic biomolecular sensing in clinical diagnostics, biological or pharmaceutical analysis.
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