期刊
ANALYTICAL CHEMISTRY
卷 90, 期 18, 页码 11146-11153出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b03211
关键词
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资金
- national natural science foundation of China (NSFC) [21522502]
- Fundamental Research Funds for the Central Universities
- Excellent Youth Scholars of Hunan Provincial Education Department [17B155]
- Opening Fund of Key Laboratory of Chemical Biology and Tradition Chinese Medicine Research (Ministry of Education of China), Hunan Normal University
In this work, we demonstrate a convenient yet sensitive color coded single-particle detection method for the quantification of pyrophosphate (PPi) by using single gold nanoparticle (GNP) as the probe. The design is based on GNP-dependent catalytic deposition of Cu onto the surface of GNPs with reduced nicotinamide adenine dinucleotide (NADH). Without PPi, Cu2+ can be directly reduced to Cu through the gold-catalyzed oxidization of NADH. In the presence of PPi, the coating process is impeded due to the strong coordination capability of PPi with Cu2+. The selective coating of Cu shell onto the GNPs surface results in the extraordinary red-shift of localized surface plasmon resonance from individual GNPs. By quantitatively counting the fraction of yellow particles with color-coded dark-field optical microscopy, the trace amounts of PPi in solution can be accurately quantified. The limit-of-detection is as low as 1.49 nM with a linear dynamic range of 0-4.29 mu M, which is much lower than the spectroscopic measurements in bulk solution. sample, good recovery efficiency was achieved. As a consequence, the method demonstrated herein will find promising applications for the ultrasensitive detection of target biomolecules under biological milieu in the future. In artificial urine
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