Polyvinylpyrrolidone-stabilized Pt nanoclusters as robust oxidase mimics for selective detection of ascorbic acid

被引：33
作者：
Liu, Xueliang [1 ]
Tian, Miaomiao [1 ]
Li, Chunyang [1 ]
Tian, Fengshou [1 ]
机构：
[1] Zhoukou Normal Univ, Int Joint Res Lab Biomed Nanomat Henan, Key Lab Rare Earth Funct Mat & Applicat, Zhoukou 466001, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2021年 / 625卷
关键词：
Pt nanoclusters; Nanozyme; Fluorescence method; Ascorbic acid; SENSITIVE COLORIMETRIC DETECTION; PLATINUM NANOPARTICLES; VITAMIN-C; FLUORESCENCE; NANOCOMPOSITES; OXIDATION; CATALYSTS; COBALT;
D O I：
10.1016/j.colsurfa.2021.126985
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, the Pt nanoclusters with an average size of 1.7 +/- 0.3 nm were prepared by a facile and green method using polyvinylpyrrolidone (PVP) as both stabilizer and reductant. The oxidase-like activity of PVPstabilized Pt nanoclusters (PVP-Pt NCs) was investigated by the catalytic oxidation of o-phenylenediamine (OPD). The mechanism studies indicated that PVP-Pt NCs performed as oxidase enzyme mimics by catalyzing the dissolved oxygen to generate the reactive oxygen species (singlet oxygen and superoxide anion) intermediates. Ascorbic acid (AA) could also be oxidized to dehydroascorbic acid (DHA) which could react with OPD to generate a fluorescent compound. On the basis of the robust oxidase-like activity of PVP-Pt NCs, both colorimetric assay and fluorescence method for AA determination were established. Compared with colorimetric assay, the fluorescence method showed higher sensitivity and selectivity for AA detection. The proposed fluorescence method with the LOD of 1.17 mu M could overcome the interference of most reducing substances and showed promising applications in biosensor.
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