Abstract
Ascorbic acid (AA) is involved in many important biological processes in the body whose determination is of great value for the diagnosis and treatment of diseases. We constructed a novel ratiometric fluorescence sensor for specific recognition and sensitive ratiometric determination of AA. In this sensor, CdTeS quantum dots coated silica shell (CdTeS QDs@SiO2) to act as a reference and offer a built-in correction for environmental factors. ZnCdS quantum dots were encapsulated in a three-dimensional network imprinted polymer (ZnCdS QDs@MIP) to provide response signal. The fluorescence emission of ZnCdS QDs@MIP was selectively quenched in the presence of AA, and a good linear model was fitted based on the fluorescence intensity ratios of ZnCdS QDs@MIP and CdTeS QDs@SiO2 (F530/F705) and the concentrations of AA in the range of 1–500 μM with a detection limit of 0.78 μM. The reliability of the proposed sensor in the real samples analysis was investigated through the detection of AA in vitamin C tablets and satisfactory results were obtained.
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