https://scholars.lib.ntu.edu.tw/handle/123456789/626338
標題: | Ratiometric Fluorescence Probe of Vesicle-like Carbon Dots and Gold Clusters for Quantitation of Cholesterol | 作者: | Hu S.-R Yang C.-R Huang Y.-F Huang C.-C Chen Y.-L HUAN-TSUNG CHANG |
關鍵字: | cholesterol; gold nanoclusters; ratiometric fluorescence probe; vesicle-like carbon dots | 公開日期: | 2022 | 卷: | 10 | 期: | 5 | 來源出版物: | Chemosensors | 摘要: | We report a facile method for the preparation of vesicle-like carbon dots (VCDs) via dry-heating of surfactant solutions. Like most reported CDs, the VCDs possess interesting fluorescence properties. Entrapment of enzymes and gold nanoclusters (AuNCs) inside the VCDs allows for the development of fluorescent probes for the quantitation of various substrates, with the advantages of high sensitivity and selectivity. The AuNCs act as a probe, and the VCDs as an internal standard confine the AuNCs, enzyme, and analyte to provide high local concentrations to enhance the assay sensitivity. In this study, we employed cholesterol oxidase (ChOX) as a model enzyme for the quantitation of cholesterol. The as-formed hydrogen peroxide through the enzyme reaction inside the VCDs causes fluorescence quenching of AuNCs (excitation/emission wavelengths of 320/670 nm), but not that of the VCDs (excitation/emission wavelengths of 320/400 nm). To improve the sensitivity and linearity, the fluorescence ratios of AuNCs/VCDs are plotted against analyte concentration. The present ratiometric fluorescent method allows for the detection of hydrogen peroxide over the concentration range of 1–100 µM, with a detection limit of 0.673 µM, and cholesterol concentrations ranging from 5 to 100 µM, with a detection limit of 2.8 µM. The practicality of this fluorescent method has been further validated by evaluating cholesterol levels in human serum samples with sufficient accuracy and recovery, revealing its great prospective in diagnosis and biomedical applications. © 2022 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85129702456&doi=10.3390%2fchemosensors10050160&partnerID=40&md5=c91d4f316f300454c0c4719190f5425f https://scholars.lib.ntu.edu.tw/handle/123456789/626338 |
ISSN: | 22279040 | DOI: | 10.3390/chemosensors10050160 |
顯示於: | 化學系 |
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