Ultrasensitive Fluorescence Detection of Ascorbic Acid Using Silver Ion-Modulated High-Quality CdSe/CdS/ZnS Quantum Dots.

ABSTRACT: Improving the sensitivity of the fluorescence method for the detection of bioactive molecules is crucial in biochemical analysis. In this work, an ultrasensitive sensing strategy was constructed for the detection of ascorbic acid (AA) using high-quality 3-mercaptopropionic acid-capped CdSe/CdS/ZnS quantum dots (MPA-CdSe/CdS/ZnS QDs) as the fluorescent probe. The prepared water-soluble QDs exhibited a high photoluminescence quantum yield (PL QY) of up to 96%. Further, the fluorescence intensity of the QDs was intensively quenched through the dynamic quenching of Ag⁺ ions due to an efficient photoinduced electron transfer progress. While the existence of AA before adding Ag⁺ ions, Ag⁺ ions were reduced. Thus, the interaction of the QDs and Ag⁺ ions

SUBMITTER: Lu X 

PROVIDER: S-EPMC11209877 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature