title: Aqueous synthesis of CdTe/CdSe core/shell quantum dots as pH-sensitive fluorescence probe for the determination of ascorbic acid.
abstract: 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.
authors.affiliation: National Key Laboratory of Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Yang
authors.forename: Cui-Ling
authors.initials: CL
authors.lastname: Ren
authors.forename: Zhen-Yang
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Hao
authors.forename: Qin
authors.initials: Q
authors.lastname: Hu
authors.forename: Xing-Guo
authors.initials: XG
authors.lastname: Chen
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis*; D019187:Cadmium Compounds; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D015336:Molecular Probe Techniques; D045663:Quantum Dots; D018036:Selenium Compounds; D013691:Tellurium
chemical_list: D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D018036:Selenium Compounds; C058667:cadmium selenide; D013691:Tellurium; D001205:Ascorbic Acid; C028337:cadmium telluride