Aqueous Synthesis of CdTe/CdSe Core/Shell Quantum Dots as pH-Sensitive Fluorescence Probe for the Determination of Ascorbic Acid

By controlling the reflux time and the quantity of the shell materials, different sizes of thioglycollic acid (TGA) modified CdTe/CdSe core/shell quantum dots were synthesized in aqueous solution. This type of QDs was used for sensitive and selective determination of ascorbic acid in commercial tabl...

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Veröffentlicht in:	Journal of fluorescence 2011-05, Vol.21 (3), p.1123-1129
Hauptverfasser:	Yang, Shan-Shan, Ren, Cui-Ling, Zhang, Zhen-Yang, Hao, Jun-Jie, Hu, Qin, Chen, Xing-Guo
Format:	Artikel
Sprache:	eng
Schlagworte:	Analytical Chemistry Ascorbic acid Ascorbic Acid - analysis Biochemistry Biological and Medical Physics Biomedical and Life Sciences Biomedicine Biophysics Biotechnology Cadmium Compounds Cadmium selenides Cadmium tellurides Fluorescence Fluorescent Dyes - chemistry Hydrogen-Ion Concentration Molecular Probe Techniques Original Paper Quantum Dots Selenium Compounds Shells Tablets Tellurium Vitamin C
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Beschreibung
Zusammenfassung:	By controlling the reflux time and the quantity of the shell materials, different sizes of thioglycollic acid (TGA) modified CdTe/CdSe core/shell quantum dots were synthesized in aqueous solution. This type of QDs was used for sensitive and selective determination of ascorbic acid in commercial tablets. Under optimal conditions, a good linearity was observed between the relative fluorescence (FL) intensity and the concentration of ascorbic acid in the range of 4.0 to 64.0 μg/mL with a correlation coefficient of 0.9968. The limit of detection was 2.4 μg/mL. This method was applied to the determination of the ascorbic acid in Vitamin C tablets and Vitamin C Yinqiao pills, and satisfactory results were obtained.
ISSN:	1053-0509 1573-4994
DOI:	10.1007/s10895-010-0788-9